This chapter describes those maneuvers and procedures that are essential for maintaining maintenance aircrew skills. Tasks will be performed for both training and evaluation. They will only be performed when a qualified and current MP/ME is occupying a crew station. If discrepancies are found between this chapter and TM 55-1520-236-MTF or TM 55-1520-244-MTF, the technical manual takes precedence.
a. Task Number and Title. Each task is identified by a number and a title which correspond to those for the tasks listed in Chapter 5 (Figure 5-3).
b. Conditions. The conditions specify the situation in which the task is to be performed. They describe the important aspects of the performance environment. All conditions must be met before task iterations can be credited.
c. Standards. The standards describe the minimum degree of proficiency or standard of performance to which the task must be accomplished.
d. Description. The description explains how the task should be accomplished to meet the standards. It includes individual and crew-coordinated actions that are to be performed as indicated by the MP (maintenance test pilot), ME (maintenance test flight evaluator), P* (pilot on the controls), P (pilot not on the controls), PC (pilot in command), PLT (pilot), and CE (crew chief). During maintenance test flights, the MP will be the PC. Unless otherwise noted, the MP will perform P* duties from the pilot station.
e. References. The references listed for each task are sources of information about that particular task.
a. Individual Actions. These actions are the portions of a crew task that an individual must accomplish.
b. Crew-Coordinated Actions. These portions of a task require the interaction of the entire crew to ensure safe, efficient, and effective task execution.
TASK: Perform prior-to-maintenance-test-flight checks.
CONDITIONS: In an AH-1 helicopter and given TM 55-1520-234-CL or TM 55-1520-236-CL and DA Form 2408-12 (Army Aviator's Flight Record) and DA Form 2408-13 (Aircraft Status Information Record).
STANDARDS:
1. Without error, perform the preflight inspection according to TM 55-1520-234-CL or TM 55-1520-236-CL.
2. Correctly enter appropriate information on DA Forms 2408-12 and 2408-13.
3. Correctly determine the suitability of the aircraft for flight.
4. Correctly determine the maneuvers, checks, and tasks required during the test flight.
5. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The PC will ensure that the preflight inspection is conducted according to TM 55-1520-234-CL or TM 55-1520-236-CL. He may direct that the other crew member(s) inspect all or designated sections of the aircraft. The PC will verify that all preflight checks have been completed. He will ensure that the appropriate information has been entered on DA Forms 2408-12 and 2408-13.
2. The other crew member(s) will complete the preflight inspection as directed. They will inform the PC whether the aircraft or assigned sections meet required preflight inspection criteria.
3. The PC will determine the maneuvers or checks necessary for the maintenance test flight. The crew will use additional publications and references as necessary. The PC will brief the aircrew and any supporting ground crew concerning operations around or on the aircraft. He will ensure that the ground communications capability is adequate. The PC will stress any safety considerations or procedures applicable to the flight.
4. The PC will ensure that a walk-around inspection is completed prior to flight.
REFERENCES:
Aircraft logbook
TM 55-1520-236-23 series
TASK: Perform interior checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Each crew member will announce when his checks are completed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform before-starting-engine checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CLor TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The type of test flight to be performed (general or limited) will determine what specific checks will be required. At a minimum, crew members will perform all checks required for flight according to TM 55-1520-234-10 or TM 55-1520-236-10 or TM 55-1520-234-CL or TM 55-1520-236-CL.
2. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
3. The aircrew and, if available, the ground crew will announce when their checks are completed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform starting engine checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The PC will brief the other crew member(s) on their duties in completing the task. He may assign individual crew duties on the basis of pilot preference, engine maintenance required, and crew experience. In his briefing, the PC will include crew duties in an emergency. Crew member(s) will complete the task by accomplishing all requirements in TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
3. The P* will announce initiation of the engine start.
4. The aircrew and, if available, the ground crew will clear the area around the aircraft prior to engine start.
REFERENCES:
TM 1-1500-328-23
TM
55-1520-234-23-1
TM
55-1520-234-23-2
TM 55-1520-234-CL
TM 55-1520-236-23 series
TM 55-1520-236-CL
TM
55-1520-236-MTF
TM
55-1520-244-MTF
TASK: Perform engine run-up checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-234-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The type of test flight to be performed (general or limited) will determine what specific checks will be required. At a minimum, crew members will perform all checks required for flight according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
3. The aircrew and, if available, the ground crew will announce when their checks are completed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform baseline and normal engine health indicator test.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-236-MTF or TM 55-1520-244-MTF and TMs 55-2840-229-23-1 and 55-2840-229-23-2.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-236-MTF or TM 55-1520-244-MTF and TMs 55-2840-229-23-1 and 55-2840-229-23-2.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly complete the HIT baseline work sheet.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The PC will brief the P or CE on their duties in performing the task. The P* will position the helicopter heading into the wind. The aircrew will perform the procedure according to TM 55-1520-236-MTF or TM 55-1520-244-MTF and TMs 55-2840-229-23-1 and 55-2840-229-23-2.
2. The P or CE will record the aircraft hours, FAT, and indicated EGT/TGT for the appropriate gas turbine speed. The P* will then compute the difference between the current EGT/TGT reading and the baseline reading and record it on the engine HIT log.
REFERENCES:
Engine HIT log
TASK: Perform before-takeoff check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MFT or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly use the call and response method.
3. Correctly check and perform all items in sequence.
4. Correctly determine any malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station. The PC will ensure that the before-takeoff checks are completed according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. The P* will direct the P or CE to call out the before-takeoff checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
3. The P or CE will call out the before-takeoff checks when directed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform takeoff-to-hover check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-236-MTF or TM 55-1520-244-MTF with the before-takeoff check completed.
STANDARDS:
1. Properly clear the aircraft.
2. Determine proper cyclic, collective, and pedal control responses.
3. Establish a 3-foot hover, ±1 foot.
4. Determine the proper center of gravity.
5. Determine proper droop cam operation.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Ensure that the torque does not exceed the validation factor.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will announce his intent to bring the aircraft to a hover.
3. With the collective fully down, the P* will place the cyclic in the neutral position. He will increase the collective with a smooth, positive pressure. The P* will apply pressure to the pedals to maintain heading and coordinate the cyclic for a vertical ascent. He will note that the apparent center of gravity is normal and that no excessive control displacement is required during the ascent. The P* will adjust the collective to maintain the desired altitude and check that N2 remains at 6600 RPM, ±40 RPM (AH-1S), or at 100 percent, ±0.6 percent (AH-1E, AH-1F, or AH-1P), of the flat pitch RPM. With the aircraft hovering into the wind, the P* will ensure that the cyclic is nearly centered and that the pedal position is normal.
4. The P or CE will remain focused primarily inside the cockpit. He will assist the P* by monitoring the systems and flight instruments. When the aircraft is clear of the parking area, the P or CE will check the area for indications of fuel or oil leaks.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform torquemeter/power check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS with the hover power check completed and performance planning data available.
STANDARDS:
1. Correctly compute a 5-foot hover torque based on actual conditions.
2. Properly clear the aircraft.
3. Maintain aircraft heading into the wind.
4. Maintain a stabilized 5-foot hover, ±1 foot.
5. Correctly note torque indication.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will record indicated torque from the backseat.
3. The P* will increase the collective and bring the aircraft to a stabilized 5-foot hover into the wind. He will note the torque indication and compare it with the computed torque value. The MP will analyze and resolve any difference in the torque values.
NOTE: The actual torque requirement should be determined by using actual FAT and PA indicated at a setting of 29.92 and the actual aircraft weight at the time of the check. The actual torque should be within 4 percent or 2 psi of the computed torque value. Wind in excess of 10 knots may affect the torque required to hover.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform pedal authority check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a stabilized 3-foot hover, ±1 foot.
4. Correctly perform 90-degree hovering turns to the left and right of the wind direction, not to exceed 90 degrees of turn in four seconds.
5. Correctly determine aircraft controllability and tail rotor response.
6. Correctly determine that flight instrument response is normal.
7. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
3. The P* will apply pressure on the desired pedal to begin the turn. Using pressure and counterpressure on both pedals to maintain a constant rate of turn, he will note that excessive pedal pressures are not required and that the pedal positions are normal.
4. The P* will make left and right hovering turns 90 degrees to each side of the wind direction. He will check that the turn and slip indicator and compasses respond normally.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform yaw channel response.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Maintain a stabilized 3-foot hover, ±1 foot.
2. Properly clear the aircraft.
3. Maintain aircraft heading into the wind.
4. Establish a slight vertical ascent.
5. Correctly determine if the SCAS maintains the original heading.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION: The P* will maintain the aircraft heading into the prevailing wind. He will increase the collective slightly without moving the pedals, noting that the SCAS maintains the aircraft aircraft close to the original heading. The P will assist in clearing the aircraft and will provide adequate warning of obstacles, excessive drift, or excessive altitude changes.
NOTE: If yaw channel SCAS function is questionable, disengage the yaw channel of the SCAS and repeat the check for comparison.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform sideward hovering flight.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a stabilized 3-foot hover, ±1 foot.
4. Maintain aircraft heading into the wind and the flight path perpendicular to the wind direction.
5. Correctly determine aircraft controllability and tail rotor response.
6. Maintain hover speed consistent with autorotational capabilities.
7. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
3. The P* will apply cyclic in the desired direction of flight, noting that no excessive inputs are required. After the p* neutralizes the cyclic, the aircraft should coast to a stabilized hover.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform forward hovering flight.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a stabilized 3-foot hover, ±1 foot.
4. Maintain aircraft heading into the wind, ±10 degrees.
5. Correctly determine aircraft controllability and tail rotor response.
6. Correctly accelerate forward to ETL.
7. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
3. The P* will apply sufficient forward cyclic to accelerate to ETL. He will note that no excessive control inputs are required, that vibration levels and instrument responses are normal, and that the aircraft responds normally. The P* will apply aft cyclic and note that the aircraft returns to normal hovering flight.
NOTE: The P* will maintain tail rotor altitude during the deceleration.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform pylon mounts check (SCAS on and SCAS off).
CONDITIONS: In an AH-1 helicopter and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a stabilized 5-foot hover, ±1 foot.
4. Maintain aircraft heading into the wind, ±10 degrees.
5. Correctly induce pylon rock (SCAS on and SCAS off).
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
3. The P* will move the cyclic fore and aft, not to exceed 3 to 4 inches, at a rate sufficient to induce pylon rock. He will then neutralize the cyclic and record the number of cycles (beats) required to dampen pylon rock. The P* will note that no abnormal vibrations or engine surges occur.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform engine response check.
CONDITIONS: In an AH-1 helicopter and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Initiate the check from a 3-foot hover, ±1 foot.
4. Ensure that the ECU and deice switches are off.
5. Correctly determine engine response without exceeding limitations.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. All crew members will clear the area around the aircraft.
2. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
3. The P* will positively apply sufficient collective pitch to cause the N2 to decrease. The engine should respond smoothly and rapidly, and the N2 should initially decrease. (No stalls should occur.) The N2 must recover prior to the P* 's reducing the collective. The P* should not exceed an altitude of 50 feet AGL.
4. The P or CE will advise the P* if N2 droop occurs. The P or CE also will assist in ensuring that airframe and engine limitations are not exceeded.
NOTE: A well-rigged droop cam, an overspeed governor, and fuel control may keep the N2 stable. The gross weight of the aircraft should not be light for this check.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform low RPM hover check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS; and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a stabilized 3-foot hover, ±1 foot.
4. Establish aircraft heading into the wind.
5. Correctly perform 45-degree hovering turns to the left and right of the initial heading.
6. Correctly determine aircraft controllability and tail rotor response.
7. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. Crew Actions.
a. All crew members will clear the area around the aircraft.
b. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
2. Procedure. With the aircraft stabilized at a 3-foot hover, the P* will slowly decrease N2 to 6000 RPM (AH-1S) or 91 percent (AH-1E, AH-1F, or AH-1P) with the governor increase/decrease switch. If aircraft controllability or control reponses become abnormal during the RPM reduction, the P* will terminate the maneuver and check the static control rigging. He will check antitorque controllability by executing 45-degree hovering turns to the left and right of the initial heading. With the aircraft stabilized at a 3-foot hover and N2 at 6000 RPM or 91 percent, the P* will check for excessive lateral vibrations. He will then increase the N2 to 6600 RPM or 100 percent using the governor increase/decrease switch while maintaining a 3-foot hover.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform manual throttle operation, emergency governor mode.
CONDITIONS: In an AH-1 helicopter or an AH1FWS, with the aircraft on a level surface heading into the wind, and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Without error, perform the procedure to change the governor to the emergency mode according to the description below.
4. Maintain aircraft heading into the wind, ±10 degrees.
5. Maintain N2 at 6400 RPM, ±300 RPM, or 97 percent, ±3 percent.
6. Establish a 3-foot hover, ±1 foot.
7. Correctly note engine performance throughout the maneuver.
8. Correctly return the governor to the automatic mode.
9. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
10. Correctly perform crew coordination actions.
|
CAUTION To prevent an overspeed, overtemperature, compressor stall, or engine failure, make smooth throttle and collective adjustments. Closely monitor N1, N2, and EGT/TGT. |
1. Crew Actions.
a. All crew members will clear the area around the aircraft.
b. The P* will remain focused primarily outside the aircraft. The P or CE will assist him by monitoring the aircraft systems and flight instruments. The P or CE also will assist with obstacle avoidance and will perform other duties directed by the P*.
|
CAUTION The P* must be prepared to place his governor switch to the emergency position if the P or CE does not quickly return his switch to the automatic position. |
2. Procedure. With the aircraft on the ground, the N2 stabilized at 6600 RPM or 100 percent, and the collective fully down, the P* will retard the throttle to engine idle stop. After the engine stabilizes at engine idle RPM, the P* will move the governor control switch to the emergency position and note a decrease in engine RPM and appropriate caution light illumination. He will adjust the throttle to 6400 RPM or 97 percent and bring the aircraft to a stabilized 3-foot hover by smoothly increasing the collective and adjusting the throttle to maintain 6400 RPM or 97 percent. The P* will apply cyclic and pedals as necessary to maintain a stationary hover and a constant heading. Upon completion of the hover, the P* will land the aircraft by smoothly reducing the collective and adjusting the throttle to maintain 6400 RPM or 97 percent. After landing, he will reduce the throttle to engine idle stop. After noting a decrease in the engine RPM, the P* will move the governor control switch to the automatic position and verify that the N1 stabilizes at engine idle RPM. The MP will direct the P or CE to identify the governor switch and place it in the emergency position. After noting a slight decrease in N1, the P or CE will immediately return the switch to the automatic-position. The P* will increase the throttle to the fully open position and verify normal engine RPM.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform power cylinder check (dual-and single-system operations).
CONDITIONS: In an AH-1 helicopter, with a qualified and current MP in the backseat and a qualified and current pilot in the front seat who is properly briefed, and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Maintain a 15-foot hover, ±5 feet.
4. Maintain aircraft heading into the wind, ±10 degrees.
5. Maintain position over the starting point with drift not to exceed 10 feet.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. Crew Actions.
a. All crew members will clear the area around the aircraft.
b. The P* will remain focused primarily outside the aircraft and will place the aircraft in a stabilized 15-foot hover. He will then transfer control of the collective and throttle to the P. The P will assist in maintaining a stabilized 15-foot hover and in monitoring the aircraft systems and flight instruments. He also will assist with obstacle avoidance and will perform other duties directed by the P*.
NOTE: Immediately prior to performing this task, the P* will brief the P on the emergency procedure should the flight controls jam or become abnormally stiff.
2. Procedures.
a. Dual-svstem operation. The P* will establish a 15-foot hover and transfer control of the collective and throttle to the P. The P* will move the cyclic smoothly and progressively 6 to 8 inches fore and aft. He will note normal unrestricted operation of the controls and then stabilize the aircraft. The P* will then smoothly move the cyclic laterally through 6 to 8 inches, note normal unrestricted operation of the controls, and stabilize the aircraft.
NOTE: If the controls jam or become abnormally stiff, the P* will immediately recycle the hydraulic control switch to the opposite position and back to BOTH. The MP will then land the aircraft and investigate the problem.
b. Single-system operation.
(1) The P* will establish a 15-foot hover and transfer control of the collective and throttle to the P. He will place the hydraulic control switch in the number 1 system test position. The P* will note illumination of the master caution and HYD pressure number 2 caution segment lights and stabilize the aircraft. He will move the cyclic smoothly and progressively 6 to 8 inches fore and aft. The P* will note normal unrestricted operation of the controls and then stabilize the aircraft. He will then smoothly move the cyclic laterally through 6 to 8 inches, note normal unrestricted operation of the controls, and stabilize the aircraft.
(2) The P* will place the hydraulic control switch in the number 2 system test position. He will note illumination of the master caution and HYD pressure number 1 caution segment lights and stabilize the aircraft. The P* will move the cyclic smoothly and progressively 6 to 8 inches fore and aft. He will note normal unrestricted operation of the controls and then stabilize the aircraft. The P* will then smoothly move the cyclic laterally through 6 to 8 inches, note normal unrestricted operation of the controls, and stabilize the aircraft.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform collective servo authority check (dual-and single-system operations).
CONDITIONS: In an AH-1 helicopter, with a qualified and current MP in the backseat and a qualified and current pilot in the front seat who is properly briefed, and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Properly clear the aircraft.
3. Initiate the check from a 5-foot hover, ±1 foot.
4. Maintain aircraft heading into the wind, ±10 degrees.
5. Maintain position over the starting point with drift not to exceed 10 feet.
6. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. Crew Actions. All crew members will clear the area around the aircraft.
2. Procedures.
a. Dual-system operation. The MP will transfer the flight controls to the PLT. The PLT (the P*) will remain focused primarily outside the aircraft and will place the aircraft in a stabilized 5-foot hover. He will smoothly increase the collective to 85 percent or 48 psi torque and note the amount of force required. The P* will then return the aircraft to a stabilized 5-foot hover. The MP will assist with clearing the aircraft and with monitoring the aircraft systems and flight instruments. He also will assist with obstacle avoidance.
NOTE: Immediately prior to performing this task, the MP will brief the P* on the emergency procedure for collective lock-up or control limitation.
b. Single-system operation.
(1) The MP will place the HYD test switch to the number 1 position, noting illumination of the master caution and number 2 HYD pressure segment lights. The P* will smoothly increase the collective to 85 percent or 48 psi torque or control limitation, whichever is less. The MP will note the torque value attained. The P* will relax pressure on the controls and stabilize the aircraft at a 5-foot hover while the MP returns the HYD test switch to BOTH. If in an AH-1E or AH-1F, the P* will land the aircraft and the MP will reengage the SCAS. If in an AH-1P or AH-1S, the P* will return the aircraft to a 5-foot hover.
(2) The MP will place the HYD test switch to the number 2 position, noting illumination of the master caution and number 1 HYD pressure segment lights. The P* will smoothly increase the collective to obtain 85 percent or 48 psi torque or control limitation, whichever is less. The MP will note the torque value attained. The P* will relax pressure on the controls and stabilize the aircraft at a 5-foot hover while the MP returns the HYD test switch to BOTH. If in an AH-1E or AH-1F, the P* will land the aircraft and the MP will reengage the SCAS. If in an AH-1P or AH-1S, the P* will return the aircraft to a 5-foot hover.
NOTE: If collective lockup or control limitation occurs, the MP will immediately recycle the hydraulic control switch to BOTH. The P* will then land the aircraft, and the MP will investigate the problem.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform takeoff and climb-out checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly complete the before-takeoff check.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION: The P* will perform a normal takeoff and climb out to the initial test altitude. He will note normal aircraft response, vibration levels, vibration entry airspeeds, and instrument operations. The P will assist the P* in clearing the aircraft and will perform other duties directed by the P*.
NOTE: A normal takeoff is recommended for this task, because it provides the most desirable flight profile in case of an emergency.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform instrument operation and correlation check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will vary airspeed and altitude as necessary to check the performance of installed instruments. He will ensure that the backseat instruments correlate properly with the frontseat instruments. The P will verify front-seat instrument readings.
2. Each crew member will announce when his checks are completed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform control rigging checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Maintain minimum safe altitude.
2. Maintain 100 KIAS, ±5 KIAS.
3. Maintain torque at 45 percent (AH-1E, AH-1F, or AH-1P), or 25 psi (AH-1S).
4. Maintain the aircraft in trim.
5. Correctly note cyclic and pedal positions.
6. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. SCAS On. During straight and level flight, the P* will smoothly reduce the collective to establish torque at 45 percent or 25 psi and airspeed at 100 KIAS. He will maintain torque, airspeed, and trim and will note that the cyclic is nearly centered and that the pedals are neutral. The P will verify that the pedals are neutral. The P* will turn the force trim on and note that it tends to hold the aircraft attitude. He will then turn off the force trim.
2. SCAS Off. The P* will maintain torque, airspeed, and trim and will note the control positions. He will disengage all SCAS channel switches and note the control positions. The P* will compare the control positions with those noted for the SCAS on. The P* will then reengage the SCAS.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform autorotation RPM check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS, with the landing check completed at a predetermined entry altitude and airspeed, and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Maintain aircraft within gliding distance of the emergency landing area.
5. Maintain entry airspeed of 80 KIAS, ±5 KIAS.
6. Maintain the aircraft in trim.
7. Complete the recovery to powered flight prior to descending below 500 feet AGL.
8. Correctly perform crew coordination actions.
DESCRIPTION: The P* will maintain 80 KIAS and then smoothly lower the collective to the fully down position. He will retard the throttle to the flight idle position while ensuring that the main rotor does not overspeed. The P* will note that the N1 stabilizes at flight idle (68 to 72 percent) and that the aircraft is in trim. He also will note that the torque is at 0 percent or 0 psi and that sufficient right pedal remains. The P* will note any unusual vibrations and ensure that the rotor is stabilized at the appropriate RPM. He will perform the power recovery by smoothly increasing the throttle to fully open and will note that the needles join. The P* will then increase the collective to a power setting that will establish a positive climb. The P will clear the aircraft and assist as directed by the P*.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform vibration analysis.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly check and perform all items in sequence.
3. Maintain a minimum safe altitude.
4. Properly note any change in vibration level.
5. Maintain the aircraft in trim.
6. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. Crew Actions. The P will focus his attention primarily outside the aircraft and will assist in clearing. He will announce when his attention is focused inside the cockpit; for example, when recording the results of the checks.
2. Procedures.
a. Cruise and descent check. The P* will establish straight and level flight at 80 KIAS and will note the vibration level. He will maintain 80 KIAS and reduce torque to 15 to 18 percent (AH-1E, AH-1F, or AH-1P) or 8 to 10 psi (AH-1S). The P* will note any vibration or change in the vibration level during the descent and then will reestablish straight and level flight at 80 KIAS.
NOTE: The cruise and descent check is only required on aircraft with B 540 rotor blades installed.
b. Acceleration check. The P* will smoothly increase airspeed in 10-KIAS increments, up to 150 KIAS, or until he notes an unacceptable vibration level. He will note the airspeed at which any change in the vibration level occurs. The P* will then resume normal flight.
c. G loading check. The P* will place the aircraft in straight and level flight and adjust the torque to maintain 80 KIAS. He will execute a 20- to 30-degree dive and will maintain entry torque and aircraft in trim. The P* will accelerate to approximately 130 KIAS. He will then perform a moderate G pullout, applying aft cyclic and adjusting collective as necessary to maintain torque and rotor within limits. The P* will note any excessive vibrations or pylon oscillations during the dive and recovery from the dive. The P* will then return the aircraft to cruise flight.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform communication and navigation equipment checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Maintain altitude as required to check all installed equipment.
2. Maintain airspeed as required.
3. Properly check all installed avionics equipment.
4. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION: The P* will check the operation of all installed communication and navigation equipment. He will check all communication radios on at least two frequencies, including the GUARD frequency. The P* will check navigation radios for correct needle indications. He will check the transponder with the nearest ATC facility. The P will clear the aircraft and check navigation equipment as directed by the P*.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform engine topping check.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Correctly determine the maximum indicated torque using the calibration factor (engine data plate torque).
2. Ensure that ECU and deice switches are off and that the pilot's altimeter is set to 29.92.
3. Maintain 80 KIAS, ±10 KIAS.
4. Correctly perform the engine topping check.
5. Correctly analyze and record topping data.
6. Correctly determine whether the aircraft passed or failed the engine topping check according to TMs 55-2840-229-23-1 and 55-2840-229-23-2.
7. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. Crew Actions. The P will focus his attention primarily outside the aircraft. He will assist in clearing the aircraft and perform other duties directed by the P*.
2. Procedure. The P* will initiate a normal climb until reaching 3,500 feet PA (minimum of 1,000 feet AGL). He will smoothly increase the collective to obtain maximum indicated torque, ensuring that N1, TGT, and torque limits are not exceeded. The P* will maintain maximum indicated torque until N2 decreases to 6400 RPM or 97 percent, until the N1 or TGT limit is reached, or until the maximum topping altitude is reached. If the N2 decreases prior to reaching a limit, the P* will maintain N2 at 6400 RPM or 97 percent. While passing through the next 1,000 feet PA, the P will record torque, N1, TGT, and PA. The P* will increase the collective to decrease the N2 to 6200 RPM or 94 percent. He will note no changes in N1 as he increases the collective. The P* will reduce the collective and descend to the topping altitude (PA) previously recorded. He will fly at the topping altitude for one minute, and the P will record the FAT. The P* will then reset the pilot's altimeter and resume normal flight.
NOTE 1: If the N1, TGT, or altitude limit is reached prior to actual engine topping (N2 decrease), the P will record N1, torque, TGT, PA, and FAT for use during the troubleshooting procedure.
NOTE 2: Actual topping of the aircraft engine is not required during training and evaluation. The intent is to demonstrate maneuver proficiency only.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform after-landing and engine shutdown checks.
CONDITIONS: In an AH-1 helicopter or an AH1FWS and given TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. Each crew member will complete the required checks pertaining to his assigned crew station according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF.
2. The aircrew and, if available, the ground crew will announce when their checks are completed.
REFERENCES:
TM 55-1520-236-23 series
TASK: Perform special/detailed procedures.
CONDITIONS: In an AH-1 helicopter with special equipment installed.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-234-CL or TM 55-1520-236-CL or TM 55-1520-236-MTF or TM 55-1520-244-MTF, with changes for special equipment posted, and use additional publications as required.
2. Correctly check and perform all items in sequence.
3. Correctly determine all malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION: The crew will check any additional/special equipment installed in the aircraft and demonstrate knowledge of the system and published operational checks. They also will demonstrate knowledge of published charts, graphs, and work sheets. They may perform selected checks orally.
REFERENCES:
Applicable publications for equipment installed