This chapter describes those maneuvers and procedures that are essential for sustaining maintenance aircrew skills. Tasks will be performed for both training and evaluation. If discrepancies are found between this chapter and TM 55-1520-248-MTF, the technical manual takes precedence.
a. Task Number and Title. Each task is identified by a number and a title which correspond to the tasks listed in Chapter 5 (Figure 5-4).
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 P* (pilot on the controls), P (pilot not on the controls), PI, and CPO. During maintenance test flights, the MP will be the PC except during an evaluation conducted by an ME. Unless stated otherwise in the task description, the P* also refers to the maintenance test pilot.
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; for example, the completion of the engine start and run-up checks by the P*/P for their designated seat positions.
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.
CONDITION: In an OH-58D helicopter and given TMs 55-1520-248-10 and 55-1520-248-CL.
STANDARDS:
1. Without error, perform the preflight inspection according to TM 55-1520-248-10/CL.
2. Correctly check and perform all items in sequence.
3. Correctly determine aircraft suitability for flight.
4. 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 MP will ensure that the preflight inspection is conducted according to TMs 55-1520-248-10 and 55-1520-248-CL. He will ensure that the appropriate information is entered on DA Forms 2408-12 and 2408-13.
2. The crew will assist the MP complete the preflight.
3. The MP will determine the maneuvers or checks necessary for the maintenance test flight. The crew will use additional publications and references as necessary. The MP will brief the crew and any supporting ground crew members concerning operation on or around the helicopter and will ensure that ground communication capability is adequate. He will stress any applicable safety considerations or procedures during the briefing.
4. The MP will ensure that a walk-around inspection is completed following preflight.
REFERENCES:
TM 55-1520-248-23 series
TASK: Perform before-starting engine checks.
CONDITION: In an OH-58D helicopter and given TM 55-1520-248-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-248-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. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will call out all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions that have been marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks as directed by the P and announce when the checks are completed.
REFERENCE:
TASK: Perform starting-engine checks.
CONDITION: In an OH-58D helicopter and given TM 55-1520-248-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-248-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. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions that have been marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* and P and the ground crew member(s), if available, will clear the area around the aircraft before starting the engine.
3. Before starting the engine, the crew will ensure that all appropriate internal and external lights are operational and properly set.
4. The P* will announce the initiation of the engine start and the appropriate items to be recorded during the start sequence; for example, TGT and the duration of start time.
5. The P will acknowledge any message(s) displayed on the MFD and notify the P* of the message(s).
REFERENCES:
TASK: Perform engine run-up pilot checks.
CONDITION: In an OH-58D helicopter and given TM 55-1520-248-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-248-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. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks as directed by the P and announce when the checks are completed.
REFERENCE:
TASK: Perform system checks.
CONDITION: In an OH-58D helicopter and given TM 55-1520-248-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-248-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. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks as directed by the P and announce when the checks are completed.
NOTE: These checks are designed to verify the function of those items called out in the check list.
REFERENCE:
TASK: Perform before-takeoff checks.
CONDITION: In an OH-58D helicopter and given TM 55-1520-248-MTF.
STANDARDS:
1. Without error, perform procedures and checks according to TM 55-1520-248-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. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks as directed by the P and announce when the checks are completed.
REFERENCE:
TASK: Perform takeoff to a hover.
CONDITION: In an OH-58D helicopter with before-takeoff check completed.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Note cyclic, collective, and pedal control response.
3. Maintain a 3-foot hover altitude, ±1 foot.
4. Note the center of gravity.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will ensure that all control and instrument indications are normal, will announce his intention to bring the aircraft to a stationary hover, and will keep a visual reference outside the aircraft. He will then increase the collective with a smooth, positive pressure and will apply antitorque pedals as needed to maintain heading while coordinating the cyclic to achieve a vertical ascent. He will announce that the aircraft is stabilized. He will also 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. While hovering into the wind, the P* will note that the cyclic and pedal positions are normal for conditions.
2. The P will verify that all system instruments are in the normal ranges for conditions and record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
REFERENCE:
TASK: Perform power assurance check.
CONDITION: In an OH-58D helicopter with takeoff-to-a-hover check completed.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain a 3-foot hover altitude, ±1 foot.
4. Record the required readings.
5. Check engine torque against power assurance chart.
6. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P* will perform the check at a stabilized 3-foot hover into the wind, will keep visual reference outside the aircraft, and will verify that the HTR and ENG ANTI ICE are OFF. The P* will direct the P to record the FAT, TGT, PA, and engine torque. The P* will land the aircraft. He will determine if the readings are within normal limits by entering the data in the appropriate power assurance chart.
2. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
NOTE: All performance charts are based on an engine operating at 100-percent efficiency. An engine that is operating at less than 100-percent efficiency may be weaker than that modeled in the computation for aircraft performance shown in the operator's manual. The power assurance check verifies this by comparing a given TGT. to a given engine torque output. If the indicated engine torque is greater than that charted, the engine is performing above 100 percent. If the indicated engine torque is less than the charted torque, the engine is performing at less than 100-percent efficiency. Even if the aircraft engine is performing at less than 100-percent efficiency, the crew may elect to proceed with the mission. For instance, the crew may decide that an engine operating at 98-percent efficiency is adequate for the flight. In any case, a weak engine is a candidate for maintenance action or replacement. (The crew will refer to the appropriate troubleshooting procedure.)
REFERENCES:
TASK: Perform hover power check.
CONDITION: In an OH-58D helicopter with takeoff to a hover and power assurance checks completed.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain a 3-foot hover altitude, ±1 foot.
4. Record the required readings.
5. Check mast torque against the PPC.
6. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform the check at a stabilized 3-foot hover into the wind, will keep a visual reference outside the aircraft, and will have the P record mast torque, TGT, and NG. The P* will determine that readings are within normal limits. He will compare mast torque with the PPC and apply Task 1016, Perform hover power check, as appropriate. After checking the parking area for any indication of leaks and announcing that the check is completed, he will hover to the test-flight hover area.
REFERENCES:
TASK: Perform hovering turns.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Maintain a 3-foot hover altitude, ±1 foot.
3. Perform turns not to exceed the rate of 90 degrees in 4 seconds.
4. Note tail rotor response and rigging.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover into the wind and will keep a visual reference outside the aircraft. He will apply pressure on the desired pedal to begin the turn and will use pressure and counterpressure on the pedals to maintain a constant rate of turn. (The P* will note that excessive pedal positions are not required during the maneuver.) He will make hovering turns to the left and right (90 degrees to either side of the wind direction) and announce that the check is completed.
REFERENCE:
TASK: Perform sideward flight.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Maintain a flight path that is approximately perpendicular to the wind direction.
3. Maintain a 3-foot hover altitude, ±1 foot.
4. Limit ground speed to 5 knots.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover into the wind, keeping a visual reference outside the aircraft. He will perform sideward flight in both directions with the aircraft positioned into the wind. (The P* will note that no excessive inputs are required during the maneuver, and the desired aircraft response is achieved.) After the P* centers the cyclic, the aircraft should drift to a stop. He then announces that the check is completed.
REFERENCE:
TASK: Perform forward flight to ETL.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain a 5-foot hover altitude, ±1 foot.
4. Note cyclic and tail rotor pedal responses.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 5-foot hover into the wind. While keeping a visual reference outside the aircraft, he will apply sufficient forward cyclic to accelerate to ETL. (The P* will note that excessive control inputs are not required during the maneuver and that aircraft response is normal.) After ETL is achieved, he will return the aircraft to a stabilized 5-foot hover and announce that the check is completed.
NOTE: The 5-foot standard, 31 foot, is measured from the pilot station and ensures that the tail rotor does not strike the ground during the maneuver.
REFERENCE:
TASK: Perform SCAS check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain a 5-foot hover altitude, ±1 foot.
4. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 5-foot hover into the wind and will keep a visual reference outside the aircraft. He will induce pitch, roll, and yaw inputs with the SCAS system engaged. The P* will check each axis separately by inducing a control input. The control inputs should be smooth but large enough to induce a momentum to the fuselage of the aircraft. If the SCAS system is functioning properly, centering the appropriate aircraft control should cause movement to dampen almost immediately. To ensure that the system is functioning properly, the P* will disengage the SCAS and repeat the check. When the SCAS is disengaged, movement of the fuselage will usually continue after the appropriate control is centered. The P* will complete the check, return to a 3-foot hover, and announce that the check is completed.
3. The P will acknowledge the SCAS DISENG message when the P* disengages the SCAS. He will reengage the SCAS PITCH/ROLL and YAW switches when the P* announces that the check is completed.
REFERENCE:
TASK: Perform heading hold check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all the required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF work sheet any normal condition marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover into the wind and keep a visual reference outside the aircraft. He will engage heading hold and check that the HDG HOLD displays on the MFD. The P* will guard the tail rotor pedals, bring the aircraft to a stabilized 10-foot hover, and announce to the P when the aircraft is stabilized. He will descend to a 3-foot hover. The P* will then move the SCAS heading hold ENGA/DISENG trim switch to R (right) and L (left) to hange the aircraft heading at least 10 degrees to the right and at least 10 degrees to the left. The P* will apply slight pressure (left or right) to the antitorque pedals and note that heading hold disengages and the HDG HOLD message deletes from the MFD. He will then announce that the check is completed.
3. The P will verify that the heading at a 3-foot hover is within ±2 degrees of the initial heading once heading hold is engaged. After the P* announces that the aircraft is stabilized at a 10-foot hover, the P will check that the aircraft heading is the same as it was when the aircraft was stabilized at a 3-foot hover. Aircraft heading should be maintained within ±2 degrees.
NOTE: Heading accuracy is best determined by displaying the HSD page using map offset.
REFERENCE:
TASK: Perform power cylinder check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Ensure that the P completes the safety briefing.
4. Maintain a 10-foot hover altitude, +5 feet, -2 feet.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 10-foot hover into the wind and keep a visual reference outside the aircraft. He will move the cyclic smoothly (approximately 3 inches to either side of the center) along a 45-degree line from the left-rear to the right-forward quadrant. The P* will move the cyclic several times. He will check the left servo by moving the cyclic from the right-rear to the left-forward quadrant. (The P* will note the operation of the right and left cyclic servos to ensure that movement is smooth and without restriction.) The P* will return the aircraft to a stabilized 3-foot hover and announce that the check is completed.
3. The P will hold the HYD SYS switch throughout the check and verify that the LOW HYD PRESS message does not display during the check.
NOTE: The power cylinder check is primarily a flow capacity check of the hydraulic pump.
REFERENCE:
TASK: Perform engine response check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Ensure that aircraft altitude does not exceed 50 feet AGL.
4. Note engine response.
5. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover into the wind and will keep a visual reference outside the aircraft. He will make a positive increase in the collective pitch. The engine should respond smoothly and rapidly. The P* will ensure that NG increases in less than 1 second. He will reduce the collective before too much altitude is gained (50 feet). The P* will land the aircraft, reduce the throttle to the idle position, move the fuel control switch to the ANLG BACK UP position, and increase the throttle to the full-open position. The P* then moves the RPM increase/decrease switch to the plus (+) and minus (-) positions. (Nr/Np should remain constant.) He will then stabilize the aircraft at a 3-foot hover, make a positive increase in the collective pitch, and note Nr/Np. The P* will reduce the collective before too much altitude is gained (50 feet), land the aircraft, and reduce the throttle to the idle position. He will return the fuel control switch to the NORM position and increase the throttle to the full-open position. The P* will then set the Nr to 100 percent and announce that the check is completed.
NOTE 1: Nr/Np may underspend or overspeed slightly but should begin to stabilize within two to five seconds.
NOTE 2: The purpose of the engine-response check is to test the response of the engine when a moderate power demand is placed on it.
REFERENCE:
TASK: Perform hover/hover bob-up check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain a 3-foot hover altitude, ±1 foot.
4. Correctly determine malfunctions or discrepancies and apply the corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover into the wind over a readily identifiable position and will keep a visual reference outside the aircraft. He will select the hover page on the MFD, press the hover bob-up switch, note the hover position box, and stabilize the aircraft for 15 seconds. (The hover position box should remain stable.) The P* will reposition the aircraft approximately 10 to 15 feet forward, and then return it to the original position flying rearward. Once the aircraft is repositioned, he will hover the aircraft laterally either left or right 10 to 15 feet and will return the aircraft to the original position flying in the opposite direction. If the hover position box error is excessive, the P* will perform a doppler calibration and announce that the check is completed.
NOTE 1: When flight is conducted away from the position box, the velocity vector should move in the appropriate direction and the position box should move opposite the velocity vector.
NOTE 2: Navigation system accuracy can affect position-box drift and doppler calibration.
REFERENCES:
TASK: Perform takeoff and climb check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Without error, perform takeoff and climb check according to TM 55-1520-248-MTF.
3. Correctly check and perform items in sequence.
4. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check from a stabilized 3-foot hover in the direction of takeoff and keep a visual reference outside the aircraft. During takeoff and climb, he will ensure that the radar altimeter vertical analog bar displays up to 200 feet, ±10 feet, and then disappears. The P* will note that the HI indicator flashes at 200 feet, ±10 feet. He will initiate a fuel consumption check, check for unusual vibrations, and announce that the check is completed.
REFERENCE:
TASK: Perform control rigging check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain an airspeed of 100 KIAS, ±5 KIAS.
4. Maintain torque at 80 percent, ±2 percent.
5. Maintain the aircraft in trim.
6. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
7. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check into the wind from an altitude that will allow safe recovery and will keep a visual reference outside the aircraft. Maintaining the appropriate airspeed, torque, and trim, he will disengage the SCAS, turn the force trim on, and note that the cyclic is nearly centered laterally. The P* will relax the cyclic pressure and note that the cyclic remains in place. After completing the cyclic check, he will turn the force trim off, relax the pedal pressure, note the pedal position and response, and announce that the check is completed.
3. The P will acknowledge the SCAS disengage message when the P* disengages the SCAS. He will reengage the SCAS PITCH/ROLL and YAW switches when the P* announces that the check is completed.
NOTE: The control rigging check is designed to verify tail-rotor rigging.
REFERENCES:
TASK: Perform autorotation RPM check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Complete power recovery before reaching 500 feet AGL.
4. Maintain an airspeed of 55 KIAS, ±5 KIAS.
5. Record Nr.
6. Perform correct power recovery procedure.
7. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
8. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check into the wind from an altitude that will allow safe recovery and will keep a visual reference outside the aircraft. Maintaining 55 KIAS, he will smoothly lower the collective to the full-down position and note that the main rotor does not overspeed. After ensuring that a suitable landing area can be reached, the P* will retard the throttle to the engine-idle position and note that NG is stabilized at engine idle. He will check that the Nr is within a normal operating range, the aircraft is in trim, and sufficient right pedal remains. The P* will check that no unusual vibrations occur, the engine and mast torques are at or near zero, and the rotor is stabilized at the appropriate Nr. He will then perform a power recovery by advancing the throttle to full-open and ensuring that Nr/Np is joined and stabilized before increasing the collective. The P* will establish a climb prior to reaching 500 feet and announce that the check is completed.
3. The P will acknowledge any messages that display and will notify the P*.
REFERENCE:
TASK: Perform hydraulics-off check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Position the aircraft into the wind.
3. Maintain an airspeed of 80 KIAS, ±10 KIAS.
4. Ensure that the P completes the safety briefing.
5. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check into the wind from an altitude that will allow safe recovery and will keep a visual reference outside the aircraft. He will direct the P to turn the HYD SYS switch OFF. The P* will check that the cyclic control forces are normal for conditions and check controllability by entering shallow right and left turns. He will decrease and increase the collective and will check that at least 17-percent mast torque down and 83-percent mast torque up can be reached without excessive pressure or without exceeding any limitations. Upon completion, the P* will stabilize the controls, relax the pressure, and announce that the check is completed.
3. When directed to do so by the P*, the P will turn the HYD SYS switch OFF and will acknowledge the SCAS DISENG and LOW HYD PRESS messages. He will turn the HYD SYS switch to the HYD SYS position and reengage the SCAS PITCH/ROLL and YAW switches when the P* announces that the check is completed.
NOTE 1: The P* should relax control pressures before the P turns the HYD SYS switch to the HYD SYS position.
NOTE 2: The primary purpose of the hydraulics-off check is to ensure aircraft controllability.
REFERENCE:
TASK: Perform collective anticipator check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Maintain an airspeed of 80 KIAS, ±10 KIAS.
3. Stabilize NG at 78 percent, ±1 percent.
4. Do not exceed any limitations.
5. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
6. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will begin the check into the wind from an altitude that will allow safe recovery and will keep a visual reference outside the aircraft. While maintaining 80 KIAS, he will enter the maneuver by lowering the collective until an NG of 78 percent, ±1 percent, is reached and then allow the NG to stabilize. Once NG is stabilized, the P* will make a positive increase in the collective at a rate which will attain 85 percent mast torque in five seconds. He will then check to ensure that the Nr/Np droop does not exceed 4 percent. When the check is completed, the P* will return to the original torque value, resume normal flight, and announce that the check is completed.
NOTE 1: If the Nr/Np droop exceeds 4 percent, the P* will terminate the test flight and return to the maintenance facility for corrective action.
NOTE 2: The primary purpose of the collective anticipator check is to verify proper collective anticipation of the ESC.
NOTE 3: The five-second pull is the minimum standard. For example, if system droop is only 2 percent in a three-second pull, the system is functioning properly.
REFERENCE:
TASK: Perform flight instruments check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is clear of all obstacles.
2. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
3. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check list any normal conditions that are marked with an asterisk or any or abnormal conditions noted by the P*.
2. The P* will begin the check into the wind from an altitude that will allow safe recovery and will keep a visual reference outside the aircraft. He will verify that standby instruments correlate with the vertical situation display page and will accomplish functional checks by using timed turns, climbs, and known power settings. He will announce that the check is completed.
REFERENCES:
TASK: Perform communication checks.
CONDITION: In an OH-58D helicopter or orally.
STANDARDS:
1. Check all avionics equipment.
2. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
3. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will verify that all radios are functioning properly and will keep a visual reference outside the aircraft. He will also verify that each radio functions on at least two separate frequencies. The P* will check both FM homing and any installed secure radio equipment for proper operation. He will also check the transponder with the local ATC facility and announce that the check is completed.
NOTE: This task may be performed by the P or the P*.
REFERENCES:
TASK: Perform before-landing check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Ensure that the aircraft is cleared of all obstacles.
2. Without error, perform a before-landing check according to TM 55-1520-248-MTF.
3. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks that are directed by the P and will announce that the checks are completed. During descent, the P* will note that the radar altimeter analog bar reappears, the LO indicator flashes, and the warning audio activates at 180 feet, ±10 feet, AGL.
REFERENCE:
TASK: Perform after-landing check.
CONDITION: In an OH-58D helicopter.
STANDARDS:
1. Without error, perform an after-landing check according to TM 55-1520-248-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal condition marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks that are directed by the P and will announce that the checks are completed.
REFERENCE:
TASK: Perform engine shutdown check.
CONDITION: In an OH-58D helicopter with the after-landing check completed.
STANDARDS:
1. Without error, perform an engine shutdown check according to TM 55-1520-248-MTF.
2. Correctly check and perform all items in sequence.
3. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
4. Correctly perform crew coordination actions.
DESCRIPTION:
1. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
2. The P* will perform all checks that are directed by the P and will announce that the checks are completed.
REFERENCE:
TASK: Perform special/detailed procedures.
CONDITION: In an OH-58D helicopter with equipment installed.
STANDARDS:
1. Without error, perform special/detailed procedures according to TM 55-1520-248-MTF.
2. Use additional reference publications as required.
3. Correctly check and perform all items in sequence.
4. Correctly determine malfunctions or discrepancies and apply corrective actions/troubleshooting procedures.
5. Correctly perform crew coordination actions.
DESCRIPTION:
1. The MP will check any additional special equipment installed in the aircraft and will demonstrate a knowledge of the system and the published operational checks. He will also demonstrate a knowledge of published charts, graphs, and work sheets. A complete check of all special/detailed procedures is not required on an evaluation. The MP may perform selected checks orally.
2. The P will announce all required checks in sequence according to TM 55-1520-248-MTF. The P will record on the MTF check sheet any normal conditions marked with an asterisk or any abnormal conditions noted by the P*.
3. The P* will perform all checks that are directed by the P and announce that the checks are completed.
REFERENCES: