Headquarters
Department of the Army
Washington, DC
5 April 1991

FM 1-514

FUNDAMENTALS OF ROTOR AND POWER TRAIN MAINTENANCE-TECHNIQUES AND PROCEDURES

Table of Contents

PREFACE

CHAPTER 1 - PRINCIPLES OF HELICOPTER FLIGHT

AERODYNAMICS

BERNOULLI'S PRINCIPLE

LIFT AND THRUST

AIRFOIL STABILITY

STRESS

VIBRATION

NONDESTRUCTIVE INSPECTION

CHAPTER 2 - FUNDAMENTALS OF ROTORS

ROTOR SYSTEM

FORCES ACTING ON ROTORS

TERMINOLOGY

CHAPTER 3 - ROTOR SYSTEM OPERATION

SINGLE AND TANDEM ROTORS

FLIGHT CONTROLS

MAIN ROTOR HEAD ASSEMBLIES

TAIL ROTOR HUBS

MAIN ROTOR BLADES

TAIL ROTOR BLADES

CHAPTER 4 - ALIGNMENT AND TRACKING PROCEDURE

MAIN ROTOR BLADE ALIGNMENT

UNBALANCED SEMIRIGID ROTOR SYSTEMS

VERTICAL VIBRATIONS

MAIN ROTOR BLADE TRACKING

VIBREX BALANCING KIT

PRESERVATION

CHAPTER 5 - SINGLE-ROTOR POWER TRAIN SYSTEM

MAIN DRIVE SHAFT

MAIN TRANSMISSION

MAIN ROTOR MAST ASSEMBLY

TAIL ROTOR DRIVE SHAFT

INTERMEDIATE GEARBOX

TAIL ROTOR GEARBOX

CHAPTER 6 - TANDEM-ROTOR POWER TRAIN SYSTEM

ENGINE TRANSMISSION

ENGINE-COMBINING TRANSMISSION

FORWARD ROTARY-WING DRIVE TRANSMISSION

AFT ROTARY-WING DRIVE TRANSMISSION

DRIVE SHAFTS

GLOSSARY

REFERENCES

AUTHORIZATION LETTER

DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.

^*This publication supersedes FM 55-414, 27 June 1984.