Helicopter Rotor Drive System Parts Catalog

A helicopter rotor drive system features a control system and rotary blades. The rotor system is the rotating part of a helicopter which generates lift and consists of a mast, hub, and rotary blades. The blades are attached to the hub using various nuts and bolts. There are three main types of rotor drive systems: semirigid, rigid, and fully articulated. The classifications are based upon how the motor blades are attached and move in accordance to the main rotor hub.

In semirigid rotor systems, two blades are attached to a central hub. The hub can tilt according to the main rotor shaft using a teetering hinge. The teetering hinge is significant as it allows one blade to flap up and the other to flap down. This decreases the lead and lag forces on the blades. Semirigid rotor systems are simple, however the downside is that the reaction to control input is not as quick as articulated rotor systems.

In rigid rotor systems the blade roots are rigidly attached to the rotor hub. As they do not have hinges, rigid rotor systems rely on the bending of the rotor blades. The blades are unable to flap or utilize lead and lag movements. Despite these factors, rigid rotor systems are relatively straightforward in design and principle. Rigid rotor systems are considered to be the happy medium between semi rigid motor systems and fully articulated systems. A disadvantage of rigid rotor systems is the higher vibration levels that compromises the overall control and comfort of the helicopter.

FFully articulated rotor systems allow for more movement in the blades. The blades have lead/lag, independent flap capabilities and the ability to feather. Fully articulated rotor systems have two or more main rotor blades. As the rotor spins, each blade responds to inputs from the control system to enable aircraft control.

Newer rotor systems use elastomeric bearings, which are arrangements of rubber and steel that can allow motion in two axes. Compared to metal bearings, elastomeric bearings require less maintenance as they wear better.

Part No Description RFQ
R8206 C283-3 Mast Tube Upgrade Kit RFQ
NAS6608H42 Bolt RFQ
NAS6606-5 Bolt RFQ
NAS6606-31 Bolt RFQ
NAS6605-42 Bolt RFQ
NAS6605-38 Bolt RFQ
NAS6604-21 Bolt RFQ
NAS6604-13 Bolt RFQ
NAS6604-11 Bolt RFQ
NAS6603-8 Bolt RFQ
NAS6603-40 Bolt RFQ
NAS6603-28 Bolt RFQ
NAS6603-24 Bolt RFQ
NAS6603-12 Bolt RFQ
NAS6603-11 Bolt RFQ
NAS6603-10 Bolt RFQ
NAS428-3A-14 Bolt RFQ
NAS428-3-14 Bolt RFQ
NAS1304-15 Bolt RFQ
MS24665-283 Cotter Pin RFQ
MS24665-134 Cotter Pin RFQ
MS20995C41 0.041 in. dia. Safety Wire RFQ
MS20995C32 0.032 in. dia. Safety Wire RFQ
MS20074-04-04 Bolt (earlier non-hydraulic R44s) RFQ
D796-1 Duct Assembly RFQ
D276-3 Gearmotor Assembly (28-volt ships) . RFQ
D276-1 Gearmotor Assembly (14-volt ships) . RFQ
D262-11 Fuse Holder RFQ
D174-2R D174-2 Fanwheel Assembly (overhaul exchange) RFQ
D174-2 Fanwheel Assembly RFQ
D126-1 Cable Assembly RFQ
D123-1 Arm Assembly RFQ
D123-1 Arm Assembly - Lower RFQ
D122-1 Bracket Assembly RFQ
D118-1 Bracket Assembly RFQ
D117-2 Guard RFQ
D117-1 Guard RFQ
D114-1 Bracket RFQ
D111-1 Bracket RFQ
D110-1 Arm Assembly - Upper RFQ
D110-1 Arm Assembly RFQ
D049-4 Harness Assembly RFQ
C947-1 Flex Plate Assembly RFQ
C747-1 Baffle Assembly RFQ
C648-2 Bearing - Journal RFQ
C647-1 Bearing (main rotor shaft upper bearing) RFQ
C553-1 Block RFQ
C270-1 End Cover RFQ
C257-2 Cover RFQ
C244-1 Bracket RFQ
C191-1 Block RFQ
C184-2R C184-2 Bearing Assembly - Upper (overhaul exchange) RFQ
C184-2 Bearing Assembly - Upper RFQ
C181-3 Bearing RFQ
C146-5 Gear Set RFQ
C146-1 Gear Set RFQ
C051-2 Actuator Assembly (28-volt ships) RFQ
C051-1R C051-1 Actuator Assembly (overhaul exchange) RFQ
C051-1R C051-2 Actuator Assembly (overhaul exchange) RFQ
C051-1 Actuator Assembly (14-volt ships) RFQ
C049-5 Harness Assembly - Overtemp Switch RFQ
C049-4 Harness Assembly RFQ
C049-2 Harness Assembly RFQ
C018-3R C018-3 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
C018-3* Clutch Assembly RFQ
C018-2R C018-2 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
C018-2* Clutch Assembly RFQ
C018 Clutch Assembly RFQ
C007-5R C007-5 Shaft and Bearing Assembly (overhaul exchange) RFQ
C006-8R* C006-8 Main Rotor Gearbox and Mast Assembly RFQ
B566-1* Chip Detector RFQ
B270-10 Adhesive RFQ
B125-2 Connector RFQ
B115-1 Bearing RFQ
B049-3 Harness Assembly RFQ
AN814-8D Filler Plug RFQ
AN742-3 Clamp RFQ
AN3-41A Bolt RFQ
AGC-3 Fuse (3 amp, for 14-volt ships) RFQ
AGC-1.5 Fuse (1.5 amp, for 28-volt ships) RFQ
A7260 Chip Detector RFQ
A654-56 Decal RFQ
A650-4 Fitting RFQ
A185-5 Bracket RFQ
A185-2 Bracket RFQ
A185-1 Bracket RFQ
A15A Diode RFQ
31M22972* Engine Starter Ring Gear Assembly (supersedes LW-16471* and 31M21951* starter ring gear assembly used on O-540 engine) RFQ
220-242400-09 Clip RFQ
01960 Bead Chain RFQ

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