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
A130-39 Spacer RFQ
D210-4 Nut RFQ
C167-5 Housing RFQ
C215-029 O-Ring (lubricate with A257-1 grease) RFQ
NAS1149D0316J Washer RFQ
B161-4 Spirap RFQ
D049-4 Harness Assembly RFQ
C251-1 Shaft - Main Rotor Drive RFQ
NAS1149FN816P Washer RFQ
MS20002-24 Washer (against hub) RFQ
MS21075L3E Nutplate RFQ
MS21042L5 Nut RFQ
D774-4 Spring (Associated Spring part no. C0420-063-2000S) RFQ
C191-1 Block RFQ
V3-1001 Switch (use B158-2 or -3 around terminals) RFQ
C270-1 End Cover RFQ
C264-1 Housing RFQ
C273-1 Roof Panel RFQ
MS20995C41 0.041 in. dia. Safety Wire RFQ
NAS1352-4-16 Screw RFQ
NAS1149F0632P* Washer RFQ
B033-6 Knob Assembly - Rotor Brake RFQ
MS20995C32 0.032 in. dia. Safety Wire RFQ
AN316-5R Nut RFQ
AN526C832R6 Screw RFQ
C263-2 Sump (requires A215-222 o-ring) RFQ
NAS6603-10 Bolt RFQ
MS27039C0812 Screw RFQ
B158-12 Heat Shrink RFQ
D113-1 Link RFQ
MS3367-5-9 Ty-Rap RFQ
C966-3 Seal RFQ
B289-3 Screw RFQ
AGC-1.5 Fuse (1.5 amp, for 28-volt ships) RFQ
B263-4 Socket RFQ
C966-5 Seal RFQ
MS24566-1B Pulley (or AN210-1A) RFQ
C195 Yoke RFQ
C653-3* Mount RFQ
NAS1149F0432P Washer (or NAS1149F0463P to fill gap) RFQ
C020-1 Upper Frame RFQ
MS27039C1-11 Screw RFQ
NAS6603-40 Bolt RFQ
C006-8* Main Rotor Gearbox and Mast Assembly RFQ
C168-4 Retainer RFQ
B270-10 Adhesive RFQ
C051-1 Actuator Assembly (14-volt ships) RFQ
NAS9301B-4-02 Rivet RFQ
B563-2 Sight Gage RFQ
B158-6 Heat Shrink (around fuse holder) RFQ
MS24665-134 Cotter Pin RFQ
C493-1 Sheave - Lower RFQ
C251-2 Shaft - Main Rotor Drive RFQ
C947-1 Flex Plate Assembly RFQ
C018-3R C018-3 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
C182-1 Nut RFQ
NAS6606-5 Bolt RFQ
110-3 Telatemp (temperature recorder 180°-230°F) RFQ
A215-029 O-Ring RFQ
A7260 Chip Detector RFQ
AN320-8 Nut (B270-11 on threads) RFQ
D262-11 Fuse Holder RFQ
MS20074-04-04 Bolt (earlier non-hydraulic R44s) RFQ
NAS6603-11 Bolt RFQ
B263-3 Pin RFQ
MS35206-228 Screw RFQ
C345-1 Strut Weldment RFQ
NAS620-10L Washer RFQ
A130-41 Spacer RFQ
A130-40 Spacer RFQ
B570-1 Magnet Assembly RFQ
AN742-3 Clamp RFQ
AN3-41A Bolt RFQ
C007-5R C007-5 Shaft and Bearing Assembly (overhaul exchange) RFQ
MS21042L08 Nut RFQ
C257-2 Cover RFQ
E0240-037-3500S Spring RFQ
C796-2 Shim (3 maximum per aft pad) RFQ
NAS1149F0432P Washer RFQ
NAS6604-21 Bolt RFQ
MS24566-1B Pulley (supersedes AN210-1A) RFQ
A185-2 Bracket RFQ
B330-16 Palnut RFQ
B033-6 Knob Assembly (includes knob and chain) RFQ
NAS6603-8 Bolt RFQ
A257-2LT Oil - Gearbox (one-liter bottle) RFQ
MS27039C1-07 Screw RFQ
D118-1 Bracket Assembly RFQ
B263-19* Housing RFQ
C006-7* Main Rotor Gearbox and Mast Assembly RFQ

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