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
C167-5 Housing RFQ
110-3 Telatemp (temperature recorder 180°-230°F) RFQ
C006-7* Main Rotor Gearbox and Mast Assembly RFQ
D117-1 Guard RFQ
C796-2 Shim (3 maximum per aft pad) RFQ
C184-2 Bearing Assembly - Upper RFQ
C007-5R C007-5 Shaft and Bearing Assembly (overhaul exchange) RFQ
A185-1 Bracket RFQ
C051-1R C051-2 Actuator Assembly (overhaul exchange) RFQ
MS24566-1B Pulley (or AN210-1A) RFQ
C345-1 Strut Weldment RFQ
AN316-5R Nut RFQ
MS20426AD3 Rivet RFQ
B158-3 Heat Shrink (around wires, terminals) RFQ
A215-017 O-Ring RFQ
A215-020 O-Ring RFQ
A141-11 Washer RFQ
D774-4 Spring (alternate part no. C0420-063-2000S) RFQ
B330-19 Palnut RFQ
MS21042L08 Nut RFQ
A7260 Chip Detector RFQ
C264-1 Housing RFQ
AS111 O-Ring RFQ
A257-2LT Oil - Gearbox (one-liter bottle) RFQ
D113-1 Link RFQ
NAS1352-4-16 Screw RFQ
NAS1352-4-30 Screw RFQ
A130-41 Spacer RFQ
D117-2 Guard RFQ
MS27039C1-07 Screw RFQ
A257-4 Oil - Type “A” ATF (Dexron III) RFQ
C191-1 Block RFQ
NAS6603-24 Bolt RFQ
D113-2 Link RFQ
NAS1149F0432P Washer (or NAS1149F0463P to fill gap) RFQ
NAS6606-31 Bolt RFQ
C238-23 Support - Roof RFQ
NAS1149F2432P Washer RFQ
B125-2 Connector RFQ
C263-2 Sump (requires A215-222 o-ring) RFQ
C182-1 Nut RFQ
C053-2 Switches Assembly RFQ
A215-222 O-Ring RFQ
D118-1 Bracket Assembly RFQ
A257-19 Lubricant RFQ
B563-2 Sight Gage RFQ
C170-2 Sheave - Upper (anodized) RFQ
B158-8 Heat Shrink (14-volt ships) RFQ
B350-3 Spring Pin RFQ
R8206 C283-3 Mast Tube Upgrade Kit RFQ
C647-1 Bearing (main rotor shaft upper bearing) RFQ
B263-14 Housing (28-volt ships) RFQ
C967-1 Plug RFQ
MS24665-134 Cotter Pin RFQ
D500-1 Pump RFQ
C796-3 Spacer RFQ
A215-382 O-Ring (use only with C263-2 sump) RFQ
A938-5 Mount - Test Switches RFQ
C947-1 Flex Plate Assembly RFQ
MS20002-24 Washer (against hub) RFQ
A130-40 Spacer RFQ
MS27039C0812 Screw RFQ
C007 Shaft and Bearing Assembly RFQ
E0240-037-3500S Spring RFQ
220-242400-09 Clip RFQ
B158-8 Heat Shrink RFQ
V3-1001 Switch (use B158-2 or -3 around terminals) RFQ
MS3367-5-9 Ty-Rap RFQ
A796-1 Shim (3 maximum per fwd pad) RFQ
C907-2 Yoke (shaft length - 2.90 in.) RFQ
MS20426AD4 Rivet (at outboard positions) RFQ
C264-2 Housing RFQ
NAS1352-4-12 Screw RFQ
NAS1149F0432P Washer RFQ
AGC-3 Fuse (3 amp, for 14-volt ships) RFQ
C907 Yoke RFQ
NAS620-8 Washer RFQ
B270-2 Sealant - Metal (silver) RFQ
A215-152 O-Ring RFQ
C006-2 Rotor Brake Assembly RFQ
MS27039C1-09 Screw RFQ
A185-3 Plate RFQ
C018 Clutch Assembly RFQ
C018-2R C018-2 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
KI-202 Retainer Upgrade Kit RFQ
B158-12 Heat Shrink RFQ
NAS6604-13 Bolt RFQ
MS20995C32 0.032 in. dia. Safety Wire RFQ
C146-5 Gear Set RFQ
B263-4 Socket RFQ

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