MAY 2015 Chapter 22 Autopilot Page 22.3
22-10 (Pitch) Servo Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 22-1.
A. Removal
1. Turn battery & avionics switches off and pull out AUTOPILOT (5 amp) circuit breaker
at panel.
2. Remove F680-3 and F445-1 collective covers and F444-1 cyclic cover. Hinge front
right seat forward. Remove G702-7 cover assembly under pilot's seat.
3. Remove avionics and avionics trays as required from lower console.
CAUTION
Do not change the length of A336-8 push-pull tube and A127-3
rod ends center-to-center dimension (4.27–4.33 inches).
4. Position cyclic stick full aft and apply cyclic friction. Remove hardware (and C130-50
spacer) securing D354-3 (pitch) servo assembly arm to A336-8 push-pull tube's rod end.
5. Disconnect servo harness from 01311-03-11 flight control computer's J1 PITCH
receptacle. Cut and discard ty-rap securing harness to M23190/1-2 clamp and pull
harness through access holes into control tunnel.
6. Support servo and remove hardware securing servo's D353-4 brace to cyclic box and
keel panels. Carefully remove servo from control tunnel.
B. Installation
1. Turn battery & avionics switches off and pull out AUTOPILOT (5 amp) circuit breaker
at panel. Position cyclic stick full aft and apply cyclic friction.
2. Position D354-3 (pitch) servo assembly in control tunnel and install hardware securing
servo's D353-4 brace to cyclic box. Standard torque bolts per § 20-32 and torque
stripe per Figure 5-1. Install screws securing brace to keel panels. Verify security.
3. Route servo harness through access holes and connect harness to 01311-03-11 flight
control computer's J1 PITCH receptacle. Install ty-rap securing harness to M23190/1-
2 clamp. Cinch ty-rap until snug without over-tightening, and trim tip flush with head.
Verify harness security.
4. Install hardware (and C130-50 spacer) securing servo arm to A336-8 push-pull tube's rod
end. Standard torque bolt per § 20-32 and torque stripe per Figure 5-1. Verify security.
5. Verify length of A336-8 push-pull tube and A127-3 rod ends center-to-center dimension
is 4.27–4.33 inches.
6. Verify freedom of flight controls through full travel with and without friction applied.
7. Install avionics trays and avionics if removed. Verify security.
8. Push in AUTOPILOT circuit breaker (5 amp) at panel. Perform ground checks as
appropriate per § 22-61.
9. Install G702-7 cover assembly under pilot's seat. Install F444-1 cyclic cover, and
F445-1 and F680-3 collective covers. Verify security.
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