Inspection Of Roll Pins On Weible Powerpaks - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
3-12. INSPECTION OF AILERON SPROCKET AND CHAIN. (Refer to Figure 3-5.)
a.
To determine if corrective action is required because of misalignment of the pilot's control wheel
sprocket and mating aileron control chain, it will be necessary to perform the following checks at each 100
hour inspection of the airplane.
NOTE
To adequately perform the following checks, the aircraft should
be located in an area relatively free of excessive noise and
vibration.
1. Gently grasp the pilot's control wheel with both hands. Slowly rotate the wheel while
carefully listening for sounds of roughness or the feel of uneven action when the aileron chain links pass
over each tooth of the sprocket.
2. With one mechanic slowly rotating the pilot's control wheel, and another mechanic (with
flashlight and mirror) observing the movement of the aileron chain over the sprocket, observe for smooth
flow of the chain links over the sprocket throughout the total travel of the control wheel.
b. If roughness or uneven action is not felt, heard or seen, no further action is required.
c.
If roughness or uneven action is detected, it could be due to lack of lubrication on the chain (if
so, clean and lubricate), bent teeth on the sprocket (if so, sprocket must be replaced) or sprocket/control
chain misalignment that must be corrected as follows:
1. Inspect at outboard end of sprocket housing to determine if the .032 shim is installed
between the offset in the housing and the bulkhead. Install shim if it is not present. This shim will ensure
proper horizontal alignment.
2.
To attain proper vertical alignment, install new .012 shims between the top or bottom of
the sprocket housing and the bulkhead, as required, to ensure a smooth flow of the chain links over the
sprocket.
3-13. INSPECTION OF ROLL PINS ON WEIBLE POWERPAKS. (Refer to Figure 6-15.) See latest
revision Piper Service Bulletin #573.
a.
Refer to paragraph 6-21 for location of and access to components of Weible Powerpak.
b. With inspection mirror and light source, inspect spur gear/roll pin.
c. Roll pin should be flush (or not to exceed 1/16") in relation to the spur gear outside surface.
d.
If roll pin installation is within above dimensions, no further action is required.
e. If roll pin protrudes excessively (Ref. C above), remove powerpak (ref. para. 6-21), and replace
existing spur gear roll pin.
f.
Reinstall powerpak. (Ref. para. 6-54.)
Reissued: 9/23/80
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