Service difficulty report · Aileron · Cessna 177B

Difficulty date
January 12, 2023
Submitted
January 12, 2023
Operation
General aviation
Aircraft
N34739
Make and model
Cessna 177B
Aircraft serial
17701971
Part
Aileron
Condition
Restricted
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

INSTALLATION OF TRUTRAK AUTOPILOT STC'D ROLL SERVO LIMITED AILERON TRAVEL. THE SERVO ARM IS CONNECTED TO THE RIGHT AILERON BELLCRANK VIA A ROD. THE SERVO ARM CONTACTED A SERVO BRACKET IN THE AFT DIRECTION AND THE BOLT ATTACHING THE ROD TO THE ARM CONTACTED THE SERVO MOUNT IN THE FORWARD DIRECTION. DURING A FLIGHT CONTROL RIGGING CHECK IT WAS DISCOVERED THAT THIS CONTACT LIMITED THE AILERON BELLCRANK ROTATION TO THE POINT THAT FULL TRAVEL OF THE AILERON WAS NOT POSSIBLE. A SHORTER BOLT WAS INSTALLED TO ALLOW CLEARANCE IN THE FORWARD MOVEMENT OF THE ARM. HOWEVER, IT IS BELIEVED THAT THE PRESENCE OF THE MECHANICAL TRAVEL LIMITATIONS OF THE SERVO SHOULD NOT IMPEAD TRAVEL OF THE AIRCRAFT'S AILERON BELLCRANK.

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