SDR 4070198

Service difficulty report · Servo · Cessna 208B

Difficulty date
December 19, 2002
Submitted
January 14, 2003
Operation
Air carrier
Aircraft
N822SA
Make and model
Cessna 208B
Aircraft serial
208B0822
Engine
Pwa PT6A114A
Part
Servo
Part number
065005901
Part serial
29896
Condition
Overtorqued
Location
Autoflight
Part time
719 hours
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

COMPLIANCE WITH THE 1000 HOUR/ 12 MONTH KFC-150 AUTOPILOT SERVO CLUTCH TORQUE CHECK( TASK CODE 221009) OF SUBJECT SERVO REVEALED CLUTCH TORQUE TO BE 60 IN/LB, STC NR SA2053CED. SLIP CLUTCH VALUE TABLE SPECIFIES A TORQUE VALUE OF 43 IN/LB PLUS OR MINUS 4 IN/LBS. A RECORDS REVIEW REVEALED THAT THIS WAS THE FIRST COMPLIANCE OF THE TORQUE CHECK, INDICATING A POSSIBLE OUT OF SPECS CONDITION SINCE INSTALLATION DURING PRODUCTION BY THE MFG. TORQUE VALUE RESET TO SPECS AND SERVO WAS REINSTALLED. OPS CHECKS WERE OK.

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