Service difficulty report · Servo Control · Boeing 747422

Difficulty date
November 13, 2012
Submitted
November 15, 2012
Operation
Air carrier
Aircraft
N199UA
Make and model
Boeing 747422
Aircraft serial
28717
Aircraft time
61,794 hours, 7,219 cycles
Engine
Pwa PW4056
Part
Servo Control
Condition
Faulty
Location
Autopilot Sys
Stage of operation
IN
How discovered
C
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

CENTER FCC AND CTR RUDDER SERVO FAIL GROUND TESTS. AFTER SERVO CNTR REPLACE, FCC AND RUDDER SERVO TEST PASS IAW MM 22-10-00.