SDR AALA201903259003

Service difficulty report · Autopilot Sys · Boeing 757223

Difficulty date: March 22, 2019
Submitted: March 25, 2019
Operation: Air carrier
Aircraft: N172AJ
Make and model: Boeing 757223
Aircraft serial: 32400
Aircraft time: 54,937 hours, 15,614 cycles
System (JASC): 2210 · Autopilot System
Part: Autopilot Sys
Condition: Malfunctioned
Location: Left
Stage of operation: CR
How discovered: O
Nature of condition: J, F
Precautionary procedure: O

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

What was found

HAD AN UNCOMMANDED AUTOPILOT DISCONNECT, LT AUTOPILOT, 4 HOURS INTO FLIGHT. TURNED BACK ON DURING THE DESCENT AND WORKED REMAINDER OF FLIGHT. MAINTENANCE ACCOMPLISHED MCDP GROUND TEST 01 , L FCC IAW FIM 22-03-00-805-827, NO FAULTS FOUND . PERFORMED MCDP GROUND TEST 40, AUTOLAND IAW FIM 22-03-00-990-843. NO FAULTS NOTED ALL NORMAL .