SDR ASAA2019021628197

Service difficulty report · Autopilot Sys · Boeing 737890

Difficulty date: February 16, 2019
Submitted: February 20, 2019
Operation: Air carrier
Aircraft: N558AS
Make and model: Boeing 737890
Aircraft serial: 35177
Aircraft time: 48,043 hours, 14,190 cycles
System (JASC): 2210 · Autopilot System
Part: Autopilot Sys
Condition: Malfunctioned
Location: Cockpit
Stage of operation: AP
How discovered: O
Nature of condition: J
Precautionary procedure: K

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

What was found

AT APPROXIMATELY 2000' FEET ON ILS AUTOPILOT "B" DISCONNECTED AND FIRST OFFICER LOST ALL FLIGHT DIRECTOR GUIDANCE. GROUNDED - YES. PERFORMED DFCS BITE PROCEDURE AND FOUND NO FAULTS PER FIM 22-11 TASK 801. PERFORMED FAULT HISTORY CHECK AND FOUND FAULT CODE 22-11428. PERFORMED FIM 22-11 TASK 809 FOUND NO FAULTS. ALSO FOUND FAULT CODE 22-11052. PERFORMED FIM 22-11 TASK 805 AND NO FAULTS FOUND. PERFORMED GOOD BITE LIBRARY TEST GROUP 11 PER AMM 22-11-00-740-801. COULD NOT DUPLICATE PROBLEM.