SDR ASAA2020110833525

Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date: November 8, 2020
Submitted: November 11, 2020
Operation: Air carrier
Aircraft: N597AS
Make and model: Boeing 737890
Aircraft serial: 35689
Aircraft time: 46,035 hours, 13,913 cycles
System (JASC): 2230 · Auto Throttle System
Part: Autothrottle Sys
Condition: Malfunctioned
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

AUTOTHROTTLE DISENGAGED INFLIGHT, WILL NOT RE-ENGAGE. GROUNDED-YES. PERFORMED A/T BITE PROCEDURE, REF B737-800 FIM 22-31 TASK 801, NO ACTIVE FAULTS FOUND. IN FAULT HISTORY FOUND FAULT MESSAGE NR 22-31688 (RATE MONITOR, CHAN -A), PER FIM 22-31 TASK 819 INTERMITTENT FAULT. PERFORMED A/T SYSTEM OPERATIONS TEST, NO CURRENT FAULTS. OPERATIONS CHECK GOOD, REF B737-800 AMM 22-31-00-710-801, ALL TEST PASS.