SDR ASAA2021081935762

Service difficulty report · Fmc · Boeing 737890

Difficulty date: August 19, 2021
Submitted: August 24, 2021
Operation: Air carrier
Aircraft: N594AS
Make and model: Boeing 737890
Aircraft serial: 35191
Aircraft time: 47,913 hours, 14,205 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
Location: Nr 1
Stage of operation: TX
How discovered: O
Nature of condition: O
Precautionary procedure: D

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

What was found

#1 LEFT SIDE FMC FAILED AFTER PUSH BACK. GROUNDED - YES. FOUND NO BITE AVAILABLE FOR FMC 1. CYCLED POWER TO #1 FMC AND #2 FMC. 4 EA MIG51A INSTL AND REMOVED. PERFORMED BITE OF BOTH #1 AND #2 FMC. NO DEFECTS. NO INFLIGHT FAILURES LOGGED IN HISTORY. PERFORMED FMC OPERATIONAL CHECK FOR #1 AND #2 FMC'S. NO DEFECTS NOTED. ALL SOFTWARE CORRECT REF B737-800 AMM 34-61-00-710-801. ETOPS SIGNIFICANT SYSTEM. GROUND VERIFICATION SUCCESSFUL. SEAMC LANCE NOTIFIED.