SDR ASAA2019121643612

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 14, 2019
Submitted: December 17, 2019
Operation: Air carrier
Aircraft: N481AS
Make and model: Boeing 737990ER
Aircraft serial: 44106
Aircraft time: 17,254 hours, 5,590 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

INTERMITTENT INDICATIONS OF LEFT FMC FAILURE APPROXIMATELY 30 MINS. CONDITIONS RESOLVED ITSELF EVENTUALLY. NORMAL INDICATIONS FOR LAST 2 HOURS OF FLT. GROUNDED - YES. ACCOMP L/H FMC BITE TEST LAST FLT LEG SHOWS PGM FAULT INTERMITTENT. CYCLED PWR TO A/C. ACCOMP FMC SENSOR TEST, ALL PASS. ACCOMP FMC FIXED OUTPUTS TEST ALL PASS TEST. REF B737-900 FIM 34-61 TASK 801 & TASK 807 & B737-900 AMM 34-61-00-710-026.