SDR ASAA2017031120121

Service difficulty report · Fmc · Boeing 737890

Difficulty date: March 11, 2017
Submitted: March 13, 2017
Operation: Air carrier
Aircraft: N508AS
Make and model: Boeing 737890
Aircraft serial: 35691
Aircraft time: 32,984 hours, 9,938 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Stage of operation: CR
How discovered: V
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

BOTH FMC'S FAILED MOMENTARILY INFLIGHT. LASTED LESS THAN 1 MINUTE. BOTH FMC'S RESTORED. ACFT GROUNDED. FOUND BOTH FMC'S WORKING. FMC FAULT REVIEW SHOWS L & R FMC FAIL PREVIOUS FLT. NO OTHER FLT LEGS SHOW FAILURES. ACCOMPLISHED FMC LRU TEST, PASSES. OPS GOOD IAW SUBTASK 22-11-37-700-001. NO HISTORY LAST 30 DAYS. SUSPECT INTERMITTENT FAIL. AMM TASK 34-61-00-710-801 TESTED GOOD.