SDR ASAA2021070335242

Service difficulty report · Fmc · Boeing 737890

Difficulty date: July 3, 2021
Submitted: July 7, 2021
Operation: Air carrier
Aircraft: N529AS
Make and model: Boeing 737890
Aircraft serial: 35198
Aircraft time: 39,943 hours, 11,784 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Stage of operation: CL
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

IN CLIMB OUT WITH FO F/D ON MASTER VNAV DISENGAGED AND LNAV TRACK DISAPPEARED FROM FO NAV DISPLAY. "SINGLE FMC OPERATION" IN FO SCRATCHPAD WITHOUT ANY INDICATIONS OTHER THAN FMC P/RST. FMC RESTORED ON ITS OWN WITHIN APPROX 3 MIN. GROUNDED - YES. DFCS HISTORY BITE SHOWED FAULT CODE 22-11822. T/S PER B737-800 FIM 22-11 TASK 811 - OPS NML. OK FOR SVC. FMC OPS NML - DUAL LAND PASS PER AMM AND FMC TEST PASS PER B737-800 AMM 34-61-00.