SDR ASAA2015092213168

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: September 22, 2015
Submitted: September 24, 2015
Operation: Air carrier
Aircraft: N435AS
Make and model: Boeing 737990ER
Aircraft serial: 43292
Aircraft time: 7,425 hours, 2,432 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
Location: Left
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

LEFT FMC FAILED. FOLLOWED QRH. UNABLE TO RESTORE LT FMC. NO POSITION INFORMATION ON POS PAGE 3/3 FOR FMC-L. ACFT GROUNDED. VERIFIED LT FMC HAD NO DATA LAST FLIGHT. RETURNED FMC TRANSFER SWITCH TO NORMAL. VERIFIED BOTH FMC'S PROMPS SHOW ON MCDU'S. ACCOMPLISHED FMC SYSTEM OPS TEST, TEST PASSES. REF MM 34-61-00-730-801.