SDR ASAA2018013023353

Service difficulty report · Lru · Boeing 737990ER

Difficulty date: January 30, 2018
Submitted: February 1, 2018
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 15,772 hours, 5,261 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Lru
Condition: Malfunctioned
Stage of operation: NR
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

FMC PROMPT INTERMITTENT LEFT AND RIGHT FMCS VTK FLAG DISPLAYED. GROUNDED - YES. ACCOMPLISHED LEFT FMC COMPUTER SYSTEM BITE PROCEDURE REF B737-900 FIM 34-61 TASK 801. NO FAULTS WERE LOGGED. PERFORMED FMC OPERATIONAL TEST B737-900 AMM TASK 34-61-00-710-801. SYS OPS TEST NML. ACCOMPLISHED DFCS INFLT FAULT REVIEW REF FIM 22-11 TASK 801. FOUND ONLY 1 FAULT FMC MS 22-11822 LOGGED. NO OTHER FAULTS LOGGED. PERFORMED DFCS LRU REPLACEMENT TEST FOR FMC. ALL TESTS PASSED. CLEARS MEL 34-36J.