SDR ASAA2020102333408

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: October 23, 2020
Submitted: October 26, 2020
Operation: Air carrier
Aircraft: N433AS
Make and model: Boeing 737990ER
Aircraft serial: 41704
Aircraft time: 26,946 hours, 8,606 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Captain'S
Stage of operation: DE
How discovered: O
Nature of condition: P
Precautionary procedure: O

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

What was found

PRIOR TO TOP OF DESCENT CAPTAIN'S FMC DISPLAY WENT BLACK. FMC DATA DID A BITE TEST. FMC SCREEN RETURNED TO NORMAL OPERATIONS. GROUNDED-YES. ACCOMPLISHED FMCS BITE PROCEDURE B737-900 FIM 34-61 TASK 801, NO FAULTS FOUND, OPERATIONS CHECK NORMAL.