SDR ASAA2022021737512

Service difficulty report · Fmc · Boeing 7379

Difficulty date: February 17, 2022
Submitted: February 23, 2022
Operation: Air carrier
Aircraft: N932AK
Make and model: Boeing 7379
Aircraft serial: 44089
Aircraft time: 310 hours, 111 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Part number: 1762000101
Part serial: 017541
Condition: Faulty
Location: Ee Rack, E5
Part time: 344 hours, 123 cycles
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

WHEN A/P A IS ENGAGED VNAV DISCONNECTS FMA DISPLAYS CWP REVERTS TO MCP SPD/LNAV/ALT HOLD. AMBER LOW A/S BAND CONT FLUCTUATES. A/P B OPERATES NORMAL, CAPT AMBER LOW A/S BAND CONT FLUCTUATES. GROUNDED - YES. REMOVED & REPLACED LEFT FMC REF B737-9 AMM 34-61-02 2 C/B OPEN & CLOSED, ALL INSTALLATION TEST PASS.

More about the Boeing 737-9