SDR ASAA2022011337141

Service difficulty report · Unknown · Boeing 7379

Difficulty date: January 13, 2022
Submitted: January 15, 2022
Operation: Air carrier
Aircraft: N921AK
Make and model: Boeing 7379
Aircraft serial: 43337
Aircraft time: 930 hours, 291 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Unknown
Part number: UNKNOWN
Condition: Unknown
Location: Unknown
Stage of operation: NR
How discovered: V
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

CAPTAINS HEADING DISPLAY ON THE NAV DISPLAY FLUCTUATES 1-5 DEGREES. GROUNDED - YES. DURING INITIAL EVALUATION, FOUND NO ADIRU FAULTS LOGGED ON CDU, NO FAULTS LOGGED ON OMF EXISTING FAULTS RELATED TO ADIRU OR FMC 1, COULD NOT ENTER DFCS BITE WITH SWITCH SET TO FMC ON LEFT, WITH SWITCH SET TO RIGHT FOUND 75 FAULTS LOGGED FOR PREVIOUS FLIGHT CODE FAULT 22-11822. RESET FMC 1 AND PERFORMED B737-9 IFIM TASK 22-11-00-810-C15 FOR FMC DATA INV. ALL LIBRARY TESTS 18 &10 PASS ONCE FMC 1 CAME BACK ONLINE.

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