Service difficulty report · Fmc · Boeing 777300ER

Difficulty date
December 15, 2025
Submitted
December 18, 2025
Operation
Air carrier
Aircraft
N2138U
Make and model
Boeing 777300ER
Aircraft serial
62649
Aircraft time
36,138 hours, 3,874 cycles
Part
Fmc
Part number
4917740
Part serial
108150117
Condition
Failed
Location
Zone 100
Part time
36,123 hours, 3,873 cycles
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

SHORTLY AFTER T/O L FMC FAILURE. ACCOMPLISHED NON-NORMAL. NO HEL P FMC AND DISPLAY UNIT ORDERED TO B29. NO FMC FAULTS AT CURRENT TIME OR IN RECENT HISTORY. ACOMPLISHED FMC OPERATIONAL TEST AND SYSTEM TEST REF AMMS 34-61-00-710-801 AND 34-61-00-730-801. INCLUDING BOTH AIMS' OPERATIONAL TEST/ RESET REF AMM TASK 31-41-00-710-801.NO FAULTS. REINSTALLED NAV COMPUTER, PRIMA IAW AMM TASK 34-61-00-470-801. FMC IS NOT A INDIVUAL UNIT TO BE INSTALLED. REF SDS 34-61-00-002. PER MANAGEMENT REQUEST INSTALLED LEFT PFC PER AMM TASK 27-02-01-000/400-801. S/W AND OPS TESTS GOOD. NO PFC FAULTS.

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