Service difficulty report · Fmc · Boeing 7378H4

Difficulty date
June 19, 2026
Submitted
June 23, 2026
Operation
Air carrier
Aircraft
N8570W
Make and model
Boeing 7378H4
Aircraft serial
36952
Aircraft time
26,929 hours, 13,928 cycles
Part
Fmc
Condition
Faulted
Location
Zone 100
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

INACCURATE FMC FUEL PREDICTIONS AND FMC NR 2 FAILURE IN FLIGHT. FMC ARRIVAL FUEL 1.5LBS BELOW REQUIRED FUEL. FMC USING RESERVE FUEL WARNINGS. PERFORMED FUEL QTY DRIP STICK READINGS IAW AMM 28-41-00. #1 TANK HAD 3020 LBS AND STICK 3 READ 8.4. NR 2 TANK HAD 3360 AND STICK 3 READ 9.6. BOTH READS ARE CORRECT. SUSPECT PROBLEM IS WITH THE NR 2 FMC. OK TO CONTINUE NR 2 FMC ON MEL 34-36-01; SP1. REPLACED NR 2 FMC COMPUTER IAW AMM 34-61-02.

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