Service difficulty report · Fault Code · Boeing 737990ER

Difficulty date
June 14, 2020
Submitted
June 22, 2020
Operation
Air carrier
Aircraft
N434AS
Make and model
Boeing 737990ER
Aircraft serial
61620
Aircraft time
16,447 hours, 5,162 cycles
Part
Fault Code
Condition
False Indication
Stage of operation
IN
How discovered
O
Nature of condition
N
Precautionary procedure
K

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

What was found

UPON INTERROGATING THE FMC CDU FOR ENGINE FAULTS, FOUND MSG NBR 75-30802. T25 SIGNALS DISAGREE. GROUNDED - YES. FOLLOWED B737-900 FIM TASK 75-33 TASK 805. ENGINE 2 PASSED EEC BITE (FIM 73-00 TASK 801). T25 SENSORS RESISTANCES ARE WITHIN LIMITS LISTED, J9 AND J10 HARNESS (AT EEC) HAVE RESISTANCES THAT ARE IDENTICAL TO T25 SENSOR RESISTANCES AND ARE WITHIN LIMITS. CHECKED THE T25 INPUTS AT MCDU AND THE INPUTS ARE IDENTICAL. AT THIS TIME THERE ARE NO ACTIVE FAULTS AND NO DAMAGED OR FAULTY HARNESSES AT THIS TIME. GROUND VERIFICATION TESTS GOOD.