Service difficulty report · Engine · Boeing 7378

Difficulty date
October 20, 2025
Submitted
October 21, 2025
Operation
Air carrier
Aircraft
N27270
Make and model
Boeing 7378
Aircraft serial
67525
Aircraft time
11,109 hours, 3,839 cycles
Engine
Cfmint LEAP1B28
Part
Engine
Condition
Inoperative
Location
Nr 1
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

NUMBER 1 ENG WILL NOT START. OBSEVATION OF FLT CREW ATTEMPTING TO START NR 1 ENG. APU PRESSURE NORMAL. N2 INCREASED NORMALLY, N 1 INCREASED NORMALLY, FUEL FLOW STAYED AT 0.40 & NEVER INCREASED, EGT CLIMBED TO 500 DEGREES & REMAINED AT THAT TEMP. GROUND CREW OBSERVED HEAVY VAPORIZED FUEL EXITING EXHAUST WHILE ENG WAS MOTORING. AFTER ABORTED START A IGNITION CHK PERFORMED ON BOTH ECC CHANNELS OPS CKS GOOD. PERFORMED E1 IDLE TEST IAW AMM 71-00-00-700-808-G00. TEST ENG HUNG START AT 41.9 N2, .041 FF, 567 EGT. SHUT ENG DOWN. 2ND ATTEMPT TO CROSSBLEED START USING E2 AS BLEED SOURCE. E1 CONTINUED TO HANG AT 45.8 N2, BUT WAS APPROACHING HOT START AT 719C PRIOR TO CUT OFF. NO CORRELATING FAULTS RECORDED. E1 FUEL NOZZLES 7,8,9,&10 TO BE REPLACED. BEGAN REMOVAL OF E1 FUEL NOZZLES 7,8,9,&10 REF AMM 73-11-05. NOZZLES 7, AND 8 LOOSE IN PLACE. NOZZLE 9 REMOVED UP TO STEP P.(3), NOZZLE 10 REMOVED UP TO STEP Q. (3). COMPLETED REMOVAL OF # 7, 8, & 9 FUEL NOZZLE PER AMM 73-11-05. REMOVED # 10 FUEL NOZZLE PER AMM 73-11-05, WITH TUBING BRACKETS AND HARDWARE. PERFORMED ENG. START OF #1 ENG. OPERATION NORMAL AT THIS TIME . OBSERVED ENGINE DRY MOTOR, WET MOTOR, AND IDLE RUN. NO LEAKS NOTED. REFERENCE GMM 09-10-05.

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