SDR ASAA2022110140870

Service difficulty report · Sensor · Boeing 7379

Difficulty date: November 1, 2022
Submitted: November 21, 2022
Operation: Air carrier
Aircraft: N977AK
Make and model: Boeing 7379
Aircraft serial: 43391
Aircraft time: 1,167 hours, 360 cycles
Engine: Cfmint LEAP1B28
System (JASC): 7710 · Power Indicating System
Part: Sensor
Part number: 3224KGBA2
Part serial: HG0761027
Condition: Faulted
Location: #1 Engine
Part time: 4,395 hours, 1,264 cycles
Stage of operation: IN
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

WHILE PERFORMING ASA T.C. #05-020-01, #1 ENG HAS SMT MTX MSG PRESENT "ENG 1 EEC C2", WITH CORRELATED MTX MSG 73-44632: FAN SPEED (N1) SENSOR LOW TOOTH SIGNAL IS INVALID, IN FAULT HISTORY. GROUNDED - YES. REPLACED N1 SENSOR, REF B737-9 AMM 77-12-01-401.

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