Service difficulty report · Exciter · Boeing 737990ER

Difficulty date
April 5, 2015
Submitted
April 7, 2015
Operation
Air carrier
Aircraft
N459AS
Make and model
Boeing 737990ER
Aircraft serial
36352
Aircraft time
4,081 hours, 1,354 cycles
System (JASC)
7412 · Exciter
Part
Exciter
Part number
9238M66P11
Part serial
UNL50149
Condition
Failed
Location
Nr 1 Engine
Part time
4,091 hours, 1,359 cycles
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
D

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

What was found

DURING ENGINE START NR 1 ENGINE FAILED TO START. NO EGT RISE. ACFT GROUNDED. UNABLE TO CONFIRM FAULT. REPLACED NR 1 ENGINE LT IGNITION EXCITER, M421, AS PRECAUTIONARY REF AMM TASK 74-11-01. REPLACED NR 1 ENGINE LT MAIN IGNITER PLUG, REF AMM TASK 74-21-02. ACCOMPLISHED NR 1 ENGINE LT IGNITION SYSTEM AUDIBLE TEST REF AMM TASK 74-00-00 & NR 1 ENGINE RUN-UP, OPS CK NORMAL. PLACED IGNITION SELECT SWITCH TO RT POSITION.