SDR ASAA2023090845000

Service difficulty report · Switch · Boeing 737890

Difficulty date: September 8, 2023
Submitted: September 11, 2023
Operation: Air carrier
Aircraft: N529AS
Make and model: Boeing 737890
Aircraft serial: 35198
Aircraft time: 47,296 hours, 14,016 cycles
System (JASC): 8010 · Engine Cranking
Part: Switch
Part number: 66002849
Condition: Faulty
Location: Flight Deck
Stage of operation: TX
How discovered: V
Nature of condition: O
Precautionary procedure: K

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

What was found

#1 START SWITCH DID NOT CUTOUT AT 56 % N2 ON INITIAL START. GROUNDED - YES. T/S IAW FIM 80-07 TASK 808 & START SW RELEASE W/ C/B PULLED. S266 X1-DP3973B H4 - 2.2 OHMS. S266 X1-DP3975B H4 2.2 OHMS. S266 X1 - A/C GND - 1.9 MEGOHMS. FURTHER T/S SUSPECT #1 ENG START SWITCH. REMOVED AND REPLACED #1 ENG START SWITCH & OPS CK NML IAW AMM 80-11-00. CLEARS MEL 80-2B. PLACARDS REMOVED. SEAMC JOE. ENG STARTER C/O @ 55% N2.