SDR ASAA2023072544232

Service difficulty report · Switch · Boeing 737990ER

Difficulty date: July 25, 2023
Submitted: July 28, 2023
Operation: Air carrier
Aircraft: N434AS
Make and model: Boeing 737990ER
Aircraft serial: 61620
Aircraft time: 27,245 hours, 8,451 cycles
System (JASC): 8000 · Engine Starting System
Part: Switch
Part number: 66002849
Condition: Faulty
Location: #1 Engine
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

REF. T/C 78273000 #1 ENG. HAS FAULT MESSAGE 73-303111 " THE START SWITCH SIGNAL AND ARINC BUS DATA DISAGREE" SHORT TIME FAULT. GROUNDED - YES. (RESOLVED ON W/O: 1963379 TASKCARD: N/R-00001 ) FAULT PRESENT ON EVERY LEG INCLUDING LEG 0, REPLACED #1 START SWITCH REF AMM 80-11-00 1 C/B OPEN & CLOSED. START SWITCH TEST PASS REF AMM 80-11-00-730-801-F00 FAULT HAS MOVED OFF LEG 0.PLT CLEARED SEAMC DARWIN NOTIFIED.