SDR ASAA2017071021347

Service difficulty report · Switchpack · Boeing 737990ER

Difficulty date: July 10, 2017
Submitted: July 12, 2017
Operation: Air carrier
Aircraft: N431AS
Make and model: Boeing 737990ER
Aircraft serial: 43255
Aircraft time: 14,714 hours, 4,852 cycles
System (JASC): 2230 · Auto Throttle System
Part: Switchpack
Part number: 254A115011
Condition: Failed
Location: Autothrottle
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

PSEU LIGHT ILLUMINATED. ACFT GROUNDED. TRA LT 53 FAULT CODE 31-52002 FOUND ON PSEU. CONFIRMED STATUS OF D10982 PIN 42 WOULD NOT CHANGE WITH THRUST LEVER MOVEMENT AS REQUIRED IAW FIM 32-09, TASK 815. REPLACED THE LT AUTOTHROTTLE SWITCH PACK M1766 AND AJUSTED IAW AMM 76-11-07. OPS NORMAL IAW AMM 76-11-07, 32-09-10, 32-42-00, 78-31-00, 30-11-00, 31-51-00, & 34-43-00. REPAIR CONFIRMATION OF FIM 32-09T815 CHECKED NORMAL.