Service difficulty report · Servo Motor · Boeing 737890

Difficulty date
February 4, 2019
Submitted
February 7, 2019
Operation
Air carrier
Aircraft
N585AS
Make and model
Boeing 737890
Aircraft serial
35683
Aircraft time
43,743 hours, 13,110 cycles
Part
Servo Motor
Part number
305RAA1
Part serial
AS09712
Condition
Faulty
Location
Autothrottle Sys
Part time
15,542 hours, 4,772 cycles
Stage of operation
NR
How discovered
O
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

AUTOTHROTTLE SWITCH WILL NOT ENGAGE. GROUNDED - YES. A/T BITE REF FIM 22-31-00-810-801. NO CURRENT FAULTS, HISTORY SHOWS LEG 07, AND LEG 10 WITH 30 ASM-1 FAULTS. MESSAGES: 22-315011 22-31687. REMOVED AND REPLACED ASM-1. ALL REQUIRED TESTS PASSED. REF AMM 22-31-91/401.