Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date
April 17, 2013
Submitted
April 23, 2013
Operation
Air carrier
Aircraft
N536AS
Make and model
Boeing 737890
Aircraft serial
35203
Aircraft time
5,006 hours, 1,434 cycles
Part
Autothrottle Sys
Part number
305RAA1
Part serial
AS06021
Condition
Faulty
Part time
7,943 hours, 2,590 cycles
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

AUTOTHROTTLES WILL NOT REMAIN ENGAGED. A/T BITE SHOWS NUMEROUS ASM-2 FAULTS (22-31688 RATE MONITOR). REPLACED NR 2 AUTO THROTTLE SERVO MOTOR REF AMM TASK 22-31-91, OPS CHECKED NORMAL. ACCOMPLISHED A/T OPS TEST REF AMM 22-31-00/501 AND DFCS GP 49 LAND VERIFY TESTS REF AMM 22-11-00, AND HGS TEST REF SMM 34-36-00, OPS CHECKED NORMAL.