Service difficulty report · Servo · Boeing 737990ER

Difficulty date
May 26, 2013
Submitted
May 29, 2013
Operation
Air carrier
Aircraft
N419AS
Make and model
Boeing 737990ER
Aircraft serial
41734
Aircraft time
548 hours, 170 cycles
Part
Servo
Part number
305RAA1
Part serial
AS09128
Condition
Failed
Location
Throttle
Part time
556 hours, 173 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

AUTOTHROTTLE WILL NOT ARM. ACFT GROUNDED. AUTOTHROTTLE HISTORY SHOWED ASM-1 FAILURE. AUTOTHROTTLE CURRENT STATUS GOOD BUT AUTOTHROTTLE SERVO TEST FAILED ASM-1 REF MM 22-31-00, SYS TEST, CONFIRMED FAULT. REPLACED ASM-1. RESET C/B AND OPS NORMAL. REF MM 22-31-91. CONFIRMED GROUND VERIFICATION GOOD. NO HISTORY LAST 30 DAYS.