Service difficulty report · Module · Boeing 737890

Difficulty date
September 11, 2018
Submitted
September 14, 2018
Operation
Air carrier
Aircraft
N530AS
Make and model
Boeing 737890
Aircraft serial
36578
Aircraft time
33,029 hours, 9,813 cycles
Part
Module
Part number
285A10109
Part serial
285A1010D06989
Condition
Failed
Location
E&E Bay
Part time
33,054 hours, 9,822 cycles
Stage of operation
CR
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

APPROXIMATELY ONE HOUR INTO FLIGHT IN LEVEL CRUISE AT FL 360 THE A AUTOPILOT DISENGAGED. WAS ABLE TO REENGAGE A AUTOPILOT. AFTER TEN SECONDS A AUTOPILOT AGAIN DISENGAGED. SWITCH TO B AUTOPILOT WITH NORMAL OPERATION. GROUNDED - YES. PERFORMED DFCS BITE REF FIM 22-11 TASK 801. NO FAULTS CURRENT STATUS. FLIGHT DECK EFFECT FOR THIS FL SHOWED TWO FAULTS BOTH "NO SMYD DATA" MSG 22-11081. INTERMITTENT FAULT REF INITIAL EVAL FIM 22-15 TASK 801. SMYD BITE REF FIM 27-32 TASK 801 SHOWED NO EXISTING FAULTS AND FAULT HISTORY SHOW NO FAULTS FOR THIS FLIGHT LEG. DUE TO HISTORY REMOVED AND REPLACED NR 1 SMYD PER AMM 27-32-42. ALL TESTS NORMAL.