Service difficulty report · Transmitter · Boeing 737990ER

Difficulty date
August 2, 2016
Submitted
August 4, 2016
Operation
Air carrier
Aircraft
N483AS
Make and model
Boeing 737990ER
Aircraft serial
36350
Aircraft time
3,603 hours, 1,208 cycles
Part
Transmitter
Part number
H504C
Part serial
154594
Condition
Failed
Location
Rt Wing
Part time
3,602 hours, 1,207 cycles
Stage of operation
IN
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

WHILE PERFORMING LWMP TRAINING, DFCS LIBRARY TEST NR 31 FAILS FOR CHANNEL B SPOILER POSITION SENSOR 9 AND DFCS SENSOR VALUES SHOWS NO INPUT TO FCC-B FROM SPOILER NR 9 POSITION SENSOR. ACFT GROUNDED. REF WDM 22-11-31-4 AT M930 SPOILER 9 POSITION SENSOR, SWAPPED THE CHANNEL A AND CHANNEL B OUTPUT CONNECTORS, D40034. PROBLEM FOLLOWED B OUTPUT. RETURNED CONNECTORS TO ORIGINAL POSITIONS. R & R M930 SPOILER 9 POSITION SENSOR IAW AMM 22-11-27-000-801 AND 22-11-27-400-801. PERFORMED SENSOR ADJUSTMENT IAW AMM 22-11-27-820-801 AND SENSOR TEST IAW AMM 22-11-27-710-801, INCLUDING DFCS LIBRARY TEST NR 31. ALL TESTS PASSED.