Service difficulty report · Position Sensor · Boeing 737890

Difficulty date
January 4, 2019
Submitted
January 9, 2019
Operation
Air carrier
Aircraft
N512AS
Make and model
Boeing 737890
Aircraft serial
39043
Aircraft time
39,833 hours, 11,974 cycles
Part
Position Sensor
Part number
H504B
Part serial
AC00764
Condition
Failed
Location
Autopilot Sys
Part time
81,919 hours, 44,531 cycles
Stage of operation
AP
How discovered
O
Nature of condition
F
Precautionary procedure
O

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

What was found

A AUTOPILOT SELECTED AIRPLANE ROLLED HARD RIGHT A AUTOPILOT DISCONNECTED. B AUTOPILOT NORMAL. GROUNDED - YES. DFCS FAULT REVIEW RESULTED IN A CODE 22-11145 (AILERON POSITION FAIL FAULT). WHILE CHECKING AILERON POSITION SENSOR RIGGING, FOUND A LARGE SPLIT BETWEEN A AND B CHANNELS. REPLACED THE AILERON POSITION SENSOR PER AMM 22-11-29/401. OP-CHECKS GOOD PER SAME.