Service difficulty report · Switch · Boeing 737990ER

Difficulty date
May 8, 2020
Submitted
May 11, 2020
Operation
Air carrier
Aircraft
N431AS
Make and model
Boeing 737990ER
Aircraft serial
43255
Aircraft time
25,680 hours, 8,301 cycles
Part
Switch
Part number
251A44304
Condition
Failed
Location
Control Column
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

REF L/P 12301081. DURING ACCOMPLISHING LAND VERIFY (AUTOLAND) FAULT MSG 22-11125. GROUNDED - YES. VERIFIED FAULTS 22-11125 AND 22-11126 DURING BITE LIBRARY TEST 60.32. REPLACED THE ELEVATOR SENSOR REF B737-900 AMM 22-11-30/401. COMPLETED ADJUSTMENT. NO HELP TO ORIGINAL DEFECT. REPLACED F/O'S COLUMN CUTOUT SWITCH M1201 REF AMM 27-41-51/401. ADJUSTMENT AND OPS CHECK GOOD. ACCOMPLISHED INSTALLATION TEST OF THE ELEVATOR POSITION SENSOR IAW AMM 22-11-30-820-801. GROUND VERIFICATION TESTS ARE GOOD.