Service difficulty report · Switch · Boeing 737522

Difficulty date
April 21, 1999
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N930UA
Make and model
Boeing 737522
Aircraft serial
26655
Engine
Ge CFM56*
Part
Switch
Condition
Failed
Location
Stab Trim
Component
65C255296
Stage of operation
CL
Nature of condition
F
Precautionary procedure
A

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

What was found

ELECTRIC STABILIZER TRIM IS INOP. FOUND THAT FLAP UPLIMIT SWITCH (S245) HAD A FAILED RESISTANCE (68+) WHEN MEASURED BETWEEN D4514P PINS 32 AND 34. THE SWITCH WAS REPLACED. LATER TROUBLESHOOTING FOLLOWING ANOTHER WRITE-UP FOR INOP STABILIZER TRIM FOUND THAT THE SYSTEM WORKED NORMALLY WHEN THE CUTOUT SWITCH WAS PUT IN OVERRIDE. ACCORDINGLY, THE M1201 COLUMN SWITCHING MODULE WAS REPLACED. OPS CHECK OK.