Service difficulty report · None · Boeing 737

Difficulty date
September 2, 2022
Submitted
September 2, 2022
Operation
Air carrier
Aircraft
N23721
Make and model
Boeing 737
Aircraft serial
28940
Aircraft time
74,586 hours, 26,735 cycles
Part
None
Part number
NA
Condition
None
Location
Other
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

STAB OUT OF TRIM MSG DIS PLAYED. UNABLE TO USE EL EC TRIM NOSE U P OR OVERRIDE. PILOT STATED STAB OUT OF TRIM LIGHT EXTINGUISHED WHEN ELECTRIC DFCS BITE SHOWS NO FAULTS ON CURRENT LEG. LEG 02 SHOWS FAULTS, CUTOUT SWITCHES ACTIVATED. WAS ABLE TO TRIM MANUALLY. (SEE ATTATCHED PICTURE). CONFIRMED STAB TRIM NOSE UP FAILS ELECTRICALLY. NOSE DOWN OK. SWITCHED STAB TRIM TO OVERRIDE, STAB TRIM NOSE UP WORKS ELECTRICALLY. CURRENTLY OPS NORMAL IN NORMAL ADD EMP:U181099 OPERATION RETURNED. SUSPECT SWITCH S144 NOSE UP LIMIT INTERMITTENT. STARTED REPLACING S144, INSTALLED AND CONNECTED, STILL NEEDS RIG ADJUSTMENT AND SAFETY AND TEST PER MM 27-41-94. REF FIM 22-11 TASK 851, STAB OUT OF TRIM LIGHT ON PER CREW, S144 WIRE HARNESS STILL NEEDS FINAL TIESTRAPS AND CLAMPED IN SAFETIED JAMB NUT ON S144 AND SECURED WIRE BUNDLES AND CLAMPS. PERFORMED DFCS BITE CH A STAB TRIM TEST FAILED WOULD NOT TRIM PLACED AFTER S844 REPAIR. NEEDS ADJUSTMENT AND TEST PER AMM 27-41-94-820-801/700-801. NOSE UP, CYCLED CUTOUT AND OVERRIDE NO HELP. MANUALLY MOVED TRIM WHEEL A FEW TURNS NOSE UP AND ELECTRIC TRIM NOSE UP ADD EMP:217867 COMPLETED INSTALLATION, ADJUSTMENT AND TEST OF S144 REF: AMM 27-41-94. OPS CHECK GOOD. TESTS PASSED. PERFORMED LIBRARY BITE TEST 60.32 (SPEED/STAB TRIM SURFACE TEST) REF: AMM 22-11-00. TEST AND OPS CHECKS GOOD. ADD EMP:U375133,U104705