Service difficulty report · Control Switch · Boeing 737824

Difficulty date
July 28, 2025
Submitted
July 29, 2025
Operation
Air carrier
Aircraft
N36280
Make and model
Boeing 737824
Aircraft serial
31598
Aircraft time
62,746 hours, 23,144 cycles
Part
Control Switch
Part number
1SX1H58
Condition
Faulted
Location
Thrust Reverser
Stage of operation
LD
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

ENG 2 REV THRUST STICKY ON LANDING. PERFORM THE BITE TEST ON 2 ENGINE REV THE EAU FOUND ONLY ONE FAULT T/R DELOY FAULT DID THE NORMAL OPS TEST SYSTEM WORK UNTIL NOTICE AFTER YOU DELOYED THE HANDLE TO FULL DELOY THE T/R DOES NOT DELOY AND YOU GET THE REV LIGHT BUT WHEN YOU GO BACK A FEW INCHES SHORT OF FULL DELOY T/R DELOYED AND STOWED WITHOUT A PROBLEM SUSPECT THE SWITCHPACK SWITCH IS BAD I NEED MORE TROUBLESHOOTING REF AMM 78-31-00-700-801-F00 AND FIM 78-34 TASK 810 . PERFORM SYNC LOCK OPERATION TEST AND THE TEST PASS REF AMM 78-31-00-700-803-F00. CYCLED ENG 2 T/R. FIRST CYCLE IT DEPLOYED APPROX 3-5 INCHES THEN STOWED IMMEDIATELY W/O MOVING LEVER TO STOW. EVERY CYCLE AFTER T/R FULLY DEPLOYED AND STOWED CORRECTLY. PERFORMED EAU BITE, PICTURES ATTACHED. REF FIM 78-32 TASK 806 FAULT ISOLATION, PERFORMED SPRING FREE ANGLE CHECK. SPRING IS OUT OF LIMITS. GAINED ACCESS TO CONTROL SWITCH IN ENG 2 THRUST LEVER REF AMM 78-34-04. SUSPECT SWITCH WAS INSTALLED OR WIRED BACKWARDS. ACTUATOR BUTTON WAS AFT, AMM/AIPC SHOWS ACTUATOR BUTTON FWD. WIRING COMPLETED INSTALL OF ENG 2 TR CONTROL SWITCH REF AMM 78-34-04 THROUGH END OF TASK. OPS CHECK GOOD NO FAULTS NOTED AT THIS TIME. OPERATED ENG 2 TR WITH ENGINE RUNNING NO FAULTS NOTED REF LP 5723511 FOR TRA FLUCTUATIONS.