# SDR CALA2026072017892

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 15, 2026
- Submitted: July 20, 2026
- Operation: Air carrier
- Aircraft: [N73251](https://openairdocs.org/aircraft/N73251), registered now
- Make and model: Boeing 737824
- Aircraft serial: 30582
- Aircraft time: 78,185 hours, 29,296 cycles
- System (JASC): [2781 · Leading Edge Slat Position Indicating System](https://openairdocs.org/jasc/2781)
- Part: Sensor
- Part number: 189929
- Condition: Faulted
- Location: Flap System
- Stage of operation: CL
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026072017892

## Discrepancy

CREW REPORTS LEADING EDGE FLAP TRANSIT LIGHT AFTER TAKEOFF. OVERHEAD INDICATOR FOR NR 3 LEADING EDGE FLAP INDICATING NOT RETRACTED. FOLLOWED FIM 27-88 TASK 820 AND COMPLETED FSEU BITE CHECK, PASSED.  LOOKED AT PREVIOUS FAULT HISTORY LEG 0 HISTORY SHOWS F3 PROX RETRACT MAINT MESSAGE 27-81220. WHICH VALIDATES PILOT WRITE UP. PILOT BROUGHT AICRT TO GATE WITH FLAPS DOWN PLACED FLAPS BACK TO POSITION 0 WITH NO FAULTS AT THIS TIME. IAW AMM 27-88-11-400-802 STATES THAT THE RETRACT SENSOR IS NON ADJUSTABLE STAINLESS STEEL AND (5) FOR TITANIUM. DUE TO F3 PROX RETRACT MAINT MESSAGE 27-81220 ACCOMPLISHED STEPS E. THRU F.(1)(F) OF FIM 27-88 TASK 805. NO CURRENT FAULTS FOUND, LOOKED AT HISTORY FOUND SAME MESSAGE AS BEFORE ON FSEU. EXTENDED & RETRACTED SLATS, MOVEMENT WAS SMOOTH AND EVEN ON BOTH SIDES. REPLACED NR 3 LEADING EDGE FLAP RETRACT SENSOR (S172) AS A PRECAUTION IAW MM 27-88-11-400-802,  PERFORMED LEADING EDGE FLAP & SLAT PROXIMITY SENSOR TEST IAW AMM 27-88-11-700-801. CHECKED SENSOR FOR F3 RETR. WITH FLAP CONTROLLER LEVER IN RETRACT, OPSERVED GAP NEAR. WITH LEVER AT 1 UNIT, OBSERVED GAP FAR. WITH LEVER AT 10 UNIT OBSERVED GAP FAR . INDICATOR AND OPS CHECK WERE GOOD AT THIS TIME.

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