# SDR CALA2026070617558

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 2, 2026
- Submitted: July 6, 2026
- Operation: Air carrier
- Aircraft: [N37290](https://openairdocs.org/aircraft/N37290), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31601
- Aircraft time: 67,463 hours, 25,234 cycles
- System (JASC): [2781 · Leading Edge Slat Position Indicating System](https://openairdocs.org/jasc/2781)
- Part: Sensor
- Part number: 878802
- Condition: Faulted
- Location: Slat Sys
- Stage of operation: AP
- 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/CALA2026070617558

## Discrepancy

LE FLAPS TRANSIT NO.4 LE DEVICE IN  TRANSIT. PERFORMED FSEU BITE. GOT MESSAGE FOR MOST RECENT FLIGHT F4 PROX RETRACT MM 27-81222. REF FIM 27-88 TASK 805, CHECKED CURRENT STATUS OF F4 RETR PROX SWITCH SHOWED NEAR. HISTORY OF THIS MESSAGE ON MULTIPLE FLIGHT LEGS. SEE LOGPAGES 9014722, 9039056. FSEU AND F4 RETRACT SENSOR HAVE PREVIOUSLY BEEN REPLACED. FOLLOWING FIM 27-88 TASK 805 FLAP RETRACT PROXIMITY SENSOR DISAGREE PROBLEM - FAULT, STATE OF THE PROXIMITY SENSORS WAS NOT MARGINAL ALL SHOWING NEAR OR FAR STATE RAN THROUGH FULL RANGE OF EXTENTION AND RETRACKION OF SLATS AND FLAPS, COULD NOT DUPLICATE ISSUE AMM  27-88-11-700-801 LEADING EDGE FLAP AND SLAT PROXIMITY SENSOR TEST FOLLOWING FIM 27-88 TASK 805 FLAP RETRACT PROXIMITY SENSOR DISAGREE PROBLEM - FAULT, REPLACED LE FLAP RETRACT SENSOR FOR SLAT #4 AMM 27-88-11, AMM 27-88-11-700-801 LEADING EDGE FLAP AND SLAT PROXIMITY SENSOR TEST PASSED, OK FOR SERVICE.

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