# SDR CALA2026102320535

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2026
- Submitted: October 23, 2026
- Operation: Air carrier
- Aircraft: [N15712](https://openairdocs.org/aircraft/N15712), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28783
- Aircraft time: 84,613 hours, 30,615 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Warning Light
- Condition: False Activation
- Location: Zone 500
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026102320535

## Discrepancy

LE TRANSIT LIGHT ON WITH FLAPS 5. LT OTBD AMBER LIGHT ON OVERHEAD INDICATOR CREW DEBRIEFED FLAP TRANSIT LIGHT STAYED ON AND WOULD NOT COMPLETE TRANSIT MOVEMENT FROM FLAP 15. PILOTS WENT THROUGH CHECKLIST, WOULD NOT COMPLETE MOVEMENT, TRANSIT LIGHT WOULD NOT EXTINUISH. ONLY LT OTBD AMBER LIGHT ON OVERHEAD FLAP INDICATOR STAYED ILLUMINATED DURING FAULT. AFTER AIRCRAFT LANDING DURING TAXI IN, FLAP TRANSIT LIGHT EXTINGUISHED & FLAPS COMPLETED TRAVEL TO POSITION 15. FOUND FAULT MESSAGE SL1 PROX INBD (27-81201) IN FH LEG 0. PERFORMED GVI OF SLAT 1 PROX SENSORS, NO DEFECTS NOTED. EXTENDED AND RETRACTED FLAPS/SLATS MULTIPLE TIME, COULD NOT DUPLICATE FAULT. REMOVED FSEU REF AMM 27-51-01-000-801, AND RANG OUT SLAT  1 PROX SENSOR PER FIM 27-88 TASK 804. PROX SENSOR RANG OUT OK. REINSTALLED FSEU IAW AMM 27-51-01-400-801, OPS TESTED OK. UNABLE TO DUPLICATE FAULT OR FIND ANY DEFECTS AT THIS TIME.

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