# SDR CALA2026101520401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2026
- Submitted: October 15, 2026
- Operation: Air carrier
- Aircraft: [N77578](https://openairdocs.org/aircraft/N77578), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67613
- Aircraft time: 10,043 hours, 3,274 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Transmitter
- Part number: 90004531
- Part serial: 1810
- Condition: Faulted
- Location: Flap Sys
- Part time: 10,036 hours, 3,271 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026101520401

## Discrepancy

T/E FLAPS INDICATION FOR LT & RT FLAPS DO NOT AGREE,  TE FLAP ASSYM,   FLAPS SPLIT AT 5 DETENT,  MX MSG 27-52261, 27-52259, 32-62009 AND 32-62010. GEAR WARN SYS FAULTS MOST LIKELY DUE TO FLAP POSITION FAULTS.  CHKD RESISTANCE AT D00275 IAW WDM 27-52-11. RESISTANCE IS 5.6 OHMS. OUT OF LIMITS IAW FIM.  TRIED TO EXTENDE T/E FLAPS TO 40 UNITS IAW AMM 27-51-00-860-803. FLAPS DIDN'T MOVE WITH HYDS ON.  TRIED TO MOVE FLAPS WITH ALTERNATE MODE IAW AMM 27-51-00-860-802, DIDN'T MOVE.  R & R LT TRANSMITTER IAW AMM 27-58-01/401, OPS CHK FAILED.  SUSPECT FLAPS NOT TO BE ON STOPS.   REMOVED LT FLAP POSITION TRANSMITTER T427 FOR T/S IAW AMM 27-58-01-000-801. INSTALLED SAME TRANSMITTER, OPS CHK PASSED IAW AMM 27-32-00-740-803.

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