# SDR CALA2026042315655

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 21, 2026
- Submitted: April 23, 2026
- Operation: Air carrier
- Aircraft: [N17405](https://openairdocs.org/aircraft/N17405), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67647
- Aircraft time: 3,289 hours, 1,082 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Fseu
- Part number: 285A12004
- Part serial: 380
- Condition: Faulted
- Location: Flap Sys
- Part time: 3,284 hours, 1,080 cycles
- Stage of operation: LD
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026042315655

## Discrepancy

LE FLAP TRANSIT ON DURING LANDING. LE FLAP 2 SHOWS AMBER M&L UPDATE PER CREW INBOUND BRIEF LE FLAP 2 SHOWS AMBER IN APPROACH. MAINTENANCE LIGHT ILUMINATED UPON ARRIVAL, AFTER INTERROGATED OMF FOUND MAINTENANCE MESSAGE 27-81219. PHOTO OF OMF MAINT SCREEN ATTACHED. PER AHM FAULT HAS BEEN HITTING SINCE 17 APR LE FLAP 2 EXTEND SESNOR S171 P/N 80-207-01 SHOWS INSTOCK FIM 27-81 TASK 825 CHECK SENSOR 2 AND ADJUST REPLACE FSEU IF NO FAULTS FOUND WITH SENSOR FOLLOWED FIM: 27-81 TASK 825. PERFORMED LE FLAP AND SLAT TIMING TEST, SYSTEM OPERATES NORMAL. CHECKED THE LE FLAP 2 EXTENDED SENSOR (S171), DISPLAY AND PROXIMITY SENSORS STATES ON FSEU MATCHES THE TABLES AS SHOWN ON AMM:27-88-11-700-801. MAINTENANCE MESSAGE ON OMF SHOWS NOT ACTIVE. ALSO PERFORMED A VISUAL INSPECTION OF THE LE FLAP 2 EXTENDED SENSOR (S171) AND ITS WIRING ROUTING NO DAMAGE NOTED. REFER TO LP: 8636249 FOR FSEU REPLACEMENT AS PRECAUTIONARY

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