# SDR CALA2026052016422

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 17, 2026
- Submitted: May 20, 2026
- Operation: Air carrier
- Aircraft: [N37449](https://openairdocs.org/aircraft/N37449), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67178
- Aircraft time: 422 hours, 147 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Fseu
- Part number: 285A12004
- Part serial: 747
- Condition: Faulted
- Location: Flap Sys
- Part time: 403 hours, 142 cycles
- Stage of operation: CL
- 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/CALA2026052016422

## Discrepancy

FLAPS STUCK AT 5 POSITIO AFTER GO AROUND. WOULD NOT MOVE NORMALL Y. HAD TO EXTEND TO 15 VIA ALTN PERFORMED FSEU BITE FOUND LATCHED MAINT MESSAGE 27-51351 TE FLAP UNCOMMANDD POSITION (UCM). PERFORMED INTIAL EVALUATION PER FIM TASK  27-51 TASK 802 UP TO STEP C(2).(C). C)  IF THE TRAILING EDGE FLAPS DO NOT MOVE WHEN YOU DISARM THE ALTERNATE CONTROL SYSTEM, THEN CONTINUE. DID RESET CBS FOR FSEU DC1 (P6-2 A8) AND FSEU DC2 (P6-2 A9). LATCHED MESSAGE BECAME INACTIVE. PERFORMED FLAP DETENT FROM UP TO FLAPS 40 WITH HYDRAULICS AND ALTERNATE FLAPS ARM OFF. MESSAGE DID NOT REPLICATE. FOLLOWING FIM NEXT STEP C(3). SIMULATE AN AIRSPEED OF MORE THAN 60 KNOTS TO FIND IF AN AIRSPEED INPUT CAUSES THE TRAILING EDGE FLAPS TO MOVE. THIS IS THE TASK: AMM TASK 34-21-00-730-802. DID NOT SPEAK WITH CREW ABOUT WHAT THE RECORDED AIRSPEED WAS WHEN ADD EMP:U104367 INCIDENT OCCURRED. REQUIRES FURTHER EVALUATION. REMOVED COPPER SAFETY WIRE FOR ALTERNATE FLAPS SWITCH FOR TEST PURPOSES. PLEASE REPLACE BEFORE NEXT FLIGHT. AS REQUESTED PERFORMED TASK 05-51-08-210-801 NO BINDING OF FLAPS TRAVEL OR DEFORMITIES TO FLAP SKIN TESTS COMPLETED OPS CHK NML REF AMM 05-51-08-210-801 ADD EMP:U432539AS PRECAUTIONARY PER TOMC REMOVED AND REPLACED FSEU IAM AMM 27-51-01-400-801. OPS CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.