# SDR AALA2018111659009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 8, 2018
- Submitted: November 16, 2018
- Operation: Air carrier
- Aircraft: [N172AJ](https://openairdocs.org/aircraft/N172AJ), registered now
- Make and model: Boeing 757223
- Aircraft serial: 32400
- Aircraft time: 54,021 hours, 15,330 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Fseu
- Part number: 285N001140
- Part serial: D02420
- Condition: Faulty
- Location: Te Flaps
- Stage of operation: AP
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2018111659009

## Discrepancy

DURING APPROACH,  WHILE SELECTING FLAPS 15 TO FLAPS 20, ONE OF THE FLAP INDICATORS STAYED AT 15 FOR ABOUT 3 MINUTES AND THEN SNAPPED TO 20, NO ASSYMETRY FELT IN FLIGHT CONTROLS.   DECLARED AN EMERGENCY AND DID A GO-AROUND. FLAP INDICATOR WORKED NORMALLY WHEN FINAL FLAPS 25 WAS SELECTED.   THE AIRCRAFT WAS GROUNDED.  MAINTENANCE REMOVED AND REPLACED FSEU-1 M10331 OPS CHECKED NORMAL, IAW FIM 27-51-00-815-812 TASK 22, AND AMM 27-51-01, OK FOR SERVICE.

---
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.