# SDR DALA2022062104344

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 18, 2022
- Submitted: June 21, 2022
- Operation: Air carrier
- Aircraft: [N821DX](https://openairdocs.org/aircraft/N821DX), registered now
- Make and model: Boeing 757-26D
- Registry model: [Boeing 757-26D](https://openairdocs.org/model/boeing-757-26d) (OpenAirDocs)
- Aircraft serial: 33961
- Aircraft time: 48,973 hours, 23,095 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Pressure Switch
- Condition: Faulty
- Stage of operation: AP
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2022062104344

## Discrepancy

SHIP 6821- MISC/DE - ON FINAL APPROACH WHEN ATTEMPTING TO EXTEND FLAPS TO 25 THE FLAP ASYMMETRY MSG ILLUMINATED ALONG WITH TRAILING EDGE LIGHT. CORRECTIVE ACTION: MTC FOUND FAULT FLAP ISLN VALVE MSG PRESENT. REPLACED DECOMPRESSION MODULE PRESSURE SWITCH.

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