# SDR 97UAL900475

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 17, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N642UA](https://openairdocs.org/aircraft/N642UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25092
- Engine: Pwa PW4060
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Bypass Valve
- Part number: 7321856005
- Condition: Failed
- Location: Te Flap
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900475

## Discrepancy

WHEN RETRACTING FLAPS, TE DISAGREE MSG APPEARED WHEN FLAP HANDLE WAS MOVED FROM 5 DEG TO 1 DEG.  RETURNED TO JFK.  *S/D*  A FAULTY TRAILING EDGE FLAP POWER DRIVE UNIT BYPASS VALVE PREVENTED AFT FLAPS FROM RETRACTING TO THE COMMANDED POSITION.  THE FLAP/SLAT ELECTRONICS UNIT SENSED THE DISAGREEMENT BETWEEN THE FLAP LEVER POSITION AND FLAP POSITION AND DROVE THE 'T/E FLAP DISAGREE' CAUTION ALERT MSG TO APPEAR ON EICAS AND THE 'TRAILING EDGE' AMBER LIGHT TO ILLUMINATE.  THE BYPASS VALVE ON THE T/E FLAP PDU CONTROL VALVE WAS REPLACED AND TESTED AND THE FLAP/SLAT SYSTEM OPS CHECKED AND VERIFIED NORMAL PER MM.

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