# SDR UPS04M42832

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2004
- Submitted: August 13, 2004
- Operation: Air carrier
- Aircraft: [N254UP](https://openairdocs.org/aircraft/N254UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Transponder
- Part number: 1751780010004
- Part serial: 00122947
- Condition: Inoperative
- Location: E/E Bay Atc
- Stage of operation: CR
- How discovered: O
- Nature of condition: S
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS04M42832

## Discrepancy

INSPECTION TYPE:N/A, DIVERSION - BOTH ATC TRANSPONDER MODE C FUNC INOP.  ATC REQUIRED DIV TO STN.  *S/D*  SWAPPED POSITIONS OF ATC TRANSPONDERS IAW 34-54-01.  PERFORMED BITE CHECK ON BOTH ATC TRANSPONDERS CHECKED OK AS PER AMM 34-54-00 (OPERATIONAL TEST) POSITIONS OF X-PONDERS ATC 2 P/N 7517800-10004.

---
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.