# SDR DALA2017122108792

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2017
- Submitted: December 21, 2017
- Operation: Air carrier
- Aircraft: [N878DN](https://openairdocs.org/aircraft/N878DN), registered now
- Make and model: Boeing 737932ER
- Aircraft serial: 31989
- Aircraft time: 1,854 hours, 686 cycles
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Control Panel
- Condition: Failed
- Location: Transponder
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2017122108792

## Discrepancy

DURING TAXI OUT BOTH TRANSPONDERS 1 AND 2 FAILED. A BURNING ODOR WAS NOTED IN THE FLIGHT DECK WITH GPS LEFT FAILURE AND BOTH CLOCKS BLANK. AIRCRAFT RETURNED TO GATE. MAINTENANCE REMOVED AND REPLACED TRANSPONDER PANEL IAW AMM 34-53. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE.

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