# SDR DALA2017103007844

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2017
- Submitted: October 30, 2017
- Operation: Air carrier
- Aircraft: N909DE
- Make and model: Doug MD-88
- Registry model: [Doug MD-88](https://openairdocs.org/model/mcdonnell-douglas-md-88) (OpenAirDocs)
- Aircraft serial: 53418
- Aircraft time: 62,198 hours, 48,403 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Switch
- Condition: Failed
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2017103007844

## Discrepancy

WHEN MOVING THE VOLT/FREQ SELECTOR KNOB IT STARTED SMOKING. THE VOLTS AND FREQ METERS INCREASED A LITTLE THEN DROPPED TO ZERO.  THE SMOKE STOPPED. COMPLIED WITH  ODI CHECKLIST. INSPECTED ALL WIRING.  REPLACED THE SELECTOR SWITCH AND FREQ INDICATOR. CHECKED GOOD IAW AMM 24-00.  ACFT OK FOR SERVICE.

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