# SDR HYIA991AA

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2009
- Submitted: April 6, 2009
- Operation: Air carrier
- Aircraft: [N991AA](https://openairdocs.org/aircraft/N991AA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0317
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Master Switch
- Part number: CM358950
- Part serial: 0749
- Condition: Unserviceable
- Location: Avionics
- Part time: 328 hours
- Stage of operation: TX
- How discovered: V
- Nature of condition: S
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA991AA

## Discrepancy

CREW REPORTED AVIONICS MASTER SWITCH INOPERATIVE.  MAINTENANCE REMOVED AND REPLACED SWITCH.

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