# SDR MFG2013F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 30, 2013
- Submitted: December 20, 2013
- Operation: Air carrier
- Aircraft: N147NA
- Make and model: Beech B200
- Registry model: [Beech B200](https://openairdocs.org/model/beech-b200) (OpenAirDocs)
- Aircraft serial: BB1047
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Amplifier
- Part number: 246
- Part serial: 1003
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MFG2013F00000

## Discrepancy

WITH NO PASSENGERS THE PILOTS EXPERIENCED A LOUD SQUEALING IN THEIR HEADSETS SO THEY TURNED OFF ALL ENVIRONMENTALS & THE NOISE WENT AWAY.  THEY TURNED AROUND & WERE COMING BACK TO DEPARTURE, WHEN THEY SMELLED WHAT THEY THOUGHT WAS SMOKE.  THEY DECLARED AN EMERGENCY & LANDED UNEVENTFULLY.  THE AUDIO AMPLIFIER WAS THE CAUSE OF THE NOISE & THE BLEED AIR DUCKS WERE THE CAUSE OF THE SMELL,  WHEN THEY GOT SO HOT FROM THE BLEED AIR BEING ON WITH NO BLOWERS RUNNING.

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