# SDR 97ZZZX780

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 1, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N200BE](https://openairdocs.org/aircraft/N200BE), registered now
- Make and model: Beech 200BEECH
- Aircraft serial: BB832
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Breaker
- Part number: 727725
- Condition: Failed
- Location: Oxy Baro Sys
- Part time: 6,500 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX780

## Discrepancy

WHILE DEMONSTRATING THE FUNCTION OF THE CABIN BAROMETRIC SWITCH TO A TRAINEE, IT WAS FOUND THAT WHEN POWER WAS APPLIED TO THE SOLENOID ON THE BAROMETRIC SYSTEM, THE OXYGEN VALVE DID NOT OPEN AND DROP THE MASKS.  TROUBLESHOOTING FOUND A VOLTAGE DROP AT THE CIRCUIT BREAKER.  WHEN THE C/B WAS REPLACED, THE SYSTEM WORKED AS ADVERTISED.  THERE IS NO FUNCTIONAL TEST OF THE ELECTRICAL PORTION OF THE OXYGEN AUTO DEPLOY SYSTEM, BUT IT MIGHT BE A GOOD IDEA TO PERFORM IT WHEN THE BARO VALVE IS OVERHAULED IN 24 MOS.

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