# SDR 95ZZZX6581

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N5771C
- Make and model: Snias AS350B
- Aircraft serial: 1369
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Tachometer Box
- Part number: 017755517
- Condition: Failed
- Location: Aft Cargo
- 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/95ZZZX6581

## Discrepancy

BLEED VALVE WOULD NOT STAY CLOSED ON ENGINE.  BLEED VALVE IS CONTROLLED BY AN ELECTRO-PNEUMATIC SIGNAL.  TACHOMETER BOX CONTROLS THE ELECTRICAL SIGNAL AND, IN THIS CASE, TACHOMETER BOX FAILED INTERNALLY.  ACFT TT, 7,372.2 HOURS.

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