# SDR 2002FA0000405

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2002
- Submitted: March 28, 2002
- Operation: General aviation
- Aircraft: [N71HE](https://openairdocs.org/aircraft/N71HE), registered now
- Make and model: Cessna 425
- Registry model: [Cessna 425](https://openairdocs.org/model/cessna-425) (OpenAirDocs)
- Aircraft serial: 4250085
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Tube
- Part number: CM36914
- Condition: Melted
- Location: Pneumatic Tube
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000405

## Discrepancy

RIGHT INSTRUMENT AIR PRESSURE WAS AT ZERO ON THE GROUND AND WOULD INCREASE AS CABIN PRESSURE INCREASED IN FLIGHT.  FOUND PNEUMATIC SUPPLY LINE FROM COMMON TEE TO FORWARD PRESSURE BULKHEAD MELTED.  REPLACED TUBING.

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