# SDR 97ZZZX4050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 29, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N77NL](https://openairdocs.org/aircraft/N77NL), registered now
- Make and model: Piper PA-31T
- Registry model: [Piper PA-31T](https://openairdocs.org/model/piper-pa-31t) (OpenAirDocs)
- Aircraft serial: 31T7720038
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Heater
- Part number: FRIDE214EL
- Condition: Cracked
- Location: Head Flange
- 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/97ZZZX4050

## Discrepancy

THE COMBUSTION HEATER WAS PRESSURE DECAY CHECKED DURING PRE-PURCHASE EVALUATION. ALTHOUGH NOT REQUIRED BY AD 96-20-07, THE MANUFACTURER RECOMMENDS A PRESSURE DECAY CHECK AT 500 HOURS INITIAL AND 100-HOUR REPETITIVE INTERVALS.  THE HEATER FAILED THE PRESSURE CHECK AND THE UNIT WAS REMOVED FOR A BENCH CHECK.  FURTHER INVESTIATION REVEALED A CRACK WELD AT THE COMBUSTION HEAD RETAINING FLANGE.  THE UNIT WAS REPLACED.

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