# SDR 2003F00557

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2003
- Submitted: September 16, 2003
- Operation: General aviation
- Aircraft: [N52HL](https://openairdocs.org/aircraft/N52HL), registered now
- Make and model: Piper PA-31T1
- Registry model: [Piper PA-31T1](https://openairdocs.org/model/piper-pa-31t1) (OpenAirDocs)
- Aircraft serial: 31T8004023
- Engine: Pwa PT6*
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Combustion Liner
- Condition: Cracked
- Location: Heater
- Component: Heater, Janitrol
- Component part number: FR10E214EL
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2003F00557

## Discrepancy

DURING PRESSURE DECAY TESTS OF ELECTRO SYSTEMS JAN-AERO HEATERS, PN FR10E21-EL, WE HAVE DISCOVERED PRESSURE LEAKS IN THE CERAMIC COATED COMBUSTION TUBES.  THIS HAS OCCURED ON 4 SEPARATE OCCATIONS.  IT SHOULD BE NOTED THAT THE PERIODIC PRESSURE DECAY TEST REQUIRED BY AD 96-20-07 (DOES NOT APPLY TO) HEATER SERIES B3500 WITH (CERAMIC COATED) COMBUSTION TUBES.  ALTHOUGH THE PERIODIC PRESSURE DECAY TEST IS (NOT) REQUIRED BY AD 96-20-07 FOR CERTAIN HEATERS WITH (CERAMIC COATED) COMBUSTION TUBES.   MM CONTINUES TO RECOMMEND PERIODIC PRESSURE DECAY TEST OF THE HEATER COMBUSTION TUBES REGARDLESS OF THE HEATER CONFIGURATION.

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