# SDR 2005FA0000343

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 3, 2005
- Submitted: March 18, 2005
- Operation: General aviation
- Aircraft: [N220FS](https://openairdocs.org/aircraft/N220FS), registered now
- Make and model: Piper PA-31T
- Registry model: [Piper PA-31T](https://openairdocs.org/model/piper-pa-31t) (OpenAirDocs)
- Aircraft serial: 31T7620052
- Engine: Pwa PT6A60A
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Solenoid Valve
- Part number: CD21701
- Part serial: 828
- Condition: Failed
- Location: Heater
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005FA0000343

## Discrepancy

INSTALLED A NEW C&D AIRCRAFT HEATER AS A REPLACEMENT TO THE OLD HEATER UNIT.  THE NEW HEATER WOULD RUN APPROX 5 MINUTES AND THEN PRODUCE NO HEAT.  TROUBLESHOOTING SHOWED THAT FUEL WAS REACHING TO THE NOZZLE SOLENOID VALVE, BUT NOT PAST.   VOLTAGE WAS PRESENT, AS WELL AS A CLICK FROM THE SOLENOID.  REPLACED THE SOLENOID VALVE WITH THE SAME PN, AND HAD THE SAME ISSUE.  FURTHER TROUBLESHOOTING, USING SHOP AIR ON THE VALVE AND A BENCH POWER SUPPLY, SHOWED THAT AFTER VALVE WOULD HEAT UP FROM THE ELECTRICAL CURRENT RUNNING THRU IT (APPROX 5 MINUTES) THE UNIT WOULD NOT ALLOW AIR TO PASS.  THE MFG WAS ADVISED OF THESE FINDINGS, AND TESTED  A REPLACEMENT VALVE OF THE SAME PN, BUT OF A DIFFERENT BATCH NR AND FOUND IT TO

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.