# SDR 99ZZZX4494

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 12, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N229MC
- Make and model: Cessna 550
- Registry model: [Cessna 550](https://openairdocs.org/model/cessna-550) (OpenAirDocs)
- Aircraft serial: 5500229
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Scroll
- Part number: 12502081
- Condition: Damaged
- Location: Heater
- Part time: 2,190 hours
- Stage of operation: NR
- Nature of condition: B
- Precautionary procedure: F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4494

## Discrepancy

AFT EVAPORATOR SCROLL ASSY OVER HEATED AND BURNED A HOLE THROUGH IT IN-FLIGHT.  A FLAME WAS SEEN AND WAS PUT OUT WITH PORTABLE FIRE EXTINGUISHER.  UPON INSPECTION, A SALT PACK WAS DISCOVERED WEDGED AGAINST A RESISTOR ASSY INSIDE OF SCROLL ASSY AND CAUSED A HOT SPOT.

---
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.