Many aircraft fires were caused by fuel fired heaters. They were phased out in the 70's and early 80's. I'm sure they are designed better now, but there is still a risk.
NTSB Identification: NYC04LA047.
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Nonscheduled 14 CFR
Accident occurred Thursday, December 11, 2003 in Buffalo, NY
Probable Cause Approval Date: 01/24/2005
Aircraft: Piper PA-23-250, registration: N40259
Injuries: 1 Uninjured.
After landing, as the pilot pulled into the ramp area, he noticed an orange glow at his feet, and notified airport personnel over the radio that he had a fire in the airplane. The pilot brought the airplane to a stop, and airport crash fire rescue extinguished the fire. Examination of the airplane revealed the fire burnt a hole through the fuselage skin in the area of the Janitrol heater, just aft of the left wing root. The entire area forward of the Janitrol heater, including the wiring and plumbing of the heater, as well as the cockpit and cabin was consumed by fire. The pilot reported that his normal procedure for using the Janitrol heater was to turn it off at the same time he extended the landing gear while on approach. The Pilot's Operating Handbook (POH), Description and Operations section stated, "The three positions of the cabin heat control switch are 'HEAT,' 'FAN,' and 'OFF'...It is advisable to place the switch in the fan position for several minutes after the heater has been operating to allow the unit to cool down before it is turned off." The Normal Procedures section of the POH required that the switch be turned to the "FAN" position while completing the Before and After Landing checklists. The Shutdown checklist called for the switch to be switched to the "OFF" position.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The pilot's improper procedure with regard to the cabin heater, which resulted in the over temperature of the heater and subsequent fire.