Serious incident Bellanca 8KCAB N7699S, Thursday 18 August 1988

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Date:	Thursday 18 August 1988
Time:	12:30 LT
Type:	Bellanca 8KCAB
Owner/operator:	Private
Registration:	N7699S
MSN:	263-76
Total airframe hrs:	1300 hours
Engine model:	Lycoming IO-320
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Minor
Category:	Serious incident
Location:	Miami, FL - United States of America
Phase:	En route
Nature:	Private
Departure airport:	Miami, FL (KTMB)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHILE ON A PERSONAL FLT DURING NORMAL CRUISE, THE PLT REPORTED THAT THE COCKPIT FILLED WITH SMOKE. HE TURNED OFF THE ELECTRICAL SYSTEM & SECURED THE ENG, THEN ATTEMPTED A PRECAUTIONARY LANDING ON A GRASS STRIP. THE ACFT LANDED LONG, OVERRAN THE RWY, & NOSED OVER. EXAMINATION OF THE ACFT REVEALED THE MUFFLER SHROUD HAD A CRACK WHICH ALLOWED THE AIR NORMALLY USED FOR CABIN HEAT TO CONTACT THE FIREWALL. AS A RESULT, THE INSULATION OF THE INSIDE OF THE CABIN OVERHEATED, PRODUCING SMOKE.

Probable Cause:

Accident investigation: