ASN Wikibase Occurrence # 367068
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| Date: | Saturday 28 April 1990 |
| Time: | 14:41 LT |
| Type: |  Beechcraft M35 Bonanza |
| Owner/operator: | Private |
| Registration: | N1ZY |
| MSN: | D-6362 |
| Total airframe hrs: | 2630 hours |
| Engine model: | CONTINENTAL IO-470-C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Tomball, TX -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | (KDWH) |
| (KDWH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRPLANE WAS DAMAGED WHEN IT COLLIDED WITH A FENCE AND A DITCH DURING A FORCED LANDING FOLLOWING A COMPLETE ENGINE FAILURE. INVESTIGATION REVEALED THAT THE NO. 5 PISTON WAS SEVERELY HEAT ERODED WITH PIECES MISSING. THE EROSION ALLOWED EXHAUST VENTING (BLOW BY) INTO THE CASE. THERE WAS SOME EVIDENCE OF PRE-IGNITION ON THE OTHER PISTONS' BUT NOT TO THE EXTENT AS ON NO. 5. IT WAS DETERMINED THAT THE ENGINE WAS 17 HOURS OUT OF A MAJOR OVERHAUL AND HAD BEEN USING AUTO GAS AT THE TIME OF THE ACCIDENT. IT APPEARED THAT THE PISTON EROSION HAD OCCURRED OVER A LONG PERIOD OF TIME.
Probable Cause: AN ENGINE FAILURE DUE TO DETONATION AND SUBSEQUENT PISTON OVERTEMPERATURE AND EROSION. A FACTOR RELATED TO THE ACCIDENT WAS THE LACK OF SUITABLE TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB FTW90LA103
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Mar-2024 07:09 | ASN Update Bot | Added |
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