ASN Wikibase Occurrence # 178573
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| Date: | Wednesday 12 August 2015 |
| Time: | 09:30 |
| Type: |  Beechcraft N35 Bonanza |
| Owner/operator: | Private |
| Registration: | N390Z |
| MSN: | D-6762 |
| Year of manufacture: | 1961 |
| Total airframe hrs: | 6663 hours |
| Engine model: | Continental IO-470-N |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Near Love Field Airport (97FL), Weirsdale, FL -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Weirsdale, FL (97FL) |
| Fort Myers, FL (FMY) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot was departing in his airplane on a personal flight. A witness, who was a pilot and had seen the airplane take off many times before, reported that, on this takeoff, the airplane appeared lower and slower than he expected. He further noted that the engine initially sounded normal but then started to "stall" as if a cylinder was "missing." The airplane impacted tress about 1,000 ft past the end of the runway and was partially consumed by a postcrash fire. Damage to the propeller blades was indicative of some engine power being produced at the time of impact. Examination of the engine's throttle body metering unit revealed that the mixture control arm remained attached to the unit; however, when turned, it rotated on the shaft with no shaft movement. Disassembly of the unit revealed the internal splines of the throttle and mixture arms were stripped, and brass material from the bronze arms was transferred to the external splines of the steel shafts. The bronze arms should have been replaced with stainless steel arms per a service bulletin issued by the engine manufacturer 8 years before the accident. Because of impact and fire damage to the metering unit; it could not be determined if the stripped arms were the result of impact or an undertorque condition.
Probable Cause: A partial loss of engine power during takeoff. The reason for the partial loss of power could not be determined due to the extensive fire and impact damage to the engine.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=390Z
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Aug-2015 07:13 | Geno | Added |
| 13-Aug-2015 07:18 | Geno | Updated [Phase, Departure airport, Destination airport, Source] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 08-Sep-2017 19:47 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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