ASN Wikibase Occurrence # 230837
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| Date: | Saturday 23 November 2019 |
| Time: | 12:44 LT |
| Type: |  Beechcraft E35 Bonanza |
| Owner/operator: | Spaceport Aviation |
| Registration: | N3315C |
| MSN: | D-3981 |
| Year of manufacture: | 1954 |
| Total airframe hrs: | 5059 hours |
| Engine model: | Continental E-225-8 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Okeechobee County Airport (KOBE), FL -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | Okeechobee County Airport, FL (OBE/KOBE) |
| Marathon-Florida Keys Airport, FL (MTH/KMTH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While climbing on course shortly after takeoff on a cross-country flight, the engine briefly ran roughly before losing partial power. The private pilot maneuvered the airplane and executed an off airport forced landing with the landing gear retracted. A postimpact fire on the right side of the airplane ensued after it came to rest, and the airplane was destroyed.
Examination of the engine following accident revealed the throttle control cable was separated from the intact carburetor throttle control lever. Examination of a bolt with an attached washer, a separate washer, and a castellated nut found in the engine compartment revealed the nut was not self-locking and the tare torque was no greater than 0.2 pound-force-inch. There were no remains of a cotter pin in the recovered drilled bolt. Although the mixture control cable remained attached to the intact mixture control lever, a castellated nut and cotter pin were not attached to the bolt. Further examination of the engine and its systems otherwise revealed no evidence of preimpact mechanical failure or malfunction; Given this evidence, it is likely that the loss of engine power was due to the separation of the throttle control cable from the carburetor, which rendered sustained flight impossible.
A review of the maintenance records indicated that more than 13 months before the accident, the pressure carburetor was overhauled then reinstalled. It was the subject of two scheduled inspections before the accident. The maintenance records did not document any subsequent work to the throttle or mixture control cables. The mechanic indicated that he was certain that the proper hardware to secure the throttle cable to the throttle control lever was installed at carburetor installation and during both subsequent scheduled inspections. Although the nut lacked any appreciable tare torque, it could not be determined when it separated or if the mechanic failed to install a cotter pin to secure the throttle cable to the throttle control lever more than 13 months and a minimum of 192 flight hours earlier. Although possible, it is unlikely that the mechanic would have twice overlooked the lack of proper securing hardware during the subsequent scheduled inspections.
Probable Cause: The separation of the throttle control cable from the carburetor throttle control lever resulting in the near total loss of engine power. Contributing to the separation of the throttle cable was the lack of proper securing hardware by unknown maintenance personnel.
Accident investigation:
 |
|
Sources:
NTSB ERA20LA044
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=3315C
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Nov-2019 22:08 | Captain Adam | Added |
| 23-Nov-2019 22:30 | gerard57 | Updated [Aircraft type] |
| 24-Nov-2019 05:45 | RobertMB | Updated [Time, Aircraft type, Nature, Source, Narrative] |
| 25-Nov-2019 15:28 | RobertMB | Updated [Aircraft type, Registration, Cn, Operator, Phase, Source, Narrative] |
| 26-Nov-2019 07:27 | Anon. | Updated [Phase] |
| 01-Jul-2022 14:52 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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