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ASN Wikibase Occurrence # 187048
Last updated: 1 August 2019
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Type:Silhouette image of generic BE35 model; specific model in this crash may look slightly different
Beech G35 Bonanza
Registration: N4401D
C/n / msn: D-4599
Fatalities:Fatalities: 1 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Maricopa County, Sun Village, Surprise, AZ -   United States of America
Phase: Landing
Departure airport:Glendale, AZ (GEU)
Destination airport:Glendale, AZ (GEU)
Investigating agency: NTSB
The flight instructor was asked to complete a maintenance test flight of the airplane following the installation of a repaired carburetor. He elected to use the flight to provide instruction to the private pilot who had requested a checkout in the airplane. The private pilot reported that the flight was initially normal, but then the engine stopped responding to throttle control. According to the private pilot, the engine remained at idle power as the airplane descended and impacted trees in a residential area.

Examination of the wreckage revealed that the carburetor throttle cable was detached from the throttle body linkage. The bolt and castellated nut used to secure the throttle cable to the linkage were found lying separately in the engine cowling; there was no evidence that a cotter pin had been used to secure the nut on the bolt, as required.

It is likely that the loss of engine power resulted from the failure of the mechanic who installed the carburetor to install the cotter pin when he attached the throttle cable to the carburetor. During the maintenance test flight, the castellated nut backed off of the bolt, which resulted in a loss of throttle control.

Probable Cause: The mechanic's failure to properly secure the bolt connecting the throttle cable to the carburetor during the installation of the carburetor, which resulted in a loss of engine power.


FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 4 months
Download report: Final report


Photo: NTSB

Revision history:

08-May-2016 03:19 Geno Added
08-May-2016 23:15 Geno Updated [Aircraft type, Total fatalities, Source, Narrative]
08-May-2016 23:39 Geno Updated [Registration, Cn, Operator, Source]
14-May-2016 09:49 Iceman 29 Updated [Embed code]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
09-Sep-2018 17:27 ASN Update Bot Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ]
09-Sep-2018 18:01 harro Updated [Source, Narrative, Photo]

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