On July 18, 1994, a Cessna 206 (registration N4685F) was involved in an aviation accident near Anchorage, AK. Investigators recorded the probable cause as: THE FAILURE OF THE THROTTLE CONTROL LEVER ARM AS A RESULT OF THE IMPROPER 100 HOUR INSPECTION BY COMPANY MAINTENANCE PERSONNEL. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.
Investigation found a throttle control lever arm wore completely through; bolt and washers used were not approved for the application. The aircraft had been inspected 35 hours prior.
Investigation Findings
Examination of the throttle control system revealed that the lever arm used to attach the ball bearing type throttle rod end to the carburetor had worn completely through. The side walls of the lever adjacent to the bolt hole exhibited scoring that matched the dimensions of the washers installed on the bolt and nut side of the lever. The bolt and washers used to connect the cable end to the lever were not approved for this application.
Inspection History
The aircraft involved had undergone an inspection 35 hours before the accident. No further details regarding the nature or scope of that inspection were provided in the source.
Components Examined
The throttle control lever arm, bolt, and washers were examined as part of the investigation. The wear pattern on the lever arm and the non-approved hardware were noted.
What happened in the 18 Jul 1994 Cessna 206 accident near Anchorage, AK?
Investigation found a throttle control lever arm wore completely through; bolt and washers used were not approved for the application. The aircraft had been inspected 35 hours prior.
What aircraft was involved and where did it happen?
The accident on 18 Jul 1994 involved a Cessna 206, registration N4685F, at Anchorage, AK.
What was the probable cause of the accident?
THE FAILURE OF THE THROTTLE CONTROL LEVER ARM AS A RESULT OF THE IMPROPER 100 HOUR INSPECTION BY COMPANY MAINTENANCE PERSONNEL.
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