ASN Wikibase Occurrence # 44084
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| Date: | Friday 14 July 2006 |
| Time: | 17:45 |
| Type: |  Cessna 172N |
| Owner/operator: | Mac Dan Aviation |
| Registration: | N4792D |
| MSN: | 17272361 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 10675 hours |
| Engine model: | Lycoming O-320 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Pompton Lakes, NJ -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Caldwell, NJ (CDW) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The accident flight was the first flight after the airplane's most recent annual inspection was completed. During the flight, the pilot reported that he had no throttle control. The pilot further stated that the engine rpm was 1,400, and the airplane was losing altitude. The pilot attempted to execute a forced landing to an access road; however, the airplane struck trees and a postcrash fire ensued. Examination of the wreckage revealed that the throttle body portion of the carburetor remained attached to the engine, and the cotter pin was missing from the throttle lever locknut. The throttle lever locknut was partially backed-off its stop. In addition, the throttle lever was loose, and the serrations on the throttle shaft stop were disengaged from the serrations on the throttle lever. Review of maintenance records revealed that during the annual inspection, the throttle shaft bushings and shaft assembly were noted as worn, and were subsequently removed and replaced. The mechanic that performed the work stated that he recalled installing a throttle shaft bushing and a throttle shaft, but did not recall a cotter pin missing. Review of a Cessna service manual revealed instructions and diagrams to secure the locknut with a cotter pin. No other preimpact mechanical malfunctions were observed.
Probable Cause: Improper maintenance of the throttle shaft, which resulted in a partial loss of engine power during cruise flight, and subsequent impact with trees during a forced landing.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20060720X00970&key=1
History of this aircraft
Other occurrences involving this aircraft
| 7 February 1987 | N4792D | Macdan Aviation | 0 | Caldwell, NJ | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 05-Dec-2017 09:16 | ASN Update Bot | Updated [Other fatalities, Destination airport, Source, Narrative] |
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