ASN Wikibase Occurrence # 354630
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| Date: | Saturday 4 April 1998 |
| Time: | 13:20 LT |
| Type: |  Aero Commander S2R |
| Owner/operator: | Private |
| Registration: | N8984Q |
| MSN: | 1654-R |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 6263 hours |
| Engine model: | Wright R-1820-76B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Cushing, OK -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Agricultural |
| Departure airport: | (KCUH) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the initial takeoff/climb a loss of manifold pressure was noted by the pilot. The engine backfired as the pilot increased the throttle and mixture and lost power. During the forced landing, the pilot maneuvered the airplane to avoid power lines and homes. The main gear collapsed as the airplane touched down hard in an open field. Examination revealed that the mixture control arm at the carburetor was loose; however, the nut and cotter key were intact. The mixture control in the cockpit was full forward; however, the mixture control at the carburetor was set at less than 50 percent travel toward the rich stop on the carburetor. Engine continuity was confirmed to the accessory case; however, neither magneto rotated when the propeller rotated. A mechanic stated that this lack of magneto rotation indicates that the accessory shaft has sheared inside the rear case of the engine. The carburetor and engine were not disassembled, therefore, it was not determined whether the damage to the mixture control and the drive shaft were preexisting or impact related.
Probable Cause: The total loss of engine power resulting from a sheared accessory drive due to an undetermined reason. A factor was the lack of suitable terrain for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB FTW98LA171
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 16:34 | ASN Update Bot | Added |
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