ASN Wikibase Occurrence # 357478
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| Date: | Sunday 28 April 1996 |
| Time: | 13:45 LT |
| Type: |  Cessna 320 |
| Owner/operator: | Private |
| Registration: | N5752X |
| MSN: | 320-0052 |
| Year of manufacture: | 1961 |
| Total airframe hrs: | 3059 hours |
| Engine model: | Continental TSIO-470-B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mammoth Lakes, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | (KMMH) |
| San Martin, CA (Q99) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot performed a static engine run-up, and with no discrepancies noted, he commenced the takeoff. Upon reaching between 25 and 50 feet above the runway during the initial climb, the normal 35 inches of manifold pressure (MP) was observed being produced by the left engine. However, the right engine only produced between 18 and 20 inches of MP. The airplane veered right and settled into the rough/uneven terrain near the airport. The airport's elevation is 7,128 feet mean sea level, and the calculated density altitude was over 8,200 feet. An examination of the right engine's turbocharger assembly revealed the absolute pressure controller was set lower than the manufacturer's specifications required. Also, the wastegate butterfly valve was mechanically binding in its housing and would not fully close.
Probable Cause: the partial failure of the right engine turbocharger wastegate butterfly valve to fully close due to mechanical binding and the low setting of its associated absolute pressure controller. A related factor was the high density altitude which reduced the engine's ability to produce adequate manifold pressure.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA180
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 18:21 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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