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| Date: | Thursday 2 January 1975 |
| Time: | 08:35 |
| Type: |  Beechcraft A60 Duke |
| Owner/operator: | Penhall Company |
| Registration: | N2855W |
| MSN: | P-229 |
| Fatalities: | Fatalities: 5 / Occupants: 5 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Mammoth Lakes-Yosemite Airport, California -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Executive |
| Departure airport: | Mammoth Lakes-Yosemite Airport |
| Santa Ana, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The aircraft experienced a dual propeller overspeeding while on initial climb from Mammoth Lakes-Yosemite Airport, subsequently causing a stall and impact with terrain in Mammoth Lakes, California. The aircraft was engulfed in flames and all 5 occupants were killed.
Probable Cause :
Inadequate preflight preparation on part of the pilot. The following contributing factors were reported:
- Propeller and accessories: hydraulic pitch control mechanism,
- Lack of action on part of the pilot,
- Failed to maintain flying speed,
- Propeller oversped due to congealed oil,
- The pilot failed to exercise props checks before takeoff.
Accident investigation:
|
Sources:
NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Feb-2008 12:00 | ASN archive | Added |
| 12-Apr-2019 17:22 | Captain Adam | Updated [Operator, Location, Phase, Nature, Departure airport, Narrative, ] |
| 21-May-2024 21:34 | Nepa | Updated [Location, Narrative, Operator, ] |
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