Accident Piper PA-34-200 Seneca N56954, Tuesday 4 July 1978
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Date:Tuesday 4 July 1978
Type:Silhouette image of generic PA34 model; specific model in this crash may look slightly different    
Piper PA-34-200 Seneca
Owner/operator:Pacific Wing Airways
Registration: N56954
MSN: 34-7450042
Fatalities:Fatalities: 5 / Occupants: 5
Other fatalities:0
Aircraft damage: Destroyed
Location:Yosemite National Park, California -   United States of America
Phase: Take off
Departure airport:Mariposa-Yosemite Airport, Mariposa, California (RMY/KMPI)
Destination airport:Long Beach, California (LGB/KLGB)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Written off July 4 1978 when crashed into the Yosemite National Park, California whilst en route between Mariposa, California, and Long Beach; all five persons on board (pilot and four passengers) killed.

Aircraft initially posted as "missing" until the wreckage were recovered (the park covers over 761,000 acres): recovery date July 10, 1978. The official NTSB report into the accident attributed the cause of the accident to the pilot "physical impairment - alcoholic impairment and judgement" causing him to "misjudge altitude and clearance" of the rising terrain that the aircraft was flying over. A post-mortem revealed that the pilot's Blood alcohol level was tested at .08%.

Registration N56954 cancelled by the FAA on December 23, 1981, three and a half years later.

Accident investigation:
Investigating agency: NTSB
Report number: OAK78FA037
Status: Investigation completed
Duration: 3 months
Download report: Final report


1. NTSB Identification: OAK78FA037 at
2. FAA:

Revision history:

25-Feb-2008 12:00 ASN archive Added
01-Dec-2016 17:31 Dr. John Smith Updated [Aircraft type, Operator, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative]

Corrections or additions? ... Edit this accident description

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