ASN logo
ASN Wikibase Occurrence # 13866
Last updated: 10 January 2022
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

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: Written off (damaged beyond repair)
Location:Yosemite National Park, California -   United States of America
Phase: En route
Departure airport:Mariposa-Yosemite Airport, Mariposa, California (RMY/KMPI)
Destination airport:Long Beach, California (LGB/KLGB)
Investigating agency: NTSB
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.


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