Accident NAMC YS-11A-202 N208PA, Tuesday 5 March 1974
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Date:Tuesday 5 March 1974
Time:11:10
Type:Silhouette image of generic YS11 model; specific model in this crash may look slightly different    
NAMC YS-11A-202
Owner/operator:Pacific Southwest Airlines - PSA
Registration: N208PA
MSN: 2082
Year of manufacture:1968
Fatalities:Fatalities: 0 / Occupants: 4
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:14 km E of Borrego Springs, CA -   United States of America
Phase: En route
Nature:Training
Departure airport:San Diego (unknown airport), CA
Destination airport:San Diego (unknown airport), CA
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
A high-stop (cruise pitch) hang-up of both propellers at low airspeed (while the aircraft was entering a stall maneuvered) caused excessive temperatures in the turbine sections of both engines. When the training crew tried to recover from the simulated landing stall, the engines didn't respond. The aircraft crash-landed in the desert. Excessive wear of the propeller hub contact switches was due to maintenance instruction deficiencies. Contributing was the crew non-adherence to prescribed procedures.

PROBABLE CAUSE:
personnel - maintenance,servicing,inspection: inadequate maintenance and inspection
powerplant - propeller system: other
dual student - improper operation of powerplant & powerplant controls
pilot in command - inadequate supervision of flight
FACTORS:
miscellaneous acts,conditions - failure of two or more engines
miscellaneous acts,conditions - excessive temperature
miscellaneous acts,conditions - fire in engine
miscellaneous acts,conditions - intentional wheels-up
partial power loss - partial loss of power - 1 engine
complete power loss - complete engine failure/flameout-1 engine

Accident investigation:
  
Investigating agency: NTSB
Report number: LAX74AL059
Status: Investigation completed
Duration:
Download report: Final report

Sources:

NTSB

Images:


photo (c) via Werner Fischdick; San Diego International Airport, CA (SAN); September 1973

Revision history:

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