NTSB Identification: LAX86LA036.
The docket is stored on NTSB microfiche number 30107.
Accident occurred Friday, November 08, 1985 in MAMMOTH LAKES, CA
Aircraft: PIPER PA-28R-200, registration: N3096R
Injuries: 2 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT REPORTED THAT WHEN HE OBSERVED THE ARPT'S WIND SOCK IN PREPARATION FOR DEPARTURE THE WIND WAS BLOWING DOWN THE RWY WITH OCCASIONAL GUSTS THAT DID NOT SEEM OVER 20 KTS. AFTER TAKING OFF & CLIMBING TO ABT 100 FT AGL, THE ACFT ENCOUNTERED TURBULENCE LIKELY ASSOCIATED WITH A MOUNTAIN WAVE CONDITION. THE PLT STATED & A GROUND- BASED WITNESS REPORTED THAT THE ACFT RAPIDLY ROLLED 90 DEG. RT & DESCENDED. JUST BEFORE COLLIDING WITH TERRAIN THE ACFT'S WINGS WERE LEVELED. NO MECHANICAL FAILURES OR MALFUNCTIONS WERE REPORTED BY THE PLT. 30 MIN AFTER THE CRASH THE ARPT'S SPECIAL WX OBSERVATION LISTED THE PRESENCE OF STANDING LENTICULAR ALTOCUMULUS CLDS IN ALL QUADRANTS, & THE SURFACE WINDS WERE 15 KTS GUSTING TO 25 KTS.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

WIND INFORMATION..NOT ATTAINED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

WEATHER EVALUATION..INADEQUATE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

JUDGMENT..POOR..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..MOUNTAIN WAVE


Contributing Factors

WEATHER CONDITION..TURBULENCE IN CLOUDS

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