NTSB Identification: DEN82FTC07
14 CFR Part 91: General Aviation
Accident occurred Wednesday, July 21, 1982 in LABARGE, WY
Probable Cause Approval Date: 07/21/1983
Aircraft: PIPER 18, registration: N83503
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE AIRCRAFT WAS ON A POWER LINE PATROL MISSION. THE REAR SEAT OCCUPANT WAS ACTING AS AN OBSERVER. HE WAS ALSO ALONG TO ASSIST THE COMPANY IN ROUTE FAMILIARIZATION OF THE PILOT, BUT WAS ASSIGNED NO OTHER OFFICIAL CREWMEMBER DUTIES. THE ACCIDENT OCCURRED WHILE THE AIRCREW WERE PATROLLING THE LINE TOWARD THE SOUTHWEST WITH A HEAD WIND. THE AIRCRAFT IMPACTED THE GROUND IN A STEEP NOSE DOWN ATTITUDE ON THE LEEWARD SIDE OF STEEPLY RISING TERRAIN. THE WRECKAGE WAS CONFINED WITHIN A RADIUS OF 30 FT WITH EXCEPTION OF A FUEL CAP AND RED NAVIGATION LIGHT THAT WERE SLIGHTLY FARTHER AWAY. NO PREIMPACT FAILURES WERE FOUND AND FLIGHT CONTROL CONTINUITY WAS ESTABLISHED. THE ELEVATION OF THE CRASH SITE WAS ABOUT 7000 FT MSL AND THE DENSITY ALTITUDE WAS ABOUT 10,000 FT.

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

AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND

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

STALL..INADVERTENT..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

TERRAIN CONDITION..RISING


Contributing Factors

WEATHER CONDITION..UNFAVORABLE WIND



Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY

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