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NTSB Report
July 8, 1992 · Beech 58 · N23LB
Pierce, ID
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 8, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Pierce, ID
Aircraft
Beech 58
Tail Number
N23LB
Operator
Sinclair Richard C
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA92FA154
PRIOR TO TAKEOFF, THE PILOT OBTAINED A WEATHER BRIEFING AND WAS INFORMED OF MOUNTAIN OBSCUREMENT, RAIN SHOWERS, AND THUNDERSTORM ACTIVITY IN THE AREA OF THE FLIGHT PATH. THE PILOT HAD FILED THE ROUTE OF FLIGHT DIRECT FROM BOISE, ID, TO MCCALL, ID, TO THOMPSON FALLS, MT, TO KALISPELL, MT. THE ACCIDENT SITE WAS LOCATED APPROXIMATELY 45 MILES EAST OF THE DIRECT LINE OF FLIGHT PATH IN MOUNTAINOUS TERRAIN. RADAR DATA IDENTIFIES THE FLIGHT AS MANEUVERING ON VARIOUS HEADINGS BEFORE THE FLIGHT DROPPED FROM RADAR CONTACT. THE WRECKAGE WAS FOUND CONFINED TO A DEEP CRATER WITH THE NOSE OF THE AIRPLANE AT THE CRATER'S DEEPEST POINT. IT WAS ESTIMATED THAT THE AIRPLANE COLLIDED WITH THE TERRAIN IN AN APPROXIMATE 70 DEGREE NOSE DOWN ATTITUDE. THERE WAS NO EVIDENCE FOUND TO INDICATE A MECHANICAL FAILURE OR MALFUNCTION.
NTSB Probable Cause
INFLIGHT LOSS OF CONTROL WHEN AIRCRAFT CONTROL WAS NOT MAINTAINED. FACTORS TO THE ACCIDENT WERE: FLIGHT INTO KNOWN ADVERSE WEATHER AND THUNDERSTORM ACTIVITY.
Full Narrative
PRIOR TO TAKEOFF, THE PILOT OBTAINED A WEATHER BRIEFING AND WAS INFORMED OF MOUNTAIN OBSCUREMENT, RAIN SHOWERS, AND THUNDERSTORM ACTIVITY IN THE AREA OF THE FLIGHT PATH. THE PILOT HAD FILED THE ROUTE OF FLIGHT DIRECT FROM BOISE, ID, TO MCCALL, ID, TO THOMPSON FALLS, MT, TO KALISPELL, MT. THE ACCIDENT SITE WAS LOCATED APPROXIMATELY 45 MILES EAST OF THE DIRECT LINE OF FLIGHT PATH IN MOUNTAINOUS TERRAIN. RADAR DATA IDENTIFIES THE FLIGHT AS MANEUVERING ON VARIOUS HEADINGS BEFORE THE FLIGHT DROPPED FROM RADAR CONTACT. THE WRECKAGE WAS FOUND CONFINED TO A DEEP CRATER WITH THE NOSE OF THE AIRPLANE AT THE CRATER'S DEEPEST POINT. IT WAS ESTIMATED THAT THE AIRPLANE COLLIDED WITH THE TERRAIN IN AN APPROXIMATE 70 DEGREE NOSE DOWN ATTITUDE. THERE WAS NO EVIDENCE FOUND TO INDICATE A MECHANICAL FAILURE OR MALFUNCTION.
Flight
Event TypeAccident
Event Time10:33 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech 58
Tail NumberN23LB
Aircraft CategoryAir
DamageDestroyed
OperatorSinclair Richard C
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · IO-520-C · Reciprocating · 285
Seats6
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 62 · Third Class
Conditions
ConditionsUnknown
LightDaylight
Wind270° @ 10 kt
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourceWIT