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NTSB Report
August 12, 1992 · Beech A36 · N416HC
Guntersville, AL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 12, 1992
Injury Outcomes
1 injury (1 minor injury)
Location
Guntersville, AL
Aircraft
Beech A36
Tail Number
N416HC
Operator
Trees Unlimited
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ATL92LA159
THE PILOT WAS PROCEEDING TO HIS DESTINATION AT FLIGHT LEVEL 210, BETWEEN CLOUD LAYERS. HE WAS APPROACHING A CLOUD CELL, AND REQUESTED TO DEVIATE TO THE NORTH. THE PILOT NOTICED NOTHING ON HIS WEATHER RADAR, AND HE DECIDED TO CONTINUE ON COURSE AFTER A VFR AIRCRAFT AHEAD OF HIM REPORTED NO SIGNIFICANT TURBULENCE. AS HE ENTERED THE CLOUD FORMATION, THERE WAS 'ONE VERY HARD HIT OF TURBULENCE', WITH ASSOCIATED ICE AND HAIL. HE THEN LOST CONTROL OF THE AIRCRAFT. AFTER A LOSS OF ABOUT 10,000 FEET OF ALTITUDE, HE WAS ABLE TO REGAIN AIRCRAFT CONTROL. DURING THE RECOVERY, HE NOTICED THE AIRSPEED IN EXCESS OF 'RED LINE.' HE LANDED THE AIRPLANE AT A NEARBY AIRPORT WITHOUT FURTHER INCIDENT. AN FAA INSPECTOR DETERMINED THAT THE AIRCRAFT WAS STRUCTURALLY DAMAGED IN FLIGHT. NTAP RADAR DATA SHOWS THAT THE FLIGHT PENETRATED AN AREA OF HEAVY WEATHER RETURNS.
NTSB Probable Cause
THE PILOT'S INADEQUATE EVALUATION OF THE IN FLIGHT WEATHER CONDITIONS, AND HIS SUBSEQUENT LOSS OF AIRCRAFT CONTROL, WHICH RESULTED IN THE DESIGN STRESS LIMITS OF THE AIRCRAFT BEING EXCEEDED. FACTORS WERE CLOUDS, THE ASSOCIATED TURBULENCE, AND THE HAIL IN THE CLOUDS.
Full Narrative
THE PILOT WAS PROCEEDING TO HIS DESTINATION AT FLIGHT LEVEL 210, BETWEEN CLOUD LAYERS. HE WAS APPROACHING A CLOUD CELL, AND REQUESTED TO DEVIATE TO THE NORTH. THE PILOT NOTICED NOTHING ON HIS WEATHER RADAR, AND HE DECIDED TO CONTINUE ON COURSE AFTER A VFR AIRCRAFT AHEAD OF HIM REPORTED NO SIGNIFICANT TURBULENCE. AS HE ENTERED THE CLOUD FORMATION, THERE WAS 'ONE VERY HARD HIT OF TURBULENCE', WITH ASSOCIATED ICE AND HAIL. HE THEN LOST CONTROL OF THE AIRCRAFT. AFTER A LOSS OF ABOUT 10,000 FEET OF ALTITUDE, HE WAS ABLE TO REGAIN AIRCRAFT CONTROL. DURING THE RECOVERY, HE NOTICED THE AIRSPEED IN EXCESS OF 'RED LINE.' HE LANDED THE AIRPLANE AT A NEARBY AIRPORT WITHOUT FURTHER INCIDENT. AN FAA INSPECTOR DETERMINED THAT THE AIRCRAFT WAS STRUCTURALLY DAMAGED IN FLIGHT. NTAP RADAR DATA SHOWS THAT THE FLIGHT PENETRATED AN AREA OF HEAVY WEATHER RETURNS.
Flight
Event TypeAccident
Event Time18:30 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech A36
Tail NumberN416HC
Aircraft CategoryAir
DamageSubstantial
OperatorTrees Unlimited
Operating RulePart 91
Engines1
Engine TypeTurboprop
Engine DetailsAllison · 250B17C · Turboprop · 420
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 27 · Second Class
Conditions
ConditionsIMC
LightDaylight
WindCalm
Visibility7 sm
CeilingOvercast 11000 ft
Altimeter30.00 inHg
Observation Time00:50
Weather SourceWFAC