ATL92LA159

NTSB accident investigation · Beech A36 · Guntersville, AL · August 12, 1992

Accident · Minor injuriesLimited investigationFinal report
Date
August 12, 1992, 18:30 local (23:30 UTC)
Place
Guntersville, AL
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N416HCBeech A36
Weather
Instrument (IMC) · Day
Status
Completed · report May 26, 1993
Report
Approved by Office Director
FAA report
19920812031119A
Case key
8646

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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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.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight encounter with weatherCruise - normal
Weather condition - cloudsFactor
Weather condition - turbulence in cloudsFactor
Weather condition - hailFactor
Weather evaluation - inadequatePilot in commandCause
Loss of control - in flightCruise - normal
Aircraft control - not maintainedPilot in commandCause
Design stress limits of aircraft - exceededCause

Analysis

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.

Aircraft

Registration
N416HC
Reported as
Beech A36
Category
Airplane
Serial number
E-2408
Engine
Allison 250B17C, 420 horsepower, turbo prop
Damage
Substantial damage
Flight
Ferry · Part 91
Operator
Trees Unlimited, Inc.
Registered owner
Trees Unlimited, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Unknown · January 2, 2000
Departed
LIT · Little Rock, AR
Destination
PDK · Atlanta, GA
Flight plan
IFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
27
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
1,600 total · 102 in this make and model · 1,600 as pilot in command · 205 in the last 90 days · 105 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Day
Wind
Calm
Visibility
7 statute miles
Lowest ceiling
11,000 ft overcast
Temperature
79 °F, dew point 73 °F
Altimeter
30.00 inHg
Observed at
HSV, 29 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.