ATL92FA039

NTSB accident investigation · Cessna 421C · Atlantic Ocean (Atlantic Ocean) · January 13, 1992

Accident · FatalField investigationFinal report
Date
January 13, 1992, 16:06 local (21:06 UTC)
Place
Atlantic Ocean (Atlantic Ocean)
Injuries
5 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N40JKCessna 421C
Weather
Instrument (IMC) · Day
Status
Completed · report October 8, 1993
Report
Approved by Office Director
FAA report
19920113000469A
Case key
8494

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 weather evaluation, and his continued flight into known adverse weather conditions. Factors were: the improper weather briefing by a flight service station specialist, and level iii thunderstorms.

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
Preflight briefing service - improperAtc personnel(fss)Factor
Weather evaluation - inadequatePilot in commandCause
Weather condition - thunderstorm,level iiiFactor
Hazardous weather advisory - issuedAtc personnel(dep/apch)
Flight into known adverse weather - continuedPilot in commandCause
Loss of control - in flightManeuvering - turn to reverse direction
Airframe/component/system failure/malfunctionDescent - uncontrolled
Design stress limits of aircraft - exceededPilot in command
Wing - overload
Wing - separation
In flight collision with terrain/waterDescent - uncontrolled

Analysis

At 0716, the pilot rcvd a wx brief for a proposed takeoff of 1130. The fss briefer provided info on tstms forecast in ga & FL. No info was provided about forecast lines & clusters of tstms in SC cstl plains & sern ga. En route, the pilot was given info about level iii tstms across the projected flight path by beaufort & savannah appch cntrl. ATC radar data revealed that the acft flew the route contained in the flight plan clearance. Radio transmissions from the acft indicated that onboard wx radar was being used. ATC radar data & radio communications indicated that the acft entered a tstm, then made a 180 degree turn to exit the storm. Examination of the wreckage revealed plastic deformation of the wings inboard of the engines in an upward direction. Also, both wings broke off outboard of the engines in a downward direction. The horizontal stab & elevator were not recovered. There was fuselage damage which indicated that the horizontal stab separated aft & down.

Aircraft

Registration
N40JK
Reported as
Cessna 421C
Category
Airplane
Serial number
42100441
Engine
Continental GTSIO-520-L, 375 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Operator
Williamson, J. M.
Registered owner
Williamson, J. M.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 26, 1991
Departed
MIV · Milville, NJ
Destination
X26 · Sebastian, FL
Flight plan
IFR

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
60
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Toxicology
Performed
Flight hours
3,064 total · 500 in this make and model

Weather

Conditions
Instrument (IMC) · Day
Wind
Calm
Visibility
1 statute miles
Lowest ceiling
1,200 ft overcast
Temperature
59 °F, dew point 59 °F
Altimeter
29.00 inHg
Observed at
SSI, 30 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.