ATL82FA092

NTSB accident investigation · Piper PA-31-350 · Baconton, GA · April 5, 1982

Accident · Serious injuriesField investigationFinal report
Date
April 5, 1982, 16:15 local (21:15 UTC)
Place
Baconton, GA
Injuries
3 serious, 2 minor
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N123CBPiper PA-31-350
Weather
Instrument (IMC) · Day
Status
Completed · report April 5, 1983
Report
Approved by Office Director
FAA report
19820405008199A
Case key
69865

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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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.

Airframe/component/system failure/malfunctionDescent - normal
Propeller system/accessories,counterweight - incorrectFactor
Maintenance,major repair - improperOther maintenance personnelFactor
Propeller system/accessories - vibrationFactor
Propeller system/accessories,hub - otherFactor
Maintenance - improperOther maintenance personnelFactor
Propeller system/accessories,hub - fatigueCause
Propeller system/accessories,blade - separationCause
Engine assembly - separationCause
Forced landingLanding - flare/touchdown
In flight collision with terrain/waterLanding - flare/touchdown
Wheels up landing - intentionalPilot in command
On ground/water collision with objectLanding - roll
Object - fenceFactor
On ground/water encounter with terrain/waterLanding - roll
Terrain condition - rough/unevenFactor

Analysis

As the pilot was descending from 7000 to 5000 ft, he heard a loud bang, followed by a temporary vibration and a violent swerve to the right. He looked out the right window and thought the right engine had fallen off since all he could see was the tops of the engine mounts. The aircraft was controllable only after reducing the left engine power to idle. During a wheels up/forced landing, the plane tore through a fence, slid across a paved road, went over an embankment and began burning after it came to rest. The pilot received a back injury and had difficulty egressing. An investigation revealed the propeller hub had failed from fatigue which resulted in blade separation and subsequent engine tearaway. The engine had remained attached to the airframe by cables. Metallurgical examination of the hub revealed that the fatigue originated at a threaded grease fitting. Gouging was visible on the inner wall. A set of incorrect counterweights were found on the propeller. The counterweight's function was to reduce vibration.

Aircraft

Registration
N123CB
Reported as
Piper PA-31-350
Category
Airplane
Serial number
31-7752161
Airframe hours
1,611
Engine
Lycoming 540-J2BD, 350 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Executive/Corporate · Part 91
Operator
Aircraft Service Center
Registered owner
Excelsior Leasing Corporation
Departed
Austin, TX
Destination
Tifton, GA
Flight plan
IFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
43
Certificates
Flight instructor, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Flight hours
5,344 total · 113 in this make and model · 5,177 as pilot in command · 146 in the last 90 days · 5 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Day
Wind
60° at 6 knots
Visibility
7 statute miles
Lowest ceiling
600 ft broken
Temperature
131 °F
Altimeter
29.00 inHg
Observed at
ABY, 13 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.