MKC85FA189

NTSB accident investigation · Bell 47G-2A · Sedalia, MO · August 17, 1985

Accident · Serious injuriesField investigationFinal report
Date
August 17, 1985, 16:40 local (21:40 UTC)
Place
Sedalia, MO
Injuries
1 serious, 2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N3951UBell 47G-2A
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19850817039249A
Case key
33852

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

On this page

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/malfunctionTakeoff
Rotor drive system,tail rotor drive shaft bearing - failure,totalCause
Rotor drive system,tail rotor drive shaft - overload
Forced landingTakeoff
In flight collision with objectLanding
Object - vehicleFactor

Analysis

The plt was taking 2 passengers on a helicopter ride at a fair. Immediately after lift-off, he encountered a situation where he was unable to maintain directional control, so he reduced power & landed. Before coming to rest, the tail of the helicopter struck a van. An investigation revealed that the inner bearing (pn 47-620-605-001) of the tail rotor drive had failed, then the drive shaft failed. AD 81-04-03, amendment 39-4029 became effective on 2/2/81 to replace the bearing in the next 600 hrs of service. However, the helicopter had accumulated less than 600 hrs since that date.

Aircraft

Registration
N3951U
Reported as
Bell 47G-2A
Category
Helicopter
Serial number
1376
Airframe hours
12,302
Engine
Lycoming V0-435-A1B, 200 horsepower, reciprocating
Damage
Substantial damage
Flight
Other work use · Part 91
Registered owner
Metropolitan Helicopter, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 22, 1985 · 209 hours before

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
30
Certificates
Airline transport, Flight instructor
Airplane ratings
Single-engine sea, Single-engine land, Multi-engine land
Instrument ratings
Airplane, Helicopter
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
6,684 total · 1,200 in this make and model · 6,494 as pilot in command · 151 in the last 90 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
88 °F
Altimeter
29.00 inHg
Observed at
COU

FAA reports on this event · 1

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