MKC89LA195

NTSB accident investigation · Bell 47G · Ozark, MO · September 2, 1989

Accident · No injuriesLimited investigationFinal report
Date
September 2, 1989, 12:15 local (17:15 UTC)
Place
Ozark, MO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N182JRBell 47G
Weather
Visual (VMC) · Day
Status
Completed · report July 11, 1990
Report
Approved by Office Director
FAA report
19890902033339A
Case key
34861

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 failure of the dual student to properly flare during an autorotative landing resulting in a hard landing and partial failure of the right skid. The CFI also failed to properly monitor the student's actions on the flight controls.

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.

Hard landingLanding - flare/touchdown
Autorotation - misjudgedDual studentCause
Landing gear,skid assembly - failure,partialFactor
Supervision - inadequatePilot in command(cfi)Cause
Nose overLanding - flare/touchdown
Roll overLanding - flare/touchdown

Analysis

While practicing autorotation landings, the tail boom began to rise after touchdown which resulted in the helicopter rolling to the right and the main rotor blades striking the terrain. The helicopter came to rest on it's right side. Accident investigation revealed that the right skid, forward of the front upright had fractured. The broken portion of the skid had cut a groove in the grass a distance of about 2 feet before imbedding itself, causing the helicopter to stop. The forward inertia bought the tail boom up which resulted in the rotor strike and roll over.

Aircraft

Registration
N182JR
Reported as
Bell 47G
Category
Helicopter
Serial number
22
Airframe hours
10,707
Engine
Franklin 6V-335-53, 210 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Dick Hill Int. Flight School
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · July 13, 1989 · 76 hours before
Departed
2K2 · Ozark, MO
Airport
2K2 · Air Park South, runway 17, 800 × 100 ft, grass/turf

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
47
Certificates
Flight instructor, Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Flight hours
379 total · 160 in this make and model · 265 as pilot in command · 74 in the last 90 days · 33 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
60° at 5 knots
Visibility
7 statute miles
Lowest ceiling
1,200 ft overcast
Temperature
75 °F, dew point 70 °F
Observed at
SGF, 10 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.

Other investigations on N182JR · 3

Matched to the same aircraft by N-number and date.