DEN88LA137

NTSB accident investigation · Bell 206B3 · Missoula, MT · June 26, 1988

Accident · No injuriesLimited investigationFinal report
Date
June 26, 1988, 13:30 local (19:30 UTC)
Place
Missoula, MT
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N2754ABell 206B3
Weather
Visual (VMC) · Day
Status
Completed · report August 8, 1989
Report
Approved by Office Director
FAA report
19880626026179A
Case key
17487

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.

Loss of engine power(total) - mech failure/malfClimb
Reason for occurrence undeterminedCause
Forced landingDescent - emergency
Autorotation - performed
Hard landingLanding - flare/touchdown
Flare - improperPilot in command(cfi)Cause
Rotor rpm - not maintainedPilot in command(cfi)Cause
Terrain condition - softFactor
Misc rotorcraft,tail boom - sheared

Analysis

A check airman and a commercial plt were performing an instructional flt. During climbout after a practice autorotation, the engine out audio and light warning activated. Both pilots verified an actual engine out and entered an autorotation. The helicopter touched down on soft terrain with some forward movement and low rotor RPM. The main rotor blades contacted the tail boom and severed it. A post accident inspection supervised by an FAA airworthiness inspector, failed to reveal any evidence to explain the reported engine failure.

Aircraft

Registration
N2754A
Reported as
Bell 206B3
Category
Helicopter
Serial number
2647
Airframe hours
3,068
Engine
Allison 250-C20B, 420 horsepower, turbo shaft
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Minuteman Aviation Inc
Registered owner
Minuteman Aviation, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 6, 1988 · 17 hours before
Departed
MSO
Destination
MSO
Flight plan
Company VFR
Airport
MSO · Missoula Int'L

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
39
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Right
Flight hours
8,500 total · 3,000 in this make and model · 7,000 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 7 knots
Visibility
20 statute miles
Lowest ceiling
None
Temperature
81 °F

FAA reports on this event · 1

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