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Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

February 24, 1995 · Bell 206 · N2277T

Dillon, MT

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
February 24, 1995
Injury Outcomes
No injuries (2 uninjured)
Location
Dillon, MT
Aircraft
Bell 206
Tail Number
N2277T
Operator
Carisch Mike G
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA95GA062

THE PILOT LANDED AT A REMOTE SNOW-SURVEY SITE, AND THEN MOVED THE CYCLIC IN A CIRCLE TO TEST WHETHER THE SNOW WOULD SUPPORT THE WEIGHT OF THE HELICOPTER. SENSING THAT THE SNOW WAS FIRM ENOUGH TO SUPPORT THE HELICOPTER'S WEIGHT, THE PILOT ELECTED TO SHUT DOWN THE ENGINE. AFTER HE HAD SHUT OFF THE ENGINE AND THE ROTOR WAS DECELERATING, ONE OF THE SNOWPAD-EQUIPPED SKIDS BROKE THROUGH THE SNOW. AS THE SKID BROKE THROUGH THE SNOW, THE TAIL ROTOR IMPACTED THE SNOW AND THEN CONTACTED THE TAIL BOOM CAUSING SUBSTANTIAL DAMAGE.

NTSB Probable Cause

THE PILOT'S SELECTION OF A LANDING SITE THAT WAS NOT SUITABLE TO SUPPORT THE WEIGHT OF THE HELICOPTER. FACTORS INCLUDE TERRAIN COVERED WITH SOFT SNOW.

Full Narrative

On February 24, 1995, approximately 1030 mountain standard time (MST), the tail rotor of a Bell 206, N2277T, impacted the snow as the pilot was shutting down the aircraft about 42 miles southwest of Dillon, Montana. The commercial pilot and his passenger were not injured, but the helicopter sustained substantial damage. The Public Use snow-survey flight, which departed another remote site about 1000 that morning, had landed on the snow pack in order for the Soil Conservation Service to measure the snow depth. The aircraft was being operated in visual meteorological conditions at the time of the accident. No flight plan had been filed, and there was no report of an ELT activation. According to the pilot, he set the helicopter down on the snow and rotated the cyclic in a circle in order to check the firmness of the snowpack before shutting down. Because the snow appeared to be firm enough to hold the weight of the helicopter, he decided it would be all right to shut down the engine. As he shut off the engine and the main rotor began to decelerate, one of the skids broke through the snow, and the tail rotor impacted the snow, and then struck the tail boom. The helicopter's skids were equipped with snowpads. The pilot did not return pages three and five of NTSB Form 6120.1/2.

Flight

Event TypeAccident
Event Time10:30 MST
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftBell 206
Tail NumberN2277T
Aircraft CategoryHeli
DamageSubstantial
OperatorCarisch Mike G
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 425
Seats5

People & Injuries

Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 30 · Second Class

Conditions

ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO

Appendix: Source Data