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NTSB Report
September 3, 2005 · West Revolution Mini 500 · N20925
Ida, MI
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 3, 2005
Injury Outcomes
No injuries (1 uninjured)
Location
Ida, MI
Aircraft
West Revolution Mini 500
Tail Number
N20925
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI05CA267
The pilot reported that the amateur-built helicopter was in cruise flight at 1,750 feet mean sea level when the main rotor contacted the tail boom. He stated that the engine tachometer began indicating near the high operating limit. At the same time the rotor tachometer was indicating near the low operating limit. His attempt to correct the condition was not successful. The pilot stated that he lowered the collective and the helicopter pitched forward. He reported that when he compensated for the forward pitch the main rotor blades struck the tail boom. He then turned into the wind and entered an autorotation. The pilot stated that a post accident examination revealed that the engine tachometer was providing false indications and improperly indicated an engine overspeed condition.
NTSB Probable Cause
The pilot's abrupt (improper) control action which resulted in the main rotor contacting the tail boom. Contributing factors were the false indication provided by the engine tachometer, the pilot's decision to immediately initiate an autorotation instead of performing a precautionary landing, and the corn field encountered during landing.
Full Narrative
This report is based on information received by the NTSB. Additional details may be found in the NTSB's public docket for this case. For further information, please contact the NTSB Office of Public Inquiries.
Flight
Event TypeAccident
Event Time13:15 EDT
Nearest AirportLADA (5nm)
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftWest Revolution Mini 500
Tail NumberN20925
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsRotax · 582 · Reciprocating · 65
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 60 · None · None
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 9 kt
Visibility10 sm
CeilingBroken clouds 7000 ft
Temperature / Dew Point54
Altimeter30.18 inHg
Observation Time17:16
Weather SourceWFAC