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NTSB Report
June 18, 2007 · Robinson R22 BETA II · N712U
Park City, UT
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
June 18, 2007
Injury Outcomes
No injuries (2 uninjured)
Location
Park City, UT
Aircraft
Robinson R22 BETA II
Tail Number
N712U
Operator
Upper Limit Aviation
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA07CA171
The flight instructor said that he was on a cross-country training flight with a student. He said he was going to demonstrate an emergency autorotation to an open plateau with an elevation of approximately 7,000 feet. The flight instructor said the autorotation went well. But when he completed a right pedal turn to taxi back and applied left pedal to stop the yaw, the low rotor RPM horn sounded. He lowered the collective and rolled on the throttle as the helicopter settled to the ground. The left skid impacted first, bending the left aft skid support tube, which transmitted to the fuselage structure bending and deforming it.
NTSB Probable Cause
The pilot's failure to maintain rotor RPM during hover taxi. A contributing factor was the high density altitude weather condition.
Full Narrative
The flight instructor said that he was on a cross-country training flight with a student. He said he was going to demonstrate an emergency autorotation to an open plateau with an elevation of approximately 7,000 feet. The flight instructor said the autorotation went well. But when he completed a right pedal turn to taxi back and applied left pedal to stop the yaw, the low rotor RPM horn sounded. He lowered the collective and rolled on the throttle as the helicopter settled to the ground. The left skid impacted first, bending the left aft skid support tube, which transmitted to the fuselage structure bending and deforming it.
Flight
Event TypeAccident
Event Time13:20 MDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson R22 BETA II
Tail NumberN712U
Aircraft CategoryHeli
DamageSubstantial
OperatorUpper Limit Aviation
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-J2A · Reciprocating · 145
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 21 · Second Class · None
Crew 2Age 35 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
Wind260° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point27 C
Altimeter30.11 inHg
Observation Time19:15
Weather SourceWFAC