- Date
- July 24, 2007, 08:45 local (14:45 UTC)
- Place
- Boise, ID
- Injuries
- 2 minor
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N147SHRobinson R22 Beta II
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 29, 2007
- Report
- Approved by Office Director
- Parties
- Federal Aviation Administration
- FAA report
- 20070724014509A
- Case key
- 66315
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The student pilot's failure to maintain rotor rpm resulting in an excessive descent rate and a hard landing. Factors in the accident were the student's failure to relinquish the controls, and the CFI's inadequate supervision.
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.
Analysis
The flight instructor reported that during their fifth practice autorotation, the student let the rotor rpm decay to the point that the certified flight instructor (CFI) attempted to intercede and perform a run on landing. The student and CFI both struggled with each other on the controls until the helicopter hit the ground hard. During the impact sequence, the helicopter spun around, and ultimately came to rest on the left side.
Factual narrative
The flight instructor reported that during their fifth practice autorotation, the student let the rotor rpm decay to the point that the CFI attempted to intercede and perform a run on landing. The student and CFI both struggled with each other on the controls until the helicopter hit the ground hard. During the impact sequence, the helicopter spun around, and ultimately came to rest on the left side.
Aircraft
- Registration
- N147SH
- Reported as
- Robinson R22 Beta II
- Category
- Helicopter
- Serial number
- 4137
- Airframe hours
- 298.7
- Engine
- Lycoming O-360-J2A, 145 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Instructional · Part 91
- Registered owner
- Silver State Helicopters LLC
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · June 1, 2007
- Departed
- Boise, ID
- Airport
- BOI · Boise Air Terminal /Gowen Fld/
Flight crew · 2
As NTSB recorded them. NTSB leaves out names.
- Role
- Flight instructor
- Age
- 30
- Injuries
- Minor
- Certificates
- Commercial, Flight instructor
- Instrument ratings
- Helicopter
- Medical
- Class 2, Without waivers/limitations
- Last flight review
- April 1, 2007
- Seat
- Left
- Flight hours
- 648 total · 477 in this make and model · 578 as pilot in command
- Role
- Student pilot
- Age
- 46
- Injuries
- Minor
- Certificate
- Student
- Medical
- Class 2, Without waivers/limitations
- Last flight review
- April 1, 2007
- Seat
- Right
- Flight hours
- 69 total · 69 in this make and model · 6 as pilot in command · 19 in the last 90 days · 8 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 290° at 8 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 72 °F, dew point 52 °F
- Altimeter
- 29.92 inHg
- Observed at
- BOI
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.