DFW08CA177

NTSB accident investigation · Robinson R44 II · Canyon Lake, TX · July 5, 2008

Accident · Minor injuriesData collectionFinal report
Date
July 5, 2008, 16:00 local (21:00 UTC)
Place
Canyon Lake, TX
Injuries
1 minor, 2 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N804DFRobinson R44 II
Defining event
Maneuvering-hover: Loss of tail rotor effectiveness
Weather
Visual (VMC) · Day
Status
Completed · report August 28, 2008
Report
Approved by Office Director
Parties
San Antonio FSDO
FAA report
20080705839879A
Case key
68395

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

A total loss of tail rotor effectiveness. Contributing to the accident was the pilot's improper decision to operate inside the height velocity curve.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: prop/rotor parametersAircraft › Aircraft oper/perf/capability · Capability exceededRobinson Helicopter R44 II: 17 casesAll aircraft: 182 casesProbable cause
Performance/control parametersAircraft › Aircraft oper/perf/capability · Not specifiedRobinson Helicopter R44 II: 25 casesAll aircraft: 1,269 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The commercial pilot was conducting a photo flight with himself and two passengers in the four seat helicopter. The helicopter had been in a zero airspeed out of ground effect hover at approximately 40 to 50 feet above the ground for about 15 seconds when the pilot applied power to begin a vertical climb. According to the pilot, he then suddenly and without warning lost directional control, the helicopter began to spin nose right, and his application of full left pedal had no effect. The pilot initiated an autorotation and the helicopter landed hard on rough rocky sloping terrain between several trees. The crash caused substantial damage to the fuselage and airframe when the left skid gear partially collapsed and penetrated into the left rear passenger cabin floor area. The upper pylon was noticeably bent and wrinkled, and both main rotor blades were damaged. An on-scene investigation by an FAA maintenance inspector confirmed continuity and no apparent damage to the flight controls. There was no post-crash fire and the pilot and front seat passenger reported no injuries, but the left rear seat passenger suffered minor injuries and had to be carried out of the aircraft. The pilot reported the surface winds were light and variable, visibility 10 statute miles with scattered clouds at 3,000 feet, a temperature of 88 degrees, and an altimeter setting of 30.01 inches of mercury.

Factual narrative

The commercial pilot was conducting a photo flight with himself and two passengers in the four seat helicopter. The helicopter had been in a zero airspeed out of ground effect hover at approximately 40 to 50 feet above the ground for about 15 seconds when the pilot applied power to begin a vertical climb. According to the pilot, he then suddenly and without warning lost directional control, the helicopter began to spin nose right, and his application of full left pedal had no effect. The pilot initiated an autorotation and the helicopter landed hard on rough rocky sloping terrain between several trees. The crash caused substantial damage to the fuselage and airframe when the left skid gear partially collapsed and penetrated into the left rear passenger cabin floor area. The upper pylon was noticeably bent and wrinkled, and both main rotor blades were damaged. An on-scene investigation by an FAA maintenance inspector confirmed continuity and no apparent damage to the flight controls. There was no post-crash fire and the pilot and front seat passenger reported no injuries, but the left rear seat passenger suffered minor injuries and had to be carried out of the aircraft. The pilot reported the surface winds were light and variable, visibility 10 statute miles with scattered clouds at 3,000 feet, a temperature of 88 degrees, and an altimeter setting of 30.01 inches of mercury.

Aircraft

Registration
N804DF
Reported as
Robinson R44 II
Category
Helicopter
Serial number
11265
Airframe hours
421
Engine
Lycoming IO-540-AE1A5, 205 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial observation · Part 91
Operator
Helicopter Tours of Texas
Registered owner
Royal Aeronautical Services USA LLC
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · June 1, 2008
Departed
Gruene, TX
Airport
34TS · Canyon Lake

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
60
Injuries
None
Certificate
Commercial
Medical
Class 2, With waivers/limitations
Last flight review
October 1, 2007
Seat
Right
Flight hours
731 total · 113 in this make and model · 569 as pilot in command · 49 in the last 90 days · 21 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
88 °F
Altimeter
30.01 inHg

FAA reports on this event · 1

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

Other investigations on N804DF · 2

Matched to the same aircraft by N-number and date.