ANC05TA111

NTSB accident investigation · McDonnell Douglas 500D · Delta Junction, AK · July 28, 2005

Accident · No injuriesFinal report
Date
July 28, 2005, 12:30 local (20:30 UTC)
Place
Delta Junction, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
C-GBUYMcDonnell Douglas 500D
Weather
Visual (VMC) · Day
Status
Completed · report April 25, 2006
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA Anchorage, FSDO-03
Case key
62332

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

The pilot's failure to maintain clearance from trees during the approach to landing, which resulted in the main rotor blades striking a tree. A factor associated with the accident was the tree.

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.

In flight collision with objectLanding - flare/touchdown
Object - tree(s)Factor
Altitude/clearance - not maintainedPilot in commandCause

Analysis

The airline transport certificated pilot, flying in support of a public use operation, landed the helicopter at an off-airport site to pickup two passengers. After takeoff, the passengers told the pilot that the main rotor blades contacted a small tree during landing. Upon landing at his destination, the pilot inspected the blades, and found dents/scratches in the bottom skins of the blades. The blades were determined to be damaged beyond repair.

Factual narrative

On July 28, 2005, about 1230 Alaska daylight time, a McDonnell Douglas 500D helicopter, Canadian registration C-GBUY, sustained substantial damage during landing when its main rotor blades contacted a small tree at an off-airport landing site, about 49 miles northeast of Delta Junction, Alaska. The helicopter was being operated by the U. S. Department of the Interior, Anchorage, Alaska, as a visual flight rules (VFR) public use flight when the accident occurred. The solo airline transport pilot was not injured. Visual meteorological conditions prevailed, and company flight following procedures were in effect. The flight originated about 1220 at another off-airport site, about 30 miles northeast of Delta Junction.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on July 28, the director of operations for Prism Helicopters, of Pitt Meadows, Canada, noted his company was operating under contract to the U.S. Department of Interior. He related that the pilot of the accident helicopter had reported that the main rotor blades contacted a small tree during landing at an off-airport site, and the extent of the damage to the blades was unknown. He said the pilot reported taking off with two passengers who told him the main rotor blades contacted the tree when he landed to pick them up.

In a written statement to the NTSB prepared on July 30, the pilot wrote that he landed in the landing zone, and picked up two workers. During the return flight, he said the workers told him the rotor blades had contacted a small spruce tree when he landed to pick them up. He wrote that he felt a slight feedback in the cyclic control during landing, but didn't think it was anything. Upon landing, he said he examined the blades, and found scratches/dents in the bottom skins of the rotor blades.

During a telephone conversation with the NTSB investigator-in-charge on August 27, the director of operations for the operator said the rotor blades were damaged beyond repair.

Aircraft

Registration
C-GBUY
Reported as
McDonnell Douglas 500D
Category
Helicopter
Airframe hours
14,460
Engine
Allison C-20-B, 420 horsepower, turbo shaft
Damage
Substantial damage
Flight
Public aircraft - federal · Part 91
Operator
U. S. Department of the Interior
Registered owner
Prism Helicopters Inc.
Airworthiness certificate
Standard, Utility
Last inspection
100 hour · July 1, 2005 · 58 hours before
Departed
Last Chance, AK
Destination
Delta Junction, AK
Flight plan
Company VFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
61
Injuries
None
Certificates
Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane, Helicopter
Medical
Class 2, With waivers/limitations
Last flight review
April 1, 2005
Seat
Front
Flight hours
13,358 total · 2,680 in this make and model · 12,548 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
1.5 statute miles
Lowest ceiling
None
Temperature
57 °F
Altimeter
29.92 inHg