SEA97LA191

NTSB accident investigation · Bell 47G · Wellpinit, WA · August 17, 1997

Accident · Minor injuriesLimited investigationFinal report
Date
August 17, 1997, 13:00 local (20:00 UTC)
Place
Wellpinit, WA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9571Bell 47G
Weather
Visual (VMC) · Day
Status
Completed · report May 4, 1998
Report
Approved by Office Director
FAA report
19970817025889A
Case key
42676

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 NTSB’s determination of the probable cause, and any contributing factors.

The pilot's selection of an unsuitable landing site, and his failure to maintain rotor blade clearance from terrain during landing.

Analysis

As the pilot was landing the helicopter on a gravel bar on a bank of the Spokane River, a main rotor blade contacted the bank. The helicopter dropped and tumbled onto the rocks. The pilot reported that there were no preimpact mechanical malfunctions. According to records kept by the Federal Aviation Administration (FAA), the pilot was operating a restricted-category aircraft on a personal flight. Also, the pilot's FAA Third Class Medical Certificate had expired about 8 months prior to the accident.

Factual narrative

On August 17, 1997, about 1300 Pacific daylight time, N9571, a Bell 47G helicopter, operated by the owner/pilot, impacted terrain and was substantially damaged during landing near Wellpinit, Washington. The private pilot, the sole occupant, received minor injuries. Visual meteorological conditions prevailed and no flight plan had been filed. The personal flight was conducted under 14 CFR 91.

According to an officer with the Bureau of Indian Affairs who arrived at the accident site, no mechanical malfunctions were reported. The officer stated that the pilot was attempting to land on a gravel bar on a bank of the Spokane River. During the landing, a main rotor blade contacted the ground and the helicopter tumbled onto the rocks.

In a written statement to the Safety Board (attached), the pilot stated: "I flew to the lake and circled the landing area once. I then came in from over the water and intended to land on the beach. As I was landing on the beach, the [main rotor] blade struck the bank to the left of the helicopter. I then dropped the last 2 or 3 feet to the beach."

The pilot also reported that there were no preimpact mechanical malfunctions. According to records kept by the Federal Aviation Administration (FAA), the pilot was operating a restricted-category aircraft on the personal flight. Also, the pilot's FAA Third Class Medical Certificate had expired about 8 months prior to the accident.

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 terrain/waterLanding
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Lack of certificationPilot in command
Clearance - not maintainedPilot in commandCause
Roll overLanding

Aircraft

Registration
N9571
Reported as
Bell 47G
Category
Helicopter
Serial number
7504
Airframe hours
6,500
Engine
Lycoming VO-540, 280 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Bingham, Larry
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · April 6, 1995 · 150 hours before
Departed
Selah, WA

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
42
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, Expired
Seat
Left
Flight hours
1,100 total · 250 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
50 statute miles
Lowest ceiling
None
Temperature
81 °F

FAA reports on this event · 1

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