SEA97LA174

NTSB accident investigation · Bell 47G-3B1 · Idaho Falls, ID · July 22, 1997

Accident · No injuriesLimited investigationFinal report
Date
July 22, 1997, 08:13 local (14:13 UTC)
Place
Idaho Falls, ID
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N3069GBell 47G-3B1
Weather
Visual (VMC) · Day
Status
Completed · report November 6, 1998
Report
Approved by Office Director
FAA report
19970722019469A
Case key
42663

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 pilot-in-command's failure to verify the proper chemical and fuel load aboard prior to takeoff. Factors contributing to the accident were: excessive fuel and chemical loading by ground personnel, tailwind conditions, and high density altitude.

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/waterTakeoff
Weather condition - tailwindFactor
Weather condition - high density altitudeFactor
Aircraft weight and balance - not verifiedPilot in commandCause
Loading of cargo - excessiveGround personnelFactor
Refueling - excessiveGround personnelFactor

Analysis

The pilot requested 15 gallons of fuel and 30 gallons of fungicide prior to takeoff, but was fueled with 40 gallons of fuel and 40 gallons of chemical by his ground crew. He then lifted off with a tailwind during which the rotorcraft settled to the ground, the right skid collapsed and the tailboom separated. The density altitude was approximately 5,500 feet.

Factual narrative

On July 22, 1997, approximately 0813 mountain daylight time, a Bell 47G-3B1, N3069G, registered to Ralph and Dina Reynold, and being operated/flown by a commercial pilot doing business as Eagle Aviation, was substantially damaged during an inflight collision with terrain while taking off from a site slightly northwest of the approach end of runway 02 at Fanning Field, Idaho Falls, Idaho. The pilot was uninjured. Visual meteorological conditions existed and no flight plan had been filed. The flight, which was to have been an aerial application, was to have been operated under 14CFR137.

The pilot reported to the Investigator in Charge that he requested 15 gallons of fuel prior to takeoff, but was fueled with 40 gallons of fuel by ground personnel. Additionally, he requested 30 gallons of spray chemical, but was loaded with 40 gallons by ground personnel. He also reported a tailwind upon takeoff.

The pilot reported to an Inspector from the Federal Aviation Administration's Salt Lake City Flight Standards District Office that he departed downwind with a full load of fungicide during which the helicopter settled to the ground, the right skid collapsed, and the tailboom separated. The pilot reported to the inspector that there were no mechanical problems with the rotorcraft.

The pilot commented in the "Recommendation" section of NTSB Form 6120.1/2 (How could this accident have been prevented): "The loading crew paying more att(ention) and me as a pilot making sure they did what I asked."

Density altitude at Fanning Field at 0746 on the morning of the accident was approximately 5,466 feet.

Aircraft

Registration
N3069G
Reported as
Bell 47G-3B1
Category
Helicopter
Serial number
3376
Airframe hours
5,851
Engine
Lycoming TVO-435, 270 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Wood, Milton, H., doing business as Eagle Aviation
Registered owner
Reynolds, Ralph & Dina
Airworthiness certificate
Special, Restricted (Special)
Airport
IDA · Idaho Falls/Fanning Field

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
51
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine sea, Single-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
12,000 total · 1,200 in this make and model · 365 in the last 90 days · 100 in the last 30 days · 10 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
340° at 4 knots
Visibility
60 statute miles
Lowest ceiling
None
Temperature
57 °F, dew point 52 °F
Altimeter
30.00 inHg
Observed at
IDA, 1 nm away

FAA reports on this event · 1

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