LAX06CA180

NTSB accident investigation · Bell 47-G5 · Soledad, CA · May 23, 2006

Accident · No injuriesData collectionFinal report
Date
May 23, 2006, 07:20 local (14:20 UTC)
Place
Soledad, CA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N4741RBell 47-G5
Weather
Visual (VMC) · Day
Status
Completed · report October 3, 2006
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20060523010029A
Case key
63750

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

fuel exhaustion due to the pilot's inaccurate fuel consumption calculations and failure to refuel the helicopter which resulted in a loss of engine power.

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.

Loss of engine power(total) - nonmechanicalManeuvering - aerial application
Fluid,fuel - exhaustionCause
Fuel consumption calculations - inaccuratePilot in commandCause
Refueling - not performedPilot in commandCause
Forced landingEmergency descent/landing
In flight collision with terrain/waterEmergency descent/landing
Terrain condition - ground

Analysis

The helicopter crashed in a field following a loss of engine power due to fuel exhaustion. The pilot performed a preflight and checked the fuel quantity prior to departure. The level in the tank was approximately 1 inch below the cap. The pilot left the operator's facility approximately 0525. From 0525 to 0715 he sprayed 14 loads on various fields, totaling approximately 99 minutes of flight. As the pilot was flying to his next job, the engine lost power, about 0720. At this point, the helicopter's fuel gauges read about 1/4 full and he assumed that he had 10-15 minutes of fuel remaining. When the engine lost power he lowered the collective and turned into the wind, then the helicopter impacted the ground. The pilot stated that the helicopter and engine had no mechanical failures or malfunctions during the flight. The operator said the helicopter has an engine that burns about 16 gallons of fuel per hour. It also has a capacity of 28 gallons of usable fuel, which equates to approximately 105 minutes of fuel. According to the pilot's statement he flew about 99 minutes. The operator said that with the fuel down about an inch when the pilot started, fuel exhaustion was inevitable. The pilot was instructed to refuel every hour or every 10 loads. Each load takes approximately 6 minutes.

Factual narrative

On May 23, 2006, about 0720 Pacific daylight time, a Bell 47-G5, N4741R, crashed in a field following a loss of engine power near Soledad, California. The owner was operating the helicopter under the provisions of 14 CFR Part 137. The commercial pilot, the sole occupant, was not injured; the helicopter sustained substantial damage. The aerial application flight departed from the Soilserv Soledad Yard, about 0520, with a planned destination of R.C. Salmina Ranch. Visual meteorological conditions prevailed, and no flight plan had been filed.

The pilot submitted a written report. He performed a preflight at 0505, and checked the fuel quantity with his fingers. The level in the tank was approximately 1 inch below the cap. About 0520 he started the engine. The pilot left Soledad yard at 0525. He flew about 5 minutes to the next field, landed, and shutoff the helicopter to wait for the truck. About 0550 he started the engine again and sprayed three loads on the first field. Ten minutes later, the pilot flew to the second field. He had to land and shutdown the engine because of ground crew problems. About 0620 he started the helicopter again and sprayed the second field with two loads. From 0625 to 0715 he sprayed nine loads on three different fields, all within 700 feet of the truck.

The pilot flew south to his next job and was going to land to wait for the truck. The engine quit about 0720, and the helicopter's fuel gauges read about 1/4 full. According to his watch he assumed that he had 10-15 minutes of fuel remaining. When the engine quit he lowered the collective and turned into the wind. The next thing he recalled was hitting the ground.

The pilot stated that the helicopter and engine had no mechanical failures or malfunctions during the flight.

The operator submitted a statement. The Bell 47-G5 helicopter has an engine that burns about 16 gallons of fuel per hour. It also has 28 gallons of usable fuel on board. This equates to approximately 105 minutes of fuel. According to the pilot's statement he flew about 99 minutes. With the fuel down about an inch when he started, fuel exhaustion was inevitable. The pilot was instructed to refuel every hour or every 10 loads. Each load takes approximately 6 minutes.

Aircraft

Registration
N4741R
Reported as
Bell 47-G5
Category
Helicopter
Serial number
7917
Airframe hours
23,407
Engine
Lycoming VO-135-B1A, 270 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Soilserv Inc.
Airworthiness certificate
Special, Restricted (Special)
Last inspection
100 hour · May 1, 2006 · 25 hours before
Departed
Soledad, CA
Destination
Salmina Ranch, CA

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
36
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2
Last flight review
October 1, 2005
Seat
Left
Flight hours
5,200 total · 310 in this make and model · 5,200 as pilot in command · 200 in the last 90 days · 60 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
57 °F, dew point 52 °F
Altimeter
30.13 inHg
Observed at
SNS, 20 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.

Other investigations on N4741R · 1

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