LAX92LA114

NTSB accident investigation · Bell 206BIII · San Ardo, CA · February 10, 1992

Accident · Minor injuriesLimited investigationFinal report
Date
February 10, 1992, 10:00 local (18:00 UTC)
Place
San Ardo, CA
Injuries
1 minor, 3 uninjured
Damage
Substantial damage
Phase of flight
Standing
Aircraft
N3903LBell 206BIII
Weather
Visual (VMC) · Day
Status
Completed · report August 13, 1993
Report
Approved by Office Director
FAA report
19920210002349A
Case key
27555

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 decision to land in a plowed field made soft from winter rain shower activity.

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.

Roll overStanding - engine(s) operating
Terrain condition - none suitableFactor
Terrain condition - softFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause

Analysis

The pilot stated that the purpose of the flight was to investigate the cause of an electrical power outage in the area. He had three power company patrolmen on board. After patrolling various power lines and spur connections, they came to a pole that the patrolman in the left front seat wanted to inspect more closely. After hovering near the pole for a short time patrolman asked if they could land. The pilot said he inspected the landing area, choosing a fairly level spot and touched down. As he lowered the collective, the skids sank into the soil. Stabilizing the helicopter with cyclic, he told two patrolmen on the left side to deplane. They disembarked, closing the doors. Suddenly the soil under the left rear skid tube gave way and the helicopter tipped left and to the rear, where the tail rotor struck the ground. The helicopter continued to roll left and the main rotor struck the ground. Post accident examination of the ground revealed that it was soft, recently plowed dirt moist from recent rain.

Aircraft

Registration
N3903L
Reported as
Bell 206BIII
Category
Helicopter
Serial number
3230
Airframe hours
4,102
Engine
Allison 250C-20B, 420 horsepower, turbo shaft
Damage
Substantial damage
Fire
On-Ground
Flight
Other work use · Part 91
Operator
Aris Helicopters, Ltd.
Registered owner
Aris Helicopters, Ltd.
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · December 15, 1991 · 34 hours before
Departed
KIC · King City, CA
Airport
Plowed Field

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
43
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Right
Flight hours
6,950 total · 800 in this make and model · 6,850 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
130° at 15 knots
Visibility
10 statute miles
Lowest ceiling
2,500 ft broken
Temperature
50 °F
Altimeter
29.00 inHg

FAA reports on this event · 1

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