FTW98TA099

NTSB accident investigation · Bell 47G-3B-1 · Magdalena, NM · January 15, 1998

Accident · No injuriesFinal report
Date
January 15, 1998, 15:30 local (22:30 UTC)
Place
Magdalena, NM
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N7901SBell 47G-3B-1
Weather
Visual (VMC) · Day
Status
Completed · report February 16, 2001
Report
Approved by Office Director
FAA report
19980115000369A
Case key
20684

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 adequate main rotor rpm. A factor was a lack of recent experience in the type of operation being performed.

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/waterManeuvering
Rotor rpm - not maintainedPilot in commandCause
Lack of recent experience in type operationPilot in commandFactor

Analysis

The helicopter was being used in the Federal Government's predator control program. The pilot said he and his passenger were flying north and entered a draw. The prey they were chasing (a coyote) turned east and they flew over it at low airspeed and altitude. The pilot was having 'trouble maintaining rotor rpm.' With higher terrain in front and to his left, he elected to turn east in hopes of exiting the draw to the south. Trees and rough terrain forced him to continue eastward. The pilot found himself below a draw and he pulled collective control. This aggravated the low rpm condition, but the helicopter cleared the rim. On the other side of the rim, the ground sloped down at a 40 degree angle and the pilot tried to stretch his descent towards flatter terrain in an attempt to make a run-on landing. The helicopter impacted the terrain and was substantially damaged. The FAA inspector who went to the scene wrote, 'There is no apparent reason for the helicopter to have lost rpm. Review of the pilot records indicate only 14 hours of flight time in the last 90 days and no training in the last three years, and the last biennial flight review was almost 20 months ago.'

Factual narrative

On January 15, 1998, approximately 1530 mountain standard time, a Bell 47G-3B-1, N7901S, was substantially damaged when it collided with terrain while maneuvering near Magdalena, New Mexico. The commercial pilot and a passenger escaped injury. Visual meteorological conditions prevailed, and no flight plan was filed for the public use flight being conducted under Title 14 CFR Part 91. The flight originated from a ranch near Magdalena.

The helicopter was being used in the Federal Government's predator control program. The pilot said he and his passenger were flying north and entered a draw. The prey they were chasing (a coyote) turned east and they flew over it at low airspeed and altitude. The pilot was having "trouble maintaining rotor rpm." With higher terrain in front and to his left, he elected to turn east in hopes of exiting the draw to the south. Trees and rough terrain forced him to continue eastward. The pilot found himself below a draw and he pulled collective control. This aggravated the low rpm condition, but the helicopter cleared the rim. On the other side of the rim, the ground sloped down at a 40 degree angle and the pilot tried to stretch his descent towards flatter terrain in an attempt to make a run-on landing. The tail rotor guard and both skids contacted the ground and the helicopter slid 10 feet before striking a small drainage. The right skid dug into soft dirt and "catapulted the helicopter nose down into the air, tearing loose the right skid." The helicopter started to roll to the left. A main rotor blade struck the ground and pitched the helicopter back to the right. The helicopter came to rest upright. The tail boom was severed.

A Federal Aviation Administration inspector was dispatched to the scene. In his accident report (FAA Form 8020-23) the inspector wrote, "Airmen competency is in question because with the existing conditions, there is no apparent reason for the helicopter to have lost rpm. Review of the pilot records indicate only 14 hours of flight time in the last 90 days and no training in the last three years, and the last biennial flight review was almost 20 months ago."

Aircraft

Registration
N7901S
Reported as
Bell 47G-3B-1
Category
Helicopter
Serial number
6576
Airframe hours
3,293
Engine
Lycoming TVO-435-B1A, 270 horsepower, reciprocating
Damage
Substantial damage
Flight
Public aircraft · Part 91
Registered owner
Desert Eagle Helicopters Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · January 4, 1998 · 10 hours before
Departed
NONE · Magdalena, NM

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
38
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
1,877 total · 377 in this make and model · 1,799 as pilot in command · 14 in the last 90 days · 12 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
360° at 5 knots, gusting 12
Visibility
10 statute miles
Lowest ceiling
None
Temperature
50 °F

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 N7901S · 3

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