LAX05TA306

NTSB accident investigation · Bell 407 · Inyokern, CA · September 21, 2005

Accident · No injuriesFinal report
Date
September 21, 2005, 10:07 local (17:07 UTC)
Place
Inyokern, CA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N702WPBell 407
Weather
Visual (VMC) · Day
Status
Completed · report April 25, 2006
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20050921023489A
Case key
62516

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 failed to maintain tail rotor clearance from obstacles during landing.

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 objectLanding
Rotor system,tail rotor blade - blade strike
Clearance - not maintainedPilot in commandCause

Analysis

The helicopter's tail rotor struck a rock outcropping during a confined landing at a remote mountain site. The pilot was moving two surveyors up the side of the southern slope of a mountain canyon. He dropped the surveyors off at a small saddle on a ridge, and departed to locate the next site upslope. He found a rocky outcropping that he thought would be a good landing site, and made one approach, but did not like the location due to uneven terrain. He then hovered over to another site a few yards away and proceeded to land. During the landing the tail rotor made contact with a small rock outcropping. Feeling the contact he proceeded to execute a successful autorotative landing from a hover.

Factual narrative

On September 21, 2005, about 1007 Pacific daylight time, a Bell 407, N702WP, tail rotor struck a rock outcropping during a confined area landing 8.6 miles northwest of the Inyokern Airport, Inyokern, California. Los Angeles City Department of Water and Power operated the helicopter under the provisions of 14 CFR Part 91. The airline transport pilot was not injured and the helicopter was substantially damaged. Visual meteorological conditions prevailed, and a company flight plan was in effect. The public-use flight originated at Hokinson Heliport, Sylmar, California, at 0630.

The pilot stated in the Pilot/Operator Aircraft Accident Report (NTSB Form 6120 1/2) that he was moving two surveyors up the side of the southern slope of a mountain canyon. He dropped the surveyors off at a small saddle on a ridge and departed to locate the next site upslope. He found a rocky outcropping that he thought would be a good landing site, and made one approach, but did not like the location due to uneven terrain. He then hovered over to another site a few yards away and proceeded to land. During the landing the tail rotor made contact with a small rock outcropping. Feeling the contact he proceeded to execute a successful autorotative landing from a hover.

Aircraft

Registration
N702WP
Reported as
Bell 407
Category
Helicopter
Serial number
53543
Airframe hours
1,498.1
Engine
Rolls-Royce C-47B, 674 horsepower, turbo shaft
Damage
Substantial damage
Flight
Public aircraft - local · Part 91
Registered owner
Los Angeles City Water and Power
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 1, 2005 · 19 hours before
Departed
KVNY · Van Nuys, CA
Destination
KIKY · Inyokern, CA
Flight plan
Company VFR
Airport
KIYK · Inyokern

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
58
Injuries
None
Certificates
Flight instructor, Airline transport
Airplane ratings
Single-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2
Last flight review
May 1, 2005
Seat
Right
Flight hours
15,800 total · 800 in this make and model · 13,600 as pilot in command · 90 in the last 90 days · 45 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 5 knots
Visibility
60 statute miles
Lowest ceiling
None
Temperature
66 °F, dew point 63 °F
Altimeter
30.11 inHg
Observed at
KNID, 12 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.