FTW85FA310

NTSB accident investigation · Bell UH-1B · Saint James, LA · August 8, 1985

Accident · FatalField investigationFinal report
Date
August 8, 1985, 12:15 local (17:15 UTC)
Place
Saint James, LA
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N1385WBell UH-1B
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19850808037719A
Case key
21567

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

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(partial) - mech failure/malfHover
Compressor assembly,blade - failure,totalCause
Compressor assembly,blade - fatigueCause
Forced landingDescent - emergency
Loss of control - in flightDescent - emergency
Rotor rpm - not possiblePilot in commandCause
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - none suitableFactor
Terrain condition - high vegetationFactor

Analysis

Acft was at a 150' hover preparing to pick up a log when it experienced a power loss. Witnesses stated that they heard a loud 'bang' and the pilot radioed 'get out of the way'. Acft autorotated thru 60' to 80' trees with very low rotor RPM and impacted with no horz speed and high vertical speed. Investigation revealed that eng had experienced severe internal damage. Four compressor blades from the 4th stage rotor were found to have suffered progressive fatigue failure, which in turn caused the remainder of the blades on the 4th and 5th stages to separate leading to an eng surge and loss of power. The accident occurred in a flt regime from which the plt could not affect a recovery from the eng failure.

Aircraft

Registration
N1385W
Reported as
Bell UH-1B
Category
Helicopter
Serial number
62-2072
Airframe hours
5,763
Engine
Lycoming T53-11D, 1,000 horsepower, turbo shaft
Damage
Destroyed
Flight
Other work use · Part 133
Operator
Skyline Air Service, Inc.
Airworthiness certificate
Special, Restricted (Special)
Last inspection
AAIP · August 6, 1985 · 4 hours before

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
Certificate
Commercial
Instrument ratings
Helicopter
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Toxicology
Performed

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None

FAA reports on this event · 1

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