DEN02LA013

NTSB accident investigation · Bell 206B · Bryce, UT · December 1, 2001

Accident · Serious injuriesLimited investigationFinal report
Date
December 1, 2001, 12:15 local (19:15 UTC)
Place
Bryce, UT
Injuries
3 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N911KHBell 206B
Weather
Visual (VMC) · Day
Status
Completed · report December 6, 2002
Report
Approved by Office Director
Parties
FAA Flight Standards District Office
FAA report
20011201033579A
Case key
53859

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

loss of engine power for reasons undetermined. Contributing factors were the low airspeed and altitude at which to perform an autorotation.

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 powerTakeoff - initial climb
Reason for occurrence undeterminedCause
Forced landingEmergency descent/landing
Airspeed - lowFactor
Altitude - lowFactor
Autorotation - performedPilot in command
On ground/water encounter with terrain/waterLanding - roll
Terrain condition - none suitableFactor

Analysis

The helicopter was fueled to capacity the evening before, and the engine compartment was preheated before departure. Preflight inspection revealed no frost on the airframe or rotor blades. The particle separator was clean and dry. Engine start and takeoff were normal. After crossing a highway 1/2 mile south from the heliport, at an airspeed "in excess of 50 mph [and] at an altitude of approximately 50-70 feet," the engine "flamed out." There was a noticeable yaw and the pilot heard "the sound of the engine shutting off." He autorotated towards a highway right-of-way. The helicopter struck the ground hard and slid 20 to 30 feet. "Mast bumping" broke the rotor head off. It struck the rear of the helicopter, severing the tail section. The helicopter spun around and rolled over on its right side. Postaccident examination disclosed no fuel remaining because the rear skid leg had punctured the fuel tank. The pilot and his two passengers had been drenched with fuel when they evacuated the helicopter. All fuel lines and fuel filter were intact, free of debris, and contained fuel. The turbine and compressor turned freely by hand. The pilot said he noted dirt on the inside of the cap "consistent with the dirt at the crash site." Later, he wrote that "the dirt on the inside of the fuel cap was orange, the same color as at the heliport. The dirt at the crash site is more brown native soil." He noted vehicle tracks in the snow behind the helipad. Footprints led from the tire tracks to a small dirt pile and back to the helipad. Suspecting the helicopter may have been sabotaged, the pilot contacted the Federal Bureau of Investigation (FBI) field office in St. George, Utah. He said that in the 6 years the company has been doing business in the Bryce Canyon area, he had been slandered, vandalized, and threatened with death. According to the FBI special agent, his agency would not become involved unless there was "conclusive evidence" that a crime had been committed.

Factual narrative

On December 1, 2001, approximately 1215 mountain standard time, a Bell 206B, N911KH, operated by Alladin Air Service as a nonscheduled domestic passenger sightseeing flight, was substantially damaged when it collided with terrain during a forced landing near Bryce, UT. The pilot and two passengers sustained serious injuries. Day visual meteorological conditions prevailed, and a company VFR flight plan had been filed for the local flight being conducted under Title 14 CFR Part 135. The flight originated at Bryce approximately 1215.

According to the pilot's accident report, the helicopter was fueled to capacity the evening before, and the engine compartment was preheated before departure. His preflight inspection revealed no frost on the airframe and rotor blades. The particle separator was clean and dry. Engine start and takeoff were normal. After crossing a highway 1/2 mile south from the heliport, at an airspeed "in excess of 50 mph [and] at an altitude of approximately 50-70 feet," the engine "flamed out." There was a noticeable yaw and the pilot heard "the sound of the engine shutting off." He autorotated towards a highway right-of-way. The helicopter struck the ground hard and slid 20 to 30 feet. "Mast bumping" broke the rotor head off. It struck the rear of the helicopter, severing the tail section. The helicopter spun around and rolled over on its right side

The passenger in the rear seat videotaped the flight, including the accident sequence, and a copy was made available for examination. As the helicopter sat on the helipad with its rotor blades turning, a male could be seen walking around the front of the helicopter and getting into the right seat. Engine sounds were normal during takeoff and climb-out. Shortly thereafter, a warning horn was clearly audible.

In initial telephone conversations with the pilot, he said he suspected a faulty fuel control unit (FCU) was to blame for the power loss. This was the second "loaner" FCU a Dallas overhaul facility had sent him to use while his FCU was overhauled. He submitted three FAA Form 8130-3s (Airworthiness Approval Tags) for documentation.

The helicopter was transported to the company's hangar at Panguitch Airport where, on December 4 and 5, it was examined by an FAA aviation safety inspector and a Rolls-Royce investigator. Although the pilot said the helicopter had been fueled to capacity, no fuel remained because the rear skid leg had punctured the tank. The pilot and his two passengers had been drenched with fuel when they evacuated the helicopter. All fuel lines and fuel filter were intact, free of debris, and contained fuel. The turbine and compressor turned freely by hand. The pilot wrote, "I also noted the fuel cap, when removed and examined, had dirt on the inside of the cap consistent with the dirt at the crash site."

In an undated letter submitted shortly after the accident, the pilot said he became suspicious about the dirt on the inside of the fuel cap, so he took soil samples from the accident site and from the helipad. "The dirt on the inside of the fuel cap was orange, the same color as at the heliport. The dirt at the crash site is more brown native soil," he wrote. He noted vehicle tracks in the snow behind the helipad. Footprints led from the tire tracks to a small pile of orange-colored dirt and back to the helipad. Suspecting the helicopter may have been sabotaged, the pilot contacted the Federal Bureau of Investigation (FBI) field office in St. George, Utah. He said that in the 6 years the company has been doing business in the Bryce Canyon area, he had been slandered, vandalized, and threatened with death. According to the FBI special agent, his agency would not become involved unless there was "conclusive evidence" that a crime had been committed.

Aircraft

Registration
N911KH
Reported as
Bell 206B
Category
Helicopter
Serial number
1855
Airframe hours
1,016
Engine
Allison 250-C20B, 400 horsepower, turbo shaft
Damage
Substantial damage
Flight
Part 135
Operator
Alladin Air Service
Registered owner
N911KH Corp.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · August 18, 2001 · 24 hours before
Departed
UT77 · Bryce, UT
Flight plan
Company VFR

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
54
Injuries
Minor
Certificates
Commercial, Flight instructor
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
October 5, 2001
Seat
Right
Flight hours
8,147 total · 8,012 as pilot in command · 34 in the last 90 days · 6 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 10 knots
Visibility
10 statute miles
Lowest ceiling
1,300 ft overcast
Temperature
27 °F, dew point 21 °F
Altimeter
30.12 inHg
Observed at
BCE, 4 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.