NYC00LA044

NTSB accident investigation · Bell 47G · Coudersport, PA · November 27, 1999

Accident · No injuriesLimited investigationFinal report
Date
November 27, 1999, 16:15 local (21:15 UTC)
Place
Coudersport, PA
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N940BBell 47G
Weather
Visual (VMC) · Day
Status
Completed · report March 2, 2001
Report
Approved by Office Director
FAA report
19991127047829A
Case key
47842

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

On this page

Probable cause

The pilot's improper preflight planning and decision to attempt a takeoff with the passenger from the confined area.

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 objectTakeoff
Object - tree(s)Factor
Planning/decision - improperPilot in commandCause
Loss of control - in flightTakeoff
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The pilot with a passenger, landed the helicopter in a clearing that was about 40 feet wide, by 150 feet long, and surrounded by 'very tall trees.' The pilot said he made a normal run-up and lifted the helicopter to a hover. He used full throttle and maintained 3,100 RPM. When the helicopter started to accelerate forward, at about 12-15 knots, the RPM dropped to 3,000 and the pilot lowered collective to keep the RPM from dropping further. The helicopter's main rotor blades contacted a pine tree about 30 feet above the ground. The helicopter then rolled to the left and impacted the ground. The elevation at the accident site was about 1,800 feet Ms. The pilot did not report any mechanical malfunctions with the helicopter's airframe or engine. After the accident, the pilot stated that the helicopter was with-in it's maximum gross weight; however, the helicopter did not have enough power available to climb and he should have never landed in the clearing.

Factual narrative

On November 27, 1999, about 1615 Eastern Standard Time, a Bell 47G, N940B, was substantially damaged when it struck a tree while departing from a clearing near Coudersport, Pennsylvania. The certificated private pilot and a passenger were not injured. Visual meteorological conditions prevailed and no flight plan had been filed for the personal flight conducted under 14 CFR Part 91.

Earlier in the day, the pilot and passenger departed a private heliport in Glen Rock, Pennsylvania, and flew to the Grand Canyon State Airport (N38), Wellsboro, Pennsylvania, where the helicopter was refueled. They then departed N38, and landed in a clearing, located about 1/2 mile northwest of Coudersport.

According to the pilot, the clearing was about 40 feet wide, by 150 feet long, and was surrounded by "very tall trees." The pilot said he made a normal run-up and lifted the helicopter to a hover. He used full throttle and maintained 3,100 RPM. When the helicopter started to accelerate forward, at about 12-15 knots, the RPM dropped to 3,000 and the pilot lowered collective to keep the RPM from dropping further. The helicopter's main rotor blades contacted a pine tree about 30 feet above the ground. The helicopter then rolled to the left and impacted the ground.

According to a Federal Aviation Administration Inspector, the elevation at the accident site was about 1,800 feet msl.

The pilot did not report any mechanical malfunctions with the helicopter's airframe or engine.

After the accident, the pilot stated that the helicopter was with-in it's maximum gross weight; however, the helicopter did not have enough power available to climb and he should have never landed in the clearing.

Aircraft

Registration
N940B
Reported as
Bell 47G
Category
Helicopter
Serial number
672
Airframe hours
7,510
Engine
Franklin 6V-355-A, 210 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Lawrence W. Vance
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 7, 1999 · 32 hours before
Departed
NONE
Destination
NONE · Glen Rock, PA

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
28
Certificate
Private
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
156 total · 76 in this make and model · 18 as pilot in command · 14 in the last 90 days · 11 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
260° at 12 knots
Visibility
10 statute miles
Lowest ceiling
7,500 ft
Temperature
50 °F, dew point 34 °F
Altimeter
29.00 inHg
Observed at
ELM, 56 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.

Other investigations on N940B · 2

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