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NTSB Final Report: Mountain Wooster, Ohio

Location:

Wooster, Ohio

Accident Number:

CEN20LA264

Date & Time:

July 4, 2020, 13:57 Local

Registration:

N263MH

Aircraft:

Mbb BK117

Aircraft Damage:

Substantial

Defining Event:

Miscellaneous/other

Injuries:

4 None

Flight Conducted Under: Part 135: Air taxi & commuter - Non-scheduled - Air Medical (Medical emergency)

Analysis

During departure from a portable dolly, the helicopter crew flew over an area where silt construction fencing was installed. While the helicopter flew about 10 ft above ground level and over the fence, the fence became unsecured and blew up and into the main rotor system. The crew then performed a forced landing, which resulted in substantial damage to the fuselage, tailboom, and tail rotor blades.

Although the crew was aware of the fence, they did not believe it would be a factor during the departure because they had previously flown over it with no issues.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The entanglement of construction fencing into the main rotor system, which necessitated a forced landing that resulted in substantial damage to the helicopter.

Findings

Environmental issues                    Fence/fence post - Effect on equipment

Factual Information

On July 4, 2020, about 1357 eastern daylight time (EDT), an Airbus Helicopter BK117, N263MH, was substantially damaged when it was involved in an accident at Wayne County Airport (KBJJ), Wooster, Ohio. The two commercial pilots sustained no injuries. The helicopter was operated as a Title 14 Code of Federal Regulations (CFR) Part 135 helicopter air ambulance flight.

Surveillance video showed that after lifting off a portable dolly, the helicopter turned right and briefly hovered. As the helicopter began to take off following the hover, it traversed a grassy area adjacent to the ramp about 10 ft above ground level, where a silt construction fence was obscured by tall grass. As the helicopter overflew, the fence became unsecured and blew up and into the main and tail rotor system. The crew then performed a forced landing, which resulted in substantial damage to the fuselage, tailboom, and tail rotor blades.

At the time of the accident, there were no notices to air missions for the construction fence, and the presence of the fence was not contained within any publications or notices available to pilots.

According to the pilots, the construction in the area of the fencing had started about 2 months prior to the accident and that coincided with the installation of the fence. One of the pilots stated that he had inspected the fence himself and remembered the bottom being buried in the ground about 4 to 6 inches and attached to wooden stakes with staples and nails. He said, regarding the silt fence, that he “never imagined it would come out at that altitude.” The second pilot stated that he had flown over it so many times, he did not take notice of it as a factor.

History of Flight

Taxi-to runway                             Miscellaneous/other (Defining event)

Pilot Information

Certificate:

Commercial

Age:

56,Male

Airplane Rating(s):

None

Seat Occupied:

Left

Other Aircraft Rating(s):

Helicopter

Restraint Used:

5-point

Instrument Rating(s):

Helicopter

Second Pilot Present:

Yes

Instructor Rating(s):

None

Toxicology Performed:

No

Medical Certification:

Class 1 With waivers/limitations

Last FAA Medical Exam:

October 8, 2019

Occupational Pilot:

Yes

Last Flight Review or Equivalent:

March 25, 2020

Flight Time:

5844 hours (Total, all aircraft), 1827 hours (Total, this make and model), 2419 hours (Pilot In Command, all aircraft), 40 hours (Last 90 days, all aircraft), 20 hours (Last 30 days, all aircraft), 2 hours (Last 24 hours, all aircraft)

Pilot Information

Certificate:

Commercial

Age:

41,Male

Airplane Rating(s):

None

Seat Occupied:

Right

Other Aircraft Rating(s):

Helicopter

Restraint Used:

5-point

Instrument Rating(s):

Helicopter

Second Pilot Present:

Yes

Instructor Rating(s):

None

Toxicology Performed:

 

Medical Certification:

Class 1 Without waivers/limitations

Last FAA Medical Exam:

November 22, 2019

Occupational Pilot:

Yes

Last Flight Review or Equivalent:

March 7, 2020

Flight Time:

2970 hours (Total, all aircraft), 750 hours (Total, this make and model), 2250 hours (Pilot In Command, all aircraft), 20 hours (Last 90 days, all aircraft), 13 hours (Last 30 days, all aircraft), 2 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make:

Mbb

Registration:

N263MH

Model/Series:

BK117 C2

Aircraft Category:

Helicopter

Year of Manufacture:

2009

Amateur Built:

 

Airworthiness Certificate:

Normal

Serial Number:

9311

Landing Gear Type:

None; Skid

Seats:

6

Date/Type of Last Inspection:

June 23, 2020 AAIP

Certified Max Gross Wt.:

7903 lbs

Time Since Last Inspection:

 

Engines:

2 Turbo shaft

Airframe Total Time:

4988.9 Hrs as of last inspection

Engine Manufacturer:

Safran

ELT:

C126 installed, not activated

Engine Model/Series:

Arriel 1E2

Registered Owner:

 

Rated Power:

739 Horsepower

Operator:

 

Operating Certificate(s) Held:

On-demand air taxi (135)

Operator Does Business As:

 

Operator Designator Code:

HDNA

Meteorological Information and Flight Plan

Conditions at Accident Site:

Visual (VMC)

Condition of Light:

Day

Observation Facility, Elevation:

KBJJ,1147 ft msl

Distance from Accident Site:

0 Nautical Miles

Observation Time:

12:56 Local

Direction from Accident Site:

 

Lowest Cloud Condition:

Clear

Visibility

10 miles

Lowest Ceiling:

None

Visibility (RVR):

 

Wind Speed/Gusts:

7 knots /

Turbulence Type Forecast/Actual:

None / None

Wind Direction:

60°

Turbulence Severity Forecast/Actual:

N/A / N/A

Altimeter Setting:

30.03 inches Hg

Temperature/Dew Point:

30°C / 18°C

Precipitation and Obscuration:

No Obscuration; No Precipitation

 

Departure Point:

Wooster, OH

Type of Flight Plan Filed:

Company VFR

Destination:

Oberlin, OH

Type of Clearance:

None

Departure Time:

Type of Airspace:

Class C

Airport Information

Airport:

Wayne County BJJ

Runway Surface Type:

 

Airport Elevation:

1135 ft msl

Runway Surface Condition:

Dry

Runway Used:

 

IFR Approach:

None

Runway Length/Width:

 

VFR Approach/Landing:

None

Wreckage and Impact Information

Crew Injuries:

4 None

Aircraft Damage:

Substantial

Passenger Injuries:

 

Aircraft Fire:

None

Ground Injuries:

 

Aircraft Explosion:

None

Total Injuries:

4 None

Latitude, Longitude:

40.873611,-81.883888(est)

Administrative Information

Investigator In Charge (IIC):

Williams, David

 

Additional Participating Persons:

Arnold Wolfe; FAA; Cleveland, OH

 

Original Publish Date:

March 18, 2022                                                                  Investigation Class:

3

Note:

The NTSB did not travel to the scene of this accident.

 

Investigation Docket:

https://data.ntsb.gov/Docket?ProjectID=101540

 





Created 147 days ago
by Admin

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