CEN13LA546

NTSB accident investigation · Brantly B-2B · Rothbury, MI · August 29, 2013

Accident · Minor injuriesLimited investigationFinal report
Date
August 29, 2013, 16:43 local (20:43 UTC)
Place
Rothbury, MI
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N2253UBrantly B-2B
Defining event
Maneuvering: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report November 13, 2014
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA FSDO Grand Rapids
FAA report
20130829017319A
Case key
88035

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 failure to maintain helicopter control while turning to avoid trees during an aborted takeoff in gusting wind conditions.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBrantly B-2B: 6 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: prop/rotor parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedBrantly B-2B: 2 casesAll aircraft: 182 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationBrantly B-2B: 4 casesAll aircraft: 1,199 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported that he initiated a takeoff in light and variable wind conditions from the middle of a private field. During the takeoff, the pilot initiated a left pedal turn to abort the takeoff, likely in an attempt to avoid trees. During the left pedal turn, a wind gust forced the helicopter toward the ground. The helicopter subsequently impacted the ground hard at a near-level attitude on an uphill slope. The main rotor blade struck the ground, and the helicopter then rolled and came to rest on its left side. The open field was about 750 feet long (east to west) and 150 feet wide. The field was surrounded by about 30- to 40-foot-tall pine trees with larger growth on the west end. Performance charts from the helicopter's flight manual indicated that the helicopter should have had sufficient takeoff climb performance to clear the trees. Examination of the helicopter did not reveal any mechanical anomalies with the flight controls or engine that would have precluded normal operation. The pilot reported that the helicopter was operating normally before the accident.

Factual narrative

On August 29, 2013, at 1643 eastern daylight time, a Brandtly B2B helicopter, N2253U, registered to and operated by the pilot, was substantially damaged when it impacted the ground after takeoff from a private field near Rothbury, Michigan. The commercial pilot and passenger received minor injuries. The personal flight was conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed in the vicinity and no flight plan was filed. The pilot reported that he initiated takeoff in light and variable wind conditions from the middle of a private field. He hover taxied downwind to the east end of the field before commencing the takeoff to the west. During the takeoff, the pilot realized that the helicopter would not clear a tree line located at the edge of the field. He initiated a pedal turn to the left away from the trees to attempt to abort the takeoff. He stated that during the left pedal turn, a gust of wind forced the helicopter toward the ground. The helicopter impacted the ground hard near level attitude on an uphill slope. The main rotor blade struck the ground, the helicopter rolled, and came to rest on its left side. The open field was approximately 750 feet in length (east to west) and 150 feet wide. The field was surrounded by pines trees approximately 30 to 40 feet tall with larger growth on the west end. Performance charts from the helicopter's flight manual indicated that the helicopter should have had the takeoff climb performance to clear the trees during takeoff. Examination of the helicopter by an FAA inspector did not reveal any mechanical anomalies with the flight controls and engine. The pilot reported that the helicopter was operating normally prior to the accident.

Aircraft

Registration
N2253U
Reported as
Brantly B-2B
Category
Helicopter
Serial number
412
Airframe hours
1,572
Engine
Lycoming O&VO-360 SER, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Gregory S McCabe and Bruce L McCabe
Registered owner
Gregory S McCabe and Bruce L McCabe
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 10, 2013 · 46 hours before
Departed
Rothbury, MI
Destination
Rothbury, MI

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
30
Injuries
Minor
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
May 26, 2013
Seat
Right
Restraint
3-point
Flight hours
2,060 total · 31 in this make and model · 1,953 as pilot in command · 239 in the last 90 days · 85 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
88 °F

Docket · 7

The files NTSB released with the investigation on October 1, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 8.0 MB in all.

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 N2253U · 1

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