WPR14CA352

NTSB accident investigation · Rans S 6S · Rigby, ID · August 22, 2014

Accident · Minor injuriesData collectionFinal report
Date
August 22, 2014, 11:30 local (17:30 UTC)
Place
Rigby, ID
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N171CTRans S 6S
Defining event
Takeoff: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report November 13, 2014
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
FAA
FAA report
20140822015979A
Case key
89933

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

The student pilot's loss of directional control during takeoff in gusting wind conditions. Contributing to the accident was the flight instructor's failure to intervene and apply corrective flight control inputs.

Findings · 5

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 · Student/instructed pilotRans S-6S: 1 caseAll aircraft: 9,295 casesProbable cause
Action: lack of actionPersonnel issues › Action/decision · Instructor/check pilotRans S-6S: 1 caseAll aircraft: 792 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationRans S-6S: 1 caseAll aircraft: 1,199 cases
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedRans S-6S: 1 caseAll aircraft: 3,958 casesProbable cause
Object/animal/substance: residence/buildingEnvironmental issues › Physical environment · Contributed to outcomeRans S-6S: 1 caseAll aircraft: 58 cases

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 light sport flight instructor was providing flight instruction to the owner of the experimental, amateur-built, tailwheel-equipped light sport airplane. The airplane was equipped with side-by-side seating; the owner sat in the left seat and was the flying pilot, and the instructor sat in the right seat. They departed the home, non-towered airport and flew uneventfully to an airport with an operating air traffic control tower, where they practiced landings and takeoffs. They then returned to the home airport for additional landings and takeoffs. All portions of the flight through that point were uneventful. After returning to, and making at least one landing back at the home airport, the pilot was attempting a takeoff from runway 19. Either at or shortly after liftoff, the airplane was struck by an "unexpected wind gust," which resulted in a loss of directional control. The student pilot was unable to regain control, and the flight instructor did not physically intervene, before the airplane struck a hangar located about 270 feet from the runway centerline. The right wing sustained substantial damage when it struck the hangar. The airplane then passed between that hangar and an adjacent one. The flight instructor did not offer any explanation as to why he did not intervene. The measured wind at an airport located about 10 miles southwest of the accident airport was reported as 320 degrees at 8 knots about 37 minutes prior to the accident, and as 090 degrees at 3 knots about 23 minutes after the accident. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

The light sport flight instructor was providing flight instruction to the owner of the experimental, amateur-built, tailwheel-equipped light sport airplane. The airplane was equipped with side-by-side seating; the owner sat in the left seat and was the flying pilot, and the instructor sat in the right seat. They departed the home, non-towered airport and flew uneventfully to an airport with an operating air traffic control tower, where they practiced landings and takeoffs. They then returned to the home airport for additional landings and takeoffs. All portions of the flight through that point were uneventful. After returning to, and making at least one landing back at the home airport, the pilot was attempting a takeoff from runway 19. Either at or shortly after liftoff, the airplane was struck by an "unexpected wind gust," which resulted in a loss of directional control. The student pilot was unable to regain control, and the flight instructor did not physically intervene, before the airplane struck a hangar located about 270 feet from the runway centerline. The right wing sustained substantial damage when it struck the hangar. The airplane then passed between that hangar and an adjacent one. The flight instructor did not offer any explanation as to why he did not intervene. The measured wind at an airport located about 10 miles southwest of the accident airport was reported as 320 degrees at 8 knots about 37 minutes prior to the accident, and as 090 degrees at 3 knots about 23 minutes after the accident. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N171CT
Reported as
Rans S 6S (SUPERSIX)
Category
Airplane
Serial number
11021467
Built
2005
Airframe hours
468
Engine
Rotax 912S, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Airworthiness certificate
Special, Experimental light sport (Special)
Last inspection
Annual · May 10, 2014
Departed
KIDA · Idaho Falls, ID
Destination
U56 · Rigby, ID
Airport
U56 · Rigby, runway 19, 3,500 × 50 ft, asphalt

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Flight instructor
Age
58
Injuries
None
Certificates
Flight instructor, Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
May 1, 2013
Seat
Right
Restraint
3-point
Flight hours
1,587 total · 87 in this make and model · 1,400 as pilot in command · 57 in the last 90 days · 22 in the last 30 days
Role
Student pilot
Age
66
Injuries
None
Certificate
Student
Medical
Sport pilot
Seat
Left
Restraint
3-point
Flight hours
21 total · 21 in this make and model · 5 as pilot in command · 13 in the last 90 days · 6 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
320° at 8 knots
Visibility
10 statute miles
Lowest ceiling
10,000 ft overcast
Temperature
57 °F, dew point 54 °F
Altimeter
30.07 inHg
Turbulence
Unknown
Observed at
KIDA, 10 nm away

Docket · 6

The files NTSB released with the investigation on October 28, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 10.2 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.