WPR12CA412

NTSB accident investigation · Grob-Werke G 120A · Mobile, AZ · September 10, 2012

Accident · No injuriesData collectionFinal report
Date
September 10, 2012, 09:10 local (16:10 UTC)
Place
Mobile, AZ
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N863AFGrob-Werke G 120A
Defining event
Takeoff-rejected takeoff: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report December 5, 2012
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20120910021589A
Case key
84991

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 failure to maintain directional control of the airplane during the takeoff roll and the subsequent aborted takeoff in a gusting crosswind.

Findings · 4

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.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedGrob-Werke G 120A: 1 caseAll aircraft: 3,958 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · Student/instructed pilotGrob-Werke G 120A: 2 casesAll aircraft: 9,295 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationGrob-Werke G 120A: 1 caseAll aircraft: 1,199 casesProbable cause
Wind: crosswindEnvironmental issues › Conditions/weather/phenomena · Effect on operationGrob-Werke G 120A: 1 caseAll aircraft: 1,008 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 student pilot, who had just completed a full-stop landing and taxied back to the approach end of the runway, started the takeoff roll with a right quartering headwind of about 8 knots. Just as he prepared to takeoff, a wind gust lifted the right wing and the airplane yawed to the left. Although the student applied right aileron and rudder to correct for the gust, the airplane continued toward the left edge of the runway. The student decided to abort the takeoff, reduce the power to idle, and apply the brakes. However, the airplane departed the left side of the runway and collided with a bush, resulting in substantial damage to the left wing. According to the pilot and the operator, there was no indication of any preimpact mechanical malfunction or failure of the airplane.

Factual narrative

The student pilot, who had just completed a full-stop landing and taxied back to the approach end of the runway, started his takeoff roll in a wind of about eight knots, which was coming from about 45 degrees to the right of the nose of the airplane. Just prior to the pilot initiating the rotation, the airplane encountered a wind gust from the right, which resulted in the right wing raising and the airplane yawing to the left. Although the pilot attempted to correct for the gust by applying right aileron and right rudder, the airplane continued toward the left edge of the 75-foot wide runway. The pilot, who therefore decided to abort the takeoff, reduced the power to idle and applied the brakes. During his attempt to bring the airplane to a stop, the airplane departed the left side of the runway, whereupon it collided with a large bush, resulting in substantial damage to the left wing. According to the pilot and the operator, there was no indication of any mechanical malfunction associated with the accident sequence.

Aircraft

Registration
N863AF
Reported as
Grob-Werke G 120A
Category
Airplane
Serial number
85003
Engine
Lycoming AEIO-540-D4D5, 260 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
International Pilot School
Registered owner
Airline Training Center Arizona Inc
Airworthiness certificate
Standard, Aerobatic
Departed
KGYR · Mobile, AZ
Destination
KGYR · Mobile, AZ
Airport
1AZO · Mobile, runway 09, 4,500 × 75 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

As NTSB recorded them. NTSB leaves out names.

Role
Student pilot
Age
23
Injuries
None
Certificate
Student
Medical
Class 3, With waivers/limitations
Seat
Left
Flight hours
53 total · 52 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
135° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None

Docket · 1

The files NTSB released with the investigation on October 5, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.7 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.