WPR12CA134

NTSB accident investigation · Burkhart Grob G-103A Twin II Acro · Dillingham, HI · February 20, 2012

Accident · No injuriesData collectionFinal report
Date
February 20, 2012, 08:05 local (18:05 UTC)
Place
Dillingham, HI
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N103SHBurkhart Grob G-103A Twin II Acro
Defining event
Landing-flare/touchdown: Hard landing
Weather
Visual (VMC) · Day
Status
Completed · report May 15, 2012
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Honolulu FSDO
FAA report
20120220003339A
Case key
83128

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 inadequate recovery from a bounced landing.

Findings · 2

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: landing flareAircraft › Aircraft oper/perf/capability · Incorrect use/operationBurkhart Grob G-103A TWIN II ACRO: 3 casesAll aircraft: 1,285 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · Student/instructed pilotBurkhart Grob G-103A TWIN II ACRO: 3 casesAll aircraft: 9,295 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

During the landing sequence, the student pilot pushed the control stick of the glider forward just before touchdown. This action resulted in the glider landing hard and bouncing about one foot back into the air. The student pilot then forced the glider onto the runway a second time, after which it bounced about five feet back into the air. In trying to recover from the second bounce, the student pilot forced the glider onto the runway a third time. When the glider again bounced back into the air, it pitched up to a degree such that the aft end of the fuselage contacted the asphalt runway. The student pilot then leveled the glider and allowed it to descend to the runway surface in a near level attitude. Both the composite tail boom and the composite vertical fin were cracked.

Factual narrative

During the landing sequence, the student pilot pushed the control stick of the glider forward just before touchdown. This action resulted in the glider landing hard and bouncing about one foot back into the air. The student pilot then forced the glider onto the runway a second time, after which it bounced about five feet back into the air. In trying to recover from the second bounce, the student pilot forced the glider onto the runway a third time. When the glider again bounced back into the air, it pitched up to a degree that resulted in the aft end of the fuselage coming in contact with the asphalt runway. The student pilot then leveled the glider off and allowed it to descend to the runway surface in a near level attitude. It was later determined that both the composite tail boom and the composite vertical fin were cracked.

Aircraft

Registration
N103SH
Reported as
Burkhart Grob G-103A Twin II Acro
Category
Glider
Serial number
34051-K-281
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Hana Hou Air LLC, doing business as Hawaii Glider School
Registered owner
Hana Hou Air LLC
Airworthiness certificate
Standard, Normal
Departed
PHDH · Dillingham, HI
Destination
PHDH · Dillingham, HI
Airport
PHDH · Dillingham Airport, runway 08, 9,007 × 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
21
Injuries
None
Certificate
Student
Seat
Front
Flight hours
27 total · 10 in this make and model · 10 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F

Docket · 1

The files NTSB released with the investigation on April 13, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 624 KB 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.