NYC07CA118

NTSB accident investigation · Burkhart Grob Flugzeugbau G103 · Franconia, NH · May 13, 2007

Accident · Minor injuriesData collectionFinal report
Date
May 13, 2007, 15:30 local (19:30 UTC)
Place
Franconia, NH
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N39783Burkhart Grob Flugzeugbau G103
Weather
Visual (VMC) · Day
Status
Completed · report June 27, 2007
Report
Approved by Office Director
Parties
FSDO/FAA
FAA report
20070513014879A
Case key
65796

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 pilot's failure to obtain the proper touchdown point. A factor in the accident was an encounter with an updraft while on approach.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with objectLanding
Object - tree(s)
Weather condition - updraftFactor
Proper touchdown point - not obtainedPilot in commandCause

Analysis

After about 2.5 hours of soaring in the Burkhart Grob Flugzeugbau G-103 glider, the pilot returned to the airport and entered the traffic pattern at 1,200 feet with a "small amount" of spoilers deployed. He turned onto the downwind leg at 800 feet, and used "more spoilers" to descend to 500 feet. He then turned onto the base leg, and at 300 feet and 60 knots airspeed, he turned onto the final leg of the approach and aligned the glider with the runway. He immediately felt the glider had entered rising air, so he performed a full slip with the spoilers deployed; however, the glider did not descend significantly. The pilot waited for the glider to exit the rising air mass, and it continued to descend moderately until about mid-field, when it descended rapidly. The glider touched down about 3/4 down the runway and bounced back into the air. Due to a pile of debris at the end of the runway, the pilot elected to close the spoilers, overfly the debris, and land the glider in the treetops ahead at a slow speed. Before he could accomplish his plan, a crosswind blew the glider towards a tree. The left wing contacted the tree, and the glider subsequently impacted the ground.

Factual narrative

According to the pilot, after about 2.5 hours of soaring in the Burkhart Grob Flugzeugbau G-103 glider, he returned to the airport and entered the traffic pattern at 1,200 feet with a "small amount" of spoilers deployed. He turned onto the downwind leg at 800 feet, and used "more spoilers" to descend to 500 feet. He then turned onto the base leg, and at 300 feet and 60 knots airspeed, he turned onto the final leg of the approach and aligned the glider with the runway. He immediately felt the glider had entered rising air, so he performed a full slip with the spoilers deployed; however, the glider did not descend significantly. Due to the proximity of the surrounding trees to the glider, the pilot felt that he could not successfully perform an s-turn or a 360-degree turn to lose energy, and instead felt that he should wait for the glider to exit the rising air mass. The glider continued to descend moderately until about mid-field, when it descended rapidly. The glider touched down about 3/4 down the runway and bounced back into the air. Due to a pile of debris at the end of the runway, the pilot elected to close the spoilers, overfly the debris, and land the glider in the treetops ahead at a slow speed. Before he could accomplish his plan, a crosswind blew the glider towards a tree. The left wing contacted the tree, and the glider subsequently impacted the ground.

Aircraft

Registration
N39783
Reported as
Burkhart Grob Flugzeugbau G103
Category
Glider
Serial number
3805
Airframe hours
3,070
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 1, 2006
Departed
1B5 · Franconia, NH
Destination
1B5
Airport
1B5 · Franconia Airport, runway 36, 2,305 × 150 ft, grass/turf

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
44
Injuries
Minor
Certificate
Private
Seat
Front
Flight hours
122 total · 9 in this make and model · 62 as pilot in command · 5 in the last 90 days · 5 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
340° at 10 knots, gusting 16
Temperature
55 °F, dew point 21 °F
Observed at
HIE, 14 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.