SEA05LA164

NTSB accident investigation · Burkhart Grob G103 Twin Astir · Driggs, ID · August 4, 2005

Accident · FatalLimited investigationFinal report
Date
August 4, 2005, 15:15 local (21:15 UTC)
Place
Driggs, ID
Injuries
1 fatal
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N153SSBurkhart Grob G103 Twin Astir
Weather
Visual (VMC) · Day
Status
Completed · report March 28, 2006
Report
Approved by Office Director
Parties
FAA/FSDO
FAA report
20050804017299A
Case key
62178

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 maintain aircraft control while maneuvering in the traffic pattern for landing. The pilot's failure to maintain a proper altitude was a factor.

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.

Loss of control - in flightManeuvering
Aircraft control - not maintainedPilot in commandCause
Altitude - lowPilot in commandFactor
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - open field

Analysis

The glider's tow plane pilot reported that during the pre-tow briefing, the glider pilot stated that he wanted to do three pattern tows and one high tow. The pilot then pulled the glider around to position for the takeoff tow. The tow plane pilot stated that shortly after 1500, he started the takeoff without any problems. The pilot flew a circling turn to the right and went to mid-field and made another right turn crossing the runway, and climbing to 1,200 feet above ground level (agl) for the release. The tow pilot then circled to land on runway 21. The tow pilot stated that as he was taxiing back he noticed the glider, no higher than 75 feet agl, pitch nose down. The tow pilot stated that the glider was too low and just before it hit the ground, it looked like the nose was starting to come up. The glider collided with the ground short of runway 21 in about a 45 degree nose down attitude. Post accident inspection of the wreckage did not disclose evidence of a mechanical failure or malfunction.

Factual narrative

On August 4, 2005, about 1515 mountain daylight time, a Burkhart Grob G103 Twin Astir glider, N153SS, registered to and operated by the pilot as a 14 CFR Part 91 personal flight, collided with the terrain at the northeast end of the Reed Memorial Airport, Driggs, Idaho. Visual meteorological conditions prevailed at the time and no flight plan was filed for the local flight. The glider was substantially damaged and the private pilot, the sole occupant, was fatally injured.

The glider's tow plane pilot reported that during the pre-tow briefing, the glider pilot stated that he wanted to do three pattern tows and one high tow. The pilot then pulled the glider around to position for the takeoff tow. The tow plane pilot stated that shortly after 1500, he started the takeoff without any problems. The pilot flew a circling turn to the right and went to mid-field and made another right turn crossing the runway, and climbing to 1,200 feet above ground level (agl) for the release. The tow pilot then circled to land on runway 21. The tow pilot stated that as he was taxiing back he noticed the glider, no higher than 75 feet agl, pitch nose down. The tow pilot stated that the glider was too low and just before it hit the ground, it looked like the nose was starting to come up. The glider collided with the ground short of runway 21 in about a 45 degree nose down attitude.

A Federal Aviation Administration Inspector from the Salt Lake City, Utah, Flight Standards District Office responded to the accident site. The inspector stated that the initial ground impact was identified by an impact crater. Following a path to the north northwest, debris fragments were located along the surface to include the tail surfaces and interior items. The main wreckage to include the wings and fuselage was located approximately 195 feet from the initial impact crater. The fuselage came to rest inverted about 600-800 feet from the end of the runway. All flight control surfaces were accounted for.

Flight and maintenance records provided to the FAA by a member of the glider club indicated that the pilot had accumulated a total flight time in all aircraft of about 144 hours. The logbook provided indicated flight time starting in the glider involved in the accident was in July 2002. About 24 hours had been accumulated since this time. The pilot held a private pilot certificate in glider operations only.

An annual inspection of the glider was accomplished on April 1, 2005. About 16 hours had been accumulated since the inspection.

Aircraft

Registration
N153SS
Reported as
Burkhart Grob G103 Twin Astir
Category
Glider
Serial number
3094
Airframe hours
587
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
James G. Davis
Airworthiness certificate
Standard, Normal
Last inspection
Annual · April 1, 2005 · 16 hours before
Departed
Driggs, ID
Destination
U59
Airport
U59 · Reed Memorial, runway 21, 7,300 × 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
Pilot
Age
48
Injuries
Fatal
Certificate
Private
Last flight review
October 1, 2003
Seat
Front
Toxicology
Performed
Flight hours
144 total · 23 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
320° at 4 knots
Visibility
8 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 37 °F
Altimeter
30.37 inHg
Observed at
JAC, 18 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.

Other investigations on N153SS · 1

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