LAX97LA227

NTSB accident investigation · Burkhart Grob G-103-TWIN II · Jacumba, CA · June 30, 1997

Accident · Minor injuriesLimited investigationFinal report
Date
June 29, 1997, 17:10 local (Jun 30, 1997, 00:10 UTC)
Place
Jacumba, CA
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N18AGBurkhart Grob G-103-TWIN II
Weather
Visual (VMC) · Day
Status
Completed · report June 9, 1999
Report
Approved by Office Director
FAA report
19970629016179A
Case key
29823

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 abrupt rotation, which resulted in the breaking of the tow rope. A factor was the low altitude when the tow rope broke, precluding a landing on the runway.

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.

Abrupt maneuverTakeoff
Glider launch/tow equipment - failureCause
Rotation - abruptPilot in commandCause
Dragged wing,rotor,pod,float or tail/skidEmergency landing after takeoff
Terrain condition - rough/uneven
Altitude - inadequateFactor
Hard landingLanding - flare/touchdown
Landing gear - sheared

Analysis

The glider was being launched by a vehicle ground tow. About 250 feet agl, the tow row broke at the 'weak link.' The pilot reported that he might have been too aggressive during the rotation. He stated that he felt he was too far down the runway to land straight ahead, so he turned left intending to fly an abbreviated pattern. He stated that he lost altitude more rapidly than he had anticipated and could not complete the turn back to the runway. During the turn the glider descended and the left wing tip dragged through the vegetation. According to the pilot, the glider landed hard while skidding left and the main landing gear was sheared off.

Factual narrative

On June 29, 1997, at 1710 hours Pacific daylight time, a Burkhart Grob G-103-Twin II glider, N18AG, collided with terrain after aborting the takeoff climb when the tow rope broke at the Jacumba, California, airport. The glider was substantially damaged and the certificated commercial pilot received minor injuries. The passenger was not injured. The pilot was operating the glider as a personal flight when the accident occurred. Visual meteorological conditions prevailed at the time.

The pilot reported that the glider was being launched by a vehicle ground tow. He stated that about 250 feet agl, the tow row broke at the "weak link." He reported that he might have been too aggressive during the rotation. The pilot reported that he felt he was too far down the runway to land straight ahead, so he turned left, intending to fly an abbreviated pattern. He lost altitude more rapidly than he had anticipated and could not complete the turn back to the runway. During the turn the glider descended and the left wing tip dragged through vegetation. According to the pilot, the glider landed hard while skidding left and the main landing gear was sheared off.

Aircraft

Registration
N18AG
Reported as
Burkhart Grob G-103-TWIN II (G-103-TWIN)
Category
Glider
Serial number
3714
Engine
unknown
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Associated Glider Club Of Sc
Airworthiness certificate
Standard, Normal
Departed
L78
Airport
L78 · Jacumba, runway 25, 2,510 × 100 ft, gravel

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
Certificate
Commercial
Medical
Unknown
Seat
Front
Flight hours
668 total · 3 in this make and model · 41 in the last 90 days · 9 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
250° at 15 knots, gusting 20
Visibility
40 statute miles
Lowest ceiling
None
Temperature
97 °F, dew point 36 °F
Altimeter
29.00 inHg
Observed at
IPL, 35 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.