WPR10LA294

NTSB accident investigation · Schleicher Alexander ASH 26 E · Parowan, UT · June 15, 2010

Accident · No injuriesLimited investigationFinal report
Date
June 15, 2010, 15:33 local (21:33 UTC)
Place
Parowan, UT
Injuries
2 uninjured
Phase of flight
Maneuvering
Aircraft
N455SSchleicher Alexander ASH 26 EN514TWSchempp-Hirth Ventus 2CT
Defining events
Maneuvering: Midair collisionManeuvering: Midair collision
Weather
Visual (VMC) · Day
Status
Completed · report October 21, 2010
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Salt Lake FSDO
Case key
76332

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot's failure to see and avoid the other glider climbing in the same thermal.

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.

N455S · Schleicher Alexander ASH 26 E

N514TW · Schempp-Hirth Ventus 2CT

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.

N455S · Schleicher Alexander ASH 26 E

N514TW · Schempp-Hirth Ventus 2CT

Analysis

Two glider pilots had entered the same thermal while participating in a competition task that required them to fly to a point about 90 miles from their point of departure and then to return. Both pilots where flying back to the point of departure after reaching the turnaround point when they entered the thermal. During their first full turn in the thermal, the left wing of one of the gliders and the nose of other glider came in contact. The impact resulted in the separation of the outboard three feet of the wing of one glider and the denting of the lower nose area of the other. The pilots of both gliders were able to return to the point of departure, where they both completed uneventful landings. Neither pilot had seen the other glider as he entered the thermal.

Factual narrative

On June 15, 2010, at 1533 mountain daylight time, a Schleicher Alexander GMBD ASH 26E glider, N455S, and a Schempp-Hirth Ventus 2CT glider, N514TW, were involved in a mid-air collision about 75 miles northeast of Parowan, Utah. Neither pilot was injured. Both pilots were the sole occupants of their respective gliders. The ASH 26E sustained substantial damage, and the Ventus 2CT sustained minor damage. Both pilots were operating under the provisions of 14 Code of Federal Regulations Part 91 in visual meteorological conditions. Both gliders departed Parowan, Utah (N455S at 1403, and N514TW at 1344), and Parowan was the planned final destination for both pilots. No flight plan had been filed. According to both pilots, they were competing in a glider competition task that required them to depart a point near Parowan, fly to a point about 90 miles northeast of Parowan, and then to return to Parowan for landing. Both pilots where flying back to Parowan after reaching the turnaround point when they entered the same thermal and began to climb. During their first full turn in the thermal, the left wing of the ASH 26E and the nose of the Ventus 2CT came in contact. The impact resulted in the separation of the outboard three feet of the wing of the ASH 26E, and denting of the lower nose area of the Ventus 2CT. The pilots of both gliders were able to return to Parowan, where they both completed uneventful landings. Both pilot's stated that they had not seen the other glider as they entered the thermal, and both pilot's stated that they realized that it was their responsibility to see and avoid any other gliders that were climbing in the same thermal.

Aircraft · 2

Registration
N455S
Reported as
Schleicher Alexander ASH 26 E
Category
Glider
Serial number
26183
Airframe hours
1,209
Engine
Midwest Engines AE50RAB, 50 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Salkeld Edwin M Jr Trustee
Registered owner
Salkeld Edwin M Jr Trustee
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 3, 2010
Departed
1L9 · Parowan, UT
Destination
1L9 · Parowan, UT

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.

Registration
N514TW
Reported as
Schempp-Hirth Ventus 2CT
Category
Glider
Serial number
191
Airframe hours
694
Engine
Solo 2350, 26 horsepower, reciprocating
Damage
Minor damage
Flight
Personal · Part 91
Operator
Welles Gillett Tim
Registered owner
Welles Gillett Tim
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · March 15, 2010
Departed
1L9 · Parowan, UT
Destination
1L9 · Parowan, UT

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot, aircraft N455S
Age
74
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
March 25, 2009
Seat
Front
Flight hours
4,208 total · 1,208 in this make and model · 42 in the last 90 days
Role
Pilot, aircraft N514TW
Age
71
Injuries
None
Certificates
Flight instructor, Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Without waivers/limitations
Last flight review
July 24, 2008
Seat
Front
Flight hours
7,279 total · 680 in this make and model · 7,250 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 13 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
81 °F

Docket · 2

The files NTSB released with the investigation on July 23, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.3 MB in all.

FAA reports on this event · 2

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