WPR11CA486

NTSB accident investigation · Schleicher ASW-27 · Brigham City, UT · July 19, 2011

Accident · No injuriesData collectionFinal report
Date
July 19, 2011, 17:21 local (23:21 UTC)
Place
Brigham City, UT
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N797VSchleicher ASW-27
Defining event
Enroute: Loss of lift
Weather
Visual (VMC) · Day
Status
Completed · report March 8, 2012
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Salt Lake FSDO
Case key
82596

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 glider pilot did not take timely action to locate a safe outlanding area after entering an area where atmospheric lift was not sufficient to maintain soaring flight.

Findings · 4

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.

Terrain: rough terrainEnvironmental issues › Physical environment · Contributed to outcomeSchleicher ASW-27: 3 casesAll aircraft: 442 casesProbable cause
TerrainEnvironmental issues › Physical environment · Contributed to outcomeSchleicher ASW-27: 1 caseAll aircraft: 267 casesProbable cause
Environmental issuesEnvironmental issues › Conditions/weather/phenomena · Effect on operationSchleicher ASW-27: 2 casesAll aircraft: 57 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

While participating in a soaring contest, the glider pilot entered an area where atmospheric lift was not sufficient. Instead of reversing his course toward better outlanding fields, he continued with the contest course and task. He ultimately ended up in a location where he was forced to attempt an off-airport landing on unsuitable terrain. Immediately upon touchdown, the glider encountered several small boulders that were hidden in the grass, and the left wing tip became snagged in some tall grass, resulting in a loss of directional control. During the resulting ground loop, both wings sustained substantial damage and the empennage tail boom separated from the main part of the fuselage.

Factual narrative

While participating in a soaring contest, the glider pilot entered an area where atmospheric lift was not sufficient. Instead of jettisoning the glider's water ballast to reduce its sink rate and reversing his course toward better outlanding fields, he continued on with the contest course and task. He therefore ultimately ended up in a location where he was forced to attempt an off-airport landing on unsuitable terrain. Immediately upon touchdown, the glider encountered several small boulders that were hidden in the grass, and the left wing tip became snagged in some tall grass, resulting in a loss of directional control. During the resulting ground loop, both wings sustained substantial damage and the empennage tail boom separated from the main part of the fuselage.

Aircraft

Registration
N797V
Reported as
Schleicher ASW-27
Category
Glider
Serial number
27145
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Cumiford James H Jr
Registered owner
Cumiford James H Jr
Airworthiness certificate
Standard, Normal
Departed
KLGU · Logan, UT
Destination
KLGU · Logan, 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

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
56
Injuries
None
Certificate
Private
Seat
Single
Flight hours
3,018 total · 892 in this make and model

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F

Docket · 1

The files NTSB released with the investigation on January 17, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 709 KB in all.