WPR11CA387

NTSB accident investigation · P&M GT450 · Teton Village, WY · August 17, 2011

Accident · Serious injuriesData collectionFinal report
Date
August 16, 2011, 18:40 local (Aug 17, 2011, 00:40 UTC)
Place
Teton Village, WY
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N988AZP&M GT450
Defining event
Maneuvering-low-alt flying: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report October 17, 2011
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration FSDO
FAA report
20110816022029A
Case key
81519

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 an adequate airspeed, which resulted in a stall mush to ground impact.

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: mountainous/hilly terrainEnvironmental issues › Physical environment · Decision related to conditionP&M QUIK GT450 912S: 1 caseAll aircraft: 329 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedP&M QUIK GT450 912S: 1 caseAll aircraft: 1,681 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotP&M QUIK GT450 912S: 2 casesAll aircraft: 9,295 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

The pilot reported departing the airport in the light-sport weight-shift-control airplane, and flying southbound along the western slopes of the Teton Mountain Range. The airplane climbed to an altitude of about 8,000 feet mean sea level, and the pilot changed course, approaching a canyon area to the east. As he approached rising terrain the airplane's rate of climb began to diminish. He elected to continue flight towards a plateau, due to ridges which were now encroaching from his left and right. He attempted to increase the airplane's rate of climb, and the airspeed subsequently began to decrease. He reported that as the airplane approached stall speed, he encountered a gust of wind and the airplane stalled. He lowered the airplane's nose, and was able recover control about 20 feet above ground level. He attempted to land ahead on the plateau; however, during the landing roll, the nose landing gear collapsed, and the airplane rolled onto the right wing, substantially damaging both wings. The accident site was located in a remote area at the 9,800-foot-level on the western slope of the mountain range. The pilot utilized a SPOT Global Positioning System (GPS) emergency locator to summon assistance from search and rescue personnel, who located him about 2 hours after the accident. The pilot reported no preimpact mechanical malfunctions or failures with the airframe or engine that would have precluded normal operation.

Factual narrative

The pilot reported departing the airport in the light-sport weight-shift-control airplane, and flying southbound along the western slopes of the Teton Mountain Range. The airplane climbed to an altitude of about 8,000 feet mean sea level, and the pilot changed course, approaching a canyon area to the east. As he approached rising terrain the airplane's rate of climb began to reduce. He elected to continue flight towards a plateau, due to ridges which were now encroaching from his left and right. He attempted to increase the airplane's rate of climb, and the airspeed subsequently began to decrease. He reported that as the airplane approached stall speed, he encountered a gust of wind and the airplane stalled. He lowered the airplane's nose, and was able recover control about 20 feet above ground level. He attempted to land ahead on the plateau, however during the landing roll, the nose landing gear collapsed, and the airplane rolled onto the right wing. The pilot sustained serious injuries during the accident sequence, and the airplane sustained substantial damage to both wings. The accident site was located in a remote area at the 9,800-foot-level on the western slope of the mountain range. The pilot utilized a SPOT Global Positioning System (GPS) emergency locator to summon assistance from search and rescue personnel, who located him about 2 hours after the accident. The pilot reported no preimpact mechanical malfunctions or failures with the airframe or engine that would have precluded normal operation.

Aircraft

Registration
N988AZ
Reported as
P&M GT450
Category
Airplane
Serial number
8270
Airframe hours
142
Engine
Rotax 912ULS, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Special light-sport (Special)
Last inspection
Annual · May 11, 2011 · 142 hours before
Departed
KDIJ · Driggs, ID
Destination
KDIJ · Driggs, ID
Airport
KDIJ · Driggs

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
57
Injuries
Serious
Certificate
Sport Pilot
Airplane ratings
Single-engine land
Medical
Sport pilot
Seat
Front
Flight hours
236 total · 130 in this make and model · 134 as pilot in command · 28 in the last 90 days · 4 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
280° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 27 °F
Altimeter
30.22 inHg
Observed at
KDIH, 12 nm away

Docket · 3

The files NTSB released with the investigation on September 8, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.9 MB in all.

FAA reports on this event · 1

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