- 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.
On this page
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.
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.