- Date
- April 8, 2010, 19:00 local (Apr 9, 2010, 00:00 UTC)
- Place
- Canton, TX
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N439MMQuicksilver Sport 2S
- Defining event
- Maneuvering: Flight control sys malf/fail
- Weather
- Visual (VMC) · Day
- Status
- Completed · report July 22, 2010
- Report
- Approved by Office Director
- NTSB office
- Central Region
- Parties
- Federal Aviation Administration
- FAA report
- 20100408031579A
- Case key
- 75729
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 airplane builder’s improper installation of the left rear wing strut eyebolt.
Findings · 1
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
While in a turn at low altitude, the pilot of the open cockpit experimental airplane heard a “loud pop,” followed by a change in the feel of the flight controls. The pilot elected to reduce the engine power to idle and activate the ballistic recovery system (BRS). Seconds later the airplane impacted into an area of trees and came to rest in the trees near the ground. The pilot was able to exit the airplane unassisted. An examination of the wreckage revealed that the left wing rear strut threaded eyebolt had pulled free from the threaded barrel of the wing strut. The thread-to-barrel engagement was measured at 5/32 of an inch with approximately 16 threads exposed. Per the manufacturer’s assembly manual, the eyebolt was to have a minimum of 5/8 of an inch thread-to-barrel engagement with approximately three-and-a-half threads exposed.
Factual narrative
While in a turn at low altitude, the pilot of the open cockpit experimental airplane heard a “loud pop,” followed by a change in the feel of the flight controls. The pilot elected to reduce the engine power to idle and activate the ballistic recovery system (BRS). Seconds later the airplane impacted into an area of trees and came to rest in the trees near the ground. The pilot was able to exit the airplane unassisted. An examination of the wreckage revealed that the left wing rear strut threaded eyebolt had pulled free from the threaded barrel of the wing strut. The thread-to-barrel engagement was measured at 5/32 of an inch with approximately 16 threads exposed. Per the manufacturer’s assembly manual, the eyebolt was to have a minimum of 5/8 of an inch thread-to-barrel engagement with approximately three-and-a-half threads exposed.
Aircraft
- Registration
- N439MM
- Reported as
- Quicksilver Sport 2S
- Category
- Airplane
- Serial number
- 0189
- Engine
- Rotax 582UL DCDI, 65 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Special, Experimental (Special)
- Departed
- 1TA7 · Canton, TX
- Destination
- Canton, TX
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
- 70
- Injuries
- None
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Sport pilot
- Seat
- Left
- Flight hours
- 281 total · 65 in this make and model · 7 in the last 90 days · 2 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- Calm
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 75 °F
Docket · 2
The files NTSB released with the investigation on June 25, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 7.8 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.