2 fatal · Upton Bakeng Duce · 2009-05-09 · Ramona, CA, USA
Event
NTSB number
WPR09FA234
Event ID
20090509X02427
Type
Accident
Date
2009-05-09
Location
Ramona, CA, USA
Coordinates
32.988609, -116.781944
Injuries
Highest injury
FATL
Fatal
2
Serious
0
Minor
0
Uninjured
0
Total aboard
2
Aircraft
Make
Upton
Model
Bakeng Duce
Registration
N86YP
FAR Part
091
Engines
1
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
An in-flight separation of the right wing, which resulted from the pilot's performance of a maneuver that produced aerodynamic loads that exceeded the wing spar’s degraded strength. The wing spar strength degradation was due to the builder's failure to comply with Federal Aviation Administration recommended guidelines to select and incorporate wood in the spar with a grain pattern aligned with the longitudinal axis of the spar.