LAX83FU009

NTSB accident investigation · American Aerolights Eagle XL · Sommerton, AZ · June 26, 1983

Accident · FatalFinal report
Date
June 26, 1983, 09:59 local (16:59 UTC)
Place
Sommerton, AZ
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
UNREGAmerican Aerolights Eagle XL
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Case key
23529

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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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Airframe/component/system failure/malfunctionManeuvering
Maneuver - initiatedPilot in command
Wing,bracing wire - overloadFactor
Design stress limits of aircraft - exceededPilot in commandCause
In flight collision with terrain/waterDescent
Level off - delayedPilot in commandCause
Physical impairment(visual deficiency)Pilot in commandFactor

Analysis

A witness in another ultralight saw the plt of the eagle xl climb to about 800 to 1000 ft AGL after taking off. The witness was aprx 500 ft AGL when he saw the eagle xl start a steep descent from his 8 to 9 o'clock high position and thought the eagle xl plt was descending to meet him. He looked away to scan for other traffic and when he looked back he saw the eagle xl just before it impacted the ground in a near verticle dive. He noticed that before impact the left wing appeared to be swept back aprx 15 to 20 deg more than the right wing. Exam of the wreckage revealed that the left front flying wire was found separated at the bowsprit attachpoint. The pilot had previously failed a flight physical due to his failure to pass two depth perception tests. Reportedly, the plt had previously made rapid descents and had said he enjoyed doing these maneuvers.

Aircraft

Registration
UNREG
Reported as
American Aerolights Eagle XL
Category
Ultralight
Engine
Cuyuna 430R, 30 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 103
Registered owner
Bill Kerr

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
23
Airplane ratings
Single-engine land
Medical
Unknown, Unknown
Seat
Center
Flight hours
83 total · 8 in this make and model · 83 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 6 knots
Visibility
15 statute miles
Lowest ceiling
None
Temperature
93 °F, dew point 46 °F
Altimeter
29.00 inHg
Observed at
YUM, 5 nm away