CHI93DEE03

NTSB accident investigation · Maxair MU532 · Fox Lake, IL · July 12, 1993

Accident · Serious injuriesFinal report
Date
July 11, 1993, 19:55 local (Jul 12, 1993, 00:55 UTC)
Place
Fox Lake, IL
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
NONEMaxair MU532
Weather
Visual (VMC) · Day
Status
Completed · report September 13, 1994
Report
Approved by Office Director
Case key
9138

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 failure of the pilot to maintain the necessary altitude above the terrain.

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.

In flight collision with terrain/waterManeuvering
Altitude - inadequatePilot in commandCause
Clearance - not maintainedPilot in command
Terrain condition - water

Analysis

The pilot reported to the sheriff that while maneuvering over a lake at approximately 50 feet above the water, a gust of wind forced the nose of the airplane downward and it impacted the water. The pilot did not hold FAA pilot or medical certificates, and the airplane did not have FAA registration or airworthiness certificates. According to the FAA inspector who inspected the wreckage, the construction of the airplane did not comply with FAA requirements.

Factual narrative

On July 11, 1993, about 1955 central daylight time, a two-place Maxair Drifter MU532 airplane, owned and piloted by John R. Diebel descended to a water impact while maneuvering over Pistakee Lake, near Fox Lake, Illinois. The sole occupant was seriously injured, and the airplane received substantial damage. Visual meteorological conditions existed for the personal flight operated under 14 CFR Part 91. The flight originated from an unknown location. No flight plan was filed.

The operator did not hold FAA pilot or medical certificates. The construction of the Maxair Drifter did not comply with the requirements of FAR Part 103. The airplane did not have FAA registration or airworthiness certificates. The operator did not hold or operate the Maxair Drifter in accordance with the conditions of an exemption.

On July 21, 1993, an NTSB Form 6120.1/2 was forwarded to Mr. Diebel for completion and submission. This form has not been returned.

The wreckage was towed to a nearby marina. To facilitate towing and storage, the wings, landing gear, and fuel containers were disassembled. Personnel from the marina ran the engine to purge it of any water. Investigation of the airplane revealed the following:

The longitudinal support attaching the empennage was severed into two pieces, the propeller blades of the pusher-mounted engine were severed almost to the hub. The cockpit area and remaining structures were intact and relatively undamaged. Except for some of the hardware, none of the seatbelts, instruments, or other components were of aircraft quality or had any TSO markings. The assembly techniques were not in accordance with acceptable FAA maintenance practices. Approximately nine gallons of automotive fuel was contained in two interconnected plastic five-gallon containers strapped onto individual racks and located behind the aft seat. The permanent fuel line fitting that connected the containers was broken.

Aircraft

Registration
NONE
Reported as
Maxair MU532
Category
Airplane, amateur-built
Engine
Rotax BOMBADIER 582, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
John R. Diebel
Registered owner
John R. Diebel
Departed
Unknown
Destination
NONE · IL

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
30
Medical
Unknown, Unknown
Seat
Front

Weather

Conditions
Visual (VMC) · Day
Wind
300° at 8 knots
Visibility
35 statute miles
Lowest ceiling
None
Altimeter
29.00 inHg
Observed at
UGN, 15 nm away