Everyone says wake turbulence, but the following description sounds
more like a Vmc rollover, as unlikely as that would be just prior to
touchdown.
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NTSB Identification: ATL03FA115
14 CFR Part 91: General Aviation
Accident occurred Wednesday, July 02, 2003 in Memphis, TN
Aircraft: Beech 58P, registration: N36TL
Injuries: 2 Fatal, 2 Serious.

This is preliminary information, subject to change, and may contain
errors. Any errors in this report will be corrected when the final
report has been completed.

On July 2, 2003, at 1005 central daylight time, a Beech 58P, N36TL,
registered to private owners and operated by the pilot, rolled
inverted and collided with the ground during approach to landing at
the Memphis International Airport, Memphis, Tennessee. The personal
flight was operated under the provisions of Title 14 CFR Part 91 with
an instrument flight plan filed. Visual meteorological conditions
prevailed. The private pilot and the front-seated passenger received
fatal injuries, the two rear-seated passengers received serious
injuries, and the airplane sustained substantial damage. The flight
departed Peter O. Knight Airport, Tampa, Florida, about 0815 eastern
daylight time on July 2, 2003.

The flight was cleared for the ILS approach to runway 36R at Memphis
International Airport, Memphis, Tennessee. The pilot acknowledged the
clearance to air traffic controllers, and no further radio
communications were received from the pilot. A review of radar data
revealed the flight intercepted the localizer for 36R and descended
for the approach. The radar data also revealed runway 36R and 36C were
active landing runways with arrivals prior to the arrival of the
accident airplane. The pilot-rated witness in an airplane taxiing
southbound between runways 36R and 36C observed the accident airplane
on final approach. The witness stated the airplane descended to
approximately 10 to 15 feet above the runway, and it appeared to begin
to drift to the left of the runway. The witness stated the airplane
then appeared to slowly yaw and roll to the left, followed by an
upward pitch, and then a sudden "snap roll" to the left. Another
witness in an observation tower west of the runway reported the
airplane appeared to be positioned off the left side of the runway
during the approach, and it appeared to nose straight down toward the
ground while turning to the left. Both witnesses stated they did not
see any other airplanes on the ground near the approach areas of the
runways.

Examination of the accident site revealed the airplane was found
inverted in a grassy area between runways 36C and 36R, north of the S1
taxiway. Wreckage debris was scattered on an approximate 310-degree
magnetic heading along a path 187 feet long and 57 feet wide. The
debris path originated on the S1 taxiway west of runway 36R in an area
where paint smears, debris, and two series of propeller slash marks
were observed on the concrete. The propeller blades of both engines
displayed chordwise scoring and torsional twisting. The ailerons, wing
flaps, elevator, elevator trim tab, and rudder were attached to the
airframe. The landing gear was in the down and locked position.
Approximately 40 to 50 gallons of fuel was recovered from the fuel
tanks.