Ok.. Problem solved!!

When I had the SLEW turned on and then hit the "A" key to lower it to ground level, I noticed that the plane would "sink" through the ground up to the bottom of the fuselage. When I turned SLEW off, then the plane would "pop" up to normal sitting position on the runway.
So then I decided to look in the .CFG for a solution. The aircraft was not set to the correct [glow=yellow,2,300]static_cg_height[/glow]. It was too low. So after adjusting this parameter, the airplane does not sink into the ground when it is first loaded or being loward in SLEW mode.
I think this problem is fixed. Thanks all!
Scott