the failure of the AT-401 pilot to maintain clearance with the AT-402 airplane during landing. Contributing factors were the unreliable communication radio in the AT-401, the AT-401 pilot's continued flight with known communication radio problems, and the glare of the sun.

IMPROPER WEATHER EVALUATION BY THE PILOT IN COMMAND WHILE ATTEMPTING TO TAKEOFF WITH A QUARTERING TAILWIND ASSOCIATED WITH A NEARBY THUNDERSTORM AND FAILURE OF THE PILOT TO MAINTAIN DIRECTIONAL CONTROL.