The landing gear was strengthened , the maximum takeoff weight was increased from 45,000 to 56,000 lb ( 20,400 to 25,400 kg ) ) , and the exterior painted military olive drab .
The landing gear was made stronger and the maximum take-off weight was made bigger ( from 45,000 to 56,000 lb ( 20,400 to 25,400 kg ) ) .