The tank installer computed weight and balance for the ferry flight, which included a maximum gross takeoff weight
of 3315 pounds, 30 percent greater than the 2550-pound weight for which an unmodified airplane is certificated.
where GW is the airplane's maximum gross takeoff weight
, and OW is the operating weight.
In early October, the TSA proposed a new set of security regulations targeting privately operated (i.e., Part 91) large airplanes, those with a maximum gross takeoff weight
greater than 12,500 pounds.
The STC (supplemental type certificate) allows operation at a maximum gross takeoff weight
of 3550 pounds, an increase of around 7.5 percent from the airplane's original 3300-pound gross weight when it left the factory.
Investigators performed weight and balance calculations revealing the airplane weighed 2604 pounds at takeoff, 147 pounds above the maximum gross takeoff weight
(MGTOW) of 2457 pounds.
The pilot further stated that his weight and balance calculations revealed that the airplane was 50 pounds below its maximum gross takeoff weight