The 5-AT-D introduced use of PW Wasp SC radials of 450 horsepower each and the wings were slightly elevated while overall weight was increased. Twenty of this kid were completed. The 5-AT-DS was another floatplane model and one was built. The 5-AT-E was a revised, proposed, variant which would have seated the wing engines at the leading edges in more conventional fashion.
The 6-AT-A was the 5-AT-A with Wright J-6-9 radial engines of 300 horsepower each. Three were built. The 6-AT-AS was the floatplane model ad only one of this form was completed.
The 7-AT-A was the 6-AT-A with a PW Wasp radial of 420 horsepower installed at the nose. The 8-AT was a one-off model based in the 5-AT-C and fitting just a single engine (in the nose) and mainly used for cargo-hauling. The 9-AT was the 4-AT-B with 3 x PW Wasp radials of 300 horsepower each. The 11-AT was the 4-AT-E with 3 x Packard DR-980 diesel units of 225 horsepower each. The 13-A was the 5-AT-D with a mixed engine arrangement encompassing 1 x Wright Cyclone radial of 575 horsepower in the nose and 2 x Wright J-6-9 Whirlwind engines of 300 horsepower at the wings. The 14-A carried 3 x Hispano-Suiza 18 Sbr engines of 1,000 horsepower each, was a dimensionally larger variant and could carry up to forty passengers.
Civilian operators included Colombia, Canada, Cuba, Czechoslovakia, the Dominican Republic, Mexico, the United States and Venezuela.
Various models were converted to military forms and fielded under various designations. The C-3A was a transport based in the 4-AT-E and the C-4 was the 4-AT-B. The 5-AT-D made up the C-4A and a re-engined version became the C-4B. The USN/USMC knew the Trimotor as the "JR" and included the JR-2 and JR-3 as well as various "RR" forms.
Military operators included Australia, Canada, Colombia, Spain, the United Kingdom and the United States.
Just eighteen Ford Trimotors are known today (2017) with some being airworthy and others having ended up as protected museum showpieces.
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