Ford 5-AT Tri-Motor - overview version[/heading]
5-AT-a - three machines, třináctimístný transport aircraft derived from the 4-AT-B with the enlarged margin and the engines of Pratt & Whitney Wasp
5-AT-B - 15 passengers, increased takeoff weight, 42 machinery
5-AT-C - 17 passengers, increased takeoff weight, 47 machinery
5-AT-CS - three machines adjusted on the float
5-AT-D - "Club" - a variant with more luxurious amenities, 20 machines
5-AT-DS - one machine modified to float
5-AT-E - prototype, 5-AT-C with the engines moved to the wings
C-4 - 5-AT-B purchased by the USAAC, the engines of the R-1340-3
C-4A - four 5-AT-D built for the USAAC, the engines of the R-1340-11
C-4B - one C-4A converted to the engines of the R-1340-7
JR-3 - the 5-AT-C purchased by the U.S. Navy, three machines, one of them handed over to the USMC, in 1931 renamed to RR-3
RR-4 - other 5-AT-C for the USMC
RR-5 - two 5-AT-D for the US Navy and USMC
Larkins, William T. The Ford Tri-Motor 1922-1992. Schiffer Publishing, West Chester, 1992. ISBN 0-88740-416-2.
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