Quick view Add to Cart Modification of T-28A to T-28D, Incorporating R1820-56S Engine and Increased Armament Capability Document Part Number: T.O. No. 1T-28A-544D Number of pages: 1Part Number: T.O. No. 1T-28A-544DRevision Date: 20-July-1965 MSRP: Was: Now: $15.00