The revision status of manual D2514-15-13 for the Cessna 310R/T310R aircraft is as follows:
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Current revision: Revision 15, dated 17 June 2005
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Covers models: 310R and T310R, model years 1975 through 1981
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Originally issued: 1 October 1975
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Complete manual was reissued in full with Revision 15, which consolidates previous temporary revisions (3, 4, 5, 6, 7, 8, and 9) into a finalized version.
So if you're working with D2514-15-13, Revision 15 is the latest and most complete version available as of June 2005.