Got it.
Many have used a readily available Wright Field “Type Designation Sheet” (TDS) as a reference to the actual spec, 94-3040, but now that we have the actual US spec and many supporting papers it is clear the TDS contained a number of errors. (It is noted that the microfiche versions do not show the same detail as the paper copies, such as the “x’s” used to cross-out a word on a typewriter are clear on the paper copy but not always on microfiche, so that may have been a factor.)
A-2...
Spec. 94-3040 Jackets, Flying Type A-2
Many have used a readily available Wright Field “Type Designation Sheet” (TDS) as a reference to the actual spec, 94-3040, but now that we have the actual US spec and many supporting papers it is clear the TDS contained a number of errors. (It is noted that the microfiche versions do not show the same detail as the paper copies, such as the “x’s” used to cross-out a word on a typewriter are clear on the paper copy but not always on microfiche, so that may have been a factor.)
A-2...
Spec. 94-3040 Jackets, Flying Type A-2