Perhaps you could tell me how the ties can be EXACTLY 1 inch apart? Is there an implied tolerance associated with such a measurement? From an engineering standpoint, it is not possible for anything to be EXACTLY 1 inch unless the thing itself is the standard for defining the inch.
Knowing the FAA, there is. Since I am not involved in this particular epsiode of silliness by the feds (I got out of the aircraft business years ago), my guess is that the tolerance will be +/- .125" and possibly as much as +/-.25" (although I doubt it!).
I will also speculate that they will have had to specify whether the spacing is based upon 1" centers or 1" between cable ties, thereby making the actual spacing >1" since the cable tie width must be included in the overall spacing specification.