MIL-STD-196F
functions are issued automatically with the equipment and are considered "part of "such
equipment.
3.1.6 Variable item levels. Systems, subsystems, centrals, centers, sets, and groups, are those configurations whose scope or functions may be varied through the addition or deletion of sets, groups, units, or combinations thereof. The complement data for a variable nomenclature must show at least one item of varying quantity or have a variable item therein. Units cannot be variables because they do not have complement data.
3.1.7 Modification letters. A modification letter is defined as a letter assigned in alphabetical sequence starting with the letter "A" to show a Modification to a nomenclatured equipment where at least one way interchangeability has been maintained. The modification letter follows the sequentially assigned number. Assigned modification letters to a type designation requires the equipment to be at least one-way interchangeable with all previous models.
3.1.8 Interchangeability.
3.1.8.1 Electrical interchangeability. The modified item's capability of operation is equal to the basic or previous item without requiring any modifications.
3.1.8.2 Functional interchangeability. The modified item is capable of performing, without additional assistance, all the operational capabilities of the basic or previous item.
3.1.8.3 Maintenance (repair) parts interchangeability. Maintenance (repair) parts interchangeability involves the installation and operation of a maintenance part in an item in lieu of a like item without the use of additional tools or modifications to the existing item or mounting facilities and with no appreciable effect on performance or ratings, either electrical or mechanical.
3.1.8.4 Mechanical interchangeability. The modified item is capable of being physically installed and operated in the position previously occupied by the basic or previous item without requiring any major modifications. Switches, connectors, etc., are in the same location, within allowable tolerances. The center of gravity of the new item is the same as in the old item, within allowable tolerances.
3.1.9 "P art of". An item, required to complete the assigned function of the equipment, is "part of' that equipment. Items that are "part of" a nomenclature equipment are always listed in its complement data and issued automatically with the equipment of which it is a part.
3.1.10 "Used with" but not "part of". A listing of equipment that the item is normally used with, but not issued as "part of".
3.1.10.1 Extension of functions. An item which extends the use of an equipment beyond its assigned functions and is issued for use with that equipment only under special circumstances is considered as "used with" but not "part of" that equipment.
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