MIL-STD-196F
5.22.9 Install ati on indi ca tor lett er "U ". Installation indicator letter "U" is used for an equipment capable of being used in a combination of two or more general installation classes. Equipment that can be used in ground, shipboard, or airborne applications are examples of this type of item. It is also used to identify a combination of two or more general installation classes within any one equipment. For example, part of the equipment is airborne and part of it is on the ground.
5.22.10 Installati on indi cator lett er "V". Installation indicator letter "V" is used for equipment installed in a vehicle designed for functions other than carrying electronic equipment. For example, equipment installed in tanks, and weapon carriers. The equipment must be capable of operation while the vehicle is in motion.
5.23 Equipment type indicator letters requiring further definition (see table I).
5.23.1 T yp e indi cator let ter "P ". Equipment type indicator letter "P" is used for the following
types of equipment:
a. Radar equipment.
b. Beacons which function with radar equipment.
c. Electronic recognition and identification systems. d. Pulse-type navigational equipment.
5.23.2 T yp e indi cator let ter " Z". Equipment type indicator letter "Z" is used for secure communications equipment and is to be used only by the NSA.
5.24 Identification of systems, subsystems, centers, centrals, sets, group and units with modified power requirements. A change in the power input voltage, phase, or frequency is identified by the addition of the letters "X", "Y", or "Z" to the basic nomenclature. For example, if Radio Set AN/TRC-100 were modified to permit its operation on 24 volt DC rather than 110 volt AC, it would be identified as Radio Set AN/TRC-100X. (A modification other than to the power input would be identified as AN/TRC-100A). Simultaneous modifications providing improvements as well as a power change could be identified by the modification letter "A", to show product improvements, and modification letter "X", to show power input differences (i.e., AN/TRC-
1OOAX). The first power input modification would be identified with the letter "X", the second
"Y", the third "Z", the fourth "XX", etc.
5.25 Application of type designators to developmental/experimental equipment. The Request for Nomenclature will indicate experimental/development type in block 12 of the DD Form 61, and block 13 will show an open bowlegs "( )". Example are a Radio Set AN/ARC-( ), or a
Power Supply PP- ( )/U. Part numbers are not required on development models, but they do help keep versions separate. When the production model is ready, a new Request for Nomenclature will be submitted for assignment, not a revision, with the correct type designation already filled
in block 13, leaving the empty bowlegs "( )" off. The original DD Form 61 that was submitted
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