MIL-M-27733B(USAF)
vehicle. They are installations or changes which support research development,
design changes to existing Class II modifications, and development and
oerational test and evaluation programs or in-service testing of systems or
equipment.
6.4.2 Modification engineering authority. Activity having program management
responsibility for an engineering effort required to accomplish integration or
installation of Group B items which have been previously developed and tested
or which have been commercially used in the same environment.
6.4-3 Modification number. Number issued by the Configuration Management
Officer responsible for the Class II modificatio project. Modifications,
demodifications, partial modifications, reidentification, or changes shall be
identified by a seven-digit alphabetical/numerical designator, as follows:
M-----Modification
2----last digit of calendar year
A-----first basic modification to aircraft for year
399-----last 3 digits of aircraft serial number
(aircraft tail number)
A-----change indicator to basic modification
(e.g., A=initial, B=first change to basic mod)
Example:
M2A399A - first basic modification in 1982 to aircraft tall number 399
M2A399B - first change to 1982's first basic modification to aircraft tail
number 399
M2B399A - second basic modification in 1982 to aircraft tail number 399
M2B399B - first. change to second basic modification
(1) Basic Modification: Installation of equipment to provide a new or
added capacity. The letter "O" will not be used in designators. If the number
of modifications in a single year exceed 25, the first digit of the aircraft
serial number will be dropped and an additional alphabetical designator added;
e.g., M2ZA99A.
(2) Change to any Basic Modification: The letter "O" will not be used.
If the number of changes exceed 25, the first digit of the aircraft serial
number will be dropped and an additional alphabetical designator added at the
end; e.g., M2B99ZA.
(3) Demodification: Removal of basic modification. Demodifications will
be identified with the original modification number.
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