B. In accordance with the ATA Specification 100, complete system information
is included in subjects identified by the third part of the subject
number being a dash-zero (-0 or-00) number.
(1) The descriptions of units which comprise the system or subsystem are
also included with the complete system information to the extent
necessary for understanding how they work in performing their
function in the system. In those cases where the units are
sufficiently complex, additional description and operation type
information is given at the unit level.