C Operator or crew maintenance
O Unit maintenance
F Direct support maintenance
L Specialized repair activity (SRA)
H General support maintenance
D Depot maintenance
The "L" maintenance level is not included in
column (4) of the MAC. Functions to this level of
maintenance are identified by a work time figure in
the "H" column of column (4), and an associated
reference code is used in the REMARKS column (6).
This code is keyed to the remarks and the SRA
complete repair application is explained there.