Monogram Systems
COMPONENT MAINTENANCE MANUAL
BASIC PN 15900
38-31-09
Page 1002
May 17/02
C. Effectivity
The applicability of a particular part of its primary assembly is indicated by a code
letter or letters in the "USAGE CODE" Column of the PARTS LIST. Normally,
when four or less primary assemblies (initial entries) are broken down in an individual
list, the code letters assigned to each primary assembly are listed opposite an
individual part to indicate its applicability. When five or more primary assemblies are
broken down, a double alphabetical letter is included in the "USAGE CODE" Column
and an explanation of the code letters used is included as the final entry of the list. If
no entry is made in the "USAGE CODE" Column, the individual part is common to
all primary assemblies listed.
D. Abbreviations
Abbreviations used in the parts list section are as follows:
AR As Required
ASSY Assembly
CH Chapter
CMM Component Maintenance Manual
Corp Corporation
FIG. Figure
FRO Future Replacement Order
LLT Liquid Level Transmitter
NHA Next Higher Assembly
No. Number
OM Overhaul Manual
PN Part Number
REQ Required
RF Reference
REPLD Replaced The part in the part number
column is replaced by and interchangeable
with the item number shown in the notation.
REPLS Replaces The part in the part number
column replaces and is interchangeable with
the item number shown in the notation.
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