User's Manual

ABBREVIATED COMPONENT MAINTENANCE MANUAL
1458-A-1101 / 1458-A-1300
(b) Elements 1, 2, and 3 identify the ATA Chapter-Section-Subject number of the page block.
(c) Element 4 defines the maintenance function being performed. This element is a three
position element. The third position is zero filled when further definition is not required. If
required, the manufacturer will use the numbers 1 thru 9 or letters A thru Z, excluding the
letters I and O. Refer to Table 3.
(d) Element 5 provides a unique identification for each TASK or SUBTASK number which is
similarly numbered through the first four elements.
• TASKS are numbered from 801 thru 999
• SUBTASKS are numbered from 001 thru 800.
(e) Element 6 is a three position alphanumeric element used for identification of differences
in configurations, methods or techniques, variations of standard practice applications, etc.
(f) Element 7 provides coding of those tasks or subtasks that have been changed by the
customer (e.g., those tasks or subtasks accomplished by an outside repair source).
Figure 2. (Sheet 1 of 1) MTOSS Code Positions (GRAPHIC 23-15-30-99B-802-A01)
Table 3. MTOSS Function Code Definitions
Code
Function Definition
000
REMOVAL AND DISASSEMBLY
010
Removal Removal of the engine/component from a
workstand, transport dolly, test stand, etc., or
aircraft.
020
Remove Modular Sections This is the first echelon of disassembly which
consists of sectionalization of the unit/engine
into primary modular sections. Modular
sections are identified by the third element
of the ATA number when removed from the
unit/engine.
EFFECTIVITY
ALL
23-15-30
Page9of70
5 Oct 2012
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10-Feb-2013