User's Manual

ABBREVIATED COMPONENT MAINTENANCE MANUAL
1458-A-1101 / 1458-A-1300
Figure 1. (Sheet 1 of 1) Symbols (GRAPHIC 23-15-30-99B-801-A01)
D. Units of Measure (Subtask 23-15-30-99F-004-A01)
(1) Measurements, weights, temperatures, dimensions, and other values are expressed in the
USMS followed by the appropriate SI metric units in parentheses. Some standard tools or
parts such as drills, taps, bolts, nuts, etc. do not have an equivalent.
E. Illustration (Subtask 23-15-30-99F-005-A01)
(1) Supplemental illustrations use a suffix number to the basic figure number. For example, if
Figure 501-5 is used, it signifies that it is an illustration of the item identified by index number 5
in Figure 501.
(2) Illustrations with no specific designation are applicable to all units.
F. Application of Maintenance Task Oriented Support System (MTOSS) (Subtask 23-15-30-
99F-006-A01)
(1) In accordance with the ATA Specification 2200, this publication uses a Maintenance Task
Numbering System which make the maintenance procedures in this manual compatible with
an automated shop environment.
(
2)
T
he system uses standard and unique number combinations to identify maintenance tasks
a
nd subtasks.
(3) The MTOSS structure is the logical approach to organizing maintenance tasks and subtasks.
The MTOSS numbering system includes the ATA Chapter-Section-Subject number as well as a
function code and unique identifiers. The purpose of incorporating the MTOSS numbering
system is to provide a means for the automated sorting, retrieval, and management of
digitized data.
(4) Section and Sub-section Numbering System
(a) All procedures in this publication have TASK and SUBTASK numbers at key data retrieval
points. The numbers provide the following:
• Identification of the hardware (part or parts) primary to the TASK
• Identification of the maintenance function applied to the part or parts
• A unique identifier for a set of instructions (known as TASK or SUBTASK)
• Identification of alternate methods and configuration differences that change the
procedure applied to the TASK
• Identification of airline changes to a TASK or SUBTASK.
(5) Components of Task and Subtask Number
(a) The numbering system is an expansion of the ATA three-element numbering system. The
number has seven elements. The first five elements are necessary for each TASK or
SUBTASK. The sixth and seventh elements are applied only when necessary. Refer to
Figure 2 (GRAPHIC 23-15-30-99B-802-A01).
EFFECTIVITY
ALL
23-15-30
Page 8 of 70
5 Oct 2012
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