B/E AEROSPACE
COMPONENT MAINTENANCE MANUAL
4521
INTRO-2
22 Aug 2011
25-34-80
Use or disclosure of information on this page is subject to
the restrictions in the proprietary notice of this document.
TASK 25-34-80-990-809-A01
3.
Maintenance Task Oriented Support System
A. The Maintenance Task Oriented Support System (MTOSS) permits the use of electronic data
processing of maintenance data.
NOTE:
For detailed information, refer to Component Maintenance Manual (CMM) of the Air
Transport Association (ATA) Specification 2200.
(1)
The MTOSS system uses standard and unique number combinations to identify maintenance
tasks and sub tasks.
(2)
The MTOSS structure is a logical approach to organizing maintenance tasks and sub tasks.
(3)
The MTOSS numbering system includes ATA chapter-section-subject number as well as a
function code and unique identifiers.
(4)
The purpose of the MTOSS numbering system is to provide a means for automated sorting,
retrieval, and management of digitized data.
B. The MTOSS numbering system is an expansion of the ATA three element numbering system. An
MTOSS number has seven elements of which the first five elements are mandatory for each task and
sub task. The sixth and seventh elements are applied when necessary. This CMM incorporates the use
of six of the seven elements. Refer to Figure INTRO-1.
(1)
Element numbers 1, 2, and 3. These elements are existing ATA numbers:
(a)
Element number 1: Chapter
(b)
Element number 2: Section
(c)
Element number 3: Subject
(2)
Element number 4. The fourth element numerically defines the maintenance function being
performed.
(3)
Element number 5. The fifth element is provided to create unique numbers for all tasks or sub
tasks that are similarly numbered through the first four elements.
(a)
Tasks are numbered from 801 - 999.
(b)
Sub tasks are numbered from 001 - 800.
(4)
Element number 6. The sixth element is a three position alphanumeric number that allows for
identification of differences in configurations, methods, and techniques, variations of standard
practice applications, etc.
(a)
Most tasks in this CMM will use A01 as the sixth element. This indicates that the task
applies to all configurations with no variation.
(b)
If an S01 is used as the sixth element, it will indicate that a service bulletin applies to the
task.
(5)
Element number 7. The seventh element is a three position alphanumeric number reserved for
customer use.
