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737-600/700/800/900 TRAINING MANUAL
MAINTENANCE DOCUMENTS -- AMM PART 2 - AMTOSS NUMBERS
General
All maintenance tasks and sub-tasks have an aircraft maintenance task oriented support system (AMTOSS) number. These are the reference numbers that you use to find a specified task. AMTOSS numbers show before each task and sub-task in the aircraft maintenance manual (AMM). These are examples of AMTOSS task numbers:
-TASK 29-11-05-000-801
-TASK 49-41-71-000-801
-TASK 71-11-04-410-801-F00.
These are examples of AMTOSS sub-task numbers:
-SUBTASK 870-001-002
-SUBTASK 710-001.
AMTOSS task numbers can have these six parts:
-ATA chapter
-ATA section
-ATA subject
-Function code
-Sequence number
-Configuration.
This is an example of the parts of an AMTOSS task.
AMTOSS TASK 71-11-04-010-804-F00
71 ATA chapter
11 ATA section
AMTOSS TASK 71-11-04-010-804-F00
04 ATA subject
010 Function code
804 Sequence number
F00 Configuration
AMTOSS sub-task numbers can have these three parts:
-Function code
-Sequence number
-Configuration.
This is an example of the parts of the AMTOSS sub-task.
SUBTASK 870-001-002
870 Function code
001 Sequence number
002 Configuration
ATA Chapter, Section, and Subject
These parts identify the airplane part for this task. Each has two digits.
Function Code
The function code defines the maintenance task. It has three alpha-numeric digits. The full definition of the function code is in ATA Specification 100. The first two digits define the type of task. The third digit is
- 203 -
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MAINTENANCE DOCUMENTS -- AMM PART 2 - AMTOSS NUMBERS
737-600/700/800/900 TRAINING MANUAL
not used by Boeing and is always zero. This is a list of the first two digits of the function codes.
Function Codes 0X0: Removal
010 Remove, open for access
020 Remove, disconnect, loosen, remove unit, component, or item
040 Deactivate
070 Erase/delete software or data
080 Remove test or support equipment
Function Codes 1X0: Cleaning
110 Chemical
120 Abrasive
130 Ultrasonic
140 Mechanical
150 Stripping
160 Miscellaneous cleaning
170 Flushing
Function Codes 2X0: Inspection, Checks
210 General visual
220 Detailed dimensional
230 Penetrant
240 Magnetic
250 Eddy current
Function Codes 2X0: Inspection, Checks
260 X-ray holographic
270 Ultrasonic
280 Special or specific
290 Borescope
Function Codes 3X0: Repair
310 Welding or brazing
320 Machining, reaming, or blending
330 Composite
340 Fiberglass, plastic, honeycomb, or epoxy
350 Miscellaneous repair
360 Leakage repair
370 Painting
380 Plating
390 Sealing
Function Codes 4X0: Installation
410 Install, close items removed, opened for access
420 Install, reconnect unit, tighten safety component or item
440 Reactivate
470 Install/load data or software
480 Install test or support equipment
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MAINTENANCE DOCUMENTS -- AMM PART 2 - AMTOSS NUMBERS
737-600/700/800/900 TRAINING MANUAL
Function Codes 5X0: Material and Aircraft Handling
510 Shipping
520 Receiving
530 Packing
540 Unpacking
550 Storage or return to service
560 Marshaling or positioning
570 Engine ferry or pod maintenance
580 Aircraft handling
Function Codes 6X0: Servicing, Preserving, and Lubricating
610 Servicing
620 Preserving
630 De-preserving
640 Lubricating
650 Fueling or defueling
660 Deicing or anti-icing
670 Disinfect or sanitize
680 Drain fluid
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