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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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