Aircraft Maintenance Manual – General Introduction

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Sofema Online (SOL) looks at the format & structure of the Aircraft Maintenance Manual.


The Aircraft Maintenance Manual (AMM) is a manual developed by the manufacturer that provides detailed technical maintenance instructions for a specific type of Aircraft.

» The content of the Aircraft Maintenance Manual (AMM) is part of the Instructions for Continued Airworthiness (ICA) that the Type Certificate Holder is required to provide and maintain.

» The data contained in this AMM is in general compliance with ATA 100 Specification (updated by iSpec2200, Information Standards for Aviation Maintenance, and supported by ASD-STE100 Simplified Technical English.

» The AMM text is in Standard Generalized Markup Language (SGML) format. The standard illustrations are in Computer Graphics Metafile (CGM) format.

» The AMM contains the instructions for the on-aircraft maintenance necessary to ensure the continued airworthiness of the aircraft.

» The AMM contains information required to service, repair, replace, adjust, inspect and check equipment and systems on the aircraft. These tasks are normally performed on the ramp or in the maintenance hangar.

» The AMM also contains information about inspections and maintenance of aircraft structures. However, repair of structure is contained in the Structural Repair Manual (SRM)

Concerning AMM Revisions

The maintenance manual is kept current by the Revision Service. A list of effective pages (LEP) is provided with each revision.

There are two types of revisions: 

  1. Normal Revisions (periodic Update & Consolidation of TR)
  2. Temporary Revisions (TR) – Urgent information which the release of which must be prioritized before the next formal release

A Typical AMM Consists of the following  

» Title section provides the name of the manual, the revision date, and the revision number.

» Manufacturer’s contact address and legal notice.

» Transmittal letter.

» The Highlights section provides the reason for the revision of text and/or illustrations. They are sorted by ATA Chapter.

» List of Effective Temporary Revisions – This list is always empty at the delivery of each normal revision. A list of Effective Temporary Revisions is dispatched with each Temporary Revision issued.

» The Introduction provides general information on how to use the manual.

» Effectivity Table that provides the correspondence between Fleet Serial Number (FSN) and Manufacturer Serial Number (MSN).

» List of the Service Bulletins.

» Customer Originated Changes (COC).

Aircraft Maintenance Manual Features

» Servicing

» Removal and Installation

» Deactivation and Reactivation

» Test and Adjustment

o Operational Test

o Functional Test

o System Test

o BITE Test

» Inspection/Check

o Detailed Inspection

o General Visual Inspection

o Special Detailed Inspection

» Cleaning and Painting

» Repairs

Locating Information within the AMM

ATA 00            General

ATA 01            Maintenance Policy

ATA 02            Operations

ATA 03            Support

ATA 04            Airworthiness Limitations

ATA 05            Time Limits/Maintenance Checks

ATA 06            Dimensions And Areas

ATA 07            Lifting And Shoring

ATA 08            Leveling And Weighing

ATA 09            Towing And Taxiing

ATA 10            Parking, Mooring, Storage And Return To Service

ATA 11            Placards And Markings

ATA 12            Servicing

ATA 13            Hardware And General Tools

ATA 15            Aircrew Information

ATA 16            Change Of Role

ATA 18            Vibration And Noise Analysis (Helicopter Only)

ATA 20            Standard Practices- Airframe

ATA 21            Air Conditioning

ATA 22            Auto Flight

ATA 23            Communication

ATA 24            Electrical Power

ATA 25            Equipment /Furnishings

ATA 26            Fire Protection

ATA 27            Flight Controls

ATA 28            Fuel

ATA 29            Hydraulic Power

ATA 30            Ice And Rain Protection

ATA 31            Indicating / Recording System

ATA 32            Landing Gear

ATA 33            Lights

ATA 34            Navigation

ATA 35            Oxygen

ATA 36            Pneumatic

ATA 37            Vacuum

ATA 38            Water / Waste

ATA 39`           Electrical - Electronic Panels And Multipurpose Components

ATA 40            Multisystem

ATA 41            Water Ballast

ATA 42            Integrated Modular Avionics

ATA 44            Cabin Systems

ATA 45            Onboard Maintenance Systems (Oms)

ATA 46            Information Systems

ATA 47            Inert Gas System

ATA 48            In Flight Fuel Dispensing

ATA 49            Airborne Auxiliary Power


ATA 50            Cargo And Accessory Compartments

ATA 51            Standard Practices And Structures - General

ATA 52            Doors

ATA 53            Fuselage

ATA 54            Nacelles/Pylons

ATA 55            Stabilizers

ATA 56            Windows

ATA 57            Wings


ATA 60            Standard Practices - Prop./Rotor

ATA 61            Propellers/ Propulsors

ATA 62            Main Rotor(S)

ATA 63            Main Rotor Drive(S)

ATA 64            Tail Rotor

ATA 65            Tail Rotor Drive

ATA 66            Folding Blades/Pylon

ATA 67            Rotors Flight Control

Power Plant

ATA 71            Power Plant

ATA 72            Engine

ATA 72T          Engine - Turbine/Turboprop, Ducted Fan/Unducted Fan

ATA 72R         Engine - Reciprocating

ATA 73            Engine - Fuel And Control

ATA 74            Ignition

ATA 75            Bleed Air

ATA 76            Engine Controls

ATA 77            Engine Indicating

ATA 78            Exhaust

ATA 79            Oil

ATA 80            Starting

ATA 81            Turbines (Reciprocating Engines)

ATA 82            Water Injection

ATA 83            Accessory Gear Box (Engine Driven)

ATA 84            Propulsion Augmentation


ATA 91            Charts

ATA 97            Wiring Reporting

ATA 115          Flight Simulator Systems

ATA 116          Flight Simulator Cuing System

Peculiar Military Chapters

ATA 92            Electrical Power Multiplexing

ATA 93            Surveillance

ATA 94            Weapon System

ATA 95            Crew Escape And Safety

ATA 96            Missiles, Drones And Telemetry

ATA 98            Meteorological And Atmospheric Research

ATA 99            Electronic Warfare System

AMM Description and Operation (D/O)

The purpose of the D/O is to familiarize maintenance personnel with the aircraft systems and give them sufficient information to understand how the systems operate.

Component Location

System/Component Description

Power Supply (if applicable)

Interface with other systems (if applicable)

Operation/Control and Indicating

System/BITE Test

AMM Maintenance Procedure (MP)

A Maintenance Procedure is made up of Task(s) and Subtasks. Each Task is broken down into the following paragraphs:

» Procedure Title – The title of a maintenance procedure associated with an MPD task is generally identical to the MPD task description.

» Reason for the Job –  Explains the reason for the task.

» Job Set-Up Information – Equipment required for maintenance.

» Job Set-Up or Preparation – This includes Aircraft Maintenance Configuration, Circuit Breakers, and Safety Precautions.

» Procedure – Work steps and also includes sub-tasks.

» Close-Up – Work steps in order to put the aircraft back into its initial configuration.

Job Set-Up Information includes:

» Fixtures, Tools, Test, and Support Equipment – This table provides the fixtures, tools, and equipment that are required for maintenance operation and not part of the mechanic toolbox (standard hand-tool). Fixtures, tools, and equipment are classified into two types of items:

o The non-specific items – also referred to as “NO-SPECIFIC” or “STANDARD”. These items are identified by their main features and should be purchased or manufactured freely on the market.

o The specific items – These items are identified by a PNR (Part Number) and listed in the TEM (Tool and Equipment Manual).

» Consumable Materials – Gives a list of all the materials called up in the maintenance procedure.

» Work Zones and Access Panels – The zones are identified by a three-digit numerical code. This includes all location and access panel information required to perform the task.

» Expendable Parts – Use the Illustrated Parts Catalog (IPC) or the Power Plant Illustrated Parts Catalog (PIPC) to find the corresponding Part Numbers.

» Referenced Information – Any additional information which is necessary to perform a maintenance procedure (task).

AMM Task may contain WARNING, CAUTION, and Note:



NOTE: Calls attention to methods which make the job easier or provide supplementary or explanatory information.

Next Steps

Sofema Aviation Services and Sofema Online provides EASA compliant Regulatory & Vocational Training. For additional details, please see our websites and or email


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