Aircraft Maintenance Manual – General Introduction
Sofema Online (SOL) www.sofemaonline.com looks at the format & structure of the Aircraft Maintenance Manual.
Introduction
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:
- Normal Revisions (periodic Update & Consolidation of TR)
- 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
Structure
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
Propeller/Rotor
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
Miscellaneous
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:
WARNING: CALLS ATTENTION TO USE OF MATERIAL, PROCESSES, METHODS, PROCEDURES OR LIMITS WHICH MUST BE FOLLOWED PRECISELY TO AVOID INJURY OR DEATH TO PERSONS.
CAUTION: CALLS ATTENTION TO METHODS AND PROCEDURES WHICH MUST BE FOLLOWED TO AVOID DAMAGE TO EQUIPMENT.
NOTE: Calls attention to methods which make the job easier or provide supplementary or explanatory information.
Next Steps
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