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ATA Chapter Numbers Reference List

ATA chapter numbers are the common filing system for aircraft maintenance manuals, illustrated parts catalogues, task cards and defect reports. This searchable list gives the chapter number, the standard title and the group it belongs to.

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ATA chapter	System title	Group
05	Time Limits / Maintenance Checks	General
06	Dimensions and Areas	General
07	Lifting and Shoring	General
08	Leveling and Weighing	General
09	Towing and Taxiing	General
10	Parking, Mooring, Storage and Return to Service	General
11	Placards and Markings	General
12	Servicing	General
18	Vibration and Noise Analysis (Helicopter)	General
20	Standard Practices Airframe	General
21	Air Conditioning	Aircraft systems
22	Auto Flight	Aircraft systems
23	Communications	Aircraft systems
24	Electrical Power	Aircraft systems
25	Equipment / Furnishings	Aircraft systems
26	Fire Protection	Aircraft systems
27	Flight Controls	Aircraft systems
28	Fuel	Aircraft systems
29	Hydraulic Power	Aircraft systems
30	Ice and Rain Protection	Aircraft systems
31	Indicating / Recording Systems	Aircraft systems
32	Landing Gear	Aircraft systems
33	Lights	Aircraft systems
34	Navigation	Aircraft systems
35	Oxygen	Aircraft systems
36	Pneumatic	Aircraft systems
37	Vacuum	Aircraft systems
38	Water / Waste	Aircraft systems
44	Cabin Systems	Aircraft systems
45	Central Maintenance System	Aircraft systems
46	Information Systems	Aircraft systems
47	Nitrogen Generation System	Aircraft systems
49	Airborne Auxiliary Power	Aircraft systems
51	Standard Practices and Structures General	Structures
52	Doors	Structures
53	Fuselage	Structures
54	Nacelles / Pylons	Structures
55	Stabilizers	Structures
56	Windows	Structures
57	Wings	Structures
60	Standard Practices Propeller / Rotor	Propeller and rotor
61	Propellers / Propulsors	Propeller and rotor
62	Main Rotor(s)	Propeller and rotor
63	Main Rotor Drive(s)	Propeller and rotor
64	Tail Rotor	Propeller and rotor
65	Tail Rotor Drive	Propeller and rotor
66	Rotor Blade and Tail Pylon Folding	Propeller and rotor
67	Rotors Flight Control	Propeller and rotor
71	Power Plant	Power plant
72	Engine	Power plant
73	Engine Fuel and Control	Power plant
74	Ignition	Power plant
75	Air	Power plant
76	Engine Controls	Power plant
77	Engine Indicating	Power plant
78	Exhaust	Power plant
79	Oil	Power plant
80	Starting	Power plant
81	Turbines (Reciprocating Engines)	Power plant
82	Water Injection	Power plant
83	Accessory Gear Boxes (Engine Driven)	Power plant
84	Propulsion Augmentation	Power plant
85	Fuel Cell Systems	Power plant

Chapter numbers follow the ATA 100 / iSpec 2200 numbering used by most OEM manuals. Manufacturers add their own section and subject numbers below the chapter (the ATA 21-51-01 style). Always confirm titles against your OEM manual revision.

Defect trending by ATA chapter

Optional review of how your defect records could be queried by system and repeat rate.

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How to use the list

Type a chapter number or a system word such as hydraulic or landing into the search box to filter the table. Use it when coding defects in your maintenance system, when sorting work package task cards by system, or when reading an unfamiliar OEM manual. Export to Excel to build a pick list for a defect coding screen, or to PDF to print a desk reference for the planning office.

Search by number or by words in the title
Group column separates systems, structures, propeller and rotor, and power plant
Export keeps all 65 rows for use as a lookup tab

How the numbering is built

A full ATA reference has three parts: chapter, section and subject, written as ATA 32-31-01. The chapter tells you the system (32 is landing gear), the section the sub-system (31 covers extension and retraction in many manuals) and the subject the individual unit or task. Only the two digit chapter is standardised across manufacturers. Section and subject numbers differ between OEMs and sometimes between models of the same OEM, so a code mapping built for one fleet should not be reused blindly for another.

Common mistakes and ERP notes

The most common error is storing the ATA code as a number. Chapter 05 becomes 5 and no longer sorts or joins to the manual. Store it as a two character text field. A second error is mixing chapter level coding for reliability reports with section level coding for task cards in the same field. Most MRO and ERP systems let you hold the chapter, section and subject in separate columns, which makes defect trending by system far easier.

Keep the leading zero
Hold chapter, section and subject separately
Gaps in the list (13 to 17, 39 to 43) are reserved or unused numbers, not missing data

Frequently Asked Questions

What does ATA stand for?

ATA stands for Air Transport Association of America, now Airlines for America. The ATA 100 specification created the chapter numbering, and it was later carried into the iSpec 2200 standard that most OEMs use for manuals and data exchange.

What is the difference between ATA 100 and iSpec 2200?

ATA 100 is the older specification for manual structure and numbering. iSpec 2200 replaced it and added digital data requirements, but it kept the same chapter numbers, so the list stays valid for both.

Which ATA chapters are engine related?

Chapters 71 to 85 cover the power plant. ATA 72 is the engine itself, 73 fuel and control, 79 oil and 80 starting. Chapter 49 covers the auxiliary power unit and 54 covers nacelles and pylons.

Are ATA codes the same for helicopters?

The chapter numbers are shared, with rotorcraft using 60 to 67 for rotors and drives and 18 for vibration analysis. Always check the manufacturer manual because section numbers vary.

If your defect and task data already carries ATA codes, we can build a read-only question layer over it so planners can ask for repeat defects by system in plain language.

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