ATA chapter
ATA chapters are a standard numbering system that classifies aircraft systems and components for documentation and inventory.
The system, maintained through the Air Transport Association standards, gives every aircraft system a chapter number, such as 32 for landing gear or 49 for the auxiliary power unit.
It provides a shared vocabulary across manuals, maintenance planning, inventory categorisation and market analysis.
ATA classification makes demand analysis possible at a system level rather than one part number at a time.
RELATED TERMS
An alternate or superseding part number is an approved substitute for the requested part, eligible for the same application.
MRO covers the organisations and activities that maintain, repair and overhaul aircraft, engines and components.
The aviation aftermarket is the market for parts, repairs and services supporting aircraft after delivery, distinct from original manufacture.
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