Standard practices- airframe
ATA 20
Air conditioning and pressurization
ATA 21
Autoflight
ATA 22
Communications
ATA 23
Electrical power
ATA 24
Equipment furnishings
ATA 25
Fire protection
ATA 26
Flight controls
ATA 27
Fuel
ATA 28
Hydraulic power
ATA 29
Ice and rain protection
ATA 30
Indicating / Recording system
ATA 31
Landing Gear
ATA 32
Lights
ATA 33
Navigation
ATA 34
Oxygen
ATA 35
Pneumatic
ATA 36
Vacuum
ATA 37
Water waste
ATA 38
Electrical - electronic panels and multipurpose components
ATA 39