Lockheed L-1011 ATAs

Here is a ist of the ATAs used on the L--1011 (system ATAs)

• 21 - Air Conditioning
• 22 - Autoflight (Autopilot)
• 23 - Communications
• 24 - Electrical Power
• 25 - Equipment and Furnishings
• 26 - Fire Protection
• 27 - Flight Controls
• 28 - Fuel System
• 29 - Hydraulic Power
• 30 - Ice and Rain Protection
• 31 - Instruments (Instrumentation)
• 32 - Landing Gear
• 33 - Lights (Lighting) Flight Station, Cabin, Cargo Compartments, Exterior, Emergency
• 34 - Navigation
• 35 - Oxygen Flight Station and Cabin (two very different systems)
• 36 - Pneumatic Power
• 38 - Water/Waste (drinking water, waste water)
• 49 - APU
• 52 - Doors - passenger cabin, cargo
• 70/80 - Powerplant-related (many are Rolls Royce)

A Delta Airlines Troubleshooting Course for ATAs can be found here : ATA Documents (Delta)

There are also ATA numbers prior to 21, but they are not system-related.