System Codes
11- Placards 52- Doors
20- Standard Practices 53- Fuselage
21- Air Conditioning 54- Nacelles/Pylons
22- Auto Flight 55- Stabilizers
23- Communications 56- Windows
24- Electrical Power 57- Wings
25- Equipment/Furnishings 60- Propellers Standard Practices
26- Fire Protection 61- Propellers
27- Flight Controls 70- Power Plant Standard Practices
28- Fuel 71- Power Plant General
29- Hydraulic Power 72- Engine Turbine
30- Ice & Rain Protection 72- Engine Reciprocating
31- Instruments 73- Engine Fuel & Control
32- Landing Gear 74- Engine Ignition
33- Lights 75- Engine Air
34- Navigation/Pitot Static 76- Engine Controls
35- Oxygen 77- Engine Indicating
36- Pneumatics 78- Engine Exhaust
37- Vacuum 79- Engine Oil
38- Water/Waste 80- Engine Starting
43- Command Control & Communications 81- Turbines
44- Nuclear Hardness Components & Devices 82- Engine Water Injection
49- APU 83- Accessory Gearboxes
51- Structures 91- Charts
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