Aerodynamic Load Alleviating 23 COMMUNICATIONS -00 General -10 Speech Communications -15 SATCOM -20 Data Transmission and Automatic Calling -30 Passenger Address, Entertainment and Comfort -40 Interphone -50 Audio Integrating -60 Static Discharging -70 Audio & Video Monitoring -80 Integrated Automatic Tuning 24 ELECTRICAL POWER -00 General -10 Generator Drive -20 AC Generation -30 DC Generation -40 External Power -50 AC Electrical Load Distribution -60 DC Electrical Load Distribution 25 EQUIPMENT/FURNISHINGS -00 General -10 Flight Compartment -20 Passenger Compartment -30 Galley -40 Lavatories -50 Additional Compartments -60 Emergency -70 Available -80 Insulation 26 FIRE PROTECTION -00 General -10 Detection -20 Extinguishing -30 Explosion Suppression 27 FLIGHT CONTROLS -00 General -10 Aileron & Tab -20 Rudder & Tab -30 Elevator & Tab -40 Horizontal Stabilizer -50 Flaps -60 Spoiler, Drag Devices and Variable Aerodynamic Fairings -70 Gust Lock & Dampener -80 Lift Augmenting 28 FUEL -00 General -10 Storage -20 Distribution -30 Dump -40 Indicating 29 HYDRAULIC POWER -00 General -10 Main -20 Auxiliary -30 Indicating 30 ICE AND RAIN PROTECTION -00 General -10 Airfoil -20 Air Intakes -30 Pitot and Static -40 Windows, Windshields and Doors -50 Antennas and Radomes -60 Propellers/Rotors -70 Water Lines -80 Detection 31 INDICATING/RECORDING SYSTEMS -00 General -10 Instrument & Control Panels -20 Independent Instruments -30 Recorders -40 Central Computers -50 Central Warning Systems -60 Central Display Systems -70 Automatic Data Reporting Systems 32 LANDING GEAR -00 General -10 Main Gear and Doors -20 Nose Gear and Doors -30 Extension and Retraction -40 Wheels and Brakes -50 Steering -60 Position Indication and Warning -70 Supplementary Gear 33 LIGHTS -00 General -10 Flight Compartment -20 Passenger Compartment -30 Cargo and Service Compartments -40 Exterior -50 Emergency Lighting 34 NAVIGATION -00 General -10 Flight Environment Data -20 Attitude & Direction -30 Landing and Taxiing Aids -40 Independent Position Determining -50 Dependent Position Determining -60 Flight Management Computing 35 OXYGEN -00 General -10 Crew -20 Passenger -30 Portable 36 PNEUMATIC -00 General -10 Distribution -20 Indicating 37 VACUUM -00 General -10 Distribution -20 Indicating 38 WATER/WASTE -00 General -10 Potable -20 Wash -30 Waste Disposal -40 Air Supply 39 *Unassigned 40 *Unassigned 41 WATER BALLAST -00 General -10 Storage -20 Dump -30 Indication 42 Integrated Modular Avionics (IMA) 43 *Unassigned 44 CABIN SYSTEMS -00 General -10 Cabin Core System -20 In-flight Entertainment System -30 External Communication System -40 Cabin Mass Memory System -50 Cabin Monitoring System -60 Miscellaneous Cabin System 45 CENTRAL MAINTENANCE SYSTEM (CMS) -00 General -5 thru -19 CMS/Aircraft General -20 thru -49 CMS/Airframe Systems -45 Central Maintenance System -50 thru -59 CMS/Structures -60 thru -69 CMS/Propellers -70 thru -89 CMS/Power Plant 46 INFORMATION SYSTEMS -00 General -10 Airplane General Information Systems -20 Flight Deck Information Systems -30 Maintenance Information Systems -40 Passenger Cabin Information Systems -50 Miscellaneous Information Systems 47 NITROGEN GENERATION SYSTEM 48 *Unassigned 49 AIRBORNE AUXILIARY POWER -00 General -10 Power Plant -20 Engine -30 Engine Fuel and Control -40 Ignition/Starting -50 Air -60 Engine Controls -70 Indicating -80 Exhaust -90 Oil 50 CARGO AND ACCESSORY COMPARTMENTS -00 General -10 Cargo Compartments -20 Cargo Loading Systems -30 Cargo Related Systems -40 Available -50 Accessory -60 Insulation 51 STANDARD PRACTICES, GENERAL -00 General -10 Investigation, Cleanup and Aerodynamic Smoothness -20 Processes -30 Materials -40 Fasteners -50 Support of Airplane for Repair and Alignment Check Procedures -60 Control-Surface Balancing -70 Repairs -80 Electrical Bonding 52 DOORS -00 General -10 Passenger/Crew -20 Emergency Exit -30 Cargo -40 Service and Miscellaneous -50 Fixed Interior -60 Entrance Stairs -70 Monitoring and Operation -80 Landing Gear 53 FUSELAGE -00 General -10 thru -90 (As Required) Fuselage Sections 54 NACELLES/PYLONS -00