Engines 1 and 2 supply hot air to their related wings.

Independent Position Determining includes items such as inertial guidance systems, weather radar, doppler, proximity warning, collision avoidance, star tracker, etc. Also includes sextants/octants, etc.

Attitude & Direction section includes items such as gyro horizons, directional gyros, magnetic compasses, and magnetic heading systems, turn and bank, amplifiers, servos, and flight director, etc.

Flight Environmental Data & Pitot Static section includes items such as pitot, static, air temperature, rate-of-climb, airspeed, high speed warning, altitude, altitude reporting, altimeter correction system, etc.

The lighting subsystems used to provide illumination outside of the aircraft, including lights such as landing, navigation, position indicating, wing illumination, rotating, taxi, etc.

That portion of the system which is used to extend and retract the landing gear and open and close the landing gear doors. Includes items such as actuating mechanisms, bogie trim, bungees, up and down latches, operating controls, valves and motors, cables, plumbing, etc.

The units and components are used for recording data not related to specific systems, including items such as flight recorders, performance or maintenance recorders, etc.

The portion of the system is used to indicate the quantity, temperature and pressure of the hydraulic fluid, including items such as transmitters, indicators, warning systems, etc.

The portion of the system which is used to store and deliver hydraulic fluid to using systems. Includes items such as tanks, accumulators, valves, pumps, levers, switches, cables, plumbing, external connectors, etc. Does not include the supply valves to the using systems.

Hydraulic systems include the units and components which furnish hydraulic fluid under pressure (includes pumps, regulators, lines, valves, etc.) to a common point (manifold) for redistribution to other defined systems.

Fuel system also includes integral and tip fuel tank leak detection and sealing. Does not include the structure of integral or tip fuel tanks and the fuel cell backing boards, and does not include fuel flow rate sensing, transmitting and/or indicating.