Downloaded from https://www.everyspec.com MIL-STD-1808B SYSTEM SUB-SYSTEM TITLE DEFINITION 28 FUEL The subsystem components that store and deliver fuel to the engine. Includes engine driven fuel pumps (for reciprocating engines), tanks (bladder), valves, boost pumps, etc., and the components that furnish a means of dumping fuel overboard. 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 covered in the Structures systems. Does not include fuel flow rate sensing, transmitting, and indicating (see System 73, ENGINE FUEL AND CONTROL).
00 GENERAL 10 STORAGE The portion of the system that stores fuel, including external tanks. Includes tank sealing, bladder type cells, ventilating system, cell and tank inter-connectors, over wing filler necks and caps, reservoir feed pumping systems and reservoirs within the tanks (not a part of the distribution system), etc. 20 DISTRIBUTION The portion of the system used to distribute fuel from the filler connector to the storage system and from the storage system to and including the power plant fuel quick disconnect. Includes plumbing, pumps, valves, controls, etc. 30 DUMP The portion of the system used to dump fuel overboard during flight. Includes plumbing, valves, chutes, controls, etc.
40 INDICATING The portion of the system used to indicate the quantity, temperature, and pressure of the fuel. Includes pressure warning systems for pumping systems within the tank, etc. Does not include engine fuel flow or pressure. 50 IN-FLIGHT REFUELING: RECEIVER The portion of the system that provides a means of accepting in-flight refueling. Includes access door controls, actuators, fuel receptor, distribution system to fuel storage or interface with standard fuel distribution system, flow controls and indicators, and audio interconnections with the tanker aircraft.
Includes manual transfer and refueling controls but excludes automatic systems based on fuel quantity and Center of Gravity (CG) constraints (see System 28-60, FUEL/CG MANAGEMENT). 60 FUEL/CG MANAGEMENT The portion of the system that controls fuel distribution during aerial and ground refueling to maintain a safe CG configuration. Uses fuel quantity and stores data to compute aircraft CG. Includes fuel quantity and CG indication for inflight and ground refueling operations. 33