Multiplexed true mass gaging system
 A standardized, modular, fuel quantity gaging system suitable for use with aircraft having a plurality of fuel tanks. The system utilizes a standard electronic module, preferably located on the front spar of the center wing box, to house a redundant, centralized, microprocessor-based electronic assembly. This assembly processes the tank-generated fuel quantity signals and produces a digital data stream which is distributed to display units in the cockpit and at the refueling control panel. The digital signals are transmitted over two 2-wire data busses from the standard electronic module to the cockpit and to the refueling panel. One of these buses is active, the other being held in standby, for use as needed. The two busses are part of separate data processing channels extending between the fuel quantity signal multiplexers in the standard electronic module and the indicators in the cockpit and at the refueling panel. The indicators are basically display only units which receive, decode and display the digital fuel quantity information as it appears on the active data bus. This arrangement permits a high degree of interchangeable modularity among its various components, leading to minimized maintenance and spares provisioning cost. Components can be replaced without any need for recalibration or adjustment of any kind. The system includes equipment for detecting and indicating faults, thus providing improved reliability. 
Gull Airborne Instruments, Inc. McDonnell Douglas Corporation
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G01F G01F
inventional inventional
Martin Charles H. Eugene F.
Horowitz Ritter Orloff