Performance Criteria Of Engine Main Fuel Pumps

The key performance criterion for the high-pressure positive displacement stage of a main fuel pump is to be capable of delivering the volumetric fuel flow rate required by the engine for all operating conditions. Before it is released for flight usage, the test sequence with which the positive displacement stage must successfully comply is primarily directed at evaluating the durability of the stage under the most extreme conditions it is expected to encounter in service. There are success criteria for these tests. At the completion of each individual test, the stage must meet its specified volumetric flow service limits. Upon completion of all the tests, the unit is subjected to a teardown inspection and the component parts must not exhibit any unusual wear or distress and must be in a condition that is deemed acceptable for continued service.

The key performance criterion of the boost stage is to provide adequate pressure to the inlet of the gear stage to suppress fuel vaporization and cavitation for all operating conditions; that is, with assistance from the airframe boost pumps and the emergency conditions without assistance from the airframe boost pumps. The tests that confirm this capability are run in conjunction with the positive displacement stage and are subject to similar success criteria. The performance criteria that specifically determine the design of the boost and high-pressure main fuel pump are presented in the following discussions.

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Survival Treasure

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