The test procedure applies to the refueling manifold system connecting the receiver aircraft fuel tanks to the refueling source fuel pump(s) for both ground and aerial refueling. The test procedure is intended to verify that the limit value for surge pressure specified for the receiver fuel system is not exceeded when refueling from a refueling source which meets the requirements of AS1284 (reference 2). This recommended practice is not directly applicable to surge pressure developed during operation of an aircraft fuel system, such as initiating or stopping engine fuel feed or fuel transfer within an aircraft, or the pressure surge produced when the fuel pumps are first started to fill an empty fuel manifold.
This Aerospace Recommended Practice (ARP) covers a brief discussion of the icing problem in aircraft fuel systems and different means that have been used to test for icing. Fuel preparation procedures and icing tests for aircraft fuel systems and components are proposed herein as a recommended practice to be used in the aircraft industry for fixed wing aircraft and their operational environment only. In the context of this ARP, the engine is not considered to be a component of the aircraft fuel system, for the engine fuel system is subjected to icing tests by the engine manufacturer for commercial and particular military applications.
To describe useful methods for conducting pressure drop tests of fuel system components for MIL-F-8615 or similar requirements; and to present general suggestions for improving accuracy of test results.
To describe useful methods for conducting pressure drop tests of fuel system components for MIL-F-8615 or similar requirements and to present general suggestions for improving accuracy of test results.
This document provides recommended methods and describes associated equipment and test setups to assist in understanding and conducting pressure drop tests on fuel system components. Background information and suggestions are provided as means of improving accuracy and repeatability of test results. Although written specifically for fuel system components, the methods, equipment and suggestions presented herein apply equally to pressure drop tests of other liquid-handling devices.