By Roy Langton, Chuck Clark, Martin Hewitt, Lonnie Richards
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Extra resources for Aircraft Fuel Systems (Aerospace Series (PEP))
The -400 version of the Boeing 747 has additional fuel storage in the base of the vertical ﬁn. Airbus uses aft fuel storage to provide active CG control by transferring fuel between the forward tanks (wing and/or center tanks) and the horizontal stabilizer tank (referred to as the trim tank) as fuel is consumed, in order to maintain an optimum longitudinal aircraft CG throughout the cruise segment of the ﬂight. Fuel Storage 35 For reference purposes, the following two ﬁgures show plan-forms of several in- service commercial aircraft showing the different fuel tank storage conﬁgurations.
This is accomplished by moving fuel aft during transonic acceleration and reversing the process during deceleration at the end of cruise. In this application, the need to transfer fuel at the end of cruise is critical to ensure that the aircraft is stable during subsonic ﬂight. As a result the Concorde fuel management system is required to have the functional integrity equivalent to that of the ﬂight control system. See Chapter 12 for a description of the Concorde fuel system. From a lateral stability point of view, the ability of the lateral ﬂight controls to offset any fuel load induced rolling moment due to a lateral CG shift must be understood at the outset.
Two signiﬁcant issues result from this situation: 1. Boost pumps are typically oversized for the cruise ﬂight condition where engine speeds are high and hence pump rotational speeds are high. 2. Power factors are much lower than for constant frequency power systems. Both of the above features impose a weight penalty. Pumps become heavier to accommodate the speciﬁed performance at low frequencies and more current is required to deliver the required power. 2 Identiﬁcation and Mitigation of Safety Risks The initial concept phase must also focus on the identiﬁcation, prioritization and mitigation of system safety risks.