ED Decision 2016/010/R
(See AMC 25J955)
(a) Each
fuel system must provide at least 100 percent of the fuel flow required by the
APU under each intended operating condition and manoeuvre. Compliance must be
shown as follows:
(1) Fuel must be delivered at a pressure
within the limits specified for the APU.
(2) For essential APUs:
(i) The
quantity of fuel in the tank may not exceed the amount established as the
unusable fuel supply for that tank under the requirements of CS 25.959 plus that
necessary to show compliance with this paragraph.
(ii) Each
main pump must be used that is necessary for each operating condition and
attitude for which compliance with this paragraph is shown, and the
appropriate emergency pump must be substituted for each main pump so used.
(iii) If
there is a fuel flowmeter, it must be blocked and the fuel must flow through
the meter or its bypass. (See AMC
25J955(a)(2)(iii).)
(b) For
essential APUs:
If an APU can be supplied with fuel from more than one tank, the fuel
system must, in addition to having appropriate manual switching capability, be
designed to prevent interruption of fuel flow to that APU, without attention
by the flight crew, when any tank supplying fuel to that APU is depleted of
usable fuel during normal operation, and any other tank, that normally
supplies fuel to that APU, contains usable fuel.
[Amdt 25/1]
[Amdt 25/18]
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