ED Decision 2005/006/R
(See AMC 25.1189)
(a) Each
APU compartment specified in CS
25J1181(a) must have a means to shut-off or otherwise prevent hazardous
quantities of flammable fluids, from flowing into, within, or through any
designated fire zone, except that shut-off means are not required for:
(1) Lines, fittings and components forming an
integral part of an APU; and
(2) Oil systems for APU installations in which
all external components of the oil system, including the oil tanks, are
fireproof.
(b) The
closing of any fuel shut-off valve for any APU may not make fuel unavailable
to the main engines.
(c) Operation
of any shut-off may not interfere with the later emergency operation of other
equipment.
(d) Each
flammable fluid shut-off means and control must be fireproof or must be
located and protected so that any fire in a fire zone will not affect its
operation.
(e) No
hazardous quantity of flammable fluid may drain into any designated fire zone
after shut-off.
(f) There
must be means to guard against inadvertent operation of the shut-off means and
to make it possible for the crew to reopen the shut-off means in flight after
it has been closed.
(g) Each
tank to APU shut-off valve must be located so that the operation of the valve
will not be affected by the APU mount structural failure.
(h) Each
shut-off valve must have a means to relieve excessive pressure accumulation
unless a means for pressure relief is otherwise provided in the system.
[Amdt 25/1]
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