CS 25J1103 Air intake system ducts
ED Decision 2005/006/R
(a) Each
air intake system duct must be:
(1) Drained
to prevent accumulation of hazardous quantities of flammable fluid and
moisture in the ground attitude. The drain(s) must not discharge in locations
that might cause a fire hazard; and
(2) Constructed
of materials that will not absorb or trap sufficient quantities of flammable
fluids such as to create a fire hazard.
(b) Each duct must be:
(1) Designed
to prevent air intake system failures resulting from reverse flow, APU
surging, or inlet door closure; and
(2) Fireproof
within the APU compartment and for a sufficient distance upstream of the APU
compartment to prevent hot gases reverse flow from burning through the APU air
intake system ducts and entering any other compartment or area of the
aeroplane in which a hazard would be created resulting from the entry of hot
gases.
The materials used
to form the remainder of the air intake system duct and plenum chamber of the
APU must be capable of resisting the maximum heat conditions likely to occur.
(c) Each
duct connected to components between which relative motion could exist must
have means for flexibility.
[Amdt 25/1]
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