CS 25J1091 Air intake

The air intake system for the APU:

(a)Must supply the air required by the APU under each operating condition for which certification is requested,

(b)May not draw air from within the APU compartment or other compartments unless the inlet is isolated from the APU accessories and power section by a firewall,

(c)Must have means to prevent hazardous quantities of fuel leakage or overflow from drains, vents, or other components of flammable fluid systems from entering,

(d)Must be designed to prevent water or slush on the runway, taxiway, or other airport operating surface from being directed into the air intake system in hazardous quantities,

(e)Must be located or protected so as to minimise the ingestion of foreign matter during takeoff, landing, and taxiing.

[Amdt 25/1]