(a) There must be complete drainage of each part of each designated
fire zone to minimize the hazards resulting from failure or malfunction of
any component containing flammable fluids. The drainage means must be --
(1) Effective under conditions expected to prevail when drainage is
(2) Arranged so that no discharged fluid will cause an additional fire
(b) Each designated fire zone must be ventilated to prevent the
accumulation of flammable vapors.
(c) No ventilation opening may be where it would allow the entry of
flammable fluids, vapors, or flame from other zones.
(d) Ventilation means must be arranged so that no discharged vapors
will cause an additional fire hazard.
(e) For category A rotorcraft, there must be means to allow the crew to
shut off the sources of forced ventilation in any fire zone (other than
the engine power section of the powerplant compartment) unless the amount
of extinguishing agent and the rate of discharge are based on the maximum
airflow through that zone.