MIL-H-18325B(Aer)
3.15.3
Electric Motors - All motors shall meet the requirements of specification MIL-H-8609
and if located in any space other than the combustion space in the heating system, shall be
explosion proof. All motors shall be self-ventilated.
3.l5.4 Electrice Leads - The electrical cables installed in the airplane shall not be run inside
the heating or ventilating ducts and shall not be in contact with the heating or ventilating ducts
to prevent damage to the cable insulation by high temperatures.
3.15.5 Magnetic Interference - The installation of the heating system shall meet the requirements
of Specification MIL-S-7762 with regard to the effect of the electrical system on any compass
located within the airplane.
3.16 Ventilating System - The ventilating system may be combined with the heating system so that
the set of air scoops and ducts are used for both, if this design proves advantageous. However,
irrespective of the system employed, the ventilating equipment shall meet all the requirements
specified herein.
3.17 Temperature
Surface Temperature Limits - The design and construction of the heating system shall be
3.17.1
such that the temperature of these portions of the outside surface of the case, flue, or any
other portion of the heater installation or ducts within reach of operating personnel shall not
be in excess of 180°F measured in an ambient temperature of 70°F.
Heated Air Limits - The design and construction of the heating system shall be such
3.17.2
that the temperature of the air delivered from the heat exchanger or combustion heater under
any condition of flight shall not exceed 350°F measured at a point in the ventilating air
duct 18 inches downstream of the heat exchanger or combustion heater.
3.17.3 Structural Member Limits - The installation of the heating system shall be such that
the structure member of the airplane is raised above a maximum temperature of 250°F under any
conditions of operation of the heating system.
3.18 Heating Requirement - Type I (Combustion)
3.18.1 Airframe Requirements - The combustion heaters shall be approved heaters meeting all
the requirements of Specification MIL-H-5484 for the type of airplane in which installed.
3.18.2 Starting - The Type I heating system shall be designed constructed so that it will
ignite and operate continuously under any conditions of flight from sea level to the service
coiling of the airplane. The temperature of the exhaust gases from the heater shall not exceed
1000°F measured under any condition of operation of the heating system.
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