MIL-H-18325B(Aer)
control shall vary the inlet duct air temperature and completey shut off the flow of bleed air
to the heating system.
3.14.2 Partial Output - Means shall be provided for operating the heating SYStem at partial
output. A suitable nameplate conforming to specificatin MIL-P-6906 and showing clearly and
visibly visibly the "off", "intermediate" and "high" positions shall be installed with the controls.
Suitable, concise, clear instruction for the operation of the heating system shall also
incorporated in this nameplate or mounted adjacent to the heating system controls.
ventilating system controls are combined with the heating controls suitable instructions for
the operation of this system also shall be into incorporated.
3.14.3 Leakage - The conrols for the ventilating systsm shall be of such design and construction
that a minimum of leakage results when the system is closed.
3 14.4 Fuel - In addition to the controls and safety features specified in Specification
MIL-H-5484, the heating system shall incorporate suitable automatic control located in
the fUel line as near the fuel take-off from the main fuel system as possible to stop the flow
of fuel if the pressure in the fuel line downstream of this point is reduced by leakage or by
being broken. In carrier type airplanes it is permissible to incorporate a limit switch in
the landing gear ,mechanism in such manner as to cut off the flow of fuel when the landing gear
is lowered as an alternate method of fuel control to that required in Specification MIL-H-5484.
3.14.5 Heated Air - Either a device for lighting a warning light on the pilot's instrument
panel or a system shut-off control as described in paragraph 3.14.1 shall be provided to operate
automatically whenever the emperature of the heated ventilating air exceeds 350 degrees.
Fahrenheit.
3.14.6 Fresh Air - Controllable fresh air intakes shall be provided to admit under the conditions
of flight specified in paragraph 4.2.2.7 of Specification MIL-T-18606(Aer) no less than two
and one fourth (2-1/4) pounds of fresh air per minute per occupant. The ventilating system
shall be constructed so as to deliver the proper amount of such ventilating air to each of thet
Crew stations.
3.14.7 Individual stations - The ventilators shall be manually operated by controled convenient
to the cabin occupants and need be water tight in the closed position Only. Provision shall
be made at the outlet at each crew station for individual control of the volume of air delivered
at this point and the outlets shall be positioned so as to avoid delivering a blast of sir
directly on to the occupant.
3.14.8 Mock-up Inspection - The design and location of the controls and indicators shall be
subject to airplane mock-up inspection and approval.
3.15
Electrical System
3.15.1 Electrical Installation - The installation shall conform to Specifications MIL-E-2030,
MIL-W-5088 and MIL-I-6051. Where equipment is subject to removal for inspection and servicing,
All connectors in conformance with Specification MIL-C-5015 shall be used.
3.15.2 Input Power Requirements - The equipment shall meet applicable requirements of
Specification MIL-E-7894 and shall give specified performance from the following power sources
with characteristics as defined in MIL-E-7894 having limits as specified herein. The power
required shall not exceed the specified amounts. Unspecified values shall be approved by
the procuring agency.
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