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|  MIL-T-18606(Aer)
3.3.1.4 All pressures shall be recorded simultaneously at regular intervals
a common reference pressure shall be used for all pressures recorded.
3.3.2 Temperature measurements.
3
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t
3.3.2.2 All temperatures shall be recorded us near simultaneously as
possible at regular intervals
3.3.2.3 Thermocouples shall be so located as to determine all temperatures
necessary for complete evaluation of system operation.
3.3.3 Pressure measurements
3.3.3.1 All pressure taps shall be sO located as to minimize the effect of
turbulence caused by valves, elbows, or orifices installed in the system.
3.3.3.2 Pressire taps shall be so located as to determine all pressures
required for a complete evaluation of system operation.
3.3.4 Humidity measurement.-Humidity measurements shall be taken within the
cabin of transport aircraft at regular intervals using, a reliable type of psychromoter.
3.3.5 Air velocity measurements.
3,3*5,1 A suitable velometer shall be used to determine air velocities in
passenger and crew compartments.
3.3.5.2 Air velocities across the cabin thermostat sensing element and
temperature indicating instrument, if installed, shall be determined by use of a suit-
able velometer.
3.3.6 Time measurements. Time measurementsand time intervalscontinuouslyto
shall be recorded
changes
required
in order that rates of temperature and pressure
obtain stabilized conditions within the cabin can be noted.
QUAITY ASSURANCE PROVISIONS
4.
4.1 Ground tests.
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condition.
4.1.1.1.2 If the installation does not include blowers required for ground
operation, external equipment required to supply in-flight conditions shall be attached,
4.1.1.1.3 With blowers in operation, the aircraft heating system shall be
turned on and checked for normal operation. System shall be adjusted as required.
4.1.1.3.4 With system operating normally, the combustion air source shall be
disconnected or deactivated, to determine that no unsafe condition will.be created by
loss of combustion air through failure of combustion air blower or icing of combustion
air scoop in flight.
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