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|  air volocities in all occupied compartmental of the aircraft under all conditions of
: light.
3.1.5 A thorough investigation with regards to the cleanliness of air
supplied to the cabin shall be made by collecting air namplate in an evacuated
container and analyzing the contents in a laboratory. Sufficient samples shall be
obtained tO COVer all flight conditions end and system operations undications under which it is
possible for contamination to exist, Alternate methods of investigating cabin
contamination must receive prior approval from the Bureau of ronautics.
3.1.6 Equipment shall be'provided'to determine the moisture content of' the
air in crew and passenger compartments of transport type aircraft,
3.2 General operation requirements for- testing
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3.2.1 Tests shall be conducted to demonstrate safe and satisfactory perfor-
m.ante of the system and component equipments under the following conditions:
.
(a) Ground operation
"(b) Transient flight (climb, dive, acceleration)
(c) Steady state, including minimum and maximum flight speeds.
3.2.2 Smoke or gas removal procedures shall be demonstrated to prove con-
elusively that proposed methods of elimination are adequate to clear all areas
occupied by passengers and crew of hazardous concentrations of smoke or gas within a
safe period of' time. The removal of odors from galleys and sanitation areas shall be
demonstrated during actual use of these facilities.
3.2.3 Tests on ventilating and cooling systems shall be conducted during
the daytime to determine the adequacy of' the system with full sun effect and with
maximum daylight electrical load within the fuselage applied.
3.2.4 Tests on heating systems shall be conducted during night time to
eliminate sun effect, and shall be conducted with minimum electrical lend applied with-
in the aircraft cabin.
3.3.1 Air flow measurement.
3.3.1.1 Sections of duct in the normal duct system, calibrated in place in
the aircraft, shall be used to determine the air flow in each component part of the
air conditioning system wherever possible.
3.3.1.2 Calibrated orifices or venturis may be used in duct systems where
added pressure drop does not affect distribution or restrict air flow.
3.3.1.3 In the event callbrated sections of duct or orifices cannot be used,
the use of calibrated pitot-static tubes is permissible, However, icing of the pitot
heads and resulting erroneous data may oocur if this type of instrumentation is used
downstream of refrigeration units.
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