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Aircraft ventilation and A/C systems and components require leak testing to insure proper operation. Components are typically tested using helium vacuum methods whereas complete systems can be tested using helium and/or hydrogen sniffing techniques.
Helium Sniffing (HS): A manual method of sniffing a pressurized part to detect helium escaping a leak.
Helium Vacuum (HV): An automated method where the test part or test fixture is evacuated to full vacuum while helium is introduced to the opposite barrier of the part.
Multi-Gas Sniffing (MS): A manual method of sniffing a pressurized part using a variety of instruments specifically designed for non-helium tracer gases such as refrigerants, hydrogen and SF6.
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