Skin Air Outlet Valve
 Figure 009

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 Skin Air Outlet Valve
 Figure 009A

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 Skin Exchanger Inlet Bypass Valve/Skin Exchanger Isolation Valve/
 Skin Exchanger Outlet Bypass Valve
 Figure 010

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 H. Skin Exchanger Outlet Bypass Valve (Ref. Fig. 010) The skin exchanger outlet bypass valve 23HQ is installed downstream of the skin heat exchanger. This valve is identical to the skin exchanger inlet bypass valve 16HQ. The function is to admit avionics compartment air into the system when the skin heat exchanger efficiency is degraded.
 J. Conditioned Air Inlet Valve (Ref. Fig. 011) The conditioned air inlet valve 21HQ is installed in a duct which is connected to the cockpit main supply duct. This valve is similar to the skin exchanger inlet bypass valve 16HQ. The function is to admit cockpit supply air into the system to ensure the cooling function in case of failure.
 K. Check Valve (Ref. Fig. 012) The check valve 2140HM is installed downstream of the blower fan 20HQ. The check valve is installed in line between the ducts. Two semi-circular flaps are installed on a hinge-bar, a spring holds these semi-circular flaps in the closed position. Airflow from the blower fan 20HQ lifts the semi-circular flaps from their seats. This allows air to flow through the check valve to the avionics ventilation system. Airflow in the opposite direction through the check valve pushes the semi-circular flaps back onto their seats to stop the airflow. An arrow on the check valve casing shows the direction of the airflow through the check valve.
 L. Check Valve (Ref. Fig. 013) The check valve 2150HM is installed aft of the skin air inlet valve 15HQ. The purpose of the check valve is to protect the system at the air inlet against possible adverse effect caused by cabin differential pressure.

R **ON A/C 001-001, 051-052,
 M. Filter Assembly (Ref. Fig. 014) The two-stage filter assembly 2081HM, 2082HM, 2083HM, 2095HM is installed upstream of the blower fan 20HQ. The first-stage is a cleanable plate type filter 2081HM which removes dust particles above 1000 microns and a multi-layer filter which removes water particles. The second stage is a cleanable, corrugated-cartridge-barrier filter 2082HM which removes any dust particles above 400 microns (Ref. ARINC 600). The filter assembly is designed to allow easy access for cleaning.

 Conditioned Air Inlet Valve Figure 011
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 Check Valve Figure 012
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 Check Valve Figure 013 
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 Filter Assembly Figure 014 
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 **ON A/C 002-049, 051-099, 101-105,
 M. Filter Assembly (Ref. Fig. 014A) The two-stage filter assembly 2081HM, 2082HM, 2083HM, 2095HM is installed upstream of the blower fan 20HQ. The first-stage is a cleanable plate type filter 2081HM which removes dust particles above 1000 microns and a multi-layer filter which removes water particles. The second stage is a cleanable, corrugated-cartridge-barrier filter 2082HM which removes any dust particles above 400 microns (Ref. ARINC 600). The filter housing is fitted with pressure test ports to check for clogging of both the demister filter and the dust filter cartridge. This can be achieved by means of a portable manometer. The dust filter cartridge is made of two parts which can be cleaned independently:
 -
the body,

 -
the filter element. The body can only be cleaned. The filter element can be cleaned (twice maximum), reconditioned or replaced. The filter assembly is designed to allow easy access for cleaning.

R **ON A/C 301-399, 401-499,
 M. Filter Assembly (Ref. Fig. 014B) The two-stage filter assembly 2081HM, 2082HM, 2083HM, 2095HM is installed upstream of the blower fan 20HQ. The first stage is a demister filter 2081HM which removes dust particles above 1000 microns and water particles. The second stage is a corrugated-cartridge-barrier filter 2082HM which removes any dust particles above 75 microns (Ref. ARINC 600). The filter housing 2083HM is fitted with pressure test ports to check for clogging of both the demister filter and the dust filter cartridge. This can be achieved by means of a portable manometer. The syphon assembly 2095HM is attached to the filter housing. Its function is to drain the water, filtered by the demister filter.
　
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