TM 9-2320-366-34-1
1-21. AIR SYSTEM
Figure 1-33. Air System
The air system provides clean, dry air for use in the brake system and the Central Tire Inflation System (CTIS). The
air system is pressurized by an engine driven air compressor (1, Figure 1-33) with a nominal output pressure of 125
psi (862 kPa). The system pressure is controlled by an unloading type pressure governor (2) which maintains the
output pressure between 105 psi (724 kPa) and 125 psi (862 kPa). Air is supplied to the air brake portion of the air
system from the primary and secondary air tanks. Air for the CTIS comes from the wet tank (3) and is supplied to the
axles by the CTIS manifold valve (4). Air pressure in the tires is controlled by the CTIS Electronic Control Unit (ECU)
(5). The CTIS ECU provides for four tire pressure settings.
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