MAJOR COMPONENTS
The airplane pressurization system consists of
the following major components:
• Cabin pressurization control panel
• Cabin pressure controller (CPC)
• Pressurization indicators
• Primary outflow valve
• Secondary outflow valve
• Vacuum jet pump
PRESSURIZATION
CONTROL PANEL
The pressurization control panel and the ECS
system schematic on the EICAS or MFD pro-
vides the crew-to-system interface capability
for all modes of system operation and moni-
toring (Figure 12-1).
PACK SWITCH
The PACK switch (Figure 12-1), located on
the left side of the pressurization control
panel, is used to control the pack bilevel pres-
sure regulating shutoff valve (PRSOV). When
selected on, engine bleed-air is allowed to
enter the environmental control unit (ECU).
Should the pack bilevel PRSOV not open, due
to a malfunction, the only other method to
provide a source of engine bleed-air for cabin
pressurization is via the emergency pressur-
ization system.
12-2
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
international
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