MANUAL RATE SELECTOR
KNOB
The manual rate selector knob allows the crew
to select the rate of change when the CPCS is
in manual mode. The knob is labeled MAN-
UAL, has UP and DN arrows, and is located
next to the landing altitude knob on the pres-
surization control panel (Figure 12-2). Once
manual rate of change is selected, the crew
determines how fast the cabin pressurization
system reaches the desired cabin altitude. For
each detent of the knob the manual rate changes
100 fpm. The selected rate is temporarily dis-
played preceeded by letters “MR” (manual
rate) in the CPC LCD display window, re-
placing the actual cabin rate. Five seconds
after the manual rate is adjusted, the “MR”
and manual rate will be replaced with the ac-
tual CAB RATE. When the desired cabin alti-
tude is approached, the manual control knob
must be rotated in the appropriate direction
until the manual cabin rate reaches zero.
CABIN PRESSURE
CONTROLLER
The cabin pressure controller (CPC) is a dual
channel microprocessor-based electronic unit
mounted on the co-pilot’s lower switch panel
(Figure 12-2). The CPCS has a redundant
cabin pressure control scheme utilizing the
two channel controller with independent power
sources and sensors for each channel.
The primary channel (left) controls only the
primary outflow valve and the secondary chan-
nel (right) controls only the secondary outflow
valve. However, both outflow valves respond
to either channel due to a pneumatic line that
12-4
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
international
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