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field elevation, at the selected up/down rate.
Landing Mode
The landing mode is entered when the CPC receives a weight-on-wheels signal from the
PSEU and the thrust levers are at idle. The cabin altitude is driven up at the selected rate for
60 seconds, and then the CPC reverts to ground mode (outflow valves are driven fully open).
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−16
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Touch-and-Go Mode
On airplane touchdown, the system will assume landing mode. As the thrust levers are
advanced, the system will schedule prepressure mode.
Typical Flight Pressurization Profile (Aircraft 5367 and Subsequent Aircraft Post SB 604−21−004)
Figure 02−10−8
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−17
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
On airplanes 5367 and subsequent and airplanes incorporating SB 604–21–004:
High-Altitude Airfield Mode
The CPC includes a high-altitude airfield mode to support aircraft operation up to a maximum
airport pressure altitude of 14,000 feet MSL.
During takeoff and landing at airport pressure altitudes above 8,000 feet, the CPC reduces
the time at which cabin altitude exceeds 8,000 feet as explained below:
Operation to a High-Altitude Airfield (Above 8,000 feet)
When a landing field elevation above 8,000 feet is selected, the CPC will schedule cabin
altitude versus aircraft altitude as follows:
• Climb Phase: After takeoff, the CPC uses 8,000 feet as the control point. With the
auto RATE knob selected at the PIP mark, the cabin rate will climb at a rate of 500
feet per minute up until it reaches 8,000 feet.
• Cruise Phase: The CPC maintains the cabin altitude at 8,000 feet.
• Landing Phase: When the aircraft is in descent and aircraft altitude is less than 25,000
feet MSL, the CPC will climb the cabin altitude to the selected landing field elevation
at an increased rate (700 feet per minute at the PIP mark). This altitude is maintained
for the remainder of the flight.
Takeoff at Sea Level to Land at 14,000 feet
Figure 02−10−9
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−18
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Operation from a High-Altitude Airport (Above 8,000 feet)
When departing from an airport above 8,000 feet, the CPC will schedule cabin altitude versus
aircraft altitude as follows:
• Climb Phase: After takeoff, the CPC immediately sets the cabin altitude control point
to 8,000 feet and descends the cabin altitude at an increased rate (600 feet per
minute with the auto RATE knob selected at the PIP mark) until it reaches 8,000 feet.
• Cruise Phase: The cabin altitude remains at 8,000 feet until the aircraft is established
in cruise. The CPC then controls the cabin altitude toward the autoschedule control
point at the selected rate.
Takeoff at 14,000 feet to Land at Sea Level
Figure 02−10−10
Operation From and To a High−Altitude Airport (Above 8,000 feet)
For operation from and to airfields above 8,000 feet, the cabin altitude profile can be obtained
by combining Figure 2–9 and Figure 2–10.
Manual Pressurization Mode
When MANUAL is selected on the CABIN PRESSURIZATION control panel, the outflow valves
are manually controlled. The MAN ALT lever and the MAN RATE knob on the CABIN
PRESSURIZATION control panel are used to position the outflow valves. An UP selection on
the MAN ALT lever will cause an increase in cabin altitude at the rate selected on the MAN
RATE knob. A DN selection of the MAN ALT lever will cause the cabin altitude to decrease at
the rate set by the MAN RATE knob. When the MAN ALT lever is released, it is spring-loaded to
the neutral position and the cabin altitude will be maintained regardless of changes to the
aircraft altitude.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−19
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
When manual pressurization is selected, pressurization data is reproduced on the EICAS
primary page.
CONTROLS AND INDICATORS
General
The air conditioning panel is located on the overhead panel, and has separate cockpit and cabin
controls that can be operated in normal, standby and manual modes.
Warning, caution, advisory and status messages are presented on the engine indication and crew
　
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