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preset limit.
On airplanes 5301 to 5366 and airplanes not incorporating SB 604–21–004:
If cabin altitude reaches approximately 13,000 ±500 feet, the altitude limiter closes the
outflow valves to maintain the cabin altitude at 13,000 ±500 feet, provided sufficient air is
entering the cabin to maintain this level.
On airplanes 5367 and subsequent and airplanes incorporating SB 604–21–004:
The cabin altitude preset limiter is set to 14,500 ±500 feet.
Pressure Differential Diaphragms
Pressure differential diaphragms are incorporated into the cabin floor structure to prevent floor
buckling in the event of rapid decompression or emergency depressurization. The diaphragms
open to equalize floor pressure when the difference in pressure between the overfloor and
underfloor areas exceeds 3 psid.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−14
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Cabin Pressurization Panel
The automatic and manual pressurization controls are located on the overhead CABIN
PRESSURIZATION panel. Pilot input to the cabin pressure controller for automatic mode
operation is made through the cabin pressure selector which includes:
• Landing field elevation (A knob);
• Landing field barometric pressure (B knob); and
• Cabin altitude rate-of-change (R knob).
A yellow FAULT light illuminates to indicate automatic pressurization system failure.
The PRESS CONT switch/light allows selection of manual or automatic control of the
pressurization system. Cabin pressurization in manual mode is accomplished by the MAN ALT
and MAN RATE controls.
Cabin Pressurization Panel
Figure 02−10−7
Cabin Pressurization Operation
The normal operating mode is automatic, where cabin altitude is maintained at a control value
determined by the CPC from the highest of the destination airport elevation or the cabin
pressure schedule. Each flight segment has an automatic operating mode as explained below.
The alternative mode of operation is manual where the crew manually selects and controls
cabin altitude.
Ground Mode
The ground mode drives both outflow valves fully open to provide maximum ventilation on the
ground.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−15
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Prepressure Mode
The prepressurization mode is activated when thrust levers are advanced to takeoff when the
aircraft is on the ground. Prepressurizing the aircraft allows the outflow valves to achieve a
controlling position prior to takeoff. This eliminates any noticeable pressure bumps. The cabin
is pressurized between –150 to –200 feet below airfield elevation at the selected rate limit
(approximately 300 feet per minute at the PIP mark).
Takeoff Abort Mode
The takeoff abort mode is entered when the thrust levers are retarded during a rejected
takeoff. The cabin altitude climbs back to field elevation at 500 feet per minute for 20 seconds,
then the outflow valves are driven fully open. Ground mode is then re-established.
Flight Mode
Flight mode is entered when the CPC receives a weight-off-wheels signal from the PSEU. A
fixed schedule of cabin altitude versus aircraft altitude is used to establish cabin pressurization.
The CPC selects whichever is higher, selected landing field elevation or fixed schedule, as the
control value, then either maintains or drives cabin altitude toward this control value.
With the auto RATE knob selected at the PIP mark (▼), the cabin rate will climb at a rate of
500 feet per minute up, or descend at a rate of 300 feet per minute down.
Should pressure of the fuselage reduce to –0.5 psid, the outflow valves will automatically open
to equalize the pressure.
Flight Abort Mode
On airplanes 5301 to 5366 and airplanes not incorporating SB 604–21–004:
The CPC will maintain the cabin altitude at the takeoff field elevation, when that field
elevation is higher than the fixed cabin pressure schedule, until 60 seconds after the
airplane is at cruise altitude.
On airplanes 5367 and subsequent and airplanes incorporating SB 604–21–004:
The flight abort mode is set by the CPC when:
• Less than 10 minutes have elapsed since takeoff;
• Aircraft has climbed less than 6,000 feet; and
• Descent is detected by the CPC (aircraft descends by more than 1,000 feet from its
maximum altitude).
When the CPC sets the flight abort mode, it automatically drives the cabin altitude to takeoff
　
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