General; Air Sources; Major Components; Automatic Selector - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

throughout the operating envelope. Dual safety
systems limit maximum cabin pressure dif-
ferential if the normal controls fail. Additional
dual safety override controls limit cabin alti-
tude as well as negative cabin differential pres-
sure in both the automatic and manual modes.
The pilot can select emergency depressuriza-
tion if required, and he can also select an emer-
g e n c y p r e s s u r i z a t i o n s y s t e m i f n o r m a l
pressurization sources are not available.
PRESSURIZATION

GENERAL

Pressurization is divided into automatic, man-
ual, and emergency systems. The automatic
mode operates an electropneumatic outflow
valve while the manual mode, with no need for
electrical power, operates a pneumatic outflow
valve. Emergency pressurization deals only
with the source of the air pressure and can be
operated in either the automatic or manual mode.

AIR SOURCES

The source of air for normal pressurization is
the 10th-stage bleed-air manifold. The bleed
air from either engine is capable of providing
all pressurization requirements if one engine is
shut down or if other abnormalities occur. (See
12-2 CL 601-3A
CL-600-2B16 PILOT TRAINING MANUAL
Figure 12-1. Pressurization Control Panel
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
Chapter 9, "Pneumatics," and Chapter 11, "Air
Conditioning," for bleed-air operation.)
The emergency source of air pressurization is
the left engine's compressor. This air source
is available even if the left engine bleed-air
valve is completely closed.

MAJOR COMPONENTS

The major components of the pressurization
system are:

• Automatic selector

• Manual regulator
• Outflow valves
• Jet pump
AUTOMATIC SELECTOR
The automatic cabin pressure selector (Fig-
ure 12-1) is located on the overhead panel.
In the upper right corner of each selector is a
nongraduated knob labeled "R," used to set the
rate-of-cabin pressure change. The maximum
rate of change that can be set is 2,500 fpm. The
index point results in a rate-of-cabin climb
and descent of approximately 500 and 300
fpm, respectively.
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