CAE SimuFlite Citation Bravo, Pilot Training Manual

Page: 677 / 718

Pneumatic Systems
Citation Bravo
Developed for Training Purposes
5K-23
September 2005
Pressurization Controller
The pressurization controller
(Figure
5K-11
) is comprised of two digital
windows marked SET ALT and
RATE, an FL button, an EXER but-
ton and a SET ALT knob. The con-
troller is normally operated in the
AUTO mode, which is selected by
positioning the MANUAL/AUTO
switch on the pressurization-environ-
mental control panel to AUTO. In
AUTO mode the pilot normally
selects the landing field pressure alti-
tude before takeoff by setting the
information into the upper window
with the SET ALT knob. Then, in
flight the controller will continuously
generate an auto-schedule based on
the departure field elevation, the
maximum altitude in flight sensed by
the micro air data computer, and any
later operator changes of the landing
field pressure altitude. The controller
determines the pressure rate of
change and the cabin pressure alti-
tude based on the auto-schedule and
the air data sensor indicated altitude.
The auto-schedule will have the
cabin depressurized by an altitude of
1,500 ± 200 feet, above the set desti-
nation field elevation before landing.
Cabin rate-of-change is an automatic
function of the system and is not
directly selectable.
If the air data sensor information is
interrupted, or other system failure
should cause the AUTO mode to fail,
the controller will switch the system
to isobaric mode of control. A yellow
warning indicator on the display face
will illuminate to advise of the
change. The landing field altitude on
the con-troller display will then switch
to the selected flight level, which will
allow the operator to set the desired
airplane cruising flight level in order
to continue to cause automatic control
of the cabin pressure rate of change
and the cabin altitude. A near maxi-
mum cabin differential pressure will
be maintained.
In isobaric control the operator may
recall the selected landing field alti-
tude by pressing the FL (flight level)
button on the controller, and the select-
ed flight level on the controller display
will be replaced by landing field alti-
tude annunciated as CA (cabin alti-
tude). Further pushes of the FL button
will cycle the display between Flight
Level (FL) and Cabin Altitude (CA).
Cabin altitude function can be selected
to set cabin altitude prior to landing. If
air data sensor information is restored
the controller will automatically
switch back to AUTO mode and the
yellow warning indication will be
extinguished.
5K-10 5K-11