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FLIGHT MODE
AUTOMATIC MODE
After takeoff the control logic switches into
flight mode. At this point, the controller de-
termines the proper auto-schedule altitude of
the cabin corresponding to the present air-
plane altitude. The controller also compares
the auto-schedule value with the selected land-
ing field altitude and uses the higher value as
the control value. The controller then modu-
lates the outflow valves (Figure 12-3) as re-
quired to ascend or descend the cabin toward
this control value at a rate that does not exceed
the selected rate limited.
Figure 12-4 illustrates a flight profile when
take-off field elevation is the same as desti-
nation field elevation.
12-6 CL 601-3A
CL-600-2B16 PILOT TRAINING MANUAL
MANUAL MODE
The manual mode of operation is required if
the automatic mode malfunctions or if elec-
trical power is lost. Constant monitoring of the
cabin differential pressure will be necessary
throughout the entire operation and especially
during descent and before landing.
The UP-DOWN lever is spring loaded to the
center which is an off, or closed, position.
The lever controls two poppet valves. In the
DOWN position, it opens one poppet valve to
move the outflow valve toward the CLOSED
position. In the UP position, it causes the out-
flow valve to move to a more open position.
The line to the manual outflow valve incor-
porates the rate valve, which permits the pilot
to control the rate-of-cabin pressure change
during manual operation.
The left outflow valve will respond also be-
cause it is slaved to the right (manual) valve
during manual operation.
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CAUTION
During descent, do not permit the
airplane altitude to catch up with the
cabin altitude because, at this point,
the negative pressure control will
override the operation and the cabin
will descend at the same rate as the
airplane and produce varying de-
grees of discomfort.
L t é e
L t d.
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