Flight Mode - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

ASSOCIATED SYSTEM
(GROUND MODE)
A ground pressurization control mode is in-
corporated and is identified as an associated
system which is operational only on the ground
in the automatic mode.
GROUND OPERATION
(BEFORE TAKEOFF)
The pressurization system may be programmed
prior to engine starting if electrical power is
available and the MODE selector switch is in
the AUTOmatic position. The cabin will not
normally pressurize even if both air condi-
tioners are selected "ON" because the WOW
(weight-on-wheels) system is in the ground
mode and the automatic selector controls the
left outflow valve, causing both valves to go
to the full open position. This condition will
prevail until the thrust levers are advanced
beyond the 35° thrust lever quadrant position
which equates to approximately 80% N1 rpm.
Then the automatic selector will signal the
left outflow valve to close (the right outflow
valve is slaved to the left and will also close),
and a predetermined cabin pressure buildup (at
a controlled rate) will occur. This tends to
e l i m i n a t e p r e s s u r e s u rg e s a f t e r l i f t - o ff .
Following lift-off, the WOW system will go
to the flight mode and normal pressurization
scheduling will begin.
GROUND OPERATION
(LANDING)
Normal pressurization scheduling for landing
i s f i e l d e l eva t i o n m i n u s 2 0 0 – 3 0 0 f e e t .
Therefore, the airplane lands slightly pres-
surized. When the WOW system goes to the
ground mode, the automatic selector sched-
ules outflow valve opening at the selected
rate of depressurization.
12-6 CL 601-3R
CL-600-2B16 PILOT TRAINING MANUAL

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.
FOR TRAINING PURPOSES ONLY
FlightSafety Canada L t é e
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