BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 358

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.
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.
12-8 CL 601-3R
CL-600-2B16 PILOT TRAINING MANUAL
EMERGENCY
DEPRESSURIZATION
GENERAL
An emergency depressurization system is
available to provide rapid decompression
of the airplane when an emergency such as
air contamination, cabin fire, or failure of
the maximum differential control occurs
(other situations may also require emer-
gency depressurization).
CONTROL
The emergency depressurization system is
controlled by a guarded switchlight on the
pressurization control panel (Figure 12-1) la-
beled "EMER DEPRESS." When pushed, an
amber ON light in the switch will illuminate,
and battery bus voltage will be applied to the
electropneumatic (left) outflow valve. Control
pressure in both outflow valves will dissipate
rapidly. Both outflow valves will open and
the cabin will depressurize very rapidly. (At
13,000 ±500 feet the altitude limiter will take
over to prevent further cabin climb as long as
there is a source of pressurizing air.)
CABIN ALTITUDE CONTROL
Cabin altitude and rate-of-change controls are
available through either the automatic selec-
tor in the automatic mode or through the
MANual REGulator in the manual mode.
FOR TRAINING PURPOSES ONLY
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