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In the lower right corner, the knob marked
"B" is used for setting barometric pressure.
The knob moves an arrowhead pointer across
a barometric pressure scale at the bottom of
the automatic selector.
The third knob, labeled "A," located in the
lower left corner allows the pilot to set field
elevation or altitude. The range is from –1,000
to +10,000 feet. The pilot sets takeoff or des-
tination field elevation by turning the A knob
to move a pointer to the desired position on the
scale at the top of the selector.
Having set the rate, barometric pressure, and al-
titude, the controller will then operate automat-
ically to obtain and maintain the desired or
preprogrammed pressurization level as long as the
MODE selector switch is in the AUTO position.
The MODE selector switch (Figure 12-1) has two
positions labeled "MANual" and "AUTOmatic."
The manual mode requires no electrical power
to operate. The automatic mode of operation
requires 28 VDC from the battery bus. In ad-
dition there are two fault lights (Figure 12-1).
One is labeled "AUTO FAULT" and the other
(smaller) light is labeled "FAULT." Both lights
operate in parallel. When power is initially ap-
plied to the system, the self-test is activated,
and both lights will illuminate. If they extin-
guish in 2 seconds, the system is fault free.
These two fault lights also operate in con-
junction with the ENVironmental CONTrol
annunciator (Annunciator Panel Section) and
both MASTER CAUTION lights (Annuncia-
tor Panel Section).
MANUAL REGULATOR
The MANual REGulator on the pressurization
control panel (Figure 12-1) provides a means
of manually controlling the pressurization
system when the MODE selector switch is in
the MANual mode. The MANual regulator
consists of a three-position UP-DOWN lever
and a rate selector knob with directional po-
sitions labeled "DECRease" and "INCRease."
CL-600-2B16 PILOT TRAINING MANUAL
OUTFLOW VALVES
Two outflow valves are located on the rear
pressure bulkhead to meter air from the oc-
cupied areas.
The left outflow valve is electropneumatic
and operates in response to signals from the
automatic selector when the MODE selector
switch is in the AUTO position. The right out-
flow valve is pneumatic and operates in re-
sponse to signals from the MANual REGulator.
Both outflow valves, however, are pneumati-
cally interconnected. Thus, the right outflow
valve is slaved to the left in the automatic
mode, and the left outflow valve is slaved to
the right in the manual mode. Consequently,
both outflow valves are operational in either
mode of operation. The operation of the out-
flow valves is conventional in that the meter-
ing rate increases or decreases in response to
vacuum pressure changes. The outflow valves
are spring-loaded closed, and each has an al-
titude limiter valve, and overpressure (maxi-
m u m d i f f e r e n t i a l ) r e l i e f v a l v e , a n d
negative-pressure relief capabilities.
JET PUMP
A jet pump located in the rear fuselage com-
partment is operated by air from the left 10th-
stage pneumatic manifold inboard of the left
bleed-air valve and from the right engine out-
board of the right bleed-air valve. Both sup-
plies are isolated by check valves. The control
chambers of both outflow valves are connected
to the low-pressure throat of the jet pump.
The function of the jet pump is to create a sta-
ble control vacuum pressure for operation of
the outflow valves.
In automatic operation, the control vacuum pres-
sure of the left outflow valve is varied by elec-
tronic signals from the automatic selector. In the
manual mode, operation of the manual regula-
tor will vary the pressure signals to the right
outflow valve. The control pressure in one out-
flow valve affects the metering action of both out-
flow valves because of the slaving characteristics.
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL 601-3A 12-3
Lt é e
Lt d .
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