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cabin and flight compartment. This switch/light is only used if both
air conditioning units fail.
(5) Emergency Air Ventilation Switch/light
The emergency air ventilation switch/light, RAM AIR VENT, is used to
open a normally closed emergency ram air shutoff valve. When the
switch/light is operated, the shutoff valve opens to permit the entry
of ram air, at ambient temperature, into the left conditioned air
duct. This supplies air to both the cabin and flight compartment.
This switch/light is used only if both air conditioning units fail.
SECTION 2
Page 14
Mar 01/85
canadair
chanenqer
OPERATING MANUAL
PSP 606
RATE SELECTOR
Used to select rate of change of cabin pressure
between ±175 and ±2500 feet per minute.
Detent at centre position corresponds to
500 feet per minute.
CABIN PRESS LOW WARNING LIGHT
Amber CABIN PRESS LOW light comes on if
cabin altitude increases above 10,000 feet.
ALT SELECTOR
Used to select cabin altitude between—1000
and 10,000 feet or the corresponding
maximum flight altitude.
SELECTOR INDICATOR
Indicates selected cabin altitude, cabin
pressure rate, and barometric pressure.
MODE SELECTOR SWITCH
Used to select mode of control for cabin
pressurization control system.
BARO SET SELECTOR
Used to select barometric setting between 29
and 31 inches of mercury.
MANUAL REGULATOR
Rotary switch provides manual control of
cabin pressurization if automatic control fails.
Cabin Pressurization Control Panel
Figure 6 (Sheet 1)
SECTION 2
Page 15
Mar 01/85
canaaair
chauentjer
OPERATING MANUAL
PSP 606
® CABIN PRESSUR1ZATION ®
EMER ® RAM EMER
DEPRESS AIR VENT PRESSN
EMER DEPRESS SWITCH/LIGHT
When pressed in, amber light comes on and
both outflow valves open to depressurize the
aircraft in an emergency.
When pressed in, white light comes on and ram
air at ambient temperature enters to supply air
to the flight compartment and cabin in an
emergency.
EMER PRESSN SWITCH/LIGHT
When pressed in, amber light comes on and
warm air from the footwarmer and demist
system enters to pressurize the aircraft in
an emergency.
Cabin Pressurization Control Panel SECTION 2
Figure 6 (Sheet 2) Page 16
Mar 01/85
OPERATING MANUAL
PSP 606
(6) Low Pressure Warning Light
The automatic selector contains a pressure switch that is set to
operate when the cabin altitude increases above 10,000 feet. If this
happens, the CABIN PRESS LOW light on the cabin pressurization control
panel comes on, the ENV CONT light on the 10-channel annunciator panel
comes on and the master caution lights come on and flash.
Ground Control Subsystem
A ground control subsystem in the automatic selector pressurizes the cabin
at the selected rate whenever a weight-on-wheels signal is present and
either of the throttles is advanced beyond 62% of its maximum travel (80%
Nl rpm, approximately). The purpose of the subsystem is to pre-pressurize
the cabin during the take-off roll, thus avoiding cabin pressure surges
immediately after take-off.
Safety Relief Systems
The system is designed to limit the maximum cabin differential pressure to
9.35 psi regardless of the cabin altitude setting on the cabin
pressurization control panel.
Negative pressure relief is an automatic function of the outflow valves and
starts whenever the ambient pressure exceeds the cabin pressure by more
than 0.25 psi. If the pressure differential continues to increase, the
outflow valves open sufficiently to limit the negative differential to
-0.5 psi.
Cabin Altitude Limiters
Each of the outflow valves contains an altitude limiter in the form of an
aneroid device that operates to close the valve if an increasing cabin
altitude cannot be controlled or if emergency pressurization is selected.
Each aneroid device detects the absolute cabin pressure and, if the cabin
altitude increases to 12,500 +1,000 feet, admits cabin pressure into the
outflow valve diaphragm chamber to force the valve closed.
Automatic Operation
Prior to take-off, the system is prepared for automatic operation by
setting the MODE switch to AUTO and turning the MAN REG selector clockwise
to the full down (DN) position. The desired rate of cabin climb, the
take-off field barometric pressure and the cabin altitude desired for
cruise are then set using the RATE, BARO SET and ALT controls on the
automatic selector.
SECTION 2
Page 17
Mar 01/85
canadair
chanencjer
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