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built-in altitude sensing aneroid automatically deflates the harness assembly
(tightest setting), before cabin altitude reaches 15,000 feet.
CREW MASKS
(Puritan-Bennett)
Figure 6-10
F40-06000-009-01
Pilot’s Manual
6-28 PM-132A
PRESSURIZATION SYSTEM
Cabin pressurization is provided by conditioned air entering the cabin
through the air distribution ducts and controlled by modulating the
amount of air exhausted from the cabin. The Cabin Pressure Control
System (CPCS) regulates the exhausted air at a rate that sets the cabin
altitude.
CABIN PRESSURE CONTROL SYSTEM (CPCS)
The dual channel CPCS consists of a primary outflow valve, secondary
outflow valve, jet pump, air filter, check valve and Cabin Pressurization
Controller (CPC). The dual channel CPCS uses a primary and secondary
channel. Both channels function the same and are capable of performing
all operations required for automatic cabin pressurization.
The primary channel controls the primary outflow valve and the secondary
channel controls the secondary outflow valve. A pressurization
vacuum jet pump supplies servo pressure to both primary and secondary
outflow valves during normal pressurization. An air filter and
check valve prevent contaminated or overheated bleed air from entering
the primary outflow valve.
GROUND MODE
To prevent possible injury resulting from closing or opening the cabin
door with the aircraft partially pressurized, the outflow valves are fully
open when the CPC is in ground mode. The CPC remains in ground
mode until any of the following occurs:
- The left thrust lever is advanced for takeoff (T/O detent).
- The main gear weight-on-wheels switches indicate the aircraft
is airborne.
- Airspeed is greater than 150 knots when transitioning to climb
mode.
- Airspeed is less than 65 knots when transitioning from any
mode but climb.
CABIN PRESSURE CONTROLLER (CPC)
The CPC is located on the copilot’s PRESSURIZATION panel. This panel
provides all the necessary crew interface with the pressurization system.
The CPC contains two cabin pressure sensors (one for each
channel), a liquid crystal display, LDG ALT selector and MANUAL rate
control knobs.
Signals generated by the CPC are used to activate the altitude warning
voice, the EICAS altitude warning, the emergency pressurization system,
the oxygen system and the ACM (air cycle machine) bypass valve.
Pilot’s Manual
PM-132A 6-29
Operating power for the primary (left) and secondary (right) channels
of the cabin pressure controller is 28-vdc supplied through the 2-amp
PRI and SEC circuit breakers on the respective pilot’s and copilot’s circuit
breaker panels.
The following CAS illuminations are specific to cabin pressure controller
system:
EMERGENCY PRESSURIZATION
In the event of normal cabin airflow malfunction, emergency pressurization
is provided by routing LP bleed air directly into the cabin
through the emergency pressurization valves. The L and R BLEED
switches need to be ON for automatic or manual activation of the emergency
pressurization system to both sides. EMER PRESS can be selectively
turned off on the left or right side by turning the respective L or
R BLEED switch OFF.
Emergency pressurization is accomplished automatically by opening
the emergency pressurization valves in response to signals from the
cabin pressure controller or manually by pressing the EMER PRESS
switch on the PRESSURIZATION panel. When the aircraft is below
25,000 feet pressure altitude and the system is in automatic mode with
a takeoff or landing field elevation greater than 8000 feet specified, the
cabin pressure controller will not trigger the emergency pressurization
unless the cabin altitude increases to 14,500 (±250) feet.
CAS Color Description
CAB DELTA P Amber Cabin differential pressure limit (either positive
or negative) is exceeded.
CAB PRESS FAIL Amber Both channels (L and R) of the cabin pressurization
control system have failed. System
pressurization will go to maximum differential
pressure and cabin pressurization displays
will become amber dashes.
CAB PRESS MAN Amber Cabin pressurization has reverted to manual
rate mode because of the loss of all air data
input (dual ADC failure).
CAB PRESS FAIL White Associated channel (L or R) of the cabin
pressurization control system has failed. System
operation will automatically switch to the
opposite channel.
CAB PRESS MAN White Cabin pressurization manual rate mode is
selected by the crew.
Pilot’s Manual
6-30 PM-132A
　
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