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illumination of an amber light (referred to as the motor power indicator)
above the AUTO/MANUAL switch and display of an amber CABIN PRES
MANUAL caution message on CAS.
The outflow valve may then be controlled by the flight crew, using its DC
motor, by means of a knob on the CABIN PRESSURE CONTROL panel.
The knob is spring-loaded to return the vertical position, labeled MAN
HOLD, when released. Rotating the knob toward OPEN drives the valve
open; rotating the knob toward CLOSE drives the valve closed.
The manual control knob circuit is designed such that the further the knob
is moved away from MAN HOLD toward OPEN or CLOSE, the more pulses
are applied to the motor, i.e., the faster the valve moves in that direction.
The amber motor power indicator above the AUTO/MANUAL switch will
blink in proportion to the speed of the pulses applied to the motor.
Valve position is shown by an indicator to the right of the control knob. The
indicator displays outflow valve position at all times, whether in AUTO or
MANUAL modes of operation. When desired valve position is attained,
releasing the knob will return the knob to MAN HOLD and the outflow valve
will hold (stop) in that position.
To return system to automatic mode, the AUTO/MANUAL switch is selected
to AUTO. The annunciations will be extinguished and the MAN HOLD knob
function will become inoperative.
NOTE:
On aircraft having ASC 295 incorporated, loss of AC
power will automatically switch the pressurization
system to MANUAL control. This causes the MANUAL
switch legend to illuminate amber, the illumination of
an amber motor power indicator above the AUTO/
MANUAL switch and display of an amber CABIN
PRES MANUAL caution message on CAS.
C. Cabin Pressure Safety Valve Limiting Mode:
Should the AUTO or MANUAL control mode of the pressurization system
malfunction and cabin pressure builds up to approximately 9.7 ±0.1 psid,
the safety valve will open. It then modulates to limit cabin pressure to the
safety relief pressure of 9.8 psid.
D. Depressurization Rate Limiting Mode:
Depressurization rate limiting prevents excessive rates of pressure loss, as
might occur, for instance, if a malfunction drives the outflow valve to the full
open position. Detection of an excessive rate of pressure loss triggers the
cabin rate pressure switch, in turn causing the outflow valve to be driven
fully closed and automatic control of the system is inhibited. The MANUAL
legend of the AUTO/MANUAL switch illuminates amber and an amber
CABIN PRES MANUAL caution message is displayed on CAS.
The flight crew can restore the system to automatic operation after
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-21-00
Page 7
May 30/02
Revision 7
depressurization rate limiting by first hard-selecting the AUTO/MANUAL
switch to MANUAL, enabling normal manual control. Reset is then
completed by hard-selecting the AUTO/MANUAL switch to AUTO.
E. Pressurization System Check:
The flight crew normally performs the following pressurization system
check in the course of their normal procedures:
(1) Ensure the main entrance door is open.
(2) Configure APU BLEED AIR, L ENG BLEED AIR and R ENG BLEED
AIR as required.
(3) Select the FLIGHT/LANDING switch to LANDING (green).
(4) Select the AUTO/MANUAL switch to AUTO (green).
(5) Select the ADC #1/ADC #2 switch to ADC #1 (green).
(6) Verify the outflow valve is OPEN on the position indicator. Perform
system check as follows:
(7) Select the FLIGHT/LANDING switch to FLIGHT (green).
(8) Verify the outflow valve is driving toward CLOSE. At the midway
point:
(9) Select the ADC #1/ADC #2 switch to ADC #2 (amber).
(10) Verify the outflow valve drives fully to CLOSE.
(11) Select the FLIGHT/LANDING switch to LANDING (green).
(12) Verify the outflow valve is driving toward OPEN. At the midway
point:
(13) Select the ADC #1/ADC #2 switch to ADC #1 (green).
(14) Verify the outflow valve drives further toward OPEN. Before the
valve reaches fully OPEN:
(15) Select the AUTO/MANUAL switch to MANUAL (amber). Verify
amber “cabin pressure manual” light illuminates.
(16) Verify manual control of outflow valve to OPEN and CLOSE
positions using the manual control knob.
(17) Select the AUTO/MANUAL switch to AUTO (green).
(18) Verify the outflow valve drives fully OPEN if not already fully OPEN.
Set final configuration as follows:
(19) Select the FLIGHT/LANDING switch to LANDING (green).
(20) Select the AUTO/MANUAL switch to AUTO (green).
(21) Select the ADC #1/ADC #2 switch to ADC #1 (green).
(22) Verify the outflow valve is OPEN on the position indicator.
　
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