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Cruise Flight Level 350 370 390 410 430 450 470 490 510
Target Cabin Altitude 3756 4106 4514 4996 5518 6000 6444 6853 7229
Target ΔP 9.35 9.50 9.60 9.64 9.64 9.64 9.64 9.64 9.64
GX_13_061
10% 10%
OPEN OPEN
OUTFLOW VALVES
1 2
UP
DN
MMAANNAALLTT
UP
DN
D
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-56 For Training Purposes Only
Sept 04
LANDING ELEVATION
Landing elevation information is transmitted by the FMS or from the manual selection
on the Pressurization Control Panel. The value used for pressurization control by the
CPCs is displayed on the STAT page.
When the LDG ELEV FMS/MAN selector is set to FMS, and the landing destination
information has been programmed in the FMS, and the flight plan activated, the LDG
ELEV is displayed on the STAT page.
When the LDG ELEV FMS/MAN selector is set to MAN, the LDG ELEV selection is
made from the Pressurization Control Panel. The LDG ELEV is defaulted to 0 feet on
the ground and 7,230 feet in flight. A message is displayed on the EICAS and will
remain posted until a selection of UP or DN.
1300
0.00
300
1000
CAB ALT
CAB RATE
LDG ELEV
P
LDG ELEV
Digital readout in
10 foot increments.
GX_13_062
COMPARE FUEL QUANTITY
0DEPARTURE PERF INIT0
000ACTIVE FLT PLAN 1/4
0BOW DEST0
0K0P0H0X0001152Z CYUL
0ORIGIN
LDG ELEV
MAN
FMS
UP
F DN
1300
0.00
300
120
CAB ALT
CAB RATE
LDG ELEV
P
GX_13_063
For Training Purposes Only
Sept 04
13-57
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
To enter a new LDG ELEV, hold the UP/DN switch until desired field elevation is
reached.
RATE LIMIT SELECTION
Cabin rate of change control is automatically controlled during ground and flight
sequences. The airplane is normally flown with the rate limit selector set to NORM
position. The automatic rate of change control is based upon + 500 ft/min and - 300 ft/
min. The airplane cabin altitude rate will vary within these normal limits, to follow the
pressurization schedule. The cabin rate is displayed on the STAT page. If the cabin is
in a climb, the arrow will indicate up. If the cabin is in descent, the arrow will indicate
down.
It is possible to manually override the automatic rate of change control limits through
the rate limit selection on the Pressurization Control Panel. In the HIGH position, the
rate limits are set to 0 to 800 ft/min descent. The cabin rate will vary between these
two limits as required to maintain the pressurization schedule.
SET LDG ELEV
LDG ELEV
MAN
FMS
UP
DN
LD
M
1300
0.00
300
7230
CAB ALT
CAB RATE
LDG ELEV
P
GX_13_064
LDG ELEV
MAN
FMS
UP
DN
LD
M
GX_13_065
1300
0.00
300
120
CAB ALT
CAB RATE
LDG ELEV
P
RATE
HIGH
NORM
1300
0.04
300
1000
CAB ALT
CAB RATE
LDG ELEV NORM:
500 fpm up, 300 fpm down.
GX_13_066
N
P
HIGH:
800 fpm down.
3600
1.02
800
200
CAB ALT
CAB RATE
LDG ELEV
P
GX_13_067
RATE
HIGH
NORM
ATE
H
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-58 For Training Purposes Only
Sept 04
EMERGENCY DEPRESSURIZATION
When the EMER DEPRESS switch is selected ON, a fast depressurization is
performed in AUTO or MAN mode by opening both OFVs through the manual drive
of the OFVs.
Cabin altitude limitation functions override this function and will not allow the cabin
altitude above 14,500 ± 500 feet. The cabin rate of climb limitation is inoperative.
CABIN ALTITUDE LIMITATION
The cabin altitude limiters override the operation of both the AUTO and MAN mode.
Two cabin altitude limiters are provided, one for each OFV. When the cabin altitude
reaches 14,500 ± 500 feet, the cabin altitude limiter signal is active.
This signal isolates the automatic and manual control of the OFVs, and closes the
OFVs through the manual channel of the OFV until the cabin altitude drops below
14,500 ± 500 feet.
The cabin altitude limitation function includes a cabin rate limitation of 3,000 ft/min to
close the OFV when the cabin altitude rate exceeds the setting value. The altitude rate
limitation is not active in the case of Emergency Depressurization and Ditching.
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