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EMERG
DEPRESS
ON
EMER DEPRESS
L-R PACK OFF
GX_13_068
14,800
7.74
5000
1000
CAB ALT
CAB RATE
LDG ELEV
P
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
CABIN ALT
GX_13_069
15,000
0.00
3000
1000
CAB ALT
CAB RATE
LDG ELEV
P
For Training Purposes Only
Sept 04
13-59
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
OUTFLOW VALVE TRAVEL LIMITER
An OFV travel limiter device is included on each OFV to limit the OFV opening (for
differential pressure higher than 7 ± 0.5 psid) to a safe value (maximum 50%) at high
altitudes.
When the pressure differential is above 7 ± 0.5 psid, the travel limiter device prevents
the OFV opening beyond 50%. The travel limiter will not prevent movement from
open to close.
CLOSE OUTFLOW VALVE
The OFVs can be manually closed, both in AUTO and MAN, by selecting the
OUTFLOW VLV switch(es) on the Cabin Pressure Control Panel. The OFV is driven
to the closed position through the manual drive of its actuator. The outflow valves’
position will be displayed on the STATUS page and a message is displayed on the
EICAS.
AUTOMATIC DITCHING SEQUENCE
Safety in case of ditching is achieved in both AUTO and MAN modes, ensuring that
the cabin is fully depressurized and that the outflow valves are fully closed.
The AUTO sequence is generated from the DITCHING switch selection and the
following occurs:
• PACKS flow shutoff
• Cabin is depressurized
• OFVs are driven to the closed position
The AUTO ditching sequence is inhibited above 15,000 feet. The altitude rate
limitation is inoperative whenever DITCHING is selected ON.
GX_13_070
6500
7.74
500
1000
CAB ALT
CAB RATE
LDG ELEV
P
50% 50%
OPEN OPEN
OUTFLOW VALVES
1 2
OUTFLOW VALVE
1
CLOSED
2
CLOSED
OUTFLOW VLV 1 CLSD
GX_13_071
0% 13%
OPEN OPEN
OUTFLOW VALVES
1 2
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-60 For Training Purposes Only
Sept 04
When the DITCHING switch is selected ON, the OFVs are displayed on the STAT
page and status messages are displayed on the EICAS.
MANUAL DITCHING SEQUENCE
The MAN sequence is generated manually by the following selections:
• Select PACKS OFF
• Select EMER DEPRESS ON
• Select both OFVs CLOSED
SAFETY VALVES
The two safety valves (SFV 1 and SFV 2) are located in the aft bulkhead.
Each SFV ensures overpressure and negative pressure relief, and provides an OPEN
position signal to the EICAS.
DITCHING
ON DITCHING ON
L-R PACK OFF
OUTFLOW VLV 1-2 CLSD
GX_13_072
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
OUTFLOW VALVE
1
CLOSED
2
CLOSED
EMERG
DEPRESS
ON
EMER DEPRESS
L-R PACK OFF
OUTFLOW VLV 1-2 CLSD
GX_13_073
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
R PACK
FAIL
OFF
L PACK
FAIL
OFF
SAFETY VALVE OPEN
GX_13_074
For Training Purposes Only
Sept 04
13-61
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
SYSTEM SAFETIES
The system safety features incorporated in the CPCS are:
• Dual redundant positive and negative pressure relief valves
• Dual (segregated) cabin altitude limiters, each dedicated to one outflow valve
(OFV)
• An OFV travel limiter on each OFV
• Automatic Ditching provision
• Emergency Depressurization provision
• Dual OFV closure override circuitry
• Door Open Protection
OVERPRESSURE RELIEF
Overpressure relief is ensured pneumatically by each identical SFV and overrides the
operation of both the AUTO and MAN mode. When maximum differential pressure is
reached, an overpressure valve located on the safety valve, opens to outside pressure.
The differential pressure shall not exceed 0.1 psi during taxi and 1.0 psi upon initial
landing. The maximum positive differential pressure is controlled at 10.02 ± 0.1 psi.
At 9.92 + 0.1 psi, the safety valve opens At 10.02 psi CABIN DELTA P will be
displayed on the EICAS and the digital readout on the STAT page will appear red.
NEGATIVE PRESSURE RELIEF
Negative pressure relief is ensured pneumatically by each identical SFV and overrides
the operation of both the AUTO and MAN mode. During an emergency descent
without cabin airflow, when the outside pressure becomes slightly greater than cabin
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