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EICAS PHILOSOPHY
The following represents the EICAS symbols and logic for the BLEED and AIR CONDITIONING
synoptic pages. The symbols are shown in serviceable and failure conditions.
GF0210_084
BLEED and AIR CONDITIONING LOGIC
VALVE AND FLOW LINE
OPEN
VALVE
NOT FAILED
CLOSED
TRANSIT
INVALID
VALVE
FAILED
DIRECTION OF FLOW
PACKS
OPERATING OPERATING FAILED INVALID
NOT
LP
HP
BLEED AIR STARTER
POP−UP DISPLAY
and SAV
EITHER ENGINE NOT OPERATING
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−65
BLEED/AIR CONDITIONING/PRESSURIZATION EICAS MESSAGES
CABIN ALT
Indicates that cabin altitude
is 9,000 feet or greater.
AUTO PRESS FAIL
Indicates that both channels
of the pressurization control
are inoperative.
L (R) PACK TEMP
Indicates that the manual
temperature selection is out
of range.
CABIN ALT
Indicates that cabin altitude is
between 8,200 and 9,000 feet.
CABIN DELTA P
Indicates that cabin differential
pressure is greater than 10.85 psid.
EMER DEPRESS
Indicates that EMERG DEPRESS
switch has been selected ON.
L (R) BLEED LEAK
Indicates that a bleed leak has been
detected in the L or R bleed ducts.
L (R) PACK AUTO FAIL
Indicates that the affected automatic
pack control is inoperative.
TRIM AIR LEAK
Indicates that a leak has been
detected in the trim air ducts.
XBLEED FAIL
Indicates that the bleed
crossfeed has failed, open
or closed.
L (R) BLEED SYS FAIL
Indicates that the affected bleed
system has failed.
GF0210_085c
CABIN ALT
CABIN DELTA P
AUTO PRESS FAIL
CABIN ALT
EMER DEPRESS
L BLEED LEAK
R BLEED LEAK
L BLEED SYS FAIL
R BLEED SYS FAIL
L PACK AUTO FAIL
R PACK AUTO FAIL
L PACK FAIL
R PACK FAIL
L PACK TEMP
R PACK TEMP
TRIM AIR FAIL
TRIM AIR LEAK
L (R) PACK FAIL
Indicates that the
affected pack
WING A/ICE LEAK
has failed.
XBLEED FAIL
WING A/ICE LEAK
Bleed leak detected
in wing A/I duct.
TRIM AIR FAIL
Indicates that one
trim air valve and
one hot air SOV
are failed.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−66
BLEED/AIR CONDITIONING/PRESSURIZATION EICAS MESSAGES (CONT'D)
Effectivity:
• Airplanes 9002 thru 9158 not incorporating Service Bulletin:
• SB 700−21−034, Modification − Pressurization Control − Cabin Altitude Reduction During
Flight for Improved Passenger Comfort.
CABIN ALT
Indicates that cabin altitude
is 9,000 feet or greater.
AUTO PRESS FAIL
Indicates that both channels
of the pressurization control
are inoperative.
L (R) PACK TEMP
Indicates that the manual
temperature selection is out
of range.
CABIN ALT
Indicates that cabin altitude is
between 8,200 and 9,000 feet.
CABIN DELTA P
Indicates that cabin differential
pressure is greater than 10.15 psid.
EMER DEPRESS
Indicates that EMERG DEPRESS
switch has been selected ON.
L (R) BLEED LEAK
Indicates that a bleed leak has been
detected in the L or R bleed ducts.
L (R) PACK AUTO FAIL
Indicates that the affected automatic
pack control is inoperative.
TRIM AIR LEAK
Indicates that a leak has been
detected in the trim air ducts.
XBLEED FAIL
Indicates that the bleed
crossfeed has failed, open
or closed.
L (R) BLEED SYS FAIL
Indicates that the affected bleed
system has failed.
GF0210_085b
CABIN ALT
CABIN DELTA P
AUTO PRESS FAIL
CABIN ALT
EMER DEPRESS
L BLEED LEAK
R BLEED LEAK
L BLEED SYS FAIL
R BLEED SYS FAIL
L PACK AUTO FAIL
R PACK AUTO FAIL
L PACK FAIL
R PACK FAIL
L PACK TEMP
R PACK TEMP
TRIM AIR FAIL
TRIM AIR LEAK
L (R) PACK FAIL
Indicates that the
affected pack
WING A/ICE LEAK
has failed.
XBLEED FAIL
WING A/ICE LEAK
Bleed leak detected
in wing A/I duct.
TRIM AIR FAIL
Indicates that one
trim air valve and
one hot air SOV
are failed.
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−67
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