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L or R ENG BLEED SNSR status (white)
Indicates respective pack inlet pressure
sensor has failed.
ISOL CLOSED status (white)
Indicates that bleed isolation
shut--off valve is fully closed.
Primary Page
Status Page
Vol. 1 19--20--5
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
D. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Bleed Air Shut-Off
L BLEED SOV DC
2
S10
Shut Valves R BLEED SOV
ESSENTIAL S11
Vol. 1 19--20--6
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 19--30--1
PNEUMATIC
Bleed Air Leak Detection REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. BLEED AIR LEAK DETECTION
The bleed air leak detection system monitors the pneumatic and anti-ice ducting for high
temperatures associated with bleed air leakage. EICAS messages and system control is
provided by an anti-ice and leak detection controller (AILC).
The bleed leak detection consists of continuous sensing loops routed in parallel along the
pneumatic ducting. The system is divided into five zones and each zone can be isolated by
means of a shut-off valve. The five zones are left and right bleed zone, left and right cowl
anti-ice zones and wing anti-ice zone. The wing anti-ice zone is subdivided into four loops.
They are left and right fuselage loops and left and right wing loops. The supply ducting is
encased in a protective cover. If a leak occurs, holes in the protective cover directs the hot
bleed air towards the sensing loops.
The dual sensing loops are used to ensure dispatch reliability and to minimize system false
warnings. To prevent false indications, both loops must detect a leak before an EICAS
message is posted. The leak detection sensing loops consists of two wires mounted
coaxially inside a flexible metal tube. The ends of each sensing loop are connected to the
controller. When hot air escapes from a leak in the ducting it is sensed by the controller
which posts a EICAS message identifying the leakage zone. The duct is then isolated by
closing the appropriate shut-off valve.
For normal wing anti--icing, hot bleed air from the supply ducting is released through piccolo
tubes to heat the wing leading edges. The dual loops and a skin temperature sensor
located in the wing leading edge are used to detect failures in the wing anti-ice ducting.
The cowl anti-ice ducts, located in the engine pylons, consist of inner and outer ducts.
Bleed air for anti-icing travels through the inner the duct. The area between the inner and
outer duct is monitored by a pressure transducer. In the event of a failure or crack of the
inner duct, the pressure transducer will sense the air pressure change and send a signal to
the AILC to post an EICAS warning message.
Vol. 1 19--30--2
PNEUMATIC
Bleed Air Leak Detection REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
Bleed Air Leak Detection System
Figure 19---30---1
ENGINE
FIREWALL
APU FIREWALL
LEFT
BLEED
ZONE
LEFT
COWL
WING
ENGINE
FIREWALL
RIGHT
BLEED
ZONE
RIGHT
COWL
LOOP
DUCT
LEGEND
WING ANTI--ICE
CROSS BLEED
VALVE
RIGHT
WING
ANTI--ICE
VALVE
LEFT
WING
ANTI--ICE
VALVE
RIGHT
COWL
ANTI--ICE
VALVE
LEFT
COWL
ANTI--ICE
VALVE
RIGHT
ENG
PRSOV
LEFT
ENG
PRSOV
HIGH
PRESSURE
GROUND
CONNECTION
RIGHT
PACK
FLOW
CONTROL
VALVE
LEFT
PACK
FLOW
CONTROL
VALVE
BLEED
ISOLATION
VALVE
Vol. 1 19--30--3
PNEUMATIC
Bleed Air Leak Detection Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Bleed Air Leak Detection Anti---Ice --- Duct EICAS Indications <1001>
Figure 19---30---2
ANTI--ICE DUCT
L BLEED DUCT
R BLEED DUCT
L COWL A/I DUCT
R COWL A/I DUCT
ANTI--ICE DUCT
L BLEED DUCT
R BLEED DUCT
ANTI--ICE DUCT warning (red)
Indicates that a bleed air leak has
been detected by the anti--ice and leak
detection controller in the wing anti--ice
ducting or piccolo tubes.
ANTI--ICE
DUCT
L or R COWL A/I DUCT warning (red)
Indicates that the respective cowl
anti--ice duct pressure is above
17 psig or a bleed air leak has been
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