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hot bleed air towards the sensing loops.
For normal wing anti--icing, hot bleed air from the 14th stage supply ducting is released
through piccolo tubes to heat the wing leading edges. Thermal switches in the leading edge
of each wing are used to detect leaks in the wing leading edge anti-ice ducting.
REV 56, Jan 31/03
Vol. 1 19--30--2
PNEUMATIC
Bleed Air Leak Detection
Flight Crew Operating Manual MASTER
CSP A--013
Bleed Air Leak Detection and Warning System
Figure 19---30---1
SENSING ELEMENTS
RIGHT 10TH
STAGE MANIFOLD
SENSING ELEMENTS
LEFT 10TH
STAGE MANIFOLD
FWD
SENSOR ELEMENTS
RIGHT 14TH
STAGE MANIFOLD
SENSING ELEMENTS
LEFT 10TH
STAGE MANIFOLD
SENSING ELEMENT
RIGHT FUSELAGE
SENSING ELEMENT
LEFT FUSELAGE
SENSING ELEMENT
LEFT 14TH
STAGE MANIFOLD
SENSING ELEMENT
DUCT
Duct removed for clarity
NOTE
BLEED AIR LEAK
CONTROL UNIT
SENSING
ELEMENT
SENSING
ELEMENT
SENSING
ELEMENT
Vol. 1 19--30--3
REV 56, Jan 31/03
PNEUMATIC
Bleed Air Leak Detection
Flight Crew Operating Manual
CSP A--013
MASTER
Bleed Air System Control Panel
Figure 19---30---2
Bleed Air Panel
Overhead Panel
Monitor Selector Switch
Used to check serviceability of detector loops in left and right sections of 10th and 14th stage systems.
TEST -- Tests 10th/14th stage loops by grounding loop to simulate a duct failure.
LOOP A -- Tests Loop A of 10th stage for continuity, to ensure that loop is not shorted to ground.
LOOP B -- Tests Loop B of 10th stage for continuity, to ensure that loop is not shorted to ground.
NORM -- Normal switch position. Leak detection on Loops A and B is provided.
REV 56, Jan 31/03
Vol. 1 19--30--4
PNEUMATIC
Bleed Air Leak Detection
Flight Crew Operating Manual MASTER
CSP A--013
Bleed Air Leak Detection --- Loop EICAS Indications <MST>
Figure 19---30---3
Status Page
<0039>
<0039>
DUCT TEST O.K. advisory (green)
Comes on to indicate that corresponding
loop test is successful (all 5 duct warnings
will be displayed).
DUCT MON LOOP A/B status (white)
Comes on to indicate that corresponding
loop is under test.
L/R 10TH DUCT warning (red)
Comes on if temperature sensors
detect failure in 10th stage duct
segment. Corresponds to DUCT
FAIL L/R switch/light (red) on
BLEED AIR panel.
Primary Page
<0039> <0006>
L 10TH DUCT
R 10TH DUCT
L 14TH DUCT
R 14TH DUCT
ANTI--ICE DUCT
BLEED
AIR
DUCT
L/R 14TH DUCT warning (red)
Comes on if temperature sensors
detect failure in 14th stage duct
segment. Corresponds to DUCT
FAIL L/R switch/light (red) on
BLEED AIR panel.
BLEED
AIR
DUCT
ANTI--ICE DUCT warning (red)
Comes on when bleed air leak is
detected in left and/or right
fuselage or wing anti--ice ducts.
Accompanied by voice alest:
ANTI--ICE
DUCT
DUCT TEST OK
DUCT MON LOOPA
DUCT MON LOOP B
Vol. 1 19--30--5
REV 56, Jan 31/03
PNEUMATIC
Bleed Air Leak Detection
Flight Crew Operating Manual
CSP A--013
MASTER
A. SYSTEM CIRCUIT BREAKERS
SYSTEM SUB--SYST CB NAME BUS BAR CB PANEL LOCATION NOTES
Bleed Air
Bleed Leak
BLEED
LEAK TEST
DC ESS 4 B2
System
Detection
CONT L AC ESS 3 B1
CONT R B2
REV 56, Jan 31/03
Vol. 1 19--30--6
PNEUMATIC
Bleed Air Leak Detection
Flight Crew Operating Manual MASTER
CSP A--013
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