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must detect a leak before a duct overheat warning is given.
The 14th-stage bleed air manifold and the center fuselage wing anti-icing ducts are monitored
by single-loop systems.
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
BLEED AIR LEAK DETECTION SYSTEM (CONT'D)
Thermal Switches
Thermal switches are used in the leading edges of the wings to detect uncontrolled leakage of
the anti-icing piccolo tubes. Should a piccolo tube rupture or a clamp fail, the thermal switch
closest to the leak will trigger an overheat warning.
Bleed Air Leak Detection Units
Each sensing element is connected to its respective overheat detection unit which monitors the
resistance of its loop. When the resistance decreases to the warning trip point, the bleed air leak
detection unit prompts EICAS messages as well as aural and visual warnings to alert the flight
crew of an overheat condition.
For the 10th-stage ducts, the overheat warning signal will cause the following warnings to occur:
• L (R) 10TH DUCT warning EICAS message is displayed;
• MASTER WARNING switch/lights illuminate flashing;
• “BLEED AIR DUCT” aural warning sounds; and
• Respective red DUCT FAIL light on the BLEED AIR Panel illuminates.
For the 14th-stage ducts, the overheat warning signal will cause the following warnings to occur:
• L (R) 14TH DUCT warning EICAS message is displayed;
• MASTER WARNING switch/lights illuminate flashing;
• “BLEED AIR DUCT” aural warning sounds; and
• Respective red DUCT FAIL light on the BLEED AIR Panel illuminates.
For the wing leading edge and center fuselage wing anti-icing ducts, the overheat warning
signal will cause the following warnings to occur:
• ANTI-ICE DUCT warning EICAS message is displayed;
• MASTER WARNING switch/lights illuminate flashing; and
• “ANTI-ICE DUCT” aural warning sounds.
Pressing either MASTER WARNING switch/light can silence the aural warnings. However, the
EICAS warning message will remain displayed until the condition is corrected (sensing element
or thermal switch temperature drops below the trip level).
Any bleed air leak warning requires flight crew action to manually isolate the failed section.
Unlike the engine fire detection sensing elements, the bleed air leak detection units cannot
discriminate between an actual overheat condition and a false warning (shorted loop).
DUCT MON Test
The integrity of the Bleed Air Leak Detection system can be tested via the BLEED AIR Panel.
Selecting and holding the DUCT MON selector to TEST verifies all sensing elements’ loop
continuity by simulating an overheat condition. In addition to the bleed air duct warnings that
occur during the test, successful completion will also cause the DUCT TEST OK advisory EICAS
message to be displayed.
The LOOP A and LOOP B positions are used to individually test each left and right 10th-stage
loop for a shorted condition. If the selected loop tests normal, the LOOP A TEST OK or LOOP B
TEST OK advisory EICAS message will be displayed. Should any 10th-stage loop be shorted,
the applicable bleed air duct warning will occur.
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
BLEED AIR LEAK DETECTION SYSTEM (CONT'D)
Bleed Air Leak Detection System Capabilities
Figure 18−10−5
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS
The controls (switch/lights) and the test functions for the pneumatic system are located on the
BLEED AIR Panel.
The systems advisory, caution and warning messages are displayed on the EICAS Primary and
Status Page. The 10th-stage bleed air pressure readouts are displayed on the Status Page (see
Figure 18−10−7).
BLEED AIR Panel
BLEED AIR Panel
Figure 18−10−6
PNEUMATIC SYSTEM
Description
Vol. 2 18−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
EICAS STATUS Page
EICAS STATUS Page − Bleed Pressure Readouts
Figure 18−10−7
EICAS MESSAGES
Message Meaning Aural Warning (If Any)
L 10TH DUCT
Bleed air leak in the respective 10th-stage ducting. “BLEED AIR DUCT”
R 10TH DUCT
L 14TH DUCT
Bleed air leak in the respective 14th-stage ducting. “BLEED AIR DUCT”
　
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