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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 18.10.8
Oct 05/06
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:
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L (R) 10TH DUCT warning EICAS message is displayed;
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MASTER WARNING switch/lights illuminate flashing;
.
“BLEED AIR DUCT” aural warning sounds; and
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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/CAUTION 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.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-CHAPTER 18 -空气 PNEUMATIC(5)
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