For wing anti-icing, bleed air from engines 1 and 3 flows through ducts in the leading edges of the wings and is the discharged overboard.
Air is passed through the leading edge slats, leading edge flaps (2 thru 5), fixed inboard wings above the leading edge flaps and the upper VHF antenna this is a mix of high and low pressure air. There is a automatic trip off system installed as a safety measure against a ruptured wing anti-ice duct in the pressurized area of the fuselage which would result in a rapid pressurization of the cabin (increase). If this occurs the wing anti-ice valves close automatically and the WING ANTI-ICE AUTO TRIP OFF light illuminates. (located on the flight engineers panel) There is a test switch installed to allow a check of the system before flight. Overheat protection is provided by temperature sensors located in the wing anti-ice ducting. When it gets too hot the DUCT OVERHEAT light illuminates. It's value is different depending whether you are in flight or on the ground. If you are on the ground is setting is less, and the anti-ice valves will close. In flight it has a higher value and the valves do not close. You can verify and locate the source of the overheat by looking at the DUCT TEMP indicator and using the anti-ice temp selector at the co pilots overhead panel. The wing anti-ice shutoff valves are overridden closed by pulling the fire handle. Valves are electrically operated.
For wing anti-icing, bleed air from engines 1 and 3 flows through ducts in the leading edges of the wings and is the discharged overboard.
Air is passed through the leading edge slats, leading edge flaps (2 thru 5), fixed inboard wings above the leading edge flaps and the upper VHF antenna this is a mix of high and low pressure air. There is a automatic trip off system installed as a safety measure against a ruptured wing anti-ice duct in the pressurized area of the fuselage which would result in a rapid pressurization of the cabin (increase). If this occurs the wing anti-ice valves close automatically and the WING ANTI-ICE AUTO TRIP OFF light illuminates. (located on the flight engineers panel) There is a test switch installed to allow a check of the system before flight. Overheat protection is provided by temperature sensors located in the wing anti-ice ducting. When it gets too hot the DUCT OVERHEAT light illuminates. It's value is different depending whether you are in flight or on the ground. If you are on the ground is setting is less, and the anti-ice valves will close. In flight it has a higher value and the valves do not close. You can verify and locate the source of the overheat by looking at the DUCT TEMP indicator and using the anti-ice temp selector at the co pilots overhead panel. The wing anti-ice shutoff valves are overridden closed by pulling the fire handle. Valves are electrically operated.
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