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Use of Anti Icing
Andy wrote:
On Dec 3, 11:13 am, Sam Spade wrote: Most airliners cannot use wing de-ice until after takeoff and at not less than 400 feet; sometimes higher. The bleed air required for wing de-ice takes so much power that it invalidates the takeoff flight path performance. MD-11 must be more sophisticated than "most airliners". If icing conditions are expected on takeoff the wing and tail anti ice are selected ON after engine start. The valves open when the aircraft transitions from ground to in-air. Wing and tail anti ice cannot be used on ground as the slats/leading edges will overheat. In flight, the CFM requires wing and tail anti ice to be ON if icing detection system indicates icing is present, or if icing is expected. There is no specification of how soon before entering icing conditions the systems should be selected ON. Andy On the B-727, wing anti-ice cannot operate on the ground, but will open up once airborne, like the MD-11. On the B-737-200, you *can* operate the wing anti-ice on the ground, but it automatically snaps off when takeoff power is applied, and must manually be switched back on once airborne. On the DC-6/7, fuel fired heaters blow hot air throughout the leading edges, and of course there is no performance decrement. The heater units are of the exact same type that supplies heated air to the cabin, and circulates heated air in between the windshield panes. Happy Flying! Scott Skylane |
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