737 Wing Anti Ice and Bleeds Off?
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737 Wing Anti Ice and Bleeds Off?
Maybe I´m supposed to know this but I´ve been unable to find it in the books...
If you need to take off with Anti Ice on and at the same time need Bleeds Off for performance reasons - do you then have to fly it as an unpressurized takeoff?
If you need to take off with Anti Ice on and at the same time need Bleeds Off for performance reasons - do you then have to fly it as an unpressurized takeoff?
Join Date: Apr 2005
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Wing antice does not work on the ground, so you can't take off with it on. On a B737 there is an air/ground sense input.
During take off you are using the deicing fluid to provide antice protection.
During take off you are using the deicing fluid to provide antice protection.
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Some (older?) 737s had ground inhibited WAI. Non ground inhibited WAI trips off when TO thrust is set. Engine AI is sourced on the engine side of the bleed air valves so it makes no difference what power source is supplying the packs.
so the short answer is 'no'.
so the short answer is 'no'.
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The 737NG will allow WAI on the ground.
When t/o power is set, the WAI valves close automatically.
At liftoff, the WAI switch on P5 overhead will auto off.
From then on, it's up to you!
Cheers, FD
When t/o power is set, the WAI valves close automatically.
At liftoff, the WAI switch on P5 overhead will auto off.
From then on, it's up to you!
Cheers, FD
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Well you made me look it up.
B737-200 inhibited on the ground.
B757
B767
B747-400
B777 all inhibited on the ground.
But B737-300 onwards works on the ground as FD says.
Why is that? Why should the B737 need WAI on ground, but no other Boeings?
B737-200 inhibited on the ground.
B757
B767
B747-400
B777 all inhibited on the ground.
But B737-300 onwards works on the ground as FD says.
Why is that? Why should the B737 need WAI on ground, but no other Boeings?
