B737 engine and wing anti-ice at the gate?
Thread Starter
Joined: Feb 2002
Posts: 1,682
Likes: 9
From: Funky Town
B737 engine and wing anti-ice at the gate?
Hi,
If you are at the gate, APU power, and you select the wing or engine anti-ice on the APU on, the bleed pressure drops significantly...the air is going somewhere.
Is wing and engine anti-ice effective at the gate while on APU power? If not, where is all the air going?
Thanks!
If you are at the gate, APU power, and you select the wing or engine anti-ice on the APU on, the bleed pressure drops significantly...the air is going somewhere.
Is wing and engine anti-ice effective at the gate while on APU power? If not, where is all the air going?
Thanks!
Joined: May 2003
Posts: 831
Likes: 0
From: The Roman Empire
B73567AMT is correct.
However, there are dozens of variants of our beloved toy...
In our fleet we have both types, one "normal", and one modified on which you have to keep the switch in the GROUND TEST position to open on the ground.
However, there are dozens of variants of our beloved toy...
In our fleet we have both types, one "normal", and one modified on which you have to keep the switch in the GROUND TEST position to open on the ground.
Joined: Jun 2001
Posts: 436
Likes: 0
From: Peoples Republic of EU
On our -300 and NG aircraft the following applies:
Wing anti ice can be used on the ground, it is selected during the after start checks if required.
However when the aircraft rotates the wing anti ice automatically shuts off, this is so that in the unlikely event of an engine failure the WAI doesn't take any power away from the engine when it is critical. It can be reselected at a later stage.
Hope that clears it up.
Wing anti ice can be used on the ground, it is selected during the after start checks if required.
However when the aircraft rotates the wing anti ice automatically shuts off, this is so that in the unlikely event of an engine failure the WAI doesn't take any power away from the engine when it is critical. It can be reselected at a later stage.
Hope that clears it up.
Only half a speed-brake
Joined: Apr 2003
Posts: 4,459
Likes: 136
From: Commuting not home
more variants:
Ours (-4/500) close the WAI valve when thrust levers are moved through the TKOF warning position (lights go bright blue for switch/valve disagreement). At lift-off, only the switch trips to (correct) OFF position.
Precisely as described in VOL2 pg. 3.20.6.
This is also performance wise should engine fail between V1 and Vr. In case you need WAI on ground, it is most likely that the runway will be at least wet so there will be some time to go from V1 to lift-off. Our engines are not restricted to failing when airborne only.
Can be reselected any time when the AC is in air mode (click at liftoff), i.e. immediately. However should I really NEED the WAI after take-off, I'd decide not to fly at all.
Cheers,
FD
Ours (-4/500) close the WAI valve when thrust levers are moved through the TKOF warning position (lights go bright blue for switch/valve disagreement). At lift-off, only the switch trips to (correct) OFF position.
Precisely as described in VOL2 pg. 3.20.6.
This is also performance wise should engine fail between V1 and Vr. In case you need WAI on ground, it is most likely that the runway will be at least wet so there will be some time to go from V1 to lift-off. Our engines are not restricted to failing when airborne only.
Can be reselected any time when the AC is in air mode (click at liftoff), i.e. immediately. However should I really NEED the WAI after take-off, I'd decide not to fly at all.
Cheers,
FD
