Boeing wing anti-ice
Boeing wing anti-ice
Joined: Jul 2007
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From: Germany
When decending though an icing layer last week?
Company SOP is anti Ice on with descent checks if you can expect to penetrate a freezing layer in the descent.
Other SOP is wing AI on if Ice Cue on climb.
Company SOP is anti Ice on with descent checks if you can expect to penetrate a freezing layer in the descent.
Other SOP is wing AI on if Ice Cue on climb.
Guest
Joined: Apr 2009
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From: On the Beach
411A:
That is your opinion, not a statement from the 707 AFM.
You apparently have never been in a 25 mile downwind for an ILS at ORD during moderate icing and speed restricted to 160 KIAS.
Never on the B707...simply not needed.
You apparently have never been in a 25 mile downwind for an ILS at ORD during moderate icing and speed restricted to 160 KIAS.
Mistrust in Management
Joined: Mar 2000
Posts: 986
Likes: 11
From: UK
Once on a 747 classic in 18 years - departing Anchorage and at about 2000 ft entered freezing rain where the front windshields started to 'glaze' over with ice.
Several times on 737's where ice was visually evident on the LE.
Never on a 757, never on a 777 and never on an A320.
Regards
Exeng
Several times on 737's where ice was visually evident on the LE.
Never on a 757, never on a 777 and never on an A320.
Regards
Exeng
Joined: Apr 2009
Aviation Qualifications: ATPL
Posts: 1,482
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From: A place in the sun
Once; on a training flight in a VC10 from Prestwick to Shannon when we were held down by ATC over Belfast at around 18,000ft (there was an ATC strike at the time). Ice began to build very rapidly on the windscreen wipers so I immediately put on the wing anti-ice and asked for a higher level which they refused. I argued and eventually got a higher level by saying I would go up anyway if they didn't coordinate with the next ATC facility. We got our higher level, but by then we had nearly 2 inches of ice on the wipers (they were a better ice detector than the official one!).
Joined: Apr 2010
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From: Home soon
Any time you use engine anti ice on ground due to atmospherical reasons you need to use wing anti ice except after a deicing/anti icing procedure.
In the air use it at deice unless severe icing for a long time(continious severe icing) use it as antiicing.
In the air use it at deice unless severe icing for a long time(continious severe icing) use it as antiicing.
Joined: Apr 2004
Posts: 2,167
Likes: 86
From: Planet Earth
'Any time you use engine anti ice on ground due to atmospherical reasons you need to use wing anti ice except after a deicing/anti icing procedure'
Er. what ?
Certainly on the 75 / 67, wing anti ice cannot be used on the ground. And why should you do this 'any time you use engine anti ice' ?
Er. what ?
Certainly on the 75 / 67, wing anti ice cannot be used on the ground. And why should you do this 'any time you use engine anti ice' ?
Joined: Mar 2001
Posts: 4,563
Likes: 35
From: I wouldn't know.
It's the boeing recommended procedure on the 737, so yes, it does not apply to other aircraft. Using it on the ground is a given therefore, but as the 737 packs on quite a lot of ice fast it is used quite frequently in flight as well.
Joined: Dec 1999
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From: Daansaaf
Those on the 757/767 generally say that they've never used wing anti ice because they can't see the wing from the flightdeck. There's rarely any sign of ice on the windscreen either. That doesn't mean that the leading edge hasn't iced up. I can't comment on the more exotic types having never flown them.
Now either the 737 is incredibly susceptible to leading edge icing or it's simply that the less aerodynamic profile of the windscreen shows icing more and that we can actually see the leading edge and watch the ice accretion.
I used it a couple of time on the 757 when it became obvious that we were in severe icing conditions. I use it pretty much every day in the winter on the 737.
God wouldn't dare ice up 411A's aircraft: he knows his place.
Now either the 737 is incredibly susceptible to leading edge icing or it's simply that the less aerodynamic profile of the windscreen shows icing more and that we can actually see the leading edge and watch the ice accretion.
I used it a couple of time on the 757 when it became obvious that we were in severe icing conditions. I use it pretty much every day in the winter on the 737.
God wouldn't dare ice up 411A's aircraft: he knows his place.
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
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From: UK
I must admit I have NEVER understood Boeing's logic (737) - sticking on wing anti-ice at 9.9 degrees C seems illogical, but hey, stick with the book. I would far rather it were left to my judgement.
- I'd be surprised if it ever cooled enough, heat, kitchen etc etc.
God wouldn't dare ice up 411A's aircraft: he knows his place.
Joined: Mar 2010
Posts: 623
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From: UK
The Boeing 747 anti-ice is actually a de-icer. You should wait until there is a build up of ice on the wing leading edge and then switch it on for about two minutes to break the ice away. Switching it on so as to prevent ice forming can cause water to run back and freeze on the upper surface of the wing.
Having said that, the 747 wing is not prone to icing. In 32 years flying the 747 I never used it, and that included over 100 approaches into Chicago in the winter.
Dave
Having said that, the 747 wing is not prone to icing. In 32 years flying the 747 I never used it, and that included over 100 approaches into Chicago in the winter.
Dave