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NW747-400
Topic Author
Posts: 451
Joined: Tue Jun 08, 1999 4:42 am

757 Ice Protection

Sun Jun 11, 2006 8:02 am

I've often heard that the 757 wing simply will not ice if icing conditions prevail. It is my understanding that Boeing tried to certify the aircraft with no wing anti-ice system but were unable to do so. The aircraft is equipped with wing anti-ice, but flight crews never utilize the system.

What prevents the 757 from icing up?
 
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fr8mech
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RE: 757 Ice Protection

Sun Jun 11, 2006 9:57 am

that's a pretty general statement and I believe, false. I have jumpseated in several B757's and have seen wing and engine anti-ice used when the conditions required their use.
When seconds count, the police are minutes away, or may not come at all.
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liedetectors
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RE: 757 Ice Protection

Sun Jun 11, 2006 10:00 am

Quoting NW747-400 (Thread starter):
It is my understanding that Boeing tried to certify the aircraft with no wing anti-ice system but were unable to do so.

According to FAR Part 25, any airplane that may fly into icing conditions must have icing protection. So i think you may have your facts confused. Can you tell us where you got that info?

Seeing how there is no leading edge boots on the 757, the leading edges are heated from bleed air.
If it was said by us, then it must be true.
 
Grbld
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RE: 757 Ice Protection

Sun Jun 11, 2006 10:17 am

Having flown the 757 for a few years, I do recall hardly ever using wing anti-ice except in severe icing conditions, whereas on the 737NG we use it all the time.

The wing 'may' be less susceptible to ice buildups but I don't believe that Boeing would ever try to certify it without wing anti-ice. It's like saying that chances are so small that one engine will fail that you won't do engine-out certification.

Grbld
 
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HAWK21M
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RE: 757 Ice Protection

Sun Jun 11, 2006 1:39 pm

On The B752 only the Outboard Slats ie #1 & 10 are not WTAI equipped.The rest are.
Added with Engine A/I & Windshield Wipers/Hydrophobic coatings,The Rain Repellant has been deactivated for Obvious reasons.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
Newark777
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RE: 757 Ice Protection

Sun Jun 11, 2006 2:18 pm

Quoting Liedetectors (Reply 2):
Seeing how there is no leading edge boots on the 757

Do any jets have the boots? Or just props?

Harry
Why grab a Heine when you can grab a Busch?
 
PhilSquares
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RE: 757 Ice Protection

Sun Jun 11, 2006 6:00 pm

Don't know about the 737 but on the 727, 747 and 744 with the leading edges deployed the wing anti-ice is deactivated.
Fly fast, live slow
 
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HAWK21M
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RE: 757 Ice Protection

Sun Jun 11, 2006 6:15 pm

Quoting PhilSquares (Reply 6):
Don't know about the 737 but on the 727, 747 and 744 with the leading edges deployed the wing anti-ice is deactivated

Not on the B737.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
liedetectors
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RE: 757 Ice Protection

Mon Jun 12, 2006 1:15 am

Quoting Newark777 (Reply 5):
Do any jets have the boots? Or just props?

The Gulfstream/IAI G100 and G200 has boots. I am sure there are more.
If it was said by us, then it must be true.
 
NW747-400
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RE: 757 Ice Protection

Mon Jun 12, 2006 3:12 am

Just a bunch of BS I heard from a professor a few months ago. Just wanted to verify. Thanks
 
ArmitageShanks
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RE: 757 Ice Protection

Mon Jun 12, 2006 7:51 am

Quoting Newark777 (Reply 5):
Do any jets have the boots?

I believe most Citations have them.
 
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HAWK21M
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RE: 757 Ice Protection

Mon Jun 12, 2006 6:50 pm

Quoting NW747-400 (Reply 9):
Just a bunch of BS I heard from a professor a few months ago

Was this Professor,well versed in Aviation.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
Mender
Posts: 249
Joined: Wed Feb 04, 2004 9:36 am

RE: 757 Ice Protection

Mon Jun 12, 2006 9:03 pm

Worth pointing out. The vertical fin and horizontal stab leading edges do not have any form of anti ice. You find it on small aircraft but not on the 737, 757, 767. Don't know about the 747 or 777 but I doubt they have it.
 
NW747-400
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RE: 757 Ice Protection

Tue Jun 13, 2006 6:58 am

Quoting HAWK21M (Reply 11):
Was this Professor,well versed in Aviation.

Yes...he holds 737/747/B1900 type ratings and an ATP

No 757 experience though, which is why I wanted to ask about the topic. Seemed pretty unusual.

[Edited 2006-06-13 00:16:10]
 
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HAWK21M
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RE: 757 Ice Protection

Tue Jun 13, 2006 6:50 pm

Quoting NW747-400 (Reply 13):
Yes...he holds 737/747/B1900 type ratings and an ATP

No 757 experience though, which is why I wanted to ask about the topic. Seemed pretty unusual.

Then Someone has told him something Wrong I guess.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
Yikes!
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RE: 757 Ice Protection

Thu Jun 15, 2006 11:37 pm

I have used wing anti-ice on both the 757 and 767 on occasion. Usually, you only get exposed to moderate/severe icing in the lower levels as you are "trapped" somewhat by departure and arrival procedures. It is easier to avoid enroute climb/descent or cruise icing encounters.

At higher forward speeds, compressibility prevents ice from forming even with SAT's below 0 C. TAT can be as high as +10 with a SAT reading of -5 if forward IAS is high enough.

I've tended to use the wing anti-ice system as a deicer though, especially with mixed or clear icing encounters due to the phenomena of runback.

I am now flying a 767 with an automatic anti-ice system. I first encountered a BF Goodrich automated system back in the early 1990's on a turboprop. To be blunt, it sucked. I watched one day (the probe was visible from the cockpit) as nearly 1/4 inch of pure white rime formed on the probe with no indication of icing conditions. Which is probably why this is the only 75/76 I've seen with it.
 
SlamClick
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RE: 757 Ice Protection

Thu Jun 15, 2006 11:56 pm

Quoting ArmitageShanks (Reply 10):
Quoting Newark777 (Reply 5):
Do any jets have the boots?

I believe most Citations have them.

Uhhh, he asked about JETS.  duck 

Dont believe I've ever seen boots on a transport category jet. Also recall seeing a porous leading edge and alcohol system on the early DH125.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
liedetectors
Posts: 323
Joined: Thu Jul 21, 2005 10:44 am

RE: 757 Ice Protection

Fri Jun 16, 2006 7:20 am

Quoting SlamClick (Reply 16):
Uhhh, he asked about JETS.

The Citation maybe a wimpy jet, but yea its a jet.

Quoting SlamClick (Reply 16):
Dont believe I've ever seen boots on a transport category jet.

Read above....

Quoting SlamClick (Reply 16):
Also recall seeing a porous leading edge and alcohol system on the early DH125.

Hmm thats sounds kind of neat, do you have any pics of that?
If it was said by us, then it must be true.
 
Max Q
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RE: 757 Ice Protection

Fri Jun 16, 2006 11:49 am

Yes, our 767's (200 and 400's) have the Auto Wing and Engine anti ice function, but it was found to be a little too optimistic (hardly ever activating)

Our procedure now is to switch to Auto on the after take off check, but with icing conditions (visible moisture and TAT below 10c) we activate Engine anti ice manually.

Wing anti ice activation is rarely required but when we see an ice build up on the windshield wiper we will turn it on.Wing anti ice cannot be activated on the ground and will trip off automatically on landing.
The best contribution to safety is a competent Pilot.


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