CRJ700/900 anti-ice question

ProudPilot

ProudPilot

Aeronautics Geek
Hi guys,

I have a quick review of the 700/900 for my 200 systems class. I'm curious on the leading edge anti-ice system and how it works when the slats are deployed. Do you retain the ability to heat the leading edge when the slats are deployed, or do you lose this functionality? Also, are they normally heated by what looks like a duct on the main wing that contacts the slats/leading edge when the slats are retracted? Lastly, is there functionality if the slats are deployed to continue to heat the wing leading edge but not the slats?

Thanks,
 
ProudPilot said:
Do you retain the ability to heat the leading edge when the slats are deployed, or do you lose this functionality? Also, are they normally heated by what looks like a duct on the main wing that contacts the slats/leading edge when the slats are retracted? Lastly, is there functionality if the slats are deployed to continue to heat the wing leading edge but not the slats?
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The duct (piccolo duct) is physically located in the slat - so the leading edge of the wing is never heated just the slat. The slats are heated when the wing anti-ice is on, stowed or deployed.
 
ProudPilot said:
So the piccolo duct comes from the bleed air system through the slat supports and into the slat?
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Hmmm not exactly... I'll let some of the more senior guys tell ya more. Just went through differences and basically when the slats are extended the anti ice blows harder thus allowing it to reach the slats when they are extended. Really its not much different from the 200 as far as how the leading edges are deiced though.
 
Hi Guys,

For those that are tech savvy with the 700/900, I would like to know truly how this works. By photos that I've looked at, it appears that the ducts route the 6/10 stage bleed air into the slats via ports (looks like 2) on each slat section. When the slats are deployed they droop down (25 degrees, correct?) enough to increase the boundary layer energy. If you threw bleed air into this air, it would A. Create a turbulent airflow reducing overall boundary layer energy, and 2, most likely not reach the slat with a 140 kt wind going through it.

So, does it go through the slat supports, or does the bleed air shut off when the slats are deployed? If so, what's your company policy on landing the 700/900 during icing with slats deployed?


Oh, and I'm a fan of tech answers!

:yeahthat::rawk:
 
ProudPilot said:
So, does it go through the slat supports, or does the bleed air shut off when the slats are deployed? If so, what's your company policy on landing the 700/900 during icing with slats deployed?
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I am not a techy-guy. I just fly the stupid thing. Short of a slat/flaps failure, you need them to land the airplane - icing or not.

There is a single duct that gets the bleed air from the wing root to the slats - so it should work whether the slats are extended or stowed. If it doesn't work, the temp sensor at the end of the wing should caution and the pilots would know that their wings aren't getting anti-iced.

I don't know what pictures you have, will these pictures help?
Doesn't this belong in tech questions and not pilots?
 

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Woodreau, Perfect! That's gotta be the mx manual, cause my bombardier manual had no such diagrams or explanations. Very interesting that they use a telescoping duct to route air to the slat. That's gotta be a weak point in the system, but if it works it works!

Thank You!
 
ProudPilot said:
I love your signature btw, Jenny is awesome, and Tennant does incredibly well. "Time to run? Love the running!"

-Evan
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That was a great episode. Can't wait to see the rest of the season since it looks like from the mid-season BBC trailer that Rose's alternate universe is bleeding over again.
 
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