typeII/IV fluids
Thread Starter
Joined: Nov 2004
Posts: 1,324
Likes: 156
From: Here, there, and everywhere
The reason I posted in the first place was because of an article I read recently. It says "...unless all surfaces are aerodynamically clean, the aircraft must first be de-iced with type I fluid. All type II/IV fluid must be removed with type I fluid before departure if the parking time has exceeded four hours."
I have not seen this in our de-ice manual. Is it in yours?
I have not seen this in our de-ice manual. Is it in yours?
ECON cruise, LR cruise...
Joined: Apr 2002
Posts: 569
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From: MIRSI hold - give or take...
Hi punkalouver,
I cannot see that as preventing use of typ. II & IV fluids. It only states that - of such types had been applied earlier, they will - after 4 hours (
) have watered down so much that they consitute more of a freezing threath than any kind of protection - and must therefore be removed like all other contaminants. You would only run into this problem if you - after being deiced/anti-iced had a delay for more than 4 hours...
However - I can read that paragraph as prohibiting the use of a one-step procedure. First you must remove the contaminants using type I - and than onto anti-icing with type II/IV. So you're right - you will need type I to comply with the wording in that paragraph.
Used to fly in Norway - on runways where the ATR did not like type II/IV (if you wanted to carry anything but yourselves and a few drops of fuel). Solution - board pax in hangar, then apply type I fluid. Since in the hangar - the HOT had not yet started. Then start 2 in H-mode (with prop-brake), push-out while starting 1, and then hurry off to the runway. Seem to remember we had 7 min. HOT from when the tail first stuck out of the hangar
Brgds
Empty
I cannot see that as preventing use of typ. II & IV fluids. It only states that - of such types had been applied earlier, they will - after 4 hours (
) have watered down so much that they consitute more of a freezing threath than any kind of protection - and must therefore be removed like all other contaminants. You would only run into this problem if you - after being deiced/anti-iced had a delay for more than 4 hours...However - I can read that paragraph as prohibiting the use of a one-step procedure. First you must remove the contaminants using type I - and than onto anti-icing with type II/IV. So you're right - you will need type I to comply with the wording in that paragraph.
Used to fly in Norway - on runways where the ATR did not like type II/IV (if you wanted to carry anything but yourselves and a few drops of fuel). Solution - board pax in hangar, then apply type I fluid. Since in the hangar - the HOT had not yet started. Then start 2 in H-mode (with prop-brake), push-out while starting 1, and then hurry off to the runway. Seem to remember we had 7 min. HOT from when the tail first stuck out of the hangar
Brgds
Empty
Thread Starter
Joined: Nov 2004
Posts: 1,324
Likes: 156
From: Here, there, and everywhere
Thanks for the interesting post empty cruise. I as well read that a two step procedure is required. Is any one out there authorized sprayed down contaminated wings with just the type II or IV ?
Joined: Jun 2003
Posts: 156
Likes: 0
From: Madrid
Of course, this is the standard procedure all over european airports (don´t know about turboprops). Type II/IV fluids when heated (60ēC) and diluted may be used for deicing and antiicing in a single step.
If you want to know more check:
http://www.boeing.com/commercial/aer.../aero_08/deice
www.aea.be
www.alpa.org/internet/alp/2000/nov00p15.htm
If you want to know more check:
http://www.boeing.com/commercial/aer.../aero_08/deice
www.aea.be
www.alpa.org/internet/alp/2000/nov00p15.htm
