Basically, when to use them? I have been selecting anti-ice on, engine and wings, when TAT is 10

As you say engine anti ice should be used in visible moisture below 10 degrees celcius. Use of anti ice on the ground for extended periods also requires engine runups according to which engine type is installed.In climb and cruise anti ice should be turned on for flight into visible moisture with the temperature in the range of -40 to 10 degrees celcius. These figures also apply to descent on a CF6, but at all times below 10 degrees on a JT9 or RB211 (I'm not sure about late PW engines).Wing anti ice is only used when ice has built up on the leading edges. Having it on is just depriving other systems of pneumatics.Cheers.

Just to be sure eng anti-ice should be on when in moisture and the SAT is -40C or more and the TAT is +1- or less, anything more extreme than these figures then disregard it!FS doesn't model ice build-up on the wings AFAIK.

"Having it on is just depriving other systems of pneumatics."Hi Anthony,Can you explain that last sentence, please? Is it to do with the redirection of engine bleed air to the wings? How does this affectthe pneumatics?Thanks,Frank

Muppet22,Just a small correction to your information. EAI should be on whenever the Total Air Temperature (TAT) is +10 or less (rather than +1 or less)and the flight is conducted in visible moisture. I have flow several different types of aircaft and this +10 TAT seems to be a very common figure. If the SAT ( basically the actual OAT) is -40C or less some operators allow you to discontinue the use of the EAI.If some are wondering, +10 TAT is used to allow for any cooling to 0 or below that may occur due to the pressure drop as the air accelerates around and into the engine nacelles.And, as said previously I believe, Wing A/A is usually only used when required (i.e. ice building up on the wing). It has been my (at least real world) experience that you have to be in pretty good icing for the stuff to stick to the wing leading edges anyway so it is rarely used.Kevin in CYOW

Yeah sorry that was meant to read +10, a typo pressed '-' instead of '0' :-)

Thanks guys! My question was answered as I knew it would be. I had no idead the WAI wasn't used as much, however. I've been selecting it on along with the EAI because I just didn't know. Now I do. Thanks for all the help. I appreciate it.Regards,Dan Zollner[MARQUEE]http://members.aol.com/deejay2276/CSXsd40-2left.gif http://members.aol.com/deejay2276/CSXsd40-2YBright.gif http://members.aol.com/deejay2276/CSXcoil2.gif http://members.aol.com/deejay2276/CSXcoil2.gif http://members.aol.com/deejay2276/CSXcoil2.gif http://members.aol.com/deejay2276/CRcoil.gif http://members.aol.com/deejay2276/CRcoil.gif http://members.aol.com/deejay2276/BNSFcoil.gif http://members.aol.com/deejay2276/BNSFcoil.gif http://members.aol.com/deejay2276/BNSFcoil.gif http://members.aol.com/deejay2276/CSXcoil2.gif http://members.aol.com/deejay2276/NScoil.gif http://members.aol.com/deejay2276/CRcoil.gif http://members.aol.com/deejay2276/CRcoil.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CRcoil.gif http://members.aol.com/deejay2276/CSXgondola.gif http://members.aol.com/deejay2276/CSXgondola.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CSXboxcar.gif http://members.aol.com/deejay2276/CRboxcar.gif http://members.aol.com/deejay2276/CRQboxcar.gif http://members.aol.com/deejay2276/FLps2hop.gif http://members.aol.com/deejay2276/CSXcemhop.gif http://members.aol.com/deejay2276/CSXcemhop.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CSXcf3202.gif http://members.aol.com/deejay2276/NSboxcar.gif http://members.aol.com/deejay2276/NShi-cube.gif http://members.aol.com/deejay2276/CRhi-cube.gif http://members.aol.com/deejay2276/CRhi-cube.gif http://members.aol.com/deejay2276/CRboxcar.gif http://members.aol.com/deejay2276/CSXhicube.gif http://members.aol.com/deejay2276/CSXps2hop.gif http://members.aol.com/deejay2276/CSXps2hop.gif http://members.aol.com/deejay2276/CSXps2hop.gif http://members.aol.com/deejay2276/CSXcf4650.gif http://members.aol.com/deejay2276/CSXcf4650.gif http://members.aol.com/deejay2276/CSXcf3202.gif http://members.aol.com/deejay2276/CSXgondola.gif http://members.aol.com/deejay2276/CRgondola.gif http://members.aol.com/deejay2276/CRgondola.gif Courtesy of http://www.frograil.com[/MARQUEE]Living on the Crawfordsville Brand Subdivision, MP 21

Hi Dan,Most airlines teach to turn on airfoil anti-ice anytime engine anti-ice is turned on. (except during takeoff) The problem in large jets is that you can't see the wings from the cockpit to know if ice is building so if conditions are right for the use of engine heat, airfoil heat shold be used. On the DC-9, DC-10 and 757 we used to look for ice starting to form on the winshield wiper arm. If we saw it there we turned on anti-ice regardless of what the temp was.Regards,Ed WeberNorthwest Airlines - Retired