Hello,when i am on an ILS Approach I would like to set the Minimums in theVertical Horizont Gauge, then there are small green numbers in the down right corner. My question is how I know which height I should set?As far as I know you can see it on the ILS chart of the runway, but there are two heights, first one is DH and the second is DA. So which of them i have to set?

DH is Decision Height which is used when you use the radio altimeter which measures the actual height to the ground under the A/C sort of like a boat sonar device.DA means Decision Altitude and is used when using the barometric altitude. You can set the NG to use either DH or DA by clicking above the altimeter setting knob to the top right of the EFIS control panel. I think you use DA when commencing a precision approach and the DH on non precision approaches. But I could be very wrong here. Hopefully someone with more knowledge will correct me! Hope it helps,

I thought it was the other way around ie MDA (Min decision alt) for non precision and DH (decision height) for precision approaches?

Hmmm yes... I think you're right. A typo on my side. Height for radio altimeter and Altitude for barometric altimeter. And RA for precision approaches...Sorry... ;-)

>I thought it was the other way around ie MDA (Min decision>alt) for non precision and DH (decision height) for precision>approaches?It's actually DA for all approaches except CAT III autolands. Many many many airports have ILS CAT I approaches but don't meet the requirements for a relatively flat area on the approach path (so that a hill doesn't kick off your radar altimeter and trigger a flare) needed for an autoland.So, while the PMDG sim will autoland at any ILS equipped field, in real life the autoland is only performed on runways specifically designated to meet the requirements.I may have a couple of specifics wrong and some of the big iron drivers will correct me, but I know I'm right about using barometer-derived minimums for everything except autolands.

Sorry for bringing up an old thread, but I'm confused. Let's say I want to make a full autoland at the Munich ILS08L runway, and looking at the chart it says:DA, RA = 103DH = 100...so in this case I would set it so it says Radio = 100 in the PFD?-Mikkel

Hi Mikkel,I think(emphasise, think), you can use either, depending on which altimeter you wish to use for the appoach(?)DA is height above MSL(altimeter setting), DH is height above ground(from the radio altimeter). As I recall, approach charts give both DA and DH. ILS categories are specified in terms of DH(and vis), not DA. I am not sure why this is the case.Here is some more information on ILS categories:ILS CATI--- DH=200' 800m vis (autoland not available)ILS CATII--- DH=100' 400m vis (autoland with manual rollout)ILS CATIIIa--- DH=0' 200m vis (autoland with manual rollout)ILS CATIIIb--- DH=0' 50m vis (autoland with coupled rollout)ILS CATIIIc--- DH=0' 0m vis (autoland with coupled rollout)As you can see, ILS CATIIIc is a "zero-zero approach". CATIIIa ILS requires 2 A/Ps for autoland(fail passive).CATIIIb ILS requires 3 A/Ps for autoland(fail operational).CATIIIc ILS requires 3 A/Ps for autoland(fail operational).The 737NG is not currently capable of performing CATIIIb/c autoland as it has only 2 A/Ps. I understand this may change in the future.(By the way, does anyone know which aircraft are CATIIIc certified?).BR,Frank