Had the horizontal centered, but was too high in my approach. Any ideas? Failed ILS landing at KSEA (Seattle) rwy 16L HDG 163 FRQ 110.3 dialed into NAV1 and NAV2.Thanks for any suggestions, and if anyone knows what NO AIII (letter A followed by three letter i (as in 'idea')) means in the HUGS display please share?RSMFSX = REX 2 OD = UTX = PDMG 737NGX = FRAPS 2.0 = ULTIMATE TRAFFIC 2

Hello Anonymous,Approach Mode CAT 3.Looks like you were too high in your approach for CAT3 ops.

Any sensor or equipment condition that results in a loss of AIII capability will causea “NO AIII” annunciation displayed on the combiner and on the control paneldisplay. The first officer’s AIII annunciation is also extinguished. The annunciationwill remain until another mode is selected or AIII capability is regained.Below 500 ft radio altitude, with a loss of AIII capability or if the approach or flareperformance does not ensure a safe touchdown within the required touchdownzone, an APCH WARN annunciation will be displayed on the combiner and on theHGS Annunciator Panel.

I think you'd get and Approach Warn if you were too high, not a No AIII. (Below 500'.)