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Dotted Green Arc

Modesto2 From United States of America, joined Jul 2000, 2634 posts, RR: 6
Posted (12 years 6 days 2 hours ago) and read 1105 times:

After looking at some in-flight cockpit photos of the 744, I've noticed a dotted green arc that spans the ND. What is it? Thanks.

6 replies: All unread, jump to last

JT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 1, posted (12 years 6 days 2 hours ago) and read 1059 times:

Not sure what ND is, but if its like a vsi, the green arc is the tcas ra(resolution advisory). Should be a red arc also, which tells them where not to go..JT

AAR90 From United States of America, joined Jan 2000, 3410 posts, RR: 50
Reply 2, posted (12 years 5 days 22 hours ago) and read 1033 times:

ND = Navigation Display.
I've never seen a "dotted green arc." However, a dashed-line green arc can be drawn by inserting a distance from a point on the FMC's Fix page. The result is a circle around the fix at the prescribed distance. Zoom in with the fix not at the center of the ND and it can easily be viewed as an arc. Commonly used to show altitude restrictions based upon a distance during approach or departures.

*NO CARRIER* -- A Naval Aviator's worst nightmare!

Cdfmxtech From United States of America, joined Jul 2000, 1338 posts, RR: 29
Reply 3, posted (12 years 5 days 3 hours ago) and read 1010 times:

I think AAR90 hit on this already. There is a green arc which is solid, not dotted that shows the point that the aircraft will capture the selected altitude.

Modesto2 From United States of America, joined Jul 2000, 2634 posts, RR: 6
Reply 4, posted (12 years 5 days 1 hour ago) and read 999 times:

Look at the ND, you can see the green arc.

Click for large version

Photo © Craig Murray

Airplay From , joined Dec 1969, posts, RR:
Reply 5, posted (12 years 4 days 21 hours ago) and read 985 times:

Oh!

THAT green arc.

Smile

That segmented green line represents a boundary of a terminal area or other such navigation deliniation. It is part of the MAP display along with the little blue navaid symbols. If the display was "zoomed" out (Range changed) you would probably see a full circle or occasionally some other complex shape representative of the area boundary that it represents.

JT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 6, posted (12 years 3 days 15 hours ago) and read 964 times:

Definition problem--lol. We call that the ehsi, or just hsi..JT

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