airwave
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Special Letters On FMCs?

Wed Jun 07, 2006 5:48 am

Since there is no such thing as a stupid question, we'll just call this an odd one.

I was looking at pics of FMCs earlier and I noticed that on one, the keyboard has several letters with white box lines, such as:

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Click here for bigger photo!

Photo © Craig Murray



while others do not:

View Large View Medium
Click here for bigger photo!

Photo © Daniel Werner



Is there any particular reason or function for this? It seems to be a recent feature, so which aircraft have it?It's not a big deal, it just seemed interesting and my curiousity was piqued, lol. Thanks for any help, guys.


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bri2k1
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 5:54 am

The letters with boxes around them in the top picture are E, N, S, and W. Aside from spelling NEWS, they represent North, South, East, and West. Never having used one, I don't know how often you input the cardinal directions, but there's my guess.
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atlamt
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 5:54 am

Just a stab at this one but it looks like compas headings. North South East and West. Probably to make entering the position eaiser.
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airwave
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 6:02 am

Quoting Bri2k1 (Reply 1):
they represent North, South, East, and West.



Quoting Atlamt (Reply 2):
it looks like compas headings. North South East and West.

Oh, wow. Completely missed making that connection, haha. You guys are probably spot on; it's gotta be compass-related. Thanks for making the obvious, er, obvious, lol.

But now, this begs another question: how would that function be used, as I was under the impression that headings were entered as three-digit numbers, not letters.


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SlamClick
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 6:07 am

They do indeed stand for North South East and West but not for inputting heading information.

It is for N or S latitude and E or W longitude when inputting waypoints.
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airwave
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 6:36 am

Quoting SlamClick (Reply 4):
It is for N or S latitude and E or W longitude when inputting waypoints.
Cool huh?

Ahhh, now I get it. That is cool, haha. Thanks, SlamClick.


Airwave  eyebrow 
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DC-10Tech
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RE: Special Letters On FMCs?

Wed Jun 07, 2006 2:44 pm

Quoting Airwave (Reply 3):
But now, this begs another question: how would that function be used, as I was under the impression that headings were entered as three-digit numbers, not letters.

They're for inputting manual waypoints.
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HAWK21M
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RE: Special Letters On FMCs?

Thu Jun 08, 2006 2:07 am

The Keys N E W S are used to Type in Lattitude & Longitude if IRS is tuned from the FMC CDU rather than the IRMP/IRS Select panel.
regds
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Mir
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RE: Special Letters On FMCs?

Thu Jun 08, 2006 11:35 am

When you go over the Atlantic, your waypoint are in latitude and longitude. 55N40W, for instance. That's where they come in handy.

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CosmicCruiser
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RE: Special Letters On FMCs?

Thu Jun 08, 2006 11:49 am

Quoting HAWK21M (Reply 7):
The Keys N E W S are used to Type in Lattitude & Longitude if IRS is tuned from the FMC CDU rather than the IRMP/IRS Select panel.
regds

not sure I get what you're saying unless you're referring to the Standby Flt Pln but others are correct. It's for inputing manual waypoints for whatever reason. For example, the NATs waypoints are entered manually in a shortcut format (at least in our database) eg. type and enter 5030N and you get N50.00.0, W030.00.0. If you need to go to a waypoint that's not in your database you can just enter the Lat/Lon and away you goooo.

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