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3rd FMC On The 767, PFD  
User currently offlinekrisyyz From Canada, joined Nov 2004, 1593 posts, RR: 0
Posted (2 years 8 months 3 weeks 2 days 11 hours ago) and read 3689 times:

Hello,


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Obviously, the display unit on the pedestal is not a full FMC. Is it used for data-link only? How do the pilots input info into this unit, is it touchscreen or do they use one of the primary FMCs like on the 777?

Also, some 767s have a speed-tape on the PFD and some have the fast-slow indication. Is this feature dependent on the CRT hardware or just the software? Do pilots really care which speed indicator they have since there is an analog indicator right next to the PFD?

Thanks,

KrisYYZ

7 replies: All unread, jump to last
 
User currently offlineDalmd88 From United States of America, joined Jul 2000, 2571 posts, RR: 14
Reply 1, posted (2 years 8 months 3 weeks 2 days 10 hours ago) and read 3658 times:

The display unit on the aft center pedestal is for ACARS only I believe. The center FMC is used only for approach mode and as a back up if the left or right fails. I think the flight planning gets inputted into one of the FMCs and then is copied into the other two.

User currently offlineCrimsonNL From Netherlands, joined Dec 2007, 1887 posts, RR: 42
Reply 2, posted (2 years 8 months 3 weeks 2 days 5 hours ago) and read 3567 times:
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I know that OS has a very similar device on their F-100's as seen in this picture (it's switched off though)


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From work experience I know that it's a touch screen and at least at OS it's used for ACARS (maybe for other purposes as well)



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User currently offlineFabo From Slovakia, joined Aug 2005, 1219 posts, RR: 1
Reply 3, posted (2 years 8 months 3 weeks 2 days 3 hours ago) and read 3516 times:

Quoting krisyyz (Thread starter):
a full FMC

That is a very common thing, but that is NOT an FMC, neither are the two boxes by the pilots knees.

FMC(s) sit down in the avionics bay. These are CDUs, or MCDUs (control/display units).

Think this way:

the FMC is the computer box:


The CDU is the monitor and the keyboard. You use them to interact with the computer, but they are not the computer itself.



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User currently offlineN243NW From United States of America, joined Jul 2003, 1637 posts, RR: 20
Reply 4, posted (2 years 8 months 3 weeks 1 day 20 hours ago) and read 3415 times:

Quoting CrimsonNL (Reply 2):
I know that OS has a very similar device on their F-100's as seen in this picture

So do the older ex-TWA MD-80s (the new ones have the dual MCDUs). The unit is made by Rockwell Collins and is in almost all aspects identical to the one on the F100 (and probably the 767 pictured above, too).


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User currently offlinekrisyyz From Canada, joined Nov 2004, 1593 posts, RR: 0
Reply 5, posted (2 years 8 months 3 weeks 1 day 12 hours ago) and read 3337 times:

Quoting Dalmd88 (Reply 1):
The display unit on the aft center pedestal is for ACARS only I believe
Quoting Fabo (Reply 3):
That is a very common thing, but that is NOT an FMC, neither are the two boxes by the pilots knees.
Quoting N243NW (Reply 4):
The unit is made by Rockwell Collins

Thank you!

KrisYYZ


User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2565 posts, RR: 25
Reply 6, posted (2 years 8 months 3 weeks 1 day 1 hour ago) and read 3218 times:

Quoting krisyyz (Thread starter):
Obviously, the display unit on the pedestal is not a full FMC. Is it used for data-link only? How do the pilots input info into this unit, is it touchscreen or do they use one of the primary FMCs like on the 777?

The device on the centre pedestal looks like an ACARS CDU. It's not part of the FMS as such, though it might provide data to it (flight plans, clearances, etc).

Quoting krisyyz (Thread starter):
Also, some 767s have a speed-tape on the PFD and some have the fast-slow indication. Is this feature dependent on the CRT hardware or just the software? Do pilots really care which speed indicator they have since there is an analog indicator right next to the PFD?

The choice of speed tape or fast/slow pointer is a customer option. The hardware is the same, it's the software which works differently depending on the programme pin options chosen. The speed tape gives more information to the pilot than a traditional ASI can (stall speed, reference speed, buffet limits, flap extension/retraction cues, speed trend vector, etc). The fast/slow pointer style is a more basic display, directly replicating a traditional ADI. KLM went as far as removing the ASI's altogether on their 737s and 767s as the PFD speedtape made them redundant. Other airlines may have done so too.


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[Edited 2012-02-01 16:40:46]


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User currently offlinekrisyyz From Canada, joined Nov 2004, 1593 posts, RR: 0
Reply 7, posted (2 years 8 months 3 weeks 23 hours ago) and read 3186 times:

Quoting Jetlagged (Reply 6):
The choice of speed tape or fast/slow pointer is a customer option. The hardware is the same, it's the software which works differently depending on the programme pin options chosen. The speed tape gives more information to the pilot than a traditional ASI can (stall speed, reference speed, buffet limits, flap extension/retraction cues, speed trend vector, etc). The fast/slow pointer style is a more basic display, directly replicating a traditional ADI. KLM went as far as removing the ASI's altogether on their 737s and 767s as the PFD speedtape made them redundant. Other airlines may have done so too.

Thanks! That answered by question!

KrisYYz


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