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Why is HUD pitch indicator skewed to left or right sometimes?


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Posted

I'm sure it's a stupid question, but why is the HUD pitch indicator skewed to the left or right at times? It obscures other data on the HUD when that happens.

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Posted

I think it's supposed to indicate the effect of crosswind on your flightpath.

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Posted

Really? That's interesting.

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Posted

Drift is correct. Pitch lines follow your fpm by default so anything causing drift will cause them to move. Somewhere in the ifcc test menu you can disable that. In F-16 it's called drift c/O for drift compensation.

 

I found it weird at first but am now totally used to it.

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Posted

Thanks for that. fpm?

Anyone know how to disable it in the A-10C?

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Posted (edited)
Somewhere in the ifcc test menu you can disable that.

 

You're sure? The corresponding manual section is at page 359 (from 671), at least I didn't found something like that.

 

Thanks for that. fpm?

FPM = Flight Path Marker, or also called TVV for total velocity vector. It's this thing here:

 

MnYJLhc.jpg

 

Anyone know how to disable it in the A-10C?

Puma hints that it should be possible via the IFFCC menu. However I didn't find it yet.

 

You can access this menu by flicking the IFFCC switch to TEST. The HUD then displays the menu instead of the 'regular HUD'. At startup you probably notice that when performing the 'Startup Bit Test' in the HUD. After the test, you're in this menu. It's this switch here:

 

kbXLElH.jpg

Edited by Zabuza
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Posted

Thanks @Zabuza.

I always referred to that as TVV. never heard FPM being used before!

Yes, I looked at the IFCC test menus before, and I couldn't see what @Puma was referring to.

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Posted
I always referred to that as TVV. never heard FPM being used before!

 

I believe TVV is the correct name in the A-10C, but it's not uncommon to be called FPM as well; the manual even mentions this in the section on the TVV.

 

Maybe it's called TVV in the A-10C because there's also a Flight Plan Menu abbreviated as FPM in order to avoid confusion between the two, but honestly I'm not sure about the reasons for the naming convention.

Posted

Sorry to all on both points:

 

Indeed TVV is the correct term not FPM.

 

The A-10 does NOT have a drift C/O feature. Thread confirming here: https://forums.eagle.ru/showthread.php?t=111809

 

Lesson learned: Check my facts before posting. Thanks for getting the correct info up guys.

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