Fear of the Dark

[Fredo_69]

I have just watched the film (blaming xmas). I have a couple of questions regarding the HUD symbology.

 

0:53, the fpm is tucked top left of the HUD, while the AC is clearly not headed that way (in a right turn). Why is this?

1:06, the fpm disappears from the HUD. I know that Viggen lacks a pitch ladder, but it's odd that the fpm should disappear from the HUD; i would expect it to get tucked in the to nearest neighbouring position. Is it supposed to disappear like that?

Yes, its only the +/-5 deg lines. You find all information in the manual here: https://forums.eagle.ru/showthread.php?t=180252

[Fishbreath]

I have just watched the film (blaming xmas). I have a couple of questions regarding the HUD symbology.

 

0:53, the fpm is tucked top left of the HUD, while the AC is clearly not headed that way (in a right turn). Why is this?

1:06, the fpm disappears from the HUD. I know that Viggen lacks a pitch ladder, but it's odd that the fpm should disappear from the HUD; i would expect it to get tucked in the to nearest neighbouring position. Is it supposed to disappear like that?

 

The FPM is the winged-and-tailed circle. The lines (to which I believe you're referring, since they're off to the left at 0:53 and gone at 1:06) are navigational information. When they're offset to the left, the AC is to the right of the desired heading. (Or is it the desired track? I don't know offhand.) You'll note that at 1:16 or 1:17 he flies back onto the desired heading and centers the post track again.

 

At 1:06, the navigational reference disappears because it automatically declutters if the HUD Slave switch is set to ON and the altitude is <100 meters.