Altimeter settings below 28.10

[Bananabrai]

Are altimeter settings below 28.10 inHG not possible?

I can not set QFE for Nellis in certain conditions (QNH 30.07 for example). -> QFE would be 28.08 or 28.09.

If that would an airfield I would like to attack, I can only set QNH and do the conversion on the fly.

[RustBelt]

Page 1-80 of the F-5E/F flight manual T.O. 1F-5E-1. Only goes down to 28.10 because it was built in a QNH country.

[Frederf]

F-5 was never meant to fly QFE ops so the altimeter design doesn't accommodate such low values. If you want to attack you set QNH and calculate all your altitudes based on known target elevation. Cranking altimeter to show height for the purposes of AG attack is not normal USAF technique. In the immortal words of Professor Farnsworth, "I'm afraid we'll have to use... math!"

[Mikaa]

When flying Acro at higher elevations with a standard altimeter, a lot of us will set a pseudo QFE + 1000, so ground level will indicate 1000’AGL. In RL you have to be extremely cautious, because if you’re not on your game, it can get you into trouble quick. It does, however, offer the ability for quick AGL references by subtracting 1000ft rather than doing harder math while upside-down in the box.

 

Maybe try this for ground attacks by figuring out QFE for your target, and then add one “Hg to bring it within the capabilities of the Altimeter. There’s not much else you can do with the limitations of a steam gauge ALT.

[Bananabrai]

Good to know. I will use QNH then and do the math.

Not a problem for me, I just was curious.