Flashing number in HUD under altitude

Hi,

Sometimes under high load I see a number flashing under the altitude digits. Last time it happen to '29.29'. What does it mean?

Cheers

I've seen that. I think it was 29.92, so I assumed it was the altimeter setting. Don't know what causes it to flash up there though.

It it the barometric number and flashing I guess is an alert for a mismatch.

If the flight computer has a trans alt setting, that might be it.

In the b737 fmc u can set a trans alt and system will remind you if not not correctly.

I think it’s speed dependant, so you have the correct QNH for landing.

Hi,

 

 

Sometimes under high load I see a number flashing under the altitude digits. Last time it happen to '29.29'. What does it mean?

 

 

Cheers

What altitude are you flying at when you see that flashing? Is it at 18,000 feet and above? It could be an annunciation telling you to switch to standard baro of 29.92. Don't know though...just a theory. I'll have to fire up the bug and go test my theory. :pilotfly:

Just did a little test. Was going down with -15380 f/pm, alt was 8700, no rad alt selected. Speed 215. AOA 16.8 Flashing number under alt was 29.92. Was doing some crazy diving to replicate it.