Tiger tail?

[Foxcow]

I was reading a United FO's write up of their dealings with a mountain wave. He described it as "the slowest speed you want to be at…prior to stall but at a pitch/speed where the airplane will start taking action for you"

They were at 13-14 degrees pitch up, throttles fully retarded, 15kts overspeed, and climbing at 7,500fpm!

Can anyone elaborate on this?

 

[C650CPT]

I've encountered mountain wave a few times in the hight 30s and low 40s, but never like that. You can feel the airplane lift or drop in the wave and you have to anticipate power changes as you can easily over speed the airplane. As you lift airspeed bleeds off ... never was concerned about stall ... and on the drop it rapidily increases. You just do your best to maintain assigned altitude and control airspeed with power changes, it has been bad enough that I've reported it to ATC as moderate and once as severe and requested block altitudes. A key in dealing with mountain wave is to monitor the frequency and listen to what other pilots are saying / doing about it.

Jim

 

[Foxcow]

I found out what it was. Its the barber pole thing that indicates a stall on the bottom of the airspeed tape on the PFD. It is a heavy broken red line that looks like a Tiger's tail