HazelNuts39
The zoom climb is not 'sustained'. In response to the PNF's "go down", the V/S is reduced from 7000 fpm at t=25s to 1100 fpm at t=49.
OK, I am working on just this bit of the graph.
From time = 0 to time = 25,
zoom climb took x seconds.
As I understand it, that was due to more than a single input to the SS.
Am I wrong about that?
It is my understanding that he sustained the climb, but am happy to be corrected.
We enter your graph excerpt at time = 50, after the PNF has alerted him to climb. He's still climbing (sustains his climb), altitude increasing (until stall, and then until momentum peters out).
For this excerpt of the graph, "zoom" climb probably wasn't an apt description. Thanks for that.
By your graph, at time = 105 to about time = 115, he lowers, and keeps lowered, the nose ... or is that the aircraft doing it for him? (See rudderrat's comment). He's moving the SS to get the nose down, or so it seems from the lines. (Even though he says he's lost control, which apparently he has not, at least not in pitch)
As displayed on the graph, his pitch corrections follow the SS graph, out of phase or delayed by a few seconds as the plane takes X amount of time to respond. This ain't an F-16, eh? (Where's gums?
)
As I read his SS movement, he is trying to maintain 15° pitch but is overcontrolling, like he was earlier in roll. Each time the pitch increases through 15° his SS moves forward, and backwards again when pitch reduces through 15°
.
OK, I see where you get that, thanks. Strengthens the idea that he's executing the low altitude shaker stall avoidance procedure.
From 90-100 seconds, he says "I've lost control ..." and goes all the way to full nose-up to counter the nose-down pitch rate.
And then starts walking the SS down, 90-100 seconds, orange line.
And the nose follows.
rudderrat:
I'd say the aircraft naturally wanted to lower it's nose as the speed washed off. It was only due to the PF's mostly nose up ss demands, aided by full nose up stab trim, that he managed to prevent it from lowering.
Thanks! That paints a slightly different picture for me, and makes aerodynamic sense.