PFD CAM : Climb Phase

[makirigermany]

from 17.000 to 35.000 in about 5min...=D... whats up there??

[CowBonbon]

@makirigermany

Why not? The lower the IAS at the same Climb-Thrust-Setting, the higher the Climbrate can be. With this Climbrate you can reach your Initial Cruise Level very fast and the faster you reach your Cruise Level you will save Fuel burn because the lower Windpressure at high Altitudes.

[sid17391]

hmmm climbed to 35000ft from 17000 in 5 mins?? at around 270 kts????

[kamyil]

Hi Sir. Brilliant video yet again.

1. Why did you not fly around the bad weather that appeared on the screen.

2. what determines whether or not you fly through turbulance or go around it.

Many thanks! Keep the videos coming.

[lzd772]

1. Too widespread. Anyway it was a layer of cloud, not a thunderstorm cell.

2. The severity of the weather returns. The returns were mostly green so it would not be too bad to go through it.

[spongebobbignob]

Ok cheers - i`ll try experimenting with that and hopefully get the hang of it a little more.

[spongebobbignob]

Hi lzd. Thanks for keeping these vids coming. Just one question. Can you explain what determines the aircrafts rate of climb or descent when in FLCH mode. I fly the PMDG 737`s a lot and can never really understand or anticipate what climb or decent rate the autopilot will take when in this mode. Cheers

[lzd772]

There are alot of factors. Temperature, air density, current altitude, aircraft weight, speed....

Basically, climb thrust will be maintained and the rate of climb or descent will depend on what speed is maintained. To help you understand, try this. Fly at ECON speed and do a step climb using FLCH. Note the ROC. Now, fly at MAX RATE speed (found on VNAV CLB pg and it's usually around 220 kt) and do a step climb. Note the ROC

[slionboy]

In fact, in the PSS777, after reaching 10000ft during descent, the ROD starts to slow down a lot, from -1200 indication on the VSI to -200VSI.

Then I was forced to use either FLCH or the V/S.

Do you have any idea why? (Probably settings in VNAV etcs...)

Thanks?

[lzd772]

Not sure..what does the FMA indicate?

[slionboy]

Thrust IDLE | VNAV | LNAV

PSS didn't programmed it to be Thrust IDLE during descent, it only say spd. but I believe in normal descent it should be Thrust IDLE right?

[lzd772]

I think there's a speed limit of 250 kts at 10 000 ft. So VNAV will almost level the plane off to reduce speed. Have a look at VNAV pg to see if there's a speed transition entered. You can delete it.

[slionboy]

Hm, But I didn't enter a speed transition unless you are talking about the default 250/10000 entered automatically by the FMS.

But the funny thing is that it is already at a fixed speed and don't require it to level off but it is still descending slowly.

[lzd772]

Yes, I was talking about the default one. You can delete it.

Well, then I'm not sure why it behaves like this. Perhaps you can check with the experts like jim or R1door

[RixceU]

Hi lzd772,

What is the normal FMA for descent in the T7? Until when does the thrust stay on IDLE (eg. when does it go to SPD)? If it is on IDLE and VNAV PTH, what controls the speed? (PSS doesn't have it right as it always uses SPD mode during descent as slionboy mentioned)

[lzd772]

If VNAV PTH is used, you'll see SPD change to IDLE on descent. Once the thrust levers are at idle, it changes to HOLD.

It'll change to SPD whenever thrust is commanded to maintain the target speed.

On IDLE and VNAV PTH, speed is not really controlled. Autopilot adjusts the pitch to maintain the desired descent profile and autothrust remains idle. Actual speed can 'run away' from the desired VNAV speed, especially if the aircraft is high on profile.

[RixceU]

Thanks. PSS is pretty off for VNAV descent then...

I saw on PFD Descent videos that sometimes VNAV PTH changed to VNAV SPD for a short time and then back to PTH. Does that happen if speed needs to be managed?

[lzd772]

Yes, SPD intervention is used (i.e. opening the speed window by pushing the speed knob) when the speed 'runs away'. When that happens, VNAV SPD is annunciated.

[IRAQ4EVER95]

what plane is this? XD 737 maybe?

[sirlaps]

5 stars!

looks exactly like pmdg ;)

[patrickcramer]

sadly pmdg doesn't has a 777 :(

[EdwinLee2001]

lzd772, fantastic video as always! May I know which airport you were taking off from? Also, there was some ATC chatter around the 6:00 mark, was that aimed at you? I seem to hear Singapore ___ x-ray charlie, why no flight number? Training or ferry flight?

[venichen1]

wat is the climb rate? looks fast.

[tomohawk46]

As usual awesome video Izd. can you tell me why you slow to 270knots from 300knots? was this due the weather or procedural?

[lzd772]

Yes, weather. Makes the ride slightly better and that speed gives optimal maneuvering margins during turbulence.

[Qantas25]

Is there a minimum angle of attack at which the seat belt signs have to be on? Such as 10 degrees nose up etc?

[lzd772]

No.

[Qantas25]

Whoops. I meant to say maximum, apologies.

[lzd772]

Well, when pitch attitude is in excess of 10 degrees, people will have alot of difficulty walking in the cabin

[immerrocknroll]

Wow, what a climbrate. I gues you won't contact radar but mission control lol

[skyranch05]

As Always, Amazing vid Izd! your a true inspiration......

[OELEU]

always lovely.. :)