Bug in packs-off procedure?

[disco79stu 15]

*** Button control ***

Hi. I just had a strange behavior when I tried a packs off takeoff:

Packs were off (set on the DEP page), I performed the take off. After "positive rate" I pressed the button to command "Gear up" (as usual), but the PM did not do anything. 
Then after a few more seconds (without me doing anything), the PM said "packs on", switched on BOTH packs and then said "Gear up" and retracted the gear. (SmartCars shows "Gear lever raised at 902 ft").

Did I set or do something wrong? 

 

Stu

Edited February 25, 2020 by disco79stu

[byork 2,259]

It's not a bug.

You forgot to enter the Thrust Reduction altitude on the Departure Brief page 🙂

That's why things go thrown out of whack.

 

 

[disco79stu 15]

Oh I see! Thanks!!  I usually skip setting this. 🙂 

So if done correctly, the PM will switch on Pack1 at ThrRed and Pack2 after flaps up? 

EDIT: it works as you said, though he's switching on both packs after another when reaching ThrRed height. I always thought the leave more time in between, but I guess that's airline dependent...

Edited February 25, 2020 by disco79stu

[byork 2,259]

Airbus standard is to turn on the 2nd pack I recall 10 seconds after pack 1 is turned on.

Some airlines do it later.

I'm pretty sure I have a config option so you can chose which way you want it.