F/O Switching off Packs during Preflight

[Binford 3]

Good Morning,

is there any reason why the f/o is switching of the Packs during its Preflight Flow?

It's quite annoying when you are on a freezing cold airport and wondering why the aircraft not geting warm 😉

Greetings
Michael

[byork 2,259]

If the OAT is less than 20, FO will turn off the left and center packs.

Also, I think the Packs will be turned off if you have the Air Conditioning cart connected since you wouldn't won't multiple source of air in the system at the same time.

Cheers,

[Binford 3]

Hi Bryan,

thanks for the heads up regarding the external ac cart. That could be the point. Will try it next time.

Thx and Happy new Year,

Michael