Environmental Control Panel - Bleed Switch

[kityatyi]

According to the normal procedures, the BLEED SWITCH is to be set to the AUTO position.

It would appear to me that the cabin only warms up with the switch set to the HI position, otherwise, the cabin will become cold at high altitudes or in cold weather.

In other words, the BLEED SWITCH set to AUTO does not allow the cabin temperature to increase.

Is this normal/realistic?

[sg_aviation]

BLEED in AUTO can keep the cabin at room temperature up to outside air temperature of approx. -30°C which matches approx. FL240 in ISA. Anything below requires BLEED set to HI, which decreases engine performance. You may also want to use HI in order to expedite warming of cabin out of cold temperature, however on the ground it will eventually also work in AUTO.

[kityatyi]

Thanks for your input, I will experiment!

[Mad_X]

Engine performance decrease unfortunately is not modeled yet but the ITT rise is.

[quba]

@Mad_X I thought the engine performance decrease mostly results from that ITT increase, because then you can't push your engine as much. Or should there me even more pronounced effect of BLEED HI?

[Mad_X]

@quba good question, I understood that there should also be a reduction in the torque achievable but your explanation also makes a lot of sense in the way that does to the ITT raise you have to lower the power - as you said.