I've got some ACBs set up which are meant to improve redundancy by disabling thrust & turning if it loses one engine, keeping it in the air but stationary. Try disabling those if you're having trouble with just the Steadfast, because that's its unique feature. The ACBs are either in the AI box, one of the engines, or near the bridge.

I keep having an issue where the Steadfast turns itself off mid-air and plummets into the water below, I basically have to babysit it during fights... do you know what could possibly be causing this?

Okay thank's

They all use helium pumps, but all they do is make it a bit cheaper to fly. All of my airships except for the bases rely on regular jets controlled by a breadboard PID for lift.

How do you keep the airship in the air? Only with helium pump or with other methods.

Awesome as usual.