If anyone was wondering what an ADG looks like...

I've been on test flights when it was dropped. Insane how loud it is in the cockpit!

I've been on test flights when it was dropped. Insane how loud it is in the cockpit!

Very cool. Constant Speed drive as well?

Are you seriously power crippled with that as last resort?
Airspeed / icing limits?

If you have to throw that out your are already having a really bad day!

The ADG generator puts out half the current compared to the engine and APU driven generators so you are down to the AC essential buss only which drives the DC essential buss. Unlike some ADGs there’s no hydraulic pump on this one as it relies on one of the electric hydraulic pumps and subsequently only one of the three hydraulic systems will work. I wouldn’t say you are seriously crippled. The one hydraulic system that’s powered is the largest, so you don’t lose much there. You still get normal gear extension. All the anti-ice works except you will only get the pilots left side window. Naturally the ADG impeller has no anti-ice so you’d be in trouble there. Probably the biggest impact is the loss of autopilot and all of the right side radios, screens, and instruments. The older ADG had airspeed limits, but this one does not. IIRC this one still does flaps while the older one didn’t, but we didn’t test that on the drop.

I've done a few of those myself as well. I can't imagine the noise it would make if you dropped it at Vmo.

If your autopilot stopped working, I believe that you had something unpowered that should not have been.

Would it really be that much louder? The RPM has to be the same at any speed so I wouldn't expect the prop noise to change much. Or is most of the noise coming from having the door open?

Would it really be that much louder? The RPM has to be the same at any speed so I wouldn't expect the prop noise to change much. Or is most of the noise coming from having the door open?

Is there a Time in Service limit on that thing?

Like if you have a bad day and it is used for say 45 minutes to get back to pavement do you just tuck it back in and call it good while fixing the other issues?

Or does it require some painfully expensive overhaul at opportunistic times?

T

My recollection is it takes special tooling to restow it, and maybe that also includes some maint due to the use. This is for the 601 at least, not sure about the Globals.

NDT before stowing and it’s stowed via a hand pump in the nose bay.

It's loud. Very loud.

Ben

My recollection is it takes special tooling to restow it, and maybe that also includes some maint due to the use. This is for the 601 at least, not sure about the Globals.