Delay in case of a go around after wheels touch down. Probably synchronized with when Williams engines go from flight idle to ground idle when WOW. 2 second delay.

Just guessing here.

Test pilot I spoke with in February said that the lift dump system deploys in stages based on wheel rotation and then weight on wheels sensors. In the video, the outboard spoilers deploy first (at wheel rotation), then the larger inboards. I understood it to be automatic, or the pilot could set it to automatically deploy. I presume the pilots in the video were easing it on which probably delayed the weight on wheels from activating the larger spoilers.

I would be very surprised if the FADEC and lift dump are interconnected. That will create some weird fault coupling that Pilatus would want to avoid in certification.

In any case, the videos show a delay of 5-6 seconds, not the 2 second Williams ground idle delay, or an 8 second delay which I thought was an alternate choice for the Williams delay.

Seems longer than necessary especially given the braking you do early in the roll out makes more difference than any other time.

Mike C.

That airplane is just friggin cool.

I love that they gave the mains dual wheels. Sure it's another set of wheels and tires, but it's also much better braking, and provides a little cushion to avoid loss of control with a tire blown.

95% of off field operation that you will see this jet. Its mostly dirt strip in Australia to gravel strips in Northern Canada and grass field anywere else.

I dont see anyone operating this jet in unprepared airstrip.

Its not a Super cub or a Maule.

If I'm seeing things right, this looks like an "unimproved" strip that they bulldozed at a normal airport.

The plane is cool, but hardly unique for a jet on dirt. Our Lear 24 was operated on gravel and dirt strips with a "gravel kit."

Lear 24 is old, any of the newer jets approved on dirt?

Is the gravel kit still available from Cessna and approved on newer M2, CJ2-3 or 4?

Shouldn’t this be in the Backcountry Flying thread?

CJ4, limitation, paved runways only.

Sometimes the limitations are modified by supplements.

I believe Mustang was like this, paved only, but had a turf supplement later added.

Indeed, presently the PC-24 AFM likely says paved only, and they have promised to removed that in the future.

I'm not aware of any movement on the CJ4 towards non paved runways, however.

Mike C.

First jet you can load mining equipment into with a forklift though

I was about to say that's silly, but on second thought you're right - not a forklift in sight

I was about to say that's silly, but on second thought you're right - not a forklift in sight