Lockheed Martin loops Hercules at Farnborough 2018
 

Isn't the video several years old???

yes, 2011, but the link has Paris 2017 and the title photos before the video.

Did not some Marine Corps pilots reduce a new airframe to scrap doing something similar? Iirc, it was a gunship version, so the bill was steeper than for a normal transport.
Guess for a pilot, it is always tempting to try something similar, but stuff happens...

This one? 10 characters required....

Why are you blaming the Marines for an Air Force mishap?

My bad. The Marines were not the guilty party, but rather the USAF.

Watch from 6:52

And a departure from controlled flight into an unplanned, inverted position and an overstress of the aircraft, is much different than a properly planned, properly executed, aerobatic maneuver within the limits of the aircraft. One is planned, the mishap was not.

Saw still pics of a 707 being barrel-rolled by a Boeing test pilot donkey's years ago. As with the C-130 loop, if he kept a steady +1G all the way round, should cause no extra stress on the frame., surely? .... The Pax (if any) might not like it, much, though !

Seems to be a trend here, when will we see the likes of A400, C-17, A380 or 777. ;)

I'm guessing at +2.5 (limit was +3.25 ish from (dim) memory) at the bottom and initiation, with a tad over 1 at the top (although the C-130 is stressed for a smidge of negative...again -0.75 I think).

Loop is perfectly achievable within airframe limits, assuming aircraft was within Vno1 table..which it would be when empty of freight....

We used to use a bit of <1g when trying to get the cargo door locked up in preparation for wedge loads (and the UK C-130s only had a single hydraulic jack on that door).......as many will remember......and is the source of my username....

Memories of the C-130J Project Structures meetings at Marietta came flooding back, with a chill down my spine to boot, watching that video. It was with some justification (and a great deal of respect) that the Farnborough structures expert was given the nickname Rottweiler. She didn't half keep the Lockheed chaps (most of whom spoke with Yorkshire accents) honest.

By contrast, those of us at RIAT this year expecting the usual rolls and loop from the RSV (Italian Test Centre) C27J were somewhat disappointed.

Their commentator stated it wouldn't be seen any more at the start of the display on Sunday :-(

Yes, seemingly the C-27J did not carry them out as the Italian Air Force does not perform such manoeuvres as part of its normal flying ops. Made it a very dull routine. Anyone remeber the Dutch Fokker F.27 from some years back?

And a very impressed Martian here on watching the LM-100J.

Would love to know how to do that???

The crew was from a test squadron and presumably was wringing out the airframe when it departed controlled flight. There was planning here as well, but perhaps some unexpected flight characteristics surfaced.

Remember the Dutch Fokker F.27 from some years back?
 

by https://www.flickr.com/photos/vzlet/, on Flickr

USMC does not operate a gunship version of the Herc. USMC does have the Harvest Hawk weapons kit which they can attach to C-130, V-22 and other airframes, and while this kit does weaponize their tanker/transports, it does not really turn them into a true gunship.

The mishap bird was a USAF bird undergoing testing for high slideslip angles. The pilot exceeded the slideslip angle and the was slow in applying corrections and then put in the the wrong correction. It was not a stunt gone awry.

There's also a neat trick at 12:14 where he lifts the nosewheel while stationary on the runway.