NTSB Prelim:

https://www.reddit.com/r/NTSB_database/comments/sbq6he/1_minor_3_none_january_11_2022_era22fa105/

Was mentioned. But nothing about barrel roll. Who was the one to start the barrel roll rumor?

in line rolls, snap rolls, no one cares - in the instance witnesses say what they can to characterize what they see.  

Non event.

A helicopter performs aerobics not induced by the pilot, ends up in a pile of non-useable parts & you call it a "non-event"? So I guess WWII was a skirmish.😂🤣

Belligerent ASH HOLE.

Get a grip youngster.

"The helicopter rotated along its longitudal axis multiple times" according to someone on the ground...

The medical crew said they were "pinned onto the roof"... Was it low G's or a sloppy barrel roll?

Only roll. Rolls around the longitudinal axis if a complete 360, would be an aileron roll, or cyclic roll. Barrel rolls are coordinated maneuvers around the longitudinal and lateral axes.

least someone knows the difference betwixt a roll and barrel roll.

What a bunch of amateurs in the helicopter aerobatic population.

From the report

"According to the flight medic, the flight was routine, and they were within 10 minutes of landing at 9PN2. He and the flight nurse were out of their seats treating the patient when a loud "bang" was heard, and the helicopter banked sharply right and continued into a right roll. The medic said that the helicopter rolled inverted, perhaps multiple times, and that he and the nurse were "pinned to the ceiling" and internal communication was lost. The helicopter was leveled, the patient was secured, the crewmembers secured themselves in their seats, and they braced for landing."

I understand the reddit post failed to use proper spacing, formatting and paragraph form making it easy to miss parts of the report if only scan reading.

u can't read between the lines and figure it all out?  It's a prelim, store it and carry on.  When the full report comes out check the differences and learn.

Geesh.

absolutely no sense.

Good progress..

I have no idea what happened

never investigated an accident for sure.  That word salad is pretty much the process.

 I don't know anything about EC 135's. Is possible to roll one intentionally or not and not have to negative G's cut off the tail?

anybody know the answer to that one

 Well.... some machines are known to fly in neg G such as the BO 105 must other machines are known to not tolerate any neg G such as any Bell product.

 I would guess the POH would have such info or Eurocopter would know. I would also guess pilots of the EC135 would know.

check the "POH"or ask a 135 pilot about flying it upside down lol

But I've seen a 407 do multiple loops and rolls.  Is that a bell product?

Guess Bell didn't build this 407 then...https://www.youtube.com/watch?v=DL6mI5iRy3g

?
https://www.youtube.com/watch?v=1MfFStR_fA8
?
If so, that isn't a loop.

a British Lynx.  That pushover is as dangerous as coming under 1 G in a loop if not handled properly.

positive g on the rotor and any helicopter will do it.  Suggest a course in FW aerobatics.

Decathlon is 140 knots. Entry "G" is 4 eased to 2 "G"s over the top. You would need 140 knots minimum entry to make it over the top with enough "G" available to keep positive "G" from 90 deg nose up to 90 deg nose down. You would have very little margins for error in the attempt.

omit one thing.  The collective is a 'direct lift device' that changes the game with respect to aerobatics as compared to the Decathlon (7KCAB?) which is where I started aerobatics, then on to helicopter aerobatics.

And collective in that fashion, it is not going to result in a traditional loop ie perfectly round. More of a quarter loop into a back flip.

grief!

Easy, truthfully.

Just because it rolled doesn't mean it had negative G's (it depends on how the roll was done).

ANY helicopter can roll...

https://www.youtube.com/watch?v=MQ7pVjQ5Y5g Sea Stallion

https://www.youtube.com/watch?v=q52KxdjXvJM Apache

https://www.youtube.com/watch?v=USmOqlj9Hag Blackhawk (semi-roll)

https://www.youtube.com/watch?v=QijetGUlJ4A Lynx

I've known a Bell 206 pilot who did a loop, and various old UH-1 and AH-1 guys who have done it (the Cobra guys did them from altitude in an aggressive right/left dive to inverted, so I guess that wasn't a full roll from level all the way up and around but seems like a roll to me).  So even tetering rotorheads can do it if you maintain positive thrust.

There was a video posted on this forum once of an R44 doing it.  It was grainy old phone video but it was very distinctly a roll.  It looked like he was trying to do a return to target and rolled it over accidentally.

Obviously, any articulated system can do it with ease as long as you don't reduce collective while inverted, which would take off the tailboom.

Cobra almost inverted:   0:37

https://www.youtube.com/watch?v=K157C4vLdoY

but the speed build up once the downward acceleration starts is quick and maintaining rotor rpm was interesting.

Cobra wingover.  Not a big deal.

First, it's a 4 bladed semi-rigid rotor system. This is not a 2-blade system. I don't see a mast bumping possibily with this helicotper ( flew an EC135 for almost 9 years)

2, they talked about barrel rolls.. that's not a low-g manuever

$h!t link. 

https://youtu.be/mjpTFxmGkus

go to 5:30 to watch a ec135 do a roll

that a roll, a barrel roll, a snap roll, a 4 point roll, an 8 point roll?

Good grief.

He was climbing fast and keeping positive g's on the rotor system and look how much altitude he lost in the manuever.  Imagine two sloppy unintentional rolls.  They would have been a smoking hole...

Interesting observation of the tr flexball cable wrapped around the mast.  Post impact event or flight event.  That cable runs inside the tail boom I believe so will be interested how it ends up around the mast

The cable runs inside the T/R Driveshaft cover (not the Tail boom) held up by 7 or 8 adel clamps at each driveshaft bearing support location, my guess is upon impact and tail boom separation the cable was loose and then wrapped around the M/R head while it was still spinning..

You just watch....

what are you going to do, call a cop

broke off in crash, exit one cable, willy nilly

around that spinning mast.

EZ Pee Zee.

I barrell roll the AStar every time I go IIMC in the simulator.. Easy