Scary situation on rooftop-helipad
 

A B412 encontered severe vibrations after unloading a patient on the rooftop of the Innsbruck/Austria hospital.

Video:
Video: So trudelte der Heli am Klinikdach - oesterreich.ORF.at

skadi

Vauuuuuuu, lucky people...on board

that is much more than simple ground resonance....:eek:

Yikes. What happened next?

The pilot flew the helicopter to the airport of Insbruck...

skadi

:confused:

Resonance needs one vital thing to be classified as ground resonance...

I.e. The ground. This was airborne!

Looks like a partial loss of main rotor control.

Agree that it does not look like ground resonance. Bearing in mind that there appears to have been loading / unloading going on, could it have been an inadvertent control input or obstructed control??

After the lift-off there seems to be a phase of more controlled flight followed by a second big deviation???

Very scary...

OH

Reminds me of my first lesson when I was given the controls by the instructor:eek:

I bet there was a problem with the pilot and never in life could this be called ground resonance.

Looks to me like the pilot wasn't able to grab the controls right for a time. Reallys sure he and not a pax was initially on stick and pitch? May be they unloaded the doc and leaving the patient alone on the controls?

BTW, why do they unload the ship in the middle of a rooftop on full power?

Almost looks like a red blanket gets sucked out of the open door on the right and into the blades. I blew it up but could not tell clearly.

Edited to add: I slowed it down and now could look like red smoke....

Try like this.....
use: In externem Player öffnen
than put 200% size in Win media player
than slow speed down to 0,5
than you can see that all started with ground resonance
than main rotor rise up in front, and airframe follows
and after that was "fight" with pedals after collective wild rise up
:ouch:

That is a leased GHC 412 judging by the colours.....

Helipilots not engaged maybe?

Not familiar with the type - dont know how it flies without the helipilot engaged, but it does appear to behave a lot like many aircraft do when they take off with no stabilisation.
This would seem to fit with the ground resonance theory - if resonance hits, you would take off pretty quick, probably without time to engage helipilots, let alone do any other checks!

I'm with IntheTin, helipilots not engaged. Have a few hours in the aircraft and even with helipiots engaged was still something of a twitchy beast.

He took off without closing the doors or waiting for the people standing around to move aside, or turning the helipilots on. Ground resonance could be a reason for him doing that. Maybe next time he'll leave the hp's on, and maybe check up slightly on the collective instead of keeping it all the way at the bottom.

412 isn't that bad without the hp's turned on, no worse than a 76. You can usually hover both without scaring anyone and reach down and turn them on. Helps if you've done it once or twice before.

Severe Incident on rooftop helipad Innsbruck (Austria)
 

On 9th of March a Bell 412 of HELIAUSTRIA (Knaus) had a severe incident after landing on UNI Klinik Innsbruck. Does anyone of the community have an idea, what the reason for this rodeo could be? Media say something about "Ground ressonance". YouTube - hubi neu-1_146487[1].wmv

According to a newsreport the B412 showed no mechanical malfunktion/damage after the inspection at the Innsbruck Airport...

skadi

.
From the clip there is zero evidence of ground resonance.

The take-off (if you can call it that) lacked any yaw control and the initial cyclic response was inappropriate leading me to suspect that a) this was an unplanned take-off (collective inadvertently manipulated) or b) the pilot allowed his 7 year old son to make his first attempt at flying a helicopter.

S.

Dear Savoia,
just please watch carefully tail position against horizontal helipad, from sec 2 to sec 6 and reconsider your statement....

.
9A+ I'm sorry but I just can't see it. Even when I zoom my screen to 200% the clip remains the same size.

I guess we shall find out eventually!

S.

does anyone have a link to the video on youtube?