An angel at my pad (Keck hospital rooftop crash)
 

Thankfully no injuries and the organ they were transporting was still useable.
Thankfully it didn't fall off the building.

Anyone know how it ended up on its side?

https://www.dailynews.com/2020/11/06...pital-helipad/
https://cimg5.ibsrv.net/gimg/pprune....e19344f4c1.png

skadi

Looks like a TR drive failure from the witness video

another angle

https://www.liveleak.com/view?t=9PUrn_1604775586

I'd agree that looks like a T/R drive failure at the most critical stage of the landing. Looks like a quick and correct response by the pilot, namely by lowering the collective, bearing in mind there was little or no time to shut down the engines. Quite interesting to see how rapidly it rolled!

Glad to hear they all survived.

The second video classed it as a "hard landing"!

I was wondering whether the pilot had induced the roll in trying make sure of reaching the roof whilst yawing. Hard to control attitude and track once the yaw has developed.

Got it where it needed to be, all lived 👍

Sure that this was a TR drive failure? I saw a longer video of the approach and the TR RPM didn't change during final and beginning of the rotation .

skadi

Is this the same heli type that crashed in Leicester two years ago and if so, could it be the same issue?

The Leicester aircraft was an AW169. This was an AW109.

T/R rpm looks steady..maybe los of tail rotor authority...what is the Density Alt etc?

If it wasn’t a driveshaft failure it must have been a hard right pedal input, or control runaway. It’s difficult to tell if the tail rotor rpm changed because we’re not watching in real time and camera frame rate masks what’s going on.

As per the previous post, the aircraft are totally different types (169 versus 109) and their tail rotor control systems are totally different.

Golly, you guys must be subject matter experts on the 109 Series TR Control system to be so sure of what happened.

DA pretty much sea level.

Yep - just watch the video and pull up a comfy armchair.....

The initial slow rate of rotation at loss of directional control does not look like sudden TR drive failure to me.

have you seen the video in post 4? I wouldn’t call that slow - it’s gets real busy real quick!

It wasn't slow by the time it got to complete the first 360, but the rate of rotation for the first 90 does not suggest to me sudden TR drive failure.

Having carried out a ‘Check A’ on the 109 every working day for the last decade and a half and having over 3,000 hours on type, I do have some idea of how the thing is put together.

One other “gotcha” on this type is that out of the two hydraulic systems, only #1 boosts the yaw servo. If #1 hydraulics drop off line, servo assistance is lost and the pedal feedback forces can be very high. It’s then very difficult to apply enough “boot” to keep the aircraft straight at low speed. The normal way to land in that condition is a running landing at about 30 kts, ideally with a crosswind from the left.

Going by the strange (oil) mess on the helideck, this makes the most sense.