Why did this helicopter crash ?

SEAN,
I DIDN'T MEAN HE ROLLED OFF THE POWER, ONLY THAT HE LOWERED COLLECTIVE
TO FULL DOWN TO COUNTER THE LOSS OF TAIL ROTOR. BUT HE MAY HAVE ROLLED
OFF POWER (WHO KNOWS) BUT THEN HE HAD TO ROLL POWER BACK ON BEFORE HE
PULLED IN POWER(COLLECTIVE) AGAIN TO ARREST HIS DESCENT AS HE NEARED
THE ROOFTOPS. THEN HE GOT THE SEVERE YAW AGAIN. IF HE DIDN'T HAVE THE
POWER BACK ON WHEN HE PULLED COLLECTIVE THE BOTTOM WOULD HAVE FELL OUT
OF THE SHIP VERY QUICKLY AND HE WOULD HAVE PUT THAT SHIP THROUGH THOSE
ROOFS INSTEAD OF ON TOP OF THEM.
REGARDS,
MARK (ANDY IS MY MIDDLE NAME)




Sean Trost wrote:

ummn Andy,
Correct me if I'm wronge but if the helicopter is in an auto then the
rotor is disengaged from the powere source, hence no tourqe to induce
the yaw when the collective is pulled.
all the best
Sean

helicopterandy wrote:

"Ove" wrote in message
...

Maybe a hydraulic failure (lost the pressure) ?

Ove
"Iwan Bogels" wrote in message
...

Hi everybody,

This week I have uploaded a video of a helicopter crash on my website
(www.dappa.nl/crash.htm). Does anyone have a clue about the failure
that
caused this crash? It is definately not an engine failure or a tail
rotor
failure, but it still looks like a spectacular decend.

For the sensitive viewers: Nobody got hurt, but the helo is a complete


write

off.

Iwan Bogels
DAPPA




Sorry for the multiple posts here. But on my first reply I meant to
say after he began the auto he had to pull collective when he neared
the buildings rooftops and he obviously didn't have any tail rotor
thrust to manage that collective pull. Notice how the heli yaws when
he arrests his descent. Read the initial NTSB reports.