Why did this helicopter crash ?

Sean,
SORRY IF I CAUSED YOU TO MISUNDERSTAND MY EXPALNATION. I MEANT THE
PILOT OBVIOUSLY LOWERED COLLECTIVE TO FULL DOWN TO STOP THE YAW FROM
TAIL ROTOR FAILURE. NOT FULL AUTO. HE MAY HAVE ACTUALLY ROLLED OFF
THROTTLE TO SPLIT NEEDLES THOUGH I DOUBT IT. HE PROBABLY JUST WENT
FULL DOWN UNTIL NEAR THE ROOFTOPS WHERE HE HAD TO FLAIR AND PULL IN
SOME COLLECTIVE. THAT'S WHEN HE GOT THE BAD YAW DUE TO THE FACT HE WAS
ADDING POWER WITHOUT ANY TAIL ROTOR THRUST.

Sean Trost wrote in message ...
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.