Sword a écrit:
SaveOurSouls a écrit:
CP1 : Les opérations...
La CP-1 est ...
En revanche
le sujet de la rétraction de la roulette de nez nous éloigne un peu..
Bien évidemment, cette remarque est même hors sujet:)
Un témoin, ex-pilote 58ans, rapporte dans la presse britannique qu'il a perçu l'aéronef moteurs coupés, et d'autres témoins décrivent un bruit de grincement et de frottement (métal contre métal).
Un cameraman de Sky sports, témoin aussi, décrit des "pièces étonnantes de machinerie au sol".
Un témoignage indique que les pales ont arrêtés de tourner.
- Donc, est-ce que l'arrêt des moteurs est volontaire, dans une procédure désespérée de lutte contre la mise en laçet?
- Ou bien, est-ce un défaut mécanique, une rupture, un blocage, un grippage qui a entrainé l'arrêt des moteurs?
Ce pilote présente ses 3 thèses possibles, pour l'arrêt rotor de queue:
- Une collision drone dans le rotor de queue
- Une erreur de pilotage
- Une défaillance technique, sa thèse la plus probable, [sur un aéronef de facture et de livraison récentes]
Si la thèse de défaillance technique se confirmait, s'ouvrirait les causalités liées à la maintenance, ou ou celle d'un, ou de composant(s).
http://www.thesun.co.uk/news/7603209/leicester-helicopter-crash-hero-pilotFormer Royal Navy commando Harry Benson, 58, believes Swaffer[leCDB] became stuck in a "dead man's curve", which almost always ends in a "catastrophic failure".
Sky Sports cameraman Dan Cox was horrified to see the helicopter "spinning out of control" moments after hearing the take-off.
Cox told Sky News: "I heard the helicopter coming out of the stadium, saw it as you do, they are amazing pieces of machinery and then I just carried on walking thinking next time I look up it is going to be overhead.
"The next thing I just looked up and it was just spinning, static just out of control, just a constant spinning, I have never seen anything like it."
He continued: "I don't know how the pilot did it but he seemed to manage to slow down the spinning rotation and it drifted off into the corner part of the car park."
http://www.dailymail.co.uk/news/article-6326849/Was-doomed-helicopter-stuck-dead-mans-curve.html... Witnesses reported hearing a ‘
grinding noise’ and then an
eerie silence as the engine of the AgustaWestland AW169 stopped in mid-air.
Ryan Brown, a freelance photographer, told BBC Radio 5 Live: ‘I heard the helicopter take off. I turned around and there was a
whirring and crunching sound and then it got quiet, it was out of control.
...
The blades had stopped spinning and then there was a big bang and a big fireball, and a lot of people ran to the scene when I came around the corner.’
... Harry Benson, a former Royal Navy commando helicopter pilot who served in the Falklands, stressed that it was far too early to say what caused the disaster.
But he said if the witness accounts are correct, there was a problem with the helicopter’s tail rotor. Its job is to keep the aircraft steady and stop it from spinning in the opposite direction to the main rotor blade.
‘It sounds like the helicopter was spinning. If that is the case then it is almost certain the tail rotor had gone,’ said Mr Benson, 58. He said it was likely the pilot got stuck in a ‘dead man’s curve’ which is almost impossible to get out of.
This is when the aircraft is flying too slowly and at too low an altitude to shut down the engines and perform an emergency landing.
Helicopter pilots
are trained to turn off the engine to stop the aircraft from spinning and then use the air moving through the main rotor blades to glide to safety.
‘If it was at low altitude and at low speed there would have been very little he or she could have done. The whole thing is too horrifying to think about even for experienced pilots. If the helicopter was spinning it would almost certainly the tail rotor going.’
...Jim Rowlands, a former RAF Puma crew member, also said the reports the helicopter was spinning suggested a problem with the tail rotor. He said
pilot error, a
collision with a drone or
poor maintenance could have caused the crash. But he told the BBC
his ‘gut feeling’ was there was a mechanical problem.