Un rapport sur un accident d'un Beech 200 King Air, VP-BBK le 23 December 2000, dans les mêmes circonstances:
https://assets.digital.cabinet-office.g ... 022814.pdfUne des causes probables de ce crash serait un mauvais réglage du frein de manette de puissance moteur/pas d'hélices. Une fois la main du pilote retiré des manettes, l'une d'elle se serait déplacée à réduire, faute d'un réglage du système de friction suffisamment ferme, entraînant une dissymétrie de puissance droite gauche. Il y avait du brouillard également. S'en serait suivi une désorientation du pilote.
Citation:
Conclusion:
Whilst the CVR does not provide any comments by the pilot as to the problems he was experiencing,
spectral analysis of the CVR recording indicates that a significant difference in propeller rpm occurred at rotation when the pilot would normally have removed his right hand from the power levers.
There was no evidence of a malfunction in either engine or the propeller control systems thus it is probable that migration of a power lever(s) occurred due to insufficient friction being set on the power lever friction control. The fiction control had been slackened during recent maintenance and it was possible that it was not adjusted sufficiently by the pilot during his checks prior to takeoff. His simulator training had included engine failures but as far as could be established, the pilot had not encountered or been trained for the situation of power lever(s) migration during takeoff.
With his level of experience the pilot should have controlled the resultant asymmetric thrust and in reasonable
conditions continued the takeoff to a safe height where analysis of the problem could have been
carried out. In the event the takeoff was carried out in extremely low visibility conditions leading to
the pilot's total loss of any ground references within seconds of lift off. Having controlled the aircraft
initially the lack of visual reference with the ground, possible confusion with attitude instrument bank angle display, physical disorientation brought about by cockpit activity and confusion as to the exact nature of the problem led the pilot to lose control of the aircraft at a low altitude.
The unusual attitude developed by the aircraft and the reason for the power asymmetry may have been recognised by the pilot several seconds before impact however there was insufficient height available for him to effect a safe recovery. The transition from visual to instrument flight in the low visibility conditions existing at the time of departure was considered to be a major contributory factor in this accident.
Cockpit du Beech King Air 200:
http://www.figueroa.net.br/Manuais/BE200.pdfLes réglages de friction des différentes manettes: