[quote][b][url=/v3/forum/questions-g%C3%A9n%C3%A9rales-et-techniques-41/topic/red%C3%A9marage-441/?post=7130#post-7130]little boy[/url] a dit le 03/09/2006 à 17:50 :[/b] pour de ce qui est des IFSD pour les appareils commerciaux celà s'applique lorque les deux canaux FADEC sont hors service (contrôle réacteur, gestion de la poussée, séquence de démarrage........), et en cas de problèmes c'est la procédure ENG SHUT DOWN qui est engagée. les IFSD sont extrêmement rare est doivent l'objet d'une déclaration aux autorités. le moteur le plus sûre pour lutter contre ce genre de problème est le CFM 56 qui ne connait que 3 arrêts moteur par millions d'heures de vol. une compagnie hongroise dispose même d'un réacteur CFM 56 qui a cumulé plus de 38 000 heures de vol sans être démonté. source: http://www.safran-groupe.com voilà la procédure pour le CFM 56: "Retard throttle slowly and smoothly to idle. NOTE: Gradual power reduction to idle during voluntary shutdown promotes thermal stabilization before fuel shutoff. Operate engine at idle for 3 mins if feasible. Airstart attempts may be made following a voluntary shutdown at any altitude and airspeed; however if the start cannot be achieved, establish flight conditions within the airstart envelope. Warning: Be prepared to abort the start if a rapid EGT rise occurs, approaching starting limits -Light off normally occurs within 2 to 3 seconds after placing the fuel lever in the ON position. Observe same EGT, Fuel flow and RPM limits as for ground start . -If the light-off does not occur within 30 seconds, abort the start by returning the fuel lever to the OFF position. Let the engine windmill for 30 seconds to purge the combustion section of residual fuel before attempting another start. -Starter off at 50 percent N2 -When the engine stabilized at idle N2 (a) Oil pressure…………Check (b) Ignition off…………..Pilots discretion -It is recommended that the engine be stabilized at flight idle for 3 minutes prior to high power application following an airstart. Windmilling Restart Procedure Caution: Starter assist should be used if N2 is below 15 percent. If a windmill start must be attempted at less than 15 percent N2 because of starter unavailability, a Hung Start or Hot Start may result. Increasing kias will increase windmill speed. Airstarts in most of the starting envelope require starter assist due to the low windmilling characteristics of the engine. RPM Hang-up During airstart During airstarts at high altitudes and low airspeeds, rpm hang-up may be experienced after obtaining initial light-off and acceleration. The hang-up is characterized as a stabilized engine speed lower than idle, with no response to throttle advancement and may be the result of either too rich or too lean fuel scheduling, low airspeed or excessive altitude. Operating Procedure For Abnormal Condition (Section 6) No Start - If it is noted during a start procedure that a no light-off is indicated within 10 seconds after fuel is applied, the start procedure should be discontinued. -Before attempting a second start, dry motor the engine for 60 seconds for ground starts or windmill for 30 seconds for airstarts. Use alternate ignition system for second start attempt. (Observe starter limitations) Note: CFM International does not supply the starter or thrust reverser for CFM56-3B-2 Engines on the 737-400 aircraft. The BOEING company will determine and supply the starter duty cycle limits, starter re-engagement limits, and starter air pressure requirements ,etc. which are compatible with the engine, for the 737-400 Aircraft Flight Manuals. -If the second start attempt fails, no further start attempt should be made before the cause of the start failure has been determined and corrected (ground only). -If the failure to start is attributed to either ignition system, it should be recorded in the Aircraft Log, investigated and remedied at the earliest opportunity" source: http://www.b737.org.uk/cfm56_soi.htm et ici pour de ce qui est de la propulsion: http://findarticles.com/p/articles/mi_m0FKE/is_8_48/ai_108312273[/quote]