B737-300/-500 engine start question
B737-300/-500 (CFM56-3) engine start, no starter cutout at 46% N2. Otherwise normal engine start. For some reason the CPT doesn't command the start switch to be moved to OFF but cuts the engine start lever.
In my understanding the starter connects via a centrifugal clutch to the engine shaft. When there is no starter cutout the starter disconnects from the shaft at 46% N2 but accelerates to max rpm as there is no load on the starter. When you now cut the engine start lever and the engine spools down below 46% N2, the centrifugal clutch reconnects the starter leading to mechanical desctruction of the starter.
Am I correct on this behaviour or am I fooled by my mind? I have a faint memory of reading about it during my typerating years ago but can't find it anymore. Can someone shed some light on this topic? Any clarification is appreciated.
Regards,
Badente