1. Power Lever---Idle
2.Props----- ****DO NOT FEATHER***
3. Condition lever---- Cut off
4. Conduct Air start procedures.
I fly a Twin Otter, which has the PT6's also. We don't have a similar checklist, but are told to feather both engines in the event of both engines failing. The AIRSTART checklist calls for the prop lever to be in the feather position prior to the start.
Now my question is regarding the Propellers in this case, the action expected is not to Feather the prop, wouldn't loss of oil pressure due to loss in engine power drive the prop toward feather in the first place?
Yes. With no engine oil pressure the springs and counterweights will feather the prop.
What is the significance of not feathering the prop, especially in the King Air engine which is a free turbine engine, so would being feathered or unfeathered make any difference in the ease of air start since the prop is not connected to the gas generator shaft anyways?
I would assume your AIRSTART checklist would be the same as the one in our Twin Otter, i.e. the prop would be feathered prior to the start.
BTW, the Twin Otter has Power, Prop and Fuel levers. No condition levers.
If the end result was to have both engines out, without a hope for either or both engines being restarted, you definitely want them both feathered to extend the glide...and that does make an enormous difference.