Air restart in PA30

Dennis O'Connor wrote:

The tip is to never shut down a good engine in flight... You can test the
feathering on the ground - that is how the mechanic / prop shop does it...
If the engine actually fails in flight there won't be a restart anyway so
there is no defensible reason to put the plane at such risk, for no
reason...

Testing it on the ground won't really 'prove' that the props will feather when
you need them to. You need to put them up in about a one-hundred mile per hour
slipstream to do that.

Anyway, there are good reasons. After my newly overhauled engines (and one new
prop) had about two hundred hours on them, I felt it was time to verify that the
props would feather as advertised. On a nice VFR day, with plenty of alittude
to work with and near an airport, there is nothing wrong with doing this. Leave
the family on the ground, though.

The engine SHOULD restart successfully, but don't count on it until you've
proven them out.

Engines are also routinely shut down and secured in multi-engine training.

-Ryan
CFII-A/MEI/CFI-H