On Sun, 23 Apr 2006 21:06:12 -0500, "Jim Macklin"
wrote:

That's is true, but except for the Beech 18, are there any
HS props on an airplane under 12,500 pounds?

The feathering on the HS is a electrical relay that turns on
a high pressure pump that operates at a pressure above
governor pressure. The Prop is feathered and the pump shuts
off. To unfeather the button is held in so the pump
continues to run and that causes the internal valve to move,
re-routing the oil so it unfeathers.

Heh. I typically "cycled" a freshly o-hauled HS to feather and back
static, then started the engine and function-checked it after
installation.

Got really busy one afternoon/evening, cycled the prop, but didn't get
the test run in. Aircraft in question got dispatched on a last minute
run-and I got a phone call @ 3:00 am.

Line guy hopped up on the wing and topped off the oil tank (to
replace what I had pumped into the engine). When the plane arrived at
its destination, the pilot attempted to check the oil-took the cap
off, oil started running out, cap back on, called home and asked for
help.

Was also a really pretty fan-shaped spray pattern of oil on the ramp
where the run-up was done prior to the first departure.

I wonder many pilots will take this to heart and open their
POH to the systems section?

In this forum, probably quite a few.

TC