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Old March 8th 07, 04:10 AM posted to rec.aviation.piloting
Peter Dohm
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Posts: 1,754
Default Lost One Yesterday

That is pretty much my take on light twins. If you lost an engine on
takeoff at low altitude you are better off chopping both throttles and
landing it. Only turbine twins typically have enough power to climb
out on a single engine without having to operate near VMC.


Do they have enough power to get safely above VMC, if the nose is brought
down, so only a 100 or 200fpm climb rate is achieved?
--
Jim in NC


I left this question wait until evening, mostly in the hope that one of the
multi-engine instructors on the group would pick it up and respond--so as
not to leave it for a lowly former student pilot. (sigh)

In any case, the answer to the question as specifically phrased is probably
"no". However, that may be trivial, since AFAIK it should mainly apply in
the special case of a "go" decision with an engine failure at rotation--many
twins be flown successfully from that situation and the parameters should be
covered in the POH. My recollection is that is was covered for the 301D, as
an example.

There are some considerations:
1) For most light twins, V-speeds are only published for maximum
permitted weight, but will actually vary with weight and CG.
2) For most light twins, VMC is only published for standard sea level
density altitude, but will vary with density altitude.
3) Light twins are not required to have a single engine ceiling above
standard sea level, although many do. However, twin owners are generally
quick to point out that a twin with one engine operating will typically have
a favorable "drift down" profile when operating above the single engine
ceiling.
4) Some (perhaps many--I don't know the statistics) light twins have a
best twin engine angle of climb speed less than VMC, and some _may_ have a
best twin engine rate of climb speed below VMC as well. (That possibility
scares the crap out of me!)

In the scenario suggested by the question--of an in flight failure at VMC
during the initial climb--it would probably be necessary to lower the nose
sufficiently for a 100 to 200 fmp NEGATIVE climb to achieve the best rate on
climb speed. It could also be necessary to temporarily reduce power on the
operating engine in order to regain yaw control--especially if you were not
VERY quick with the rudder.

The best source that I know of for good information on the actual correct
procedures is to attend one or more of the FAA seminars. The so-called
"Pilor/Controller" forums are frequently hosted by the local Safety Program
Coordinator for Flight Standards--who are very accomplished pilots in
addition to their other qualifications. They really are the ones to ask,
and they are not involved in enforcement during the years that work as
Safety Program Coordinators.

To find an event near you, visit http://www.faasafety.gov/SPANS/default.aspx
and enter your zip code and the distance you are willing to travel. You
will gain excellent information, meet your fellow pilots and enthusiasts,
and also be elegible for credit under the "Wings" program.

Peter