Cherokee 180 run-up RPM
Jim Fisher
I have a '66 Cherokee 180. When I bought into it, I was told by my partners
to do the run-up at 1700 RPM. I trained in a Cherokee140 before I bought
this plane and I used 2200 RPM in it's run-up.
Well, a friend of mine just bought a same-year 180 and he was told by the
previous owner to run her up at 2200 RPM.
Sooo, what governs run-up speed and why is mine supposedly different?
Jim Fisher
PP-ASEL
North Alabama (MSL)
Ron Rapp
wrote:
I have a '63 PA-28-180 and the book lists 1700 RPM for the run up.
Paul
wrote:
I suppose it depends on the particular version of engine is fitted,
but for the 1977 PA28-181 I fly the run up speed is 2000rpm. Same for
a 1973 PA28-140 I used to fly.
Nick Funk
POH says mags checked at 1800 rpm drop should not exceed 125 rpm or 50
rpm of each other.
Vacuum checked at 2000 rpm and shoud be 5" Hg plus or minus 0.1" Hg.
But Avtech's check list for this plane says to do runup at 2000 rpm with
the same max drop and max diff on the magnetos.
So take your choice.
Jim Fisher wrote:
>
> Howdy,
>
> I have a '66 Cherokee 180. When I bought into it, I was told by my partners
> to do the run-up at 1700 RPM. I trained in a Cherokee140 before I bought
> this plane and I used 2200 RPM in it's run-up.
>
> Well, a friend of mine just bought a same-year 180 and he was told by the
> previous owner to run her up at 2200 RPM.
>
Yoram Solomon
checked at different RPM. Your POH (updated if engine was replaced!) should
tell you, and nobody else!
Yoram.
Jim Fisher <Varsi...@aol.com> wrote in message
news:bF9g4.5733$pb2.4...@tw11.nn.bcandid.com...
HLAviation
>rpm of each other.
>Vacuum checked at 2000 rpm and shoud be 5" Hg plus or minus 0.1" Hg.
>
>But Avtech's check list for this plane says to do runup at 2000 rpm with
>the same max drop and max diff on the magnetos.
You should do the mag check with a minimal load that still requires both mags
to fire fuel fully (therefore giving the mag drop). The reason is to minimize
the effect of of the "pop" you get if you do have a problem. That pop is from
fuel that didn't fire getting inot the muffler and getting ignited when the
other mag comes back on line. I've replaced a lot of exploded mufflers from
people accidently turning the key Off while doing a mag check at high power.
BTW Mufflers are expensive. I'd use the 1800 the POH for the plane recomends
as that is "The Official Method". BTW, Never use an aftermarket checklist on a
checkride unless it corresponds with the POH checklist Exactly.
Jim Fisher
engine came from (don't have engine logs in front of me now) but I'll check.
I assumed, until now, that it came from the Piper factory but I'm having
seconds thought now.
The plane came with a '73 Challenger (!) handbook so I ordered an original
'66 180 handbook. That's part of my confusion 'cause that POH says 2000 or
so if I remember correctly.
Yoram Solomon <sol...@worldnet.att.net> wrote in message
news:85tta9$39n$1...@bgtnsc01.worldnet.att.net...
Ron Natalie
Jim Fisher wrote:
>
> The plane came with a '73 Challenger (!) handbook so I ordered an original
> '66 180 handbook. That's part of my confusion 'cause that POH says 2000 or
> so if I remember correctly.
>
That's very bad. Even though older plaines aren't required to have POH's
directly, you have to be very careful. Some of the reqiured operating
limitations are expressed in that book. Operating the plane without the
proper book is not legal.
Just for real jollies, my Navion POH calls out three different speeds
for the runup. 2200 to cycle the prop, 2500 to check the mags, and
2000 to check the carb heat, plus an optional static power check
at 3250.
Jay Honeck
Jay Honeck
Iowa City, IA
Warrior N33431
Ron Natalie <r...@sensor.com> wrote in message
Yoram Solomon
Check out http://www.lycoming.textron.com/
Yoram.
Yoram Solomon <sol...@worldnet.att.net> wrote in message
news:85tta9$39n$1...@bgtnsc01.worldnet.att.net...
> Just check the POH. Different models have different engines that should
be
> checked at different RPM. Your POH (updated if engine was replaced!)
should
> tell you, and nobody else!
>
> Yoram.
>
>
>