On 02/14/06 10:13, John Kunkel wrote:
"Mark Hansen" wrote in message
...
I have a maintenance question.

I read somewhere that the mixture control should not bottom-out against
the firewall when full rich, as the pilot would not be able to tell if
the full-rich position was achieved, or if the knob just hit the firewall
stop.

However, I'm wondering if this is just a rule of thumb, or if there is
an actual FAR which dictates it, and which FAR that is?

While it's probably not a regulation, most service manuals specify that both
throttle and mixture knobs have a certain amount of "springback" instead of
the knob contacting the panel; the Piper Cherokee manual, for instance,
specifies 1/16" to 1/8" springback.



Is it possible to determine whether or not this is specified in the
service manual for the particular Cessna aircraft I'm flying? It's
a 172N model. Are the service manuals available online?

I guess what I'm looking for is something that I can show to the maintenance
people at the club, as they said the mixture control is working correctly
when I complained that it should not hit the firewall.

Thanks,

--
Mark Hansen, PP-ASEL, Instrument Airplane
Cal Aggie Flying Farmers
Sacramento, CA