Cecil Myers wrote:
> Help! anyone;
>
> I have found in ercoupe aileron parts list that a balancing unit is
> listed. I have owned Ercoupe N87435 for ten years and it has'nt had
> units on it all this time, it's been annualed each year and no mech. has
> mentioned them being gone. What's the deal are they important or not?
> If they are important what is the procedure for ballancing them?
>
> Any suggestions?
>
Cecil,
Ercoupe Service Memorandum No. 57, dated October 11, 1949, titled
"Aileron Balance Weight Removal," says:
"In the past, some difficulty has been experienced with the
attachments
of the aileron balance weights. These balance weights, in addition to
being a maintenance problem, might present a flight hazard if permitted to
become loose and remain that way.
"As a result of recent test and analysis, it has been determined that
the aileron weights on the Ercoupes may be removed and the aileron will
still maintain freedom from flutter throughout the operational range of
the
airplane, provided the aileron free play does not exceed 5/16".
"In order to measure aileron free play, one aileron should be blocked
in the neutral position and the free play measured at the trailing edge of
the other aileron. In checking the motion, care should be taken not to
exert sufficient force to deflect some of the members, thereby getting a
false reading. (See Service Memorandum No. 56)
"It is recommended the aileron system be checked for free play after
every 100 hours of operation and if measurement exceeds 5/16", all joints
and bearings should be checked and those which are loose should be
tightened or replaced.
"Removal of aileron balance weights is not mandatory, but is
recommended for all Ercoupes Model 415C, 415CD, 415D, E, and G. The
weight
of the parts removed totals 3.5 pounds and their CG is 55.5" behind the
datum line."
Cecil, you can get a book containing all of the Ercoupe Memoranda and
Service Bulletins from Univair or Skyport. I highly recommend every
Ercoupe own one.
Syd Cohen
Wausau, WI
NC94196
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