As I recall the service note about removing the aileron weights, it noted that
the free play in the ailerons should be less than 5/16inch. If removing the
weights so that no flutter would occur at high speed as was recently reported
in this group. You should check this all times anyway but particularily when
removing the aileron assemblys. See service memorandum # 57.. For 18 or 20
bucks all coupe owners should have a copy for reference. Call John at Skysport
or Univair . This answers a lot of questions that are raised here and is not
highly technical. By the way, those weights were almost 4 pounds.
Tom Couper 3989H
fnelson913 <[EMAIL PROTECTED]> wrote:
Thanks, Syd. That satisfies my desire for completeness.
Thanks.
Frank
--- In [email protected], Syd Cohen <[EMAIL PROTECTED]> wrote:
>
> Good hypothesis, Frank. The aileron balance weights were removed
from
> most Ercoupes, making AD 47-20-06 not applicable to them.
>
> Syd
>
>
>
> fnelson913 wrote:
>
> > While going through my AD's from compliance, I have been back-
> > checking to see why each AD marked N/A was so marked. I came upon
AD
> > 47-20-06 ERCO which on the surface looks like a needed
reinforcement
> > to the lower aileron skin. After reviewing Ercoupe Service
Bulletin
> > No. 20, I see that this reinforcement is at the place where the
> > Aileron Balance Assembly (part no. 415-16009) is attached.
> >
> > Looking at the drawing in SB #20, it looks like this little device
> > hangs off the bottom of the aileron with a weight attached to an
arm.
> > I suspect that as this arm bounces up and down it flexes the
aileron
> > skin to where it is attached, hence the requirement for
> > reinforcement.
> >
> > So here is my dilemma. I can't remember seeing any such device
> > attached to the bottom of my wings. I checked the parts catalog,
and
> > sure enough there it is. Then I went and checked my Coupe: no such
> > device. I even checked another Coupe here at the airport (honest
> > Linda, I didn't touch the Sky Sprite... I just looked), and it
didn't
> > have aileron balance assembly either.
> >
> > Here is my hypothesis: there was a time that the aileron balance
> > assembly seemed like a good thing to have. That time has passed
and
> > therefore the needed reinforcement has passed.
> >
> > Who can tell me more about this?
> >
> > Thank you.
> >
> > Frank Nelson
> > N51DV - 415C
> > TOA/California
> >
> >
>
