No you are not wrong. The orifices for the main and nose gear piston should be revised as follows: main gear s/n 113-812 .067" diameter nose gear s/n 113-1622 .281" diameter
this from note 3 of aircraft spec a-718 stating requirements for eligibility to go to 415-D under terms of aircraft spec A787. As you can see by the s/n's listed, it does not effect many coupes. Dan ---------- > From: Sydney B. Cohen <[EMAIL PROTECTED]> > To: Bob Urban <[EMAIL PROTECTED]> > Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: Re: Two-Pronged Advice > Date: Saturday, December 12, 1998 5:49 AM > > Bob Urban wrote: Is my memory failing me or don't you have to > change\drill orifice size in > the main gear too when going from "C" to "D" model. > > > > > I don't think so. I find no referenc to it in the Information Letter > quoted below: > > According to Ercoupe Information Letter #1: Subject: Conversion of > Ercoupes to Later Models, dated Jan 1, 1956: > > "The Model 415-D Ercoupe was developed under F.A.A. regulation Part No. > 03, and permitted the gross weight of 1400 pounds on the Ercoupe under > these regulations. In order to obtain satisfactory stability conditions > with power on, it was necessary to limit the up elevator travel to 9 > degrees. In the opinion of the factory, this limitation seriously > affected landing qualities of the Ercoupe. For this reason, the 415-CD > was produed instread. The 415-CD had all the modifications other than > the elevator travel necessary for the 415-D, but was licensed under the > 03 catagory, which still restriceted it to 1260 pounds. > > "In order to convert a Model 415-CD to a Model D, it is necessary to > limit the up elevator to 9 degrees, add placards to the instrument panel > prohibiting smoking and prohibiting aerobatics, and require that the > airplane be flown in accordance with limitations in the Approved Flight > Manual. It is necessary to supply the suitable flight manual as well. > > "A Model 415-CD can be converted to a Model E and achieve the 1400 > pounds gross weight, and at the same time, improve the landing qualities > instead of destroying them by the use of the cut-out or "split" > elevator. With this elevator satisfactory stability is retained and the > landing characteristics improved with the up travel of 20 degrees with > the reduced area elevator. The Model E has an 85-h.p. enging and it, > therefore, is necessary to convert the engine to this power, changing or > modifying the propeller as necessary for the higher power. The other > modifiactions given above, and including the Model E Flight Manual, are > required for this conversion. > > "The changes necessary to convert the Model 415-C to Model 415-D or a > Model E depend upon the serial number of the airplane, however, in all > cases it is necessary to install the stainless steel skin over the > fuselage gas tank and to make the other changes indicated for the Model > 415-CD. The instrument panel should be changed to the late type and it > is desirable to modernize the airplane in other respects but these items > are not required by the F.A.A. for the increased gross weight." > > Syd Cohen > NC94196
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