On Sep 12, 2004, at 10:09 PM, Kevin Gassert wrote:
Many years ago on my first Ercoupe I change the control quadrant and cables to eliminate AD 53-26-02. As I remember the quadrant had the part number cast into it. I looked at my current Ercoupe today to see if it was the new or old style but I can’t find a part number on it. What other way can I tell if it is new or old. I guess I could tell by the cable lengths. Does anyone know the lengths old the new and old style cables?
Thanks,
Kevin
Hi Kevin,
I believe you meant to refer to AD 54-26-02.
The original quadrant was part number 415-52122 or 415-52130, later F-52130. The "new style" quadrant part number is 415-52137, $159.06(?) from Univair.
The original cables were part numbers 415-52148, later 415-52132 and 415-52172 and either 7-13/16 or 7-15/16 (measured from inside cable sleeve to inside cable sleeve). On Forney cables, F-52132 and F-52172, above measurement was 8.187 (measured the same way) "to prevent binding" per F.A. 211 of 2-24-58 effective Serial Nos. 5634 and up.
The "change" necessary to dispense with the 100-hour inspections is installation of "...a control quadrant...considered acceptable by the Administrator." Such acceptability is further described as "Modifications approved...believed to eliminate the fraying difficulties are described in..." (four drawings listed, the latest of which is February 21, 1955.
If anyone has a copy of any of the listed drawings, it is highly probable that existing quadrants may be modified with greater radius where these cables wind tightest around and/or by fitting the longer Forney cables (which this AD clearly precedes).
If not, perhaps Skyport would be interested in seeking such "modification per our drawing for a nominal charge" approval after reverse-engineering one of the 52137 quadrants or the Forney quadrent F-52130, 11/27/57 or rev. 4/16/58. This was apparently not too difficult, judging from the various earlier approved "solutions".
Regards,
William R. Bayne
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(Copyright 2002)
