Hi Bill, Jim
Univair's Service Kit SK-35 and Skyport Modification Kit SMK 115
retrofit Ercoupes from Serial No. 813 up
and early Forney F-1s with Belleville Springs (replacing the original
solid rubber "donut" taxiing shock absorbers).
I believe this is the text from the instructions you want (it's just a
typed sheet...no logo or letterhead):
FAA-PMA
M. D. Hubbard Spring Co.
217 Central Ave.
Pontiac, Michigan
(SPRING ASSEMBLY P/N PCHF-121)
(as furnished by Forney as FMK-9)
Eligible for installation on Aircraft Certificated under under Type
Certificates 718 (Models 415C & CD) and 787
(Models 415D, E, G, F1 and F1A). (Serial 813 and higher)
INSTALLATION INSTRUCTIONS
BELLEVILLE SPRING CLUSTERS
After removing the Shock Strut Cylinder from the ship, remove with a
pair of crew drivers, the retaining ring.
After removing the pressure cap, remove the Rubber Buns and Aluminum
cups. After lightly coating the
cylinder on the outside with grease, install 7 Belleville Clusters in
place of the Rubbers and Cups. Replace
the pressure cap and retaining ring after shimming the bottom platform
to the correct height. The top pressure
cap should be snug against the retaining ring, but should give only
light, or no pressure on it. With the ring
replaced, the shock is reasy to reiinstall in the ship, using the new
"O" ring (part 6227-17) on the piston and
the proper oil iin the cylinder.
Oleos in Ercoupes (et al) Serial No. 813 up were manufactured for
sealing with an AN6227-17 O-ring and were
filled with red hydraulic oil.
Since the oleos tend to wear fore-aft only, the cylinder elongates over
time to become sufficiently oval that an O-ring
can no longer seal properly. Skyport has long offered an STC-FAA-PMA
Kit, SMK 61 to install the earlier cup seal
as an alternative to the original O-ring. With this kit installed, the
oleo must be filled with automobile brake fluid.
Whichever is fitted, it is recommended that the seal be replaced
whenever the oleo is disassembled.
Regards,
William R. Bayne
.____|-(o)-|____.
(Copyright 2009)
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On Aug 9, 2009, at 20:42, Jim Stasny wrote:
I am also interested in this information. Please pass it on when you
receive the info.
Jim Stasny
'46 415-C N99215
Hi,
Does anyone know where I can obtain installation instruction for the
Belville springs?
Bill Coons
