Landing Gear - WACO YMF F5 Series Maintenance Manual

To protect the fabric from the deteriorating effects of sunlight, three spray coats of silver dope are applied.
The silver dope is prepared by adding 2 ½ to 3 ounces of silver paste to each gallon of unthinned W-8350
dope. The silver dope is thinned as necessary for spraying. A spray coat of white butyrate dope is
applied as a final step in the dope system, which prepares it for the finish paint of the customers' choice.
WACO Aircraft Serial Numbers F5001 through F5C096 have been finished with Dupont Imron
Polyurethane Enamel. Serial numbers F5C097 and up have been finished with PPG Delta Polyurethane
Enamel.
The finish is very durable and requires only washing to retain its original shine. When washing, flush off
the abrasive dust and dirt using flowing water and a sponge or soft cloth. Then wash with mild detergent
to remove grease and surface deposits. Rinse with clean water to remove detergent residue and wipe
dry with a soft towel or chamois.
If the dope or Ceconite surface is damaged it should be repaired immediately. Small cracks in the dope
can be sealed by carefully feeding thin cyanoacrylate instant glue into the crack until the crack is filled.
This reattaches the dope to the fabric and seals the crack. The crack can then be sanded and repainted
in the usual manner. Care must be used to mask the adjoining areas as any glue drips or runs will
instantly mark the surface.
When a repair requires doping, all of the enamel must be sanded off of the area where dope will be
applied because the dope will not bond to the enamel.
Small holes or tears may be repaired with a patch cut from a three-inch cotton pinked tape or cotton cloth.
Patches should be cut out with pinking shears, large enough to extend 12 ½ inches beyond the edges of
the repair. The patch should be cemented in place with Ceconite Super Seam Cement and then finished
with the original dope and paint schedule.
Larger patches and replacement panels must be Ceconite 102 fabric cemented in place using Ceconite
Super Seam Cement with 1 ½ inch edge lap. After the cement has dried, shrink the patch to the desired
tautness and then apply two coats of G-6302 Ran-O-Proof Primer and one coat of W-8350 Butyrate
Dope. The edges of the patch should be covered with two inch pinked tape and then the patch should be
finished with the original dope and paint schedule.
When panels between ribs must be replaced, cut the fabric one inch inside the rib nearest the damaged
portion and carry the patch over and beyond the rib by three inches. The replacement panel must extend
over the leading edge and back to the front spar and the other lapped over the trailing edge. When the
replacement panel extends over ribs, apply reinforcing tape and rib stitch it, without disturbing the old rib
stitching. All large patches and replacement panels shall be taped over all edges and refinished per the
original dope and finish schedule.
6.2

LANDING GEAR

(A) Landing Gear Oleo Shock Struts
These shock struts are so constructed that initial landing shock is absorbed by the oleo action before the
piston reaches the shock spring at the top of the strut. Taxi shocks are absorbed by this coil spring in
combination with the normal oleo action of the strut.
You will note there is practically no rebound after the initial impact with the ground in landing, as this initial
impact is taken entirely by the oleo action of the strut.
Very little maintenance is required. It is suggested, however, that the oil level be checked EVERY 100
HOURS, if the ship is in regular service.
If excessive oil leakage occurs, the struts should be dismantled completely and each part cleaned with
solvent. Each part should be inspected and all worn parts, if any, should be replaced. The struts when
reassembled should be filled with new oil.
Instructions on Filling Shock Struts
(1) Remove lock wire locking 1/8" pipe plug at upper end of shock strut and remove plug.
REVISION: H
RELEASED: 07/21/2017
WACO Classic Aircraft Corporation
YMF WACO F5 SERIES MAINTENANCE MANUAL
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PART NO. YMFAMM-1