Zlin Aviation
Section 2
Maintenance Manual Line Maintenance, Repairs and Alterations
Issued: 01/02/2006
QAP-AMM-Rev02
Date of latest Revision: 23/01/2013
Page Number: 2-12
PATCH REPAIR LESS THAN 8 INCHES
(a) Trim any ragged edges.
(b) Lay an un-shrunk piece of material over the hole and trace the outline of the patch with a #2 pencil. Make
sure to allow for enough overlap as explained earlier. Note that square or rectangular patches are preferable.
Cut out the patch with pinking shears.
(c) Mask off the area outside the patch leaving an extra half-inch or so of working room around the contour
of the patch.
(d) Peal the polyurethane paint off and clean all the coatings inside the masked area with MEK down to the
bare fabric.
(e) Glue the patch to the old fabric with Poly-Tak and allow it to dry.
(f) With an iron set to 225ºF, smooth the glued areas.
(g) Heat-shrink the area of the patch over the hole with a 350ºF iron. This acts as a shrinking panel to re-
tighten the fabric in the area of the repair. Use a piece of cardboard as a shield to keep the iron off the glued
areas, if needed.
(h) Poly-Brush requires two applications. Each application consists of 2 coats.
The first coat should be brushed on to penetrate the fabric.
After the first coat has flashed off, apply the second coat by brushing or spraying
on then allow it to dry.
If finishing tapes are needed, attach them with Poly-Brush.
Smooth the finish tapes with a hot iron.
Make a second application of Poly-Brush (2 coats) allowing it to flash off in between coats. The
Poly-Brush may all be brushed on if it is a small patch or sprayed if it is larger or in a high visibility
area.
(i) Make 2 applications of Poly-Spray.
(j) For the first application;
Blow and tack off the covering to be sure it is as dust free as possible.
Spray or brush the first coat of Poly-Spray. Allow to dry for approximately 15 minutes
Spray or brush the second coat of Poly-Spray and make sure it is dry before sanding.
(k) For the second application;
Smooth any edges, which may be sticking up, using a small hot iron.
Smooth tape and doubler edges using dry 320 grit sandpaper to remove surface dust bumps.
Blow and tack off the covering to be sure it is as dust free as possible.
Spray or brush the third coat of Poly-Spray and let dry for approximately 15 minutes.
Spray or brush the fourth coat of Poly-Spray and let dry completely before sanding.
(l) Paint to match original paint
