Cirrus SR20 2010, Maintenance Manual

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C I R R U S
A I R P L A N E M A I N T E N A N C E M A N U A L M O D E L S R 2 0
51-20
Page 31
All
EFFECTIVITY:
(9) Laminating - Transfer Method (See Figure 51-209)
This method is used when the repair is in a difficult position. The Transfer Method is similar to
Laminating in Place, except the repair plies are stacked on a sheet of release film and then wet-
ted-out with resin. The repair plies assembly is then centered and applied to repair surface.
To determine number of repair plies to prepare, reference the ply lay-up tables in the Airframe
Zone Diagrams.
(Refer to 51-00) If no repair ply quantity is shown, always prepare and install
twice as many repair plies as the original lay-up in order to assure that the original strength is
achieved.
Center each ply over the damage. Each ply must have half of the total overlap on all sides of the
damaged area or over the previous repair ply. The first, smallest ply must be 0.5 - 1.0 inch (1.3 -
2.5 cm) larger than the damaged area. Each following ply must be 0.5 - 1.0 inch (1.3 - 2.5 cm)
larger than the previous repair ply.
Plies must be installed in the same orientation as the original plies. Every other repair ply must
be installed in opposing orientation to prevent the repair from warping.
When using peel ply, position the peel ply on the outermost ply only. Ensure peel plies are
removed prior to secondary bonding. Do not bond plies on top of peel ply.
(a) Acquire necessary tools, equipment, and supplies.
(b) If applicable, prepare backing plate. (Refer to 51-20)
(c) Prepare repair area. (Refer to 51-20)
(d) Prepare repair plies. (Refer to 51-20)
(e) If applicable, prepare EMM surfaces. (Refer to 51-20)
(f) Cut two sheets of release film approximately 6 inches (15 cm) larger than the total repair
area.
(g) Place one sheet of release film on a flat, contaminate-free work surface.
(h) To ensure proper ply orientation, draw 0° reference line on work surface to replicate actual
repair area.
(i) If repairing an outside, finished surface apply a sheet of peel ply with same shape and size
as outermost repair ply onto the release film.
(j) If necessary, mix MGS L418-based filler paste and apply to fill any dents, gouges, or other
voids in prepared repair surface.
(Refer to 51-20)
(k) Mix structural resin. (Refer to 51-30)
(l) If applicable, remove clecos or sheet metal screws used to temporarily attach backing
plate to laminate.
(m) Lay-up glass fabric as follows:
Description P/N or Spec. Supplier Purpose
Scissors - Any Source Cutting.
Paint Brush - Any Source Resin application.
Release Film (Refer to 51-30) (Refer to 51-30) Repair lay-up.
Squeegee - Any Source Repair lay-up.
Peel Ply (Refer to 51-30) (Refer to 51-30) Repair lay-up.
Glass Repair Fabric (Refer to 51-30) (Refer to 51-30) Repair lay-up.
Structural Resin Repair System (Refer to 51-30) (Refer to 51-30) Repair lay-up.
15 Jun 2010