BRISTELL S-LSA, Руководство по техническому обслуживанию и инспекции

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15.CHAPTER
– AEROPLANE REPAIRS
Document: SLSA-MIP-5-4-0-US Date of Issue: 05/2016 Revision: -
15-16
Type
of
color
Manufacturer,
name
Type
other
items
Surface
mass
Recommended
thickness
Drying (between
spraying / total)
18°C (65°F)
single
coat BASF
Glasurit
R-68 / shade
(base)
acrylic
–
polyurethane
BASF
Glasurit
922-36
(standard
hardener)
Glasurit
352-91
(standard
thinner)
5.24-8.38
[lb/inch/ft
2
]
1-1.6
[kg/mm/m
2
]
(by shade)
0.00078-
0.00157”
0.02-0.04mm
15 min / 16 hrs.
Double
coat
base color
coat: BASF
Glasurit
R-55 / shade
(base)
acrylic
–
polyurethane
BASF
Glasurit
352-216
(thinner,
long)
6.29-7.33
[lb/inch/ft
2
]
1.2-1.4
[kg/mm/m
2
]
(by shade)
0.00059-
0.00078”
0.015-0.02mm
10 min / 20 min
Top coat,
bright:
BASF
Glasurit
923-155
(base)
acrylic
–
polyurethane
BASF
Glasurit
929-93
(standard
hardener)
Glasurit
352-91
(standard
thinner)
4.82
[lb/inch/ft
2
]
0.9
[kg/mm/m
2
]
0.00118-0.00157
”
0.03-0.04mm
5 min / 5 hrs.
Tab. 15-6
Recommended paints
15.6.3 Small damage
15.6.3.1 General
Small damage is a deterioration of corrosion resistance. At repair the situation is made more
difficult by the fact that the substrate for repair coats is not a compact surface of basic material
but mostly al coats of surface protection (after sanding), of which not all are suitable for (in
ageing stage) for good adhesion of paint coats. Therefore we recommend to carry out such
repairs by a verified system.
Before repairing it is necessary to differentiate the type of the existing topcoat, single coat
and two-coat (with the top coat). For repair it is necessary to follow the used type of color.
It is suitable to choose the delimited area (e.g. connection of sheets, wing edge) for the scope
of the place, which is being repaired transition, is then better blended. In the case that it is
not possible to choose the area in this way, it is necessary to take into consideration the
higher difficulty of the procedure as for the uniformity of shade and elaboration of coat
transition.
15.6.3.2 Sanding
For good adhesion of the repair coats it is necessary to carry out sanding of the old paint
coat at least up to such depth as the depth of damage. Ground area must be larger from 51
to 102 mm (2 to 4 in) than damaged area. With two-coat type of the topcoat it is necessary
to add at least 51 mm (2 in) for the run-out of the top coat. Sanding can be started with