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: -
15-5
After applying bonding sealant connect both parts together, fix them by clecos and rivet
them.
NOTE
After proper riveting the continual bur of adhesive is created on the edge of connected
surfaces. If this bur is big, it is possible to wipe it off with the plastic spatula and finally with
cloth dipped in degreasing agent.
After riveting, seal rivet heads, there, where are used pop rivets - see 15.6.2.2.
15.4 Skin repairs
15.4.1 Removing damaged skins
In case that it is necessary to remove bigger part of the skin, ensure reliable support of the
structure. Appropriately support the damaged part of the fuselage monocoque or the wing by
supports located in the area of fuselage frames or wing ribs. The shape of supports must
correspond with the shape of supported place and must be supplemented by cushion (or with
other suitable material), so that airplane skin surface cannot be damaged. Remove rivets
according to 15.2.
15.4.2 Division of damaging into groups
To determine way of repair, find out by inspection the scope of structural damage, also in
case of possible unriveting the skin.
Damage can be divided into the following groups:
Small damage, which do not have to be repaired, such as local small impacts, scratches
in the skin not exceeding thickness of the zinc chromated layer, appearance defects of
paint coat etc.
Damage, which can be eliminated by airplane operator. Methods of elimination are
describer further in the text.
Damage with disturbance of basic structural elements of the aircraft. (Deformation of
wing and stabilizer spar, deformation of wing ribs, fuselage bulkheads etc.). These
repairs can be made only by BRM AERO as producer or by authorized repair shop - for
more detailed information contact BRM AERO.
15.4.3 Principles for repair method determination
When repairing the damaged skin or airplane structure keep the following principles:
Drill of the loose or damaged rivets and replace them with new rivets (see 15.2).
Strength in any section of the repaired place must be as a minimum equal to the strength
of the original part.
Use the same material for repairs as the material of a defective area (for survey of used
materials see 15.4.3).
Carry out repair of skin damaging by means of patches having the same thickness as
the original skin or higher.
Repair the angle defects with inserted angles with the section by 10 to 20% higher than
the section of the damaged angle (see 15.4.4).
Loading from one side of the repaired area must carried through the repair element
directly to the other side.
Length of overlapping in the area of repair must be satisfactorily big so that loading can
be equally distributed to non-defective part of the structure.
If possible, use existinting holes for the rivets. If these rivets are not able to transfer
loading, drill other holes. Rivets around of the repaired area are a criterion for rivet size
selection.