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: -
15-6
Minimum distances of rivets from the edge of sheet metals or inserted bands are shown
in Tab. 15-2:
Rivet diameter Distance of rivet axis from the edge of the sheet metal (angle
minimum recommended
2.4 mm (3/32 in) 5 mm (0.2 in) 7 mm (0.27 in)
3.2 mm (1/8 in) 6 mm (0.24 in) 7 mm (0.27 in)
4.0 mm (5/32 in) 7 mm (0.27 in) 8 mm (0.31 in)
Tab. 15-2
Minimum distance of rivets from the edge
15.4.4 Angle repair
Repair method consists in stiffening the damaged angle by means of the new one. When
repairing observe the following instructions:
Determine the section area of the damaged angle S1
Choose S2 = 1.1 S1as section area of the stiffening angle.
Thickness t2 = (1 to 1. 3) t1
Drill of rivets in the area of repair
Choose the same rivet diameter as in the damaged place.
Use at least two rivets on each side from the crack
At riveting follow 15.3
Fig. 15-2
Scheme of angle repair
15.4.5 Skin repair
15.4.5.1 Stopping cracks and blinding small holes
Propagation of small cracks can be stopped by drilling a hole with the drill bit of dia 3.2 mm
(1/8 in) at the utmost end of the crack. If propagation continues, repeat the drilling. Support
the place of drilling with a wooden block at drilling thin skin and use the sharp drill bit so that
it will not drift and will not cause another damage to the skin. Check in the operation whether
the crack was successfully stopped.
At drilling the crack of the skin in the area of the flange, supporting stiffener etc., protect these
parts before drilling by supporting the drilled place by means of the thin steel band. If the
crack still propagates after repeated drilling, cut out the affected area and repair the skin by
means of the patch - see next paragraph.