R
R
R
B. Screened convoluted conduits
(Ref. Fig. 001)
(1)
Conduit layout
(2)
Table for damage assessment
(3)
When the repair is selected (refer to para 3): repair procedure for the general description and conditions of application.
C. Overbraided conduits
(Ref. Fig. 002)
(1)
Conduit layout
(2)
Table for damage assessment
(3)
When the repair is selected (refer to para 3): repair procedure for the general description and conditions of application
________________3. Repair Procedure
A. General requirements
(Ref. Fig. 003, 004)
This paragraph gives the general description and conditions of
application for each repair type.
____
NOTE : Protected harnesses used for flight control system (identified by red labels) or in movement (hinge or equivalent) should not be repaired, they have to be changed (the repair is grade 4). However, those protected by braided conduits or overbraided could be repaired and the repair is grade 3.
____
NOTE : For all harnesses located in the landing gear and fire areas and protected by convoluted or flexible conduits, the repair is grade
2. However, for those protected by braided conduits and overbraided, the repair is grade 3.
____
NOTE : Only one repair is admissible per two meters length for total length of the protected harness. Beyond this limit, whatever the type of damage, replace the bundle protection and/or the harness.
20-53-32 Page 2
R Repair of Metallic Conduits - Damage Table for Screened Convoluted Conduits R Figure 001
20-53-32 Page 3
R Repair of Metallic Conduits - Damage Table for Overbraided Conduits R ABS1353-003 and ABS5315 R Figure 002
20-53-32 Page 4
R Repair of Metallic Conduits - Repair Procedure for Screened/Overbraided Conduit R Figure 003
20-53-32 Page 5
R Repair of Metallic Conduits - Repair Procedure for Screened/Overbraided Conduit R Figure 004
20-53-32 Page 620-53-32 Page 7
R
R B. Procedure
R (1) Repair type 2-A - Addition of heat shrinkable sleeve NSA937210MB
R (Ref. Fig. 005)
R - Clean the area using Material No 11-026A cleaning product and a
R little brush.
R - Disassemble the connectors.
R - Cut a NSA937210MB heat shrinkable sleeve to length of the damage
R plus 20 mm (0.7874 in.) for each side.
R - Slide the sleeve on the damaged harness area.
R - Shrink the sleeve with the applicable tool.
R (2) Repair type 2-B - Wrapping with self-welding tape ABS5334
R (Ref. Fig. 003, 005, 006)
R - Clean the area using Material No 11-026A cleaning product and a
R little brush.
R - Cut the damaged halar sheath or the teflon area (if installed).
R - Fold back the broken screen strands (if damaged).
R - Wrap for protection with self-welding tape ABS5334 (overlap 50% and
R 30 mm (1.1811 in.) each side of the defect).
R - The first wrap and the last wrap must have a 100% overlap.
R - Hold the ends using NSA8420 cable wrap fixed with CAF4 (Material No
R 08-004).
R (3) Repair type 2-C - Loop resistance test
R (Ref. Fig. 003)
R - Clean the braid using Material No 11-026A cleaning product and a
R little brush.
R - Disassemble the connector.
R - Clean and reassemble the connector.
R - Check the resistance of the conduit with the applicable tool:
R High contact resistance.
R Loop resistance test < 5 mohms.
R If resistance between connector and braid is > 5 mohms replace the
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