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 -3 mm (0.1181 in.) for a tube thickness of less than 0.48 mm (0.0188 in.)
 -between 3 mm (0.1181 in.) and 5 mm (0.1968 in.) for a tube thickness of between 0.48 mm (0.0188 in.) and 1.3 mm (0.0511 in.).
 2 Make sure that the maximum height of the weld bead is not more
_ than 0.1 mm (0.0039 in.). If the maximum weld bead height is more than 0.1 mm (0.0039 in.):
 -grind and finish with sandpaper-grade 200. Make sure that the remaining thickness is more than the thickness measured on the base metal.
 3 Make sure that the crater at the beginning and the end of the
_ weld bead is free of subsiding, cracking and staining.
 NOTE : Light staining is permitted. On a small diameter tube,
____ staining on the opposite side of the weld must remain within the limits of the thermally affected zone.
 (b) Pressure test
 1 Do a pressure test for 3 minutes minimum at ambient
_ temperature with hydraulic fluid at: - 360 bar (5221.3572 psi) for tube in stainless steel 21-9-6 -
high pressure pipes - 120 bar (1740.4524 psi) for tube in stainless steel 21-9-6 -low pressure pipes - 15 bar (217.5565 psi) for tube in stainless steel 21-9-6 -suction pipes

 NOTE : No leak is permitted.
____
 (c) Dye penetrant test
 1_ Do a dye penetrant test in the welded area.
 2_ Make sure that there is no sign of a defect.
 NOTE : If you are not sure of the quality of the weld, rub____
 with sandpaper-grade 200 and do the dye penetrant test
 again.
 3_ If the dye penetrant test shows that there is a defect,
 discard the repaired pipe and install a new one on the
 aircraft.

 

 LINE TYING - MAINTENANCE PRACTICES
__________________________________
 TASK 20-23-14-910-001
 Protection Against vibration and Chafing of Hydraulic Pipes

 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 04-012 USA VV-P-236 PURE MINERALVASELINE OR PETRO- LATUM (Ref. 20-31-00) R Material No. 08-004 USA MIL-A-25457 ADHESIVE SEALANT (Ref. 20-31-00)
 Material No. 19-002  USA MIL-T-713
 SYNTHETIC FIBRE CORD (NYLON) 2.5MM DIA.
 (Ref. 20-31-00)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-23-14-991-001 Fig. 201
 20-23-14-991-002 Fig. 202
 20-23-14-991-003 Fig. 203
 20-23-14-991-004 Fig. 204
 20-23-14-991-005 Fig. 205

 3. Job Set-up
__________
 Subtask 20-23-14-910-050
 A. Not Applicable

 4. Procedure
_________
 Subtask 20-23-14-910-051

 A. Minimum Distances Necessary to Prevent Chafing of Hydraulic Pipes. (Ref. Fig. 201/TASK 20-23-14-991-001)
 (1) Pipes and hoses must not touch other pipes and hoses or adjacent components.
R NOTE : It is permitted for hydraulic hoses that have blue textile
____ R antiabrasion sheathes to touch each other.
 (2) The standard minimum distances you must have on hydraulic pipes/hoses routings are specified in this document.
 NOTE : If a maintenance procedure specifies a different minimum
____ distance, you must obey this distance.
 (3) To measure the minimum distance between a pipe/hose and a part that can move:
 -measure the distance in the condition where the movement decreases the distance to its smallest value.
 Subtask 20-23-14-910-052
 B. Protection from Vibration and Chafing. NOTE : When the clearance is less than the minimum distance, you can use
____
 lacing tape, bumpers, spacers and clamps:

 -to get the minimum distance
 -to prevent chafing. NOTE : If you find that a spacer is missing, we recommend that you
____ replace it with a pair of P-clamps NSA5516 or with lacing tape (P-clamps give the best protection from vibration).
 NOTE : You must not attach hydraulic pipes (with lacing tape, bumpers,
____ spacers and clamps) to pipes of other systems (air, fuel, water, etc.) or electrical harnesses.
 NOTE : You must identify the location where you attach the hydraulic
____ pipes (with lacing tape, bumpers, spacers and clamps) with:
 -identification tape ABS0653-05 or NSA0144-4 or
 -white/red paint that is resistant to hydraulic fluid.
　
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