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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