2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific clean stainless steel wire brush No specific grade 400 emery cloth No specific sandpaper-grade 200 No specific 2-cut milling cutter
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 11-026  GB DEF-STAN 68-148/1 SOLVENT GENERAL PURPOSE (Ref. 20-31-00)
 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-23-11-991-072  Fig. 273
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 3. Job Set-up
__________
 Subtask 20-23-11-860-058
 A. Procedure Requirements
 (1)
 You must not do this repair on the aircraft. You must remove the pipe from the aircraft.

 (2)
 Life limitation of the weld repair

 (a) A temporary repair with this manual T.I.G. welding method is limited to a maximum of 20 Flight Cycles.
 NOTE : You must replace the repaired tube by a new one before a
____
 maximum of 20 Flight Cycles.

 (3)
 Certification of the operators

 (a) The operators must have an approved licence/certificate (refer to the local Airworthiness Authorities) for:
 -manual T.I.G. welding process,
 -dye penetrant test.

 (4)
 Repair criteria

 (a)
 You can do this repair procedure only if:

 -
the damage is a through crack with a maximum length of 10 mm (0.3937 in.).

 -
the distance between two cracks is not less than 15 mm (0.5905 in.).

 -
the weld does not change the geometry of the pipe.

 -there is not already a repair in the repair area.
 -two longitudinal cracks are not on the same generatrix (line).
 -the tube does not have more than 5% ovalization for stainless steel pipes and 3% for titanium pipes.

 (b)
 Only one weld is permitted on the circumference.

 (5)
 Adjustment of the welding parameters

 (a) Before the repair, you must do a welding test on a specimen of tube of the same material and with the same diameter/thickness to get the applicable welding parameters (electrode diameter, amperage, power, etc).
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 NOTE : You must do the steps described in this procedure during
____
 the welding test.

 NOTE : You must identify the test specimens and keep them until
____
 the replacement of the repaired pipe.

 (6) Weldable materials
 (a) This repair method is applicable only for the tube materials that
 follow: ---------------------------------------------------------------------| Titanium alloy TA3V2.5 (ABS5004) material | ---------------------------------------------------------------------| Tube | Tube DIA. | Thickness |Operating Pressure | | Size | in. | mm | in. | mm | psi | bar | |------|----------|---------|---------|---------|---------|---------| | -04 | 1/4 | 6.35 | 0.016 | 0.406 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -06 | 3/8 | 9.525 | 0.019 | 0.483 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -08 | 1/2 | 12.70 | 0.026 | 0.66 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -10 | 5/8 | 15.875 | 0.032 | 0.813 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -12 | 3/4 | 19.050 | 0.039 | 0.991 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -16 | 1 | 25.4 | 0.051 | 1.295 | 3000 | 206 | ---------------------------------------------------------------------
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 ---------------------------------------------------------------------| Stainless steel 21.6.9 (ASNA3288) material | ---------------------------------------------------------------------| Tube | Tube DIA. | Thickness |Operating Pressure | | Size | in. | mm | in. | mm | psi | bar | |------|----------|---------|---------|---------|---------|---------| | -04 | 1/4 | 6.35 | 0.016 | 0.406 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -06 | 3/8 | 9.525 | 0.019 | 0.508 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -08 | 1/2 | 12.70 | 0.026 | 0.66 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -10 | 5/8 | 15.875 | 0.032 | 0.838 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -12 | 3/4 | 19.050 | 0.051 | 0.991 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -16 | 1 | 25.4 | 0.052 | 1.321 | 3000 | 206 | |------|----------|---------|---------|---------|---------|---------| | -24 | 1-1/2 | 38.1 | 0.024 | 0.609 | 80 | 5.5 | ---------------------------------------------------------------------
　
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