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Figure 7-3.  Tubing Repair (High Pressure)
Figure 7-6.  Damaged Tube Section Straight Tube

TM-1-1520-240-BD Army CH-47D Heilcopter (NSN 1520-01-088-3869) (EIC:RCD) Manual
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TM 1-1520-240-BD Figure 7-4.  Repair (Flareless) Seat 7-15.  BLEED  AIR  PIPELINES.    Effective  repair  of  hot bleed air ducts is considered temporary.  Limited repair may be made as outlined below: a. Repair Procedures.  Repair should be limited to areas not exceeding two inches in diameter (Figure 7-5). b. Insulation.    Remove  enough  insulation  blanket or    permanent    insulation    to    gain    access    to    metal damaged  area.    Clean  duct  surface,  and  smooth  out damaged area. c. Installation.  Install flexible stainless steel sheet (0.016  to  0.018  inch  thick)  or  aluminum  sheet  with  2 wraps,   around   entire   duct   circumference.      It   should extend   about   two   inches   laterally   in   each   direction beyond the damaged area or puncture. d. Hose Clamp.  Install enough hose damps (about five)    to    secure    repair    area.        Exercise    care    when tightening damps.  Overtightening may damage or crush the bleed air duct. 7-18.  ALUMINUM TUBING DAMAGE 7-17.  GENERAL  INFORMATION .    Aluminum  tubing  is subject    to    damage    by    projectiles    and    fragments. Replacement with original replacement parts is desirable, but not essential.  In BDAR, tubing and hose, AN  and  MS  fittings,  and  other  similar  components  can be  substitutes  one  for  the  other.    Available  time,  tools, skills, and materials will determine which repair option to use.  Whenever a line has complex bends, replacement of  the  damaged  section  with  MS  fittings,  OPTION  3,  is probably the quickest fix. 7-18.  LIMITATIONS .  None 7-19.  OPTION  1.    In  One  Repair  (damage  to  straight section of tubing). a. Materials/Tools Required: 2 Repair Fittings-Shape Memory Metal/Heat Shrink Splice Tube Tubing Cutter Knife or File Heat Gun b. Procedural Steps: (1) Cut    and    remove    damaged    section    of tubing, Figure 7-6.  Tube ends must be square. (2) Clean   ends   of   undamaged   tubing   with knife or file. (3) Measure   the   distance   between   the   two undamaged ends and prepare a tube splice replacement section  of  this  size.    Clean  ends  of  splice  section  as done in Step 7-19.c.(2). 7-7







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