TM 1-1520-240-BD 9-2. DAMAGE ASSESSMENT PROCEDURES. a. Wire   Identification.      The   most   difficult   and time   consuming   part   of   electrical   and   avionics   battle damage  assessment  is  wire  identification.    Added  and repaired wiring should be identified to aid in troubleshooting.    If  time  permits,  tape  or  sleeving  at each end of added pieces, may be used.  Use a material suitable   for   the   ambient   temperature   range.      Typical wire   and   circuit   identification   schemes   are   shown   in Figure 9-2. Figure 9-2.  Circuit Identification b. Circuits Identification.  The unit number and circuit designation letter identify the type of circuits.  The wire number  consists  of  one  or  more  digits.    It  is  used  to distinguish between wires in the same circuit.  The wire segment letter is used to distinguish between conductor segments   (a   wire   segment   between   two   terminals   or connections).  The wire size number is used to identify the AN or AL or the wire or cable.  The ground, phase, or thermocouple letter(s) are used as suffixes to the wire identification    code    to    further    identify    certain    wires. Ground  wires  are  identified  with  an  N  suffix.    Phase letters  A,  B,  or  C  are  added  to  identify  the  phase  of wires  that  are  in  the  three-phase  wiring  of  alternating current   (AC)   systems.      For   thermocouple   wire,   the following  suffixes  are  added  to  the  identification  code: AL (Alumel), CR (Chromel), FE (Iron), CN (Constantan), and CU (Copper). 9-3. DEFERMENT. Repair of systems and subsystems which are not critical to mission accomplishment,  may  be  deferred  if  safety  of  flight  is not    significantly    degraded.        Requirements    must    be examined  to  determine  if  relaxed  standards  for  repair and    aircraft    performance    can    be    accepted.        The commander may defer combat maintenance and battle- damaged   repair,   even   if   doing   so   places   operational limitations on the aircraft. SECTION III.  BATTLE-DAMAGE REPAIRS 9-4. INTRODUCTION .  The objective of electrical and avionics   system   battle-damaged   repair   is   to   restore damaged circuits which are essential.  It is also used to make nonessential circuits safe.  The repair procedures in this section are designed to quickly return an aircraft to a flyable condition. 9-5. ELECTRCTRICAL   AND   AVIONICS   REPAIRS . Electrical  and  avionics  equipment  receiving  significant battle   damage   will   usually   not   be   repairable.      The equipment  may  require  replacements  for  nonessential system  units  are  not  available,  the  technician  should, when possible, make the necessary repairs or adjustments  on  the  unit  for  one  more  combat  sortie. However,  avionics  wiring,  coaxial  cables,  and  general aircraft    wiring    can    be    repaired    using    a    variety    of procedures and materials.  Most of them are considered standard for temporary repairs. 9-6. ISOLATION OF NONESSFNTIAI SYSTEMS .  To isolate  damaged  nonessential  system  wiring,  crimp-on end  caps,  tape  or  any  other  insulating  method  may  be used.  Secure wires to some form of structure. 9-7. THE   ACM/BDR   WIRING   REPAIR   SET .      The wiring repair set contains the necessary tools, materials, and test equipment for the repair of all combat damaged U.S.  Army rotary-wing aircraft electrical wiring systems. Paragraph  9-7.a.  describes  the  wiring  repair  set,  and paragraph  9-7.b.  contains  general  instructions  for  using its four major subassemblies. a. Description.    The  wiring  repair  set  consists  of four major subassemblies (kits).  The kits are packaged in  militarized  fiberglass  cases  and  are  transportable  by one or more maintenance personnel. Each subassembly kit contains the necessary tools, materials, and  test  equipment  to  perform  a  specific  portion  of  the aircraft wire repair task.  Three kits are dedicated for use at the AVIM or AVUM areas as follows: 9-2