TM 1-1500-204-23-4 (15) Ensure   tape   or   cord   are   not   used   for primary support. (16) Ensure   drain   holes   are   present   in   drip loops or lowest portion of tubing placed over wiring. (17) Check that wires and cables are routed in such a manner that chafing will not occur. (18) Ensure wires and cables are positioned in such  a  manner  that  they  are  not  likely  to  be  used  as handholds,  or  as  support  for  personal  belongings  and equipment. (19) Check that wires and cables are routed so that   they   are   not   exposed   to   damage   by   personnel moving in the aircraft. (20) Check  that  wires  and  cables  are  located so as not to be susceptible to damage by the storage or shifting of cargo. (21) Check that wires and cables are routed so that   there   is   no   possibility   of   damage   from   battery leakage or any other fluids. (22) Ensure  wires  and  cables  are  adequately protected in wheel wells or other areas where they may be exposed to damage from impact of rocks, ice, mud, etc.  If re-routing of wires or cables is not practical, it is permissible to install metal shielding or insulating tubing. This should be held to an essential minimum. (23) Ensure  wires  and  cables  routed  within  6 inches  of  any  flammable  liquid  or  fuel  line  are  closely and rigidly supported, and are not attached to fuel lines. Ensure   wires   and   cables   are   routed   above   fluid/fuel lines. (24) Ensure  a  trap  or  drip  loop  is  provided  to prevent  fluids  or  condensed  moisture  from  running  into wires   and   cables   dressed   downward   to   a   connector, terminal block, panel, or junction box. (25) Ensure    wires    and    cables,    installed    in locations  where  fluids  may  be  trapped,  are  routed  as high  as  possible,  and  protected  with  insulating  tubing when this is not possible. (26) Check   that   wires   and   cables   are   kept separate   from   high   temperature   equipment,   such   as resistors, tailpipes, heating ducts, and deicers. (27) Ensure  the  minimum  radius  of  bend  for wire or cable is 10 times the outside diameter of the wire or  cable,  except  that  at  the  terminal  strips  where  the wire is suitably supported, the radius may be 3 times the diameter of the wire or cable.  Where it is impractical to install wiring or cable within the radius requirements, the bend shall be enclosed in insulating tubing. (28) Ensure  coaxial  cables  are  not  bent  at  a radius  of  less  then  6  times  the  outside  diameter  of  the cable. (29) Check  that  wires  and  cables  attached  to assemblies where relative movement occurs (such as at hinges  and  rotating  pieces,  particularly  control  sticks, control wheels, columns and flight control surfaces) are installed   or   protected   in   such   manner   as   to   prevent deterioration   of   the   wires   and   cables   caused   by   the relative movement of the assembly parts. (30) Ensure wires and cables are provided with enough slack to meet the following requirements: · Permit ease of maintenance. · Allow  replacement  of  terminals  at  least  two  times, except  for  sizes  AN-2  and  AL-4  and  larger  where only one replacement should be made. · Prevent   mechanical   strain   on   the   wires,   cables, junctions and supports. · Permit free movement of shock-and-vibration mounted equipment. · Allow shifting of equipment as necessary to perform alignment, servicing, tuning, removal of dust covers, and changing of tubes, while installed in aircraft. (31) Check  that  unused  wires  are  individually dead-ended,   tied   into   a   bundle,   and   secured   to   a permanent  structure.    Each  wire  is  to  have  strands  cut even   with   insulation   and   a   pre-insulated   closed   end connector, or a 1-inch piece of insulating tubing placed over wire with its end folded back and tied. (32) Check    that    shielding    is    in    place    and properly fastened. 3-2