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Figure 2-4.  DA Form 2404
Figure 2-6.  Damaged Cross Section

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 (7)       Inspecting    for    Broken    and    Missing Fasteners. (a)  Fastener Damage or Loss.  Some fasteners join parts together in an assembly, and some join one structural member to another.  Sheared, pulled- through,   torn-out,   elongated   fastener   holes,   and   the damage  or  loss  of  fasteners  can  severely  weaken  the soundness of a structure. (b)     Riveted     and     Bolted     Joints. Inspect   all   riveted   and   bolted   joints   near   the   battle damage.      Look   for   sheared,   pulled-through,   tom-out fasteners,   and   elongated   fastener   holes.      Carefully inspect   members   showing   signs   of   structural   change and for fasteners with chipped or cracked paint.  Where possible,   inspect   fasteners   from   both   sides.      Clearly mark  and  record  all  damaged  fasteners  on  DA  Form 2404 (Figure 2-4). (8)  Inspecting for Delaminations.   To verify suspected  damage  to  honeycomb  structures,  use  coin tapping    methods    to    determine    size    and    shape    of disbonds/delaminations. NOTE Resonation   of   coin   tapping   on   the structure  will  determine  hollowness or existence of delaminations. (9)  Marking and Recording Damage. (a)      Damage   Recording.      Accurate recording   of   damage   is   an   important   part   of   battle damage  assessment.    Record  all  detected  damage  on DA   Form   2404   (Figure   2-4).      Determine   allowable damage limits.  Establish an order of repair on DA Form 2404  (Figure  2-4).    Record  individual  areas  of  damage to a single structural element separately on the form.  If a structural member is massively damaged or severed, recording individual areas of damage is unnecessary. (b)      Damage   Diagrams.      Show   the location    and    extent    of    damage    on    copies    of    the diagrams  given  in  this  chapter.    The  damage  can  be drawn   by   hand.      Accurately   locating   damage   on   a diagram    will    greatly    help    the    damage    assessment procedure. (c)       Marking    Damage.        Mark    the damaged structure using grease pencil or paint.  Use the labeling scheme given in Figure 2-5. Figure 2-5.  Measuring Cap or Longeron Damage 2-9







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