TM 55-1520-228-BD
AIRFRAME
a.
the damage appears to be
deferrable;
b.
a detail assessment can be made
and the damage can be repaired by BDAR
techniques within the time available to
return the aircraft to service in the
ongoing battle;
an adequate assessment can be made
and the damage can be repaired by BDAR
techniques to enable the aircraft to
self-recover;
d.
a detail assessment cannot be
made and/or the damage cannot be re-
paired by BDAR techniques within the
available time. The aircraft shall be
scheduled for standard repair.
e. The aircraft is damaged beyond
repair, and he shall arrange for its
disposition (i.e., recovery, can-
nibalization, or destruction).
4-6.
DETAIL ASSESSMENT.
a. Access to Damaged Structure.
Locate all damage to airframe primary
structure.
Remove access panels,
covers, and fairings in the damaged
area.
Remove aircraft components as
required to inspect the structure.
Use
the location of entrance and exit wounds
and the estimates of projectile paths to
determine the areas where damage may be
present and access to interior inspec-
tion will be needed. If an area of
structure suspected of being damaged
cannot be reached by other means, cut
small inspection holes in the exterior
skin. Then inspect internal members
with an inspection light and mirror.
b.
Inspecting for Cracks.
(1) Inspect for cracks caused by
impact or penetration in regions away
from the site of primary damage.
(2) Inspect for small and large
cracks caused by projectile damage.
Small cracks will enlarge under con-
tinued loading, particularly when
located at the edge of a hole.
(3) Locate cracks in primary
structure using magnifying glass or dye
penetrant.
Check for cracks around
fasteners in areas showing signs of
overstress.
(4) Inspect for cracks in all
areas of an explosion caused by a high
explosive incendiary (HEI) strike.
c.
Inspecting for Structural Changes.
(1) Inspect damaged area and
surrounding undamaged area for evidence
of buckling, crippling, and misalign-
ment. Kinks, wrinkles, and sheared,
pulled-through or missing fasteners on
skin panels are indications of struc-
tural changes by an HEI hit.
(2) Inspect structural changes in
the form of buckling, crippling, and
misalignment caused by overpressure.
These structural changes are noticeable
in areas where one structural member may
have to support the load of another
broken member. Check damaged area to see
if there is interference with mechanical
moving components.
(3) Use a straight edge to examine
the component for twisting or bowing.
d.
Inspecting for Embedded
Projectiles and Fragments.
(1) Inspect for embedded projec-
tiles which can create the same affect
as a hole or crack on a tension member.
(2) Inspect for embedded projec-
tiles and fragments in areas which have
suffered HEI damage. The inspection
will reveal that a solid projectile is
embedded or has broken apart, striking
internal components.
4-4
c .
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