TB 55-1560-276-24/1
m e t h o d of detection, look through the
NOTE
s u s p e c t e d area at some distant object.
T h e object should appear undistorted.
Excellent lighting is imperative.
B r i g h t sunlight may be used if
NOTE
possible.
This object should be at a
dis-
t a n c e of approximately 30
feet
( a ) If the suspected area has been
and illuminated from behind.
The
removed from the aircraft, hold
crossed bars of a window
are
it at arms length and look
i d e a l , however a pole or a
tree
Move it slowly
through it.
will suffice.
and
vertically.
horizontally
b. Minor scratches can be readily detected with
The object should retain its
t h e fingernail.
s h a p e and
original
clarity
throughout all movements.
c. Deep scratches can be readily detected with
the fingertip.
(b) lf movement of the object is
d. Fractures which include chipping, very deep
impractical, then a slow move-
a b r a s i o n s , or crazing are readily detected visually or
ment of the head will suffice.
with the fingertip.
(2) When using t h e n a k e d e y e d i s t a n t
3