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 SB 74-95-700
TRC 5OP
Table C3. Eye Lens
Eye
Surface
Number of
Size of
Area (see
Number of
Scratch
Maximum
Pits, Digs
Pits, or
note 1)
Scratches
Size
Length
or Bubbles
Bubbles
Up to 1.250
3
60
1/8
3
20
1.251-2, 000
5
60
3/16
5
20
2.001-up
8
60
1/4
8
20
Table C-4. Objective, Erect or Lenses, and Windows
Eye
Surface
Number of
Size of
Area (see
Number of
Scratch
Maximum
Pits, Digs
Pits, or
note 1)
Scratches
Size
Length
or Bubbles
Bubbles
Up to 1.250
5
60
3/16
4
40
1.251-2.000
8
60
1/4
7
40
2.001-up
10
60
5/16
10
40
Table C-. Reticle (see note 3)
Eye
Surface
Number of
Size of
Area (see
Number of
Scratch
Maximum
Pits, Digs
Pits, or
note 1)
Scratches
Size
Length
or Bubbles
Bubbles
Up to 1.250
3
60
1/8
3
10
1.251-2.000
3
80
3/16
3
20
2.001-up
3
80
1/4
3
40
NOTES
1 For defects in the outer zone (outside the central area of eye viewing surface) the allowable defects may be increased 50
percent and 50 per- cent in size.
2 Under no conditions will scratches, pits, etc., in the central area or eye surface (25 percent of area surface) be greater
than shown in the table.
3 No scratches, pits, lint, etc., which would significantly impact the intended use of the instrument shall be permitted in the
central area (25 percent or area at center line) of field lens where it would be superimposed on the reticle pattern.
4. For definition of the size numbers, see MILO-13830 and Drawing C7641866.
(13) Conduct manual functional tests.
As
the classification of this defect and corrective action.
applicable, manually function or operate the controls
(1) The pressure test will be performed utilizing
(knobs,
levers, door handles, covers, sleeves,
either a Pressure Tester. Two Station, NSN 4931-00-
extendable legs, etc.). In the event item fails to function
065-2018 Purge Kit Fire Control, or a suitable substitute.
classify the item as a major defective.
(2) Refer to Operators Maintenance Manual for
b. Pressurized Items.
installation and removal procedures as well as test
NOTE
adjustments after installation.
Pressurized items are identified by the
(3) With the pressure gage installed, allow 10
presents of ports, a gray color band of
minutes for pressure to stabilize, then check the
the inlet and a yellow color band for the
pressure reading. The pressure should be within 0.1
outlet. Prior to the physical nitrogen
pounds per square inch (PSI) of the item TDP. Should
the pressure reading be less than that required, but more
pressure test of the item, the test
equipment system will be purged and
than 0.5 PSI, this condition shall be classified as a minor
charged in accordance with TM750- 116
defect. Should the pressure reading be less than 0.5
or applicable specifications to eliminate
PSI, the item shall be classified as a major defective. All
erratic readings.
readings should be taken at the same atmospheric
CAUTION
conditions and barometric pressure as that of the area
Do not open, vent, or purge any
the
test
was
performed.
instrument containing a radioluminous
source if there is no illumination in the
assembly.
Radioluminous items, for
C-3
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