MIL-DTL-25308C
e.
Humidity relative humidity to 95 percent.
f.
Fungus fungus growth as encountered in tropical climates.
g.
Dust exposure to dry dust-laden atmosphere.
h.
Overpressure overpressure of 5,000 pounds per square inch (psi)
3.3.1 Tolerances. The gage shall operate within the tolerances specified in tables I and II.
TABLE I. Scale error tolerance, ąpsi.
Test Pressure (psi)
Dust
Low temp. operation
High temp. exposure
Room temp.
Low temp. exposure
Salt fog
High temp. operation
Humidity
Altitude
Vibration
0
50
75
100
500
50
100
125
1,000
50
100
125
1,500
50
100
125
2,000
50
125
150
2,500
50
125
150
3,000
50
125
150
3,500
75
125
150
4,000
75
125
150
TABLE II. Test Pressures and tolerances.
Test
Test Pressure (psi)
Tolerance (ąpsi)
Friction error all tests
----
75.0
Position error
2,000
30.0
Overpressure
5,000
80.0 + room temp tol
Seasoning
----
20.0 + room temp tol
Vibration
2,000
Pointer oscillation
100
Pointer variation
100
3.4 Part numbering of interchangeable parts. All parts having the same manufacturer's part
number shall be functionally and dimensionally interchangeable.
3.5 Case. The case shall consist of a body and a bezel ring and shall conform to figure 1. The
case body shall be made of either nonferrous, low-density metal or of a synthetic material, shall
be uniform in texture and shall have a smooth surface. The bezel and that part of the case visible
from the cockpit side of the instrument panel shall be finished in lusterless black per FED-STD-
595, color 37038. The remainder of the case may be finished in black and shall be adequately
5
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