MIL-DTL-83361B
3.3.3.1 Pointer mechanism. The indicator shall be provided with two pointers that shall
be attached to the concentric shafts so that the rear pointer will be actuated from the front
synchro and the front pointer will be actuated from the rear synchro. The direction of rotation of
the synchro shafts, as viewed from the end at which the pointers are attached, shall be clockwise
with increasing pressure.
3.3.4 Dial. The dial shall conform to figure 2. A minimum diameter of 1.75 inches shall
be maintained across the outside ends of the graduations.
3.3.4.1 Dial markings. The following markings shall be finished in durable white
conforming to FED-STD-595 color number 37875. The dimensions of the markings shall be as
specified in table I.
TABLE I. Dimensions for dial markings.
Height or length
Width of line or graduation
Marking
inch ± 0.015
inch ± 0.005
Numerals 0, 20, 40, 60, 80, 100
0.125
0.016
10-pound graduations
0.200
0.025
Graduation at 50 psi
0.200
0.037
Lettering, "OIL PRESS"
0.125
0.160
Lettering, "PSI"
0.093
0.015
5-pound graduations
0.093
0.015
3.3.4.2 Other markings. The marking, "EGU-18/A", shall be permanently and legibly
marked on the dial in letters 0.062 inch high. Position of this marking on dial face is at the
discretion of the manufacturer. This marking and the color of all other markings not otherwise
specified shall be finished in durable dull black conforming to FED-STD-595 color number 37038,
durable gloss black conforming to FED-STD-595 color number 17038, or durable dull white
conforming to FED-STD-595 color number 37875.
3.3.4.3 Dial visibility. Portions of the minor graduations of the dial shall be visible when
viewed from any position within the frustrum of a cone, which is the side that intersects the outer
edge of the coverglass and makes an angle of 30 degrees with the perpendicular through the
center of the dial.
3.3.4.4 Dial-to-coverglass distance. The distance between the indicator dial and the
inside of the coverglass shall be the minimum practicable and shall not exceed 0.188 inch.
3.3.5 External bonding. Provisions shall be made for electrically bonding the indicator
case to the aircraft structure. Bonding shall be in accordance with MIL-STD-464.
3.3.6 Coverglass. The coverglass shall be clear, flat, and free of flaws that would
interfere with the normal reading of the instrument. The thickness of the coverglass shall be the
minimum practicable and entirely suitable for the purpose. The coverglass shall be provided
with a reflection-reducing coating conforming to MIL-C-14806.
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