MIL-PRF-27197E
TABLE I Marking dimensions.
Width of line
Height or length
or graduation
Marking
(±0.016)
(±0.005)
Numerals on IAS dial
0.250
Numerals on mach scale
0.5 through 1.6
0.156
1.8 through 2.2
0.125
Graduations corresponding to 100 knot increments
As shown On Figure 3
Graduations corresponding to 50 knots increments
below 400 knots (except 150)
0.219
0.030
above 400 knots
0.156
0.030
Graduations corresponding to 150knots increments
0.125
0.030
Graduations corresponding to 10 knot increments
0.156
0.020
Graduations corresponding to 0.10 mach increments
0.125
0.030
Graduations corresponding to 0.05 mach increments
0.094
0.020
Lettering MACH NO.
0.094
0.020
Lettering KNOTS X 100
0.094
0.020
Zero graduation
0.125
0.020
Lettering SET INDEX
0.078
0.020
Shaded portion of IAS pointer
As shown on Figure 5
Settable index pointer
As shown on Figure 5
Note: All dimensions are in inches.
3.4.14 Black markings. USAF, classification, and MACH NO, & IAS shall be permanently and
legibly marked as specified in Figure 5. These markings, all backgrounds, and all other markings
shall be finished in lusterless black, color number 37038 of FED-STD-595.
3.4.15 Dial visibility. The pointer, numerals, at least 0.063 inch of the shortest graduations, and
other specified markings on the dial shall be visible from any point within the frustum of a cone,
the side of which makes an angle of 30o from perpendicular to the dial, where the small diameter
is the aperture of the indicator case.
3.4.16 Pressure fittings. Pitot-static pressure and static pressure fittings shall be as shown on
Figure 1.
3.5 Performance.
3.5.1 Airspeed and mach number equations. Airspeed equations, mach number equations, and
the relationship between pressure and altitude shall be in accordance with NASA Technical Note
D822.
3.5.2 MAEAS pointer adjustment. The MAEAS shall be adjustable by an adjustment on the
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