MIL-PRF-38135C(USAF)
3.5.15 Limitation of pointer movement. The airspeed pointer movement shall be limited to 358°
of clockwise rotation from the no pressure position.
3.5.16 Lighting characteristics. The lighting characteristics (intensity and color) shall be as
specified by the procuring activity (see 6.2), and shall operate on 5Vac.
3.5.17 Damping. The time for the pointer to go from full scale to 120 knots shall be between 0.8
and 2.0 seconds (see 6.4).
3.5.18 Weight. The indicator shall weigh 1.25 pounds or less.
3.5.19 Dial. The dial shall conform to figure 2.
3.6 Item identification. The indicator shall be permanently and legibly marked with the following
information:
a.
Manufacturer's name.
b.
Manufacturer's CAGE code.
c.
Manufacturer's part number.
d.
Manufacturer's lot number.
e.
National Stock Number (NSN).
f.
Date of manufacture.
3.7 Interchangeability. All parts having the same manufacturer's part number shall be
functionally and dimensionally interchangeable.
3.8 Environmental conditions.
3.8.1 Temperature. The indicator shall operate from -65° to 160°F with a scale error of ±5 knots
in addition to the scale error in table II.
3.8.2 Vibration.
3.8.2.1 Vibration error. The indicator shall withstand vibration at an amplitude of 0.003 to 0.005
inch at a frequency of 500 to 3,000 Hz with an error less than 5 knots at an IAS of 200 knots.
3.8.2.2 Vibration tolerance. The indicator shall withstand vibration at an amplitude of 0.018 to
0.020 inch at frequencies of 1,000, 2,000, and 3,000 Hz for a period of 3 hours with an error less
than 5 knots at an IAS of 200 knots.
3.8.2.3 Resonance. The indicator shall have no resonant frequency between 500 and 3,000 Hz.
3.8.3 Humidity. The indicator shall operate in humidity up to 95 percent.
3.8.4 Acceleration. The indicator shall operate with applied acceleration forces up to 20g.
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