MIL-PRF-38214D
3.4.6.4 Coating quality. The coating shall be uniform in quality and condition, clean, smooth,
and free from foreign materials, and physical imperfections (flaking, peeling, blistering,
blemishes, discolorations, stains, smears, and streaks) nor show evidences of a cloudy or hazy
appearance.
3.4.6.5 Abrasion resistance. There shall be no visible damage to the coated surface when rubbed
with a Standard # 2 pencil eraser with a force of 2 pounds.
3.4.7 Visibility. The filling liquid shall not obscure the card from the user (see 6.4.2).
3.4.8 Electrical power.
3.4.8.1 Type I & AQU-3A/SJP Compasses shall be powered by 5VDC unless otherwise
specified.
3.4.8.2 Type II Compasses shall be exclusively powered by 24VDC.
3.4.8.3 Type III Compasses shall be powered by either 5VDC or 24VDC as specified in 3.5.5.5.
3.5 Performance.
3.5.1 Reliability. The compass shall have a mean time between failures (MTBF) of at least
3,000 flight hours with a discrimination ratio of 2 and a confidence factor of 0.9.
3.5.2 Operational life. The compass shall have an operational life of at least 5 years.
3.5.3 Operation. When properly installed in the aircraft, the compass shall continuously indicate
the heading of the aircraft with reference to the magnetic field of the earth.
3.5.4 Weight. The compass shall weigh no more than 14 ounces.
3.5.5 Lighting. The compass shall incorporate an integral lighting system. The lighting system
shall permit replacement of incandescent bulbs or the lighting assembly.
3.5.5.1. Lamp location. Lamps shall be accessible from the front (dial side) of the instrument
case.
3.5.5.2. Lamp life. The lighting system lamps shall be designed for a life of 1,000 operating
hours.
3.5.5.3 AQU-3/A & AQU-3A/SJP (white light). The compass shall incorporate an integral
white lighting system using incandescent lamps or light emitting diodes (LED) as a light source.
3.5.5.3.1 Color. The color of the white portions of the indicator with a 4.5 ±0.050VDC power
applied to the lighting terminals shall have a chromaticity coordinates of x = 0.440±0.020 and y
= 0.405±0.020.
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