MIL-PRF-38135C(USAF)
3.4.4 Electrical connector. The electrical connector shall conform to figure 1.
3.4.5 Dial markings. All dial markings shall be permanently and legibly marked and shall conform
to figure 2 and table I. All letters and numbers shall conform to MS33558. All markings not
otherwise specified shall be finished in lusterless black, color number 37038 of FED-STD-595.
TABLE I. Dial markings
Marking
Height or length
Width
Color
(see note 3)
Numerals
0.140
0.020
lusterless white, 37875
100-knot graduations
0.171
0.020
lusterless white, 37875
50-knot graduations
0.156
0.020
lusterless white, 37875
10-knot graduations
0.140
0.015
lusterless white, 37875
USAF
0.047
0.020
lusterless black, 37038
AVU-19/A
0.047
0.020
lusterless black, 37038
AIRSPEED
0.047
0.020
lusterless black, 37038
KNOTS X 100
0.093
0.020
lusterless white, 37875
NOTES: 1. All dimensions are in inches.
2. Tolerances: height or length ±0.016; width ±0.005.
3. All color numbers are according to FED-STD-595.
4. Height refers to characters; length refers to graduations.
5. USAF, AVU-19/A, and AIRSPEED shall be in raised lettering
3.5 Performance.
3.5.1 Operation. The indicator shall display the indicated airspeed (IAS) as a function of the
difference between pitot and static pressures.
3.5.2 Maintainability. The indicator shall be repairable without the use of special tools.
3.5.3 Reliability. The indicator shall have a mean time between failures (MTBF) of 1,200 hours.
3.5.4 Range. The indicator shall display the IAS over a range of 60 to 850 knots. The pointer
shall move continuously (without ratcheting) while indicating IAS.
3.5.5 Overpressure. The indicator shall withstand overpressure of 10 inches of water at the static
port and 73 inches of Hg at the pitot port
3.5.6 Magnetic effect. The indicator shall cause a free compass to deflect no more than 1° when
revolved about a short-bar magnetic compass with a field intensity of 0.17 to 0.19 oersted.
3.5.7 Case leakage. The case leakage shall cause a change of pressure of no more than 0.01 inch
Hg per minute.
4
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