1、a ?. MIL-I-81683A 66 W 9999906 0343585 b W j5=9/-)3 SCOPE 1. - MIL- 1-81 683R(AS) +i.3-.5.5.3 1: . .1 .i 9- 3.5.5.4 3.5.5.5 -. 3.5.6 . _. 3.5.6.1 - -* I *. .= . 5 . :. -1 . . ;: - .i -. I:. - . :-Damping Liquid- The -dampini. :iiqujd .shall be sufficiently . colorless under- all. specified condi.ti.
2、ons to preclude interference .with visibi.l.ity. of. thebll. The viscosity shall be such that with the ball in motion at the zero mark, and the case tilted 12,-the time required for the ball to roll. from the zero mark to -the end of the tube shall be not.less than 0.5 second. . Sensitivity - The se
3、nsitivity shall .be such that the ball reaches its limit of travel when the indicator is rotated right or left 10 5 2 about the roll axis. Inclinometer Filling - No part of the air bubble shall be visible when the indicator is viewed from the posi- tion specified in 3.5.5.2. Rate-of-Turn - The rate-
4、of-turn display shall be in accordance with Figures 1 and 7. The design shall be such that the pointey is stable as practicable under rough air conditions and 1/29 vibration. normal operating position, the index shall move left or right in agreement with the polarity of the direct current received f
5、rom the remote rate-of-turn sensor. The scale shall conform to the path of the index so that there is a minimum of parallax. to either side of the center zero position shall be limited to 1/2 inch. At each of the fully deflected positions, a minimum of one-half of the index shall be in view when vie
6、wed at a horizontal distance of 2 feet from the center point of the display. Fixed mechanical stops shall be provided at the extreme deflection points to prevent pointer hangup on the case or mechanisms. Sensitivity Element - The sensitive element of the turn indicators shall be operated on 1 vdc (2
7、 vdc maximum input) applied to pins 26 and 27. The element shall be so mounted that it reacts only to turns about the vertical axis. Within The index deflection 16 Licensed by Information Handling Services. MIL-I-Lb3A bb 7977906 OLLi3bOL O I 3.5.6.2 *3.5.6.3 c *3.5.6.4 Pointer - The pointer shall be
8、 as shown on Figure 7. Scale - The turn rate scale shall conform to Figure 7. The colors shall be as specified in Table II. The distance between the indicator dial and the inside of the cover glass shall be held to a minimum and shall not exceed 1/4 inch at the zero position. TABLE I. Inclinometer T
9、ube Color. Marking Col or Visible Part of Two Wires on Black No. 37038 Front and Top Inclinometer Wire on each side of Inclinometer Black No. 37038 Incl inometer Background . White No. 37875 Al 1 Other Background Black 140. 37038 TABLE II. Turn Rate Scale Color. Color Marking Center Mark White No. 3
10、7875 Two Needle-width Deflection Marks White No. 37875 Pointer White No. 37875 Deflection (Pointer) - The deflection for a given input shall be as specified in the following table. The maximum voltage supplied to pins 26 and 27 shall be limited to 2 vdc. For left turns (cw deflection), the voltage p
11、olarity shall be positive (+) on pin 26 and negative (-) on pin 27. the voltage polarity shall be negative (-) on pin 26 and positive (+) on pin 27. needle width minimum. For right turns (ccw deflection), Oyer travel shall be 1/2 17 Licensed by Information Handling ServicesMIL-I-Lb3A 66 7779706 OLLi
12、3b02 2 .- .- 3.5.7 . .- i -“ - : :- *3.5.6.5 I . rate-of-turnindex shall be a maximum of .45 sec. Response Time f The response time (see 6.5.1) of the Flight Director Display - The flight director display shall consist of a vertical pointer and a horizontal . . .- I. - - : . .-. -. . . . j ., . . .(
13、31) Pitch Trim Test :i . . . (73) Rotor Coast Time . . (1-4) Inclinometer:,Tests . -(15) Rate-of-Turn TesFS Tests .t. - (1 2) Poher Consumption .L . 3. . +. . . . - (16) Vertical Category 4, Upper Test MTBF O - 2000 hours Lower Test MTBF 1 - 1000 hours Test Plan - Fix length test plan 20-6, Appendix Cy page 115, Figure C-19 of MIL-STD-781 Environmental temperature extreme shall be +55C and -44C. *4.4.3.1 The fol lowing conditions apply: MI L-STD- 781 The vibration level shall be .5g. 30 . .I Licensed by Information Handling Services
