1、MIL-A-2767LB 66 9777906 OL355q Y W c-/5-07 MIL-A-27671B(USAF) 16 August 1965 Superseding MIL-A-27671A(USAF) 16 April 1962 MILITARY SPECIFICATION AMPLIFIER-INDICATOR GROUP, ALTITUDE -VERTICAL SPEED A/A24G-ll 1. SCOPE 1.1 This specification establishes the requirements for one type of aircraft altitud
2、e vertical speed amplifier-indicator group, designated A/A24G-ll. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effecton date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. c SPECIFICATIONS Federal QQ-P-416 Pla
3、ting, Cadmium (Electrodeposited) PPP-B-636 Box, Fiberboard Military MIL-P-116 MIL-C-675 MIL-C-5015 MIL-E-5272 MIL-E-5400 MIL-1-6181 MIL-S-7742 MIL-A-8625 MIL-M-26512 MIL-R-26667 MIL-L-27160 MIL-C-38037 MIL-D-7032 7 Preservation, Methods of Coating of Glass Optical Elements (Anti-Reflection) Connecto
4、rs, Electrical, “AN Type Environmental Testing, Aeronautical and Associated Equipment, General Specification for Electronic Equipment, Aircraft, General Specification for Interference Control Requirements, Aircraft Equipment Screw Threads, Standard, Optimum Selected Series, General Specification for
5、 Anodic Coatings, for Aluminum and Aluminum Alloys Maintainability Program Requirements for Aerospace Systems and Equipment Reliability and Longevity Requirements, Electronic Equipment, General Specification for Lighting, Instrument, Integral, White, General Specification for Computer, Central Air D
6、ata CPU-43/A Drawings, Engineering and Associated Lists f I THIS DOCUMENT CONTAINS - 48 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS Federal FED-STD-595 Colors Military MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-704 Electric Powe
7、r, Aircraft, Characteristics MS17322 M S3 3 55 8 MS33586 Metals, Definition of Dissimilar Marking for Shipment and Storage Identification Marking of U. S. Military Property Specifications and Standards Order of Precedence for the Selection of and Utilization of Meter, Time Totalizing Miniature, 400
8、Cycle, Digital Numerals and Letters, Aircraft Instrument Dial, Standard Form (Copies of documents required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) * 2.2 Other publication. The following
9、document forms a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. Aeronautical Radio, Incorporated Standard ARINC 545 Subsonic Air Data Computer System (Copies of the ARINC d
10、ocument may be obtained from Aeronautical Radio, Incor- porated, 1700 K Street, N. W., Washington-6, D, C.) 3. REQUIREMENTS 3.1 Preproduction. This specification makes provisions for preproduction testing. 3.2 Components, The amplifier-indicator group shall consist of Indicator, Altitude-Vertical Sp
11、eed AAK-15/A24G-l1 Amplifier, Electronic Control ASK-ll/A24G-ll. 3.3 Selection of specifications and standards, Specifications and standards for necessary commodities ad services not specified herein shall be selected in accordance with MIL-STD-143. 2 Provided by IHSNot for ResaleNo reproduction or
12、networking permitted without license from IHS-,-,-NIL-A-27673B bb W 77779Ob 0335550 I? m MIL-A-27 671B (USAF) 3.4 Materials 3.4.1 Materials that are nutrients for fungi shall not be used where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated with a fungici
13、dal agent. if used within a hermetically sealed enclosure, fungicidal treatment shall not be required, Fungus-proof materials. 3.4.2 Metals. Metals shall be of the corrosion-resistant type or suitably treated to resist corrosion due to conditions likely to be encountered in storage or normal service
14、. 3.4.2.1 Dissimilar metals. Unless suitably protected against electrolytic cor- rosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in MS33586. 3.4.3 Nonmagnetic materials. of the instrument , except where magnetic materials are essential,
15、Nonmagnetic materials shall be used for all parts 3.4.4 Protective treatment. Materials that are utilized within the hermetically sealed case of the indicator and amplifier shall be considered suitably protected against corrosion. 3.4.5 Toxic and corrosive fumes. The materials, as installedandunder
16、specified service conditions, shall not liberate gases or fumes which will result in such corrosion as to cause malfunction of equipment or discoloration of dials or indicia, nor shall toxic gases or fumes that are detrimental to performance of the aircraft or health of personnel be liberated under
17、the service conditions specified herein. 3.5 Design and construction. The AAK-l5/A24Gll indicator andASK-ll/A24G-11 amplifier shall be designed and constructed in accordance with figures 1 through 7, and shall have maximum reliability consistent with the requirements and minimum weight specified her
18、ein. * 3.5.1 Power requirements. The amplifier-indicator group shall meet all appli- cable requirements of MIL-STD-704 and ARINC 645 and shall operate from the power defined therein. The power requirements shall be as follows and shall not exceed the indicated amounts: A-C power Operating limits: 10
19、2 to 124V Standby voltage limits or emergency supply: Operating frequency limits: 380 to 420 cps Standby frequency limits or emergency supply: Maximum operating volt-amperes: 63 Maximum warmup time: 90 to 130V 380 to 420 cps 1 -minute if temperature has been at -35“ C or higher and 3 minutes if temp
20、erature has been at -55“ C, 3.5.2 Desim life. The system shall be designed for a reliable life of at least 1,000 hours without servicing and-a minimum operating life of at least 2,000 hours Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-27h72B
21、 66 W 7777706 0135551 4 O B- C- H K F- G- F- DA PM 400 COMMAND -tN P 8 50 FIGURE 1 Altitude - Vertical Speed 4 FOR DETAILS SEE FIGURE 2 20 “15 IO 8r 6 5 4 3 VERTICAL SPEED TAPE Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-A-27671B 66 M 7777706
22、 0335552 b A B C D E F G H I J K L M N O P Q R S T U Triangular index moves under fixed reference. Vertical base is 3/8 long and chord is 7/32. Center, black with 1/16 white border 3/16 White numerais Black durable duil Black on black 7/32 High white numerals, except -1,000 shall be red 3/16 White n
23、umerais 3/32 White 1/8 High white numerals Red 3/16 X 9/16 black letters O ,030 White 5/32 White Black tape white 1/8 White Black 7/32 White numerals 1/4 White numerals Bar0 set knob 7/8 X 1/2 Dia, gray with black face Spring centered switch - gray 3/16 White, except -1,000 shall be red 1/8 Total wi
24、dth white marker with 0.030 black centerline. Stroke width of numerals and grads 1/16 to 1/8 of height Width of numerals to be 3/5 of height Letters and numerals shall conform to MS33558 All colors conform to FED-STD-595, except red Black - Color No. 37038, White - Color No. 37875, Gray - Color No.
25、36231, as applicable Red - Red Fluorescent 116-1548 (Switzer Brothers, Cleveland, Ohio, or equal). DIMENSIONS IN INCHES FIGURE 2. Nomenclature List 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c MIL-A-27671B 66 7777706 0335553 m I 3 8.000 -+ VI-
26、 -3.125 - WHEN REQUIRED, ARE REMOVABLE I_ 3 3% DIMENSIONS IN INCHES TOLERANCES FRACTIONS 21/32 DECIMALS 5 .O10 FIGURE 3. Case, Altitude Vertical Speed Rear 2.5 at 25“ C, resolution 0.01 percent. 22 i-. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
27、,-. MIL-A-27673B 66 W 9777706 0335570 4.3.1.6 Test synchros. The synchro transmitters used to provide indicator input functions shall be accurate to within h0.1“ either by selection or calibration, 4.3.1.7 Test potentiometers. The potentiometers used to provide indicator input functions shall have a
28、 linearity of at least 0.005 percent. 4.3.1.8 Standard test amplifier. The standard test amplifier shall be a standard production amplifier which has successfully passed all individual tests. The indicator synchros shall be so oriented electrically that the altitude function will be servoed to the f
29、ollowing indication when a standard test transmitter is set at electrical zero and connected to the indicator and amplifier as follows: *4.3.1.9 Electrical zero and rotation reference. Electrical Zero Function Indicator reading with Standard test transmitter pin transmitter set at EZ connections H C
30、 X Y Z Altitude O feet, 26V Cold L/19PW N/19PW P/19PW The pins of the amplifier connector shall be connected to the identically lettered pins of the indicator connector. The altitude coarse synchro shall be checked simultaneously with the fine synchro. After the function is servoed to the EZ point b
31、y the fine synchro, the coarse synchros shall be excited as shown on figure 10. The vacuum-tube voltmeter must indicate less than 0.150V. A c-w rotation of the standard test transmitter rotor (viewed from the shaft end) shall cause increasing function. A standard test transmitter is as follows: The
32、rotor leads shall be arbitrarily labeled H2 and C2 and one stator lead arbitrarily labeled Z2. The Z2 lead shall be connected to C2 and 26V400 cps applied across H2 - C2. At electrical zero, a null voltage shall be measured across the two wilabeled stator leads (Vi). The voltage between H2 and eithe
33、r of the unlabeled stator leads shall be approximately 15V (V2). If this voltage is 15V (approximate), the synchro is 180“ away from EZ (see figure 11). If c-w rotation (viewed from the shaft end) of the synchro rotor causes V3 to increase (within 30“ of EZ), V3 is between X2 and Z2; if the voltage
34、decreases, V3 is between Y2 and Z2. 4.3.1.10 Potentiometer zero. Unless otherwise specified, the low end of the potentiometer shall correspond to the low end of the function. 4.3.2 Amplifier 4.3.2.1 Test equipment. The test equipment shall not load or affect the normal operation of the amplifier. Th
35、e tolerances specified are acceptable limits of performance and are n6t to be confused with meter accuracies. The following instruments or their equivalents may be used: a. Vacuum Tube Voltmeter Model.4OOC Hewlett-Packard Co. Palo Alto, California 23 Provided by IHSNot for ResaleNo reproduction or n
36、etworking permitted without license from IHS-,-,-b - MIL-A-27673B bb 777770b 0335573 T MIL-A-27671B(USAF) IOV 400% 4 INDICATOR 1. ID VTVM - FIGURE 10. Altitude Coarse Synchro 24 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-, MIL-A-2767LB 66 777770
37、b 0135572 L MIL-A97 67 1B(USAF) V, -VACUUM TUBE VOLTMETER V, - i000 OHMS/ VOLT VOLTMETER V, - 1000 OHMSIVOLT VOLTMETER FIGURE 11. Electrical Zero Circuit 25 . ai . , . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-27671B bb m 9999906 0135573
38、3 m b, Megger, James Biddle Co. PhiIadelphia, Pennsylvania c. Cathode-Ray Oscilloscope, Type 304A Allen B. Dumont Labs, Inc. Clifton, New Jersey Radio Corporation Harrison, New Jersey Eclipse-Pioneer Teterboro, New Jersey 4.3.2.2 Test position. in its normal operating position. d. Vdtohmmeter-Senior
39、 Volt Ohmyst WV-98A e. Phase Comparator, TES 113-4-A Unless otherwise specified, the amplifier shall be tested 4.3.2.3 Power supply 4.3.2.3.1 Wbere normal excitation is specified, it shall be 115 *3V rms 400-cps single-phase source with a total harmonic distortion less than 5 percent and a frequency
40、 deviation less than 1 percent, and capable of supplying 150 va min- imum. 4.3.2.3.2 ,Phase. A voltage specified as being “from pin X topinY“ shall be measured using pin X as the reference or ground terminal. The direction of leading phase angle can be established by use of the following circuit: In
41、 this circuit, the voltage from pin 1 to pin 3, V13, leads the voltage from pin 1 to pin 2, V12. All phase measurements shallbe taken with respect to the a-c excitation measured from pin J to pin K on connector PT02A-12-10P. 4.3.2.4 A-C simal source. The 400-cps source shall have the following chara
42、c- teristics : a. Output impedance - not to exceed 1,000 ohms b. Voltage range - O to 1V continuously variable c. Phase - O“ and 180“ 13“ selectable d. Distortion - less than 5 percent. 4.3,2,5 Load. The load (Z) specified herein shall be 155& ohms 11 percent, measured at 26V 400 cps. *I i I 26 Prov
43、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-27671B bb EM 9999906 0135574 5 MIL-A-27 6 7 1B(USAF) 4.4 Preproduction testing 4.4.1 Test samples. The test samples shall consist of three indicators and three amplifiers representative of the product
44、ion equipment. Samples shall be identified with the manufacturers part number and such other information as required by the procuring activity. The samples that were tested shall be submitted to the procuring activity. 4.4.2 Preproduction tests. specified under 4.6. The preproduction tests shall con
45、sist of all the tests 4.5 Acceptance tests. Acceptance tests shall consist of: a. Individual tests b. Sampling tests. 4.5.1 Individual tests. following tests as described under 4.6. Each indicator and each amplifier shallbe subjected to the 4.5.1.1 Indicator a. Examination of product b. Functional c
46、heck c. Synchro correspondence d. Case leakage e. Dielectric f. Lighting (visual comparison) g. Scale error h. Slew speed i. Position error j. Warning flag k. Friction. 4.5.1.2 Amplifier a. Examination of product b. Leakage test c. Functional check d. Insulation breakdown e. Insulation resistance f.
47、 Voltage and current measurements g. Power consumption h. Signal channel measurements. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- , MI-L-A-2767LB 66 m 7977706 0335575 7 m MIL-A -2 7 6 71 B( USAF) 4.5.2 Sampling tests 4.5.2.1 Sampling plan A. On
48、e amplifier and one indicator shall be selected at random from each 100 or less produced on the contract or order and subjected to the following tests as described under 4.6. 4.5.2.1.1 Indicator a. Individual tests b. Scale error at -55C c. Scale error at 71C d. Vibration error e. Frequency response
49、 f. g. Stray light. 4.5.2.1.2 Amplifier a. Individual tests Sampling plan A of MIL-L-27160 b. Low temperature operation c. High temperature operation d. Vibration. 4.5.2.2 Sampling plan B. Unless otherwise specified, 3 indicators and 3 amplifiers shall be selected at random from the first 15 items on the contract or order and subjected to the f
