1、BRITISH STANDARD BS G193:1966 Specification for Aircraft lampholders UDC 629.13.066:621.316.58BSG 193:1966 This BritishStandard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman ofthe Engineering Divisional Council, was published under theauthority of th
2、e General Council of the Institution on 17 January1966 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/52 Draft for comment D62/10279 ISBN 0 580 34542 4 Foreword This BritishStandard has been prepared at the request of the aircraft industry to sta
3、te the requirements for bayonet lampholders suitable for use in aircraft lighting installations. The requirements for bi-pin fluorescent tube holders and for lampholders suitable for use at altitudes above10000ft are under consideration. Reference to the following BritishStandards is required: BS2G1
4、00, General requirements for electrical equipment and indicating instruments for aircraft. BS G181, Electric lamps for aircraft. BS52, Bayonet lamp-caps, lampholders and B.C. adaptors (lampholder-plugs) for voltages not exceeding250volts. A British Standard does not purport to include all the necess
5、ary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to
6、5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSG 193:1966 BSI 02-2000 i Contents Page Foreword Insid
7、e front cover 1 Scope 1 Section 1. Design requirements 2 Materials and finish 1 3 Dimensions 1 4 Construction 1 5 Electrical performance 1 6 Environmental requirements 1 Section 2. Tests 7 General 1 A. Type tests 8 General 2 9 Physical check 2 10 High voltage test 2 11 Insulation resistance test 2 1
8、2 Contact resistance test 2 13 Compass interference test 2 14 Vibration test 2 15 Acceleration test 2 16 Climatic test 2 B. Production tests 17 Contact pressure tests 3 18 High voltage test 3 19 Insulation resistance test 3 C. Quality tests 20 Selection of samples 3 21 Inspection 3 22 Contact resist
9、ance test 3 23 Conditions of compliance 3 Figure 1 Typical B15s lampholder and fixing clip 4 Figure 2 Typical B9s lampholder 4 Figure 3 Dummy lamps 5 Table 1 2 Table 2 3ii blankBSG 193:1966 BSI 02-2000 1 1 Scope This BritishStandard specifies the performance and quality requirements for bayonet lamp
10、holders for aircraft lamps having single centre contact (B15s) caps and miniature centre contact (BA9s) caps, intended for use in atmospheric pressures down to522 millimetres of mercury equivalent to an altitude of10000ft(3048 m). The lampholders are suitable for use on systems of nominal voltages u
11、p to28volts; they may be used on other nominal voltages subject to the following individual maximum limitations, which apply independently of each other: B15s:2amp,250V r.m.s. a.c.,60watts. BA9s:1amp,50V r.m.s. a.c.,10watts. Although BA lampholders are not recommended for general use in circuits ope
12、rating at more than50volts, with neon indicator lamps BA9s lampholders may be used on nominal system voltages up to200V r.m.s. a.c., subject to a series ballast resistor being connected externally to the centre contact of the lampholder. Outline drawings of preferred lampholders are shown, but these
13、 are not intended to restrict the development of types offering alternative installational facilities such as batten mounting. Section 1. Design requirements 2 Materials and finish a) The shells of the lampholders shall be of metal. Insulating components shall be of non-tracking material and of low
14、flammability. b) The materials shall comply with the relevant requirements of BS2G100-1, Clause105, and with Clause16 of this BritishStandard. 3 Dimensions The clearance and creepage distances, and the dimensions and positions of the bayonet slots and of the contact plunger shall be as specified in
15、BS52; other essential dimensions shall be in accordance with Figure 1 or Figure 2 of this BritishStandard. 4 Construction a) The lampholder shall be constructed so that it grips the lamp cap in such a way that there is no relative movement between the dummy lamp cap and the lampholder shell under th
16、e conditions of the vibration test (Clause14). b) Spring contacts shall be arranged so that the terminals do not move when a lamp is inserted. The contact pressures shall be not less than1kg and not more than1.5kg for B15s lamps, and not less than0.75kg and not more than1kg for BA9s lamps. c) For B1
17、5s lampholders the principal current path to the centre contact shall be other than via the spring in the plunger assembly. d) Means shall be provided to prevent the lampholder rotating in its mounting. e) Terminal connections shall accept at least two pre-insulated ring-type crimped tags of No.6 UN
18、C size. 5 Electrical performance The lampholder shall satisfy the requirements of the high voltage, insulation resistance, and contact resistance tests specified in Clauses10, 11 and12. 6 Environmental requirements The lampholder shall comply with the relevant requirements of BS2G100 in respect of m
19、echanical and physical environmental conditions and of freedom from magnetic interference. The grading of the lampholder for vibration, acceleration and climatic performance shall be: Section 2. Tests 7 General Tests shall be made to prove compliance with all the requirements of this BritishStandard
20、. Three kinds of test are specified as follows: Type tests. Clauses8 to16. These shall be made in the order given on representative lampholders of each particular design, as specified in Clause8. Production tests. Clauses17 to19. These shall be made on every lampholder in the order given. Quality te
21、sts. Clauses21 and22. These shall be made on samples as specified in Clause20. Vibration: Grade A. Acceleration: Grade C, Class3A, and crash condition Grade E, Class13. Climatic: Class1.BSG 193:1966 2 BSI 02-2000 A. Type tests 8 General Twelve lampholders shall be tested in accordance with Clauses9
22、to13. Six of the samples shall then be subjected to the vibration and acceleration tests specified in Clauses14 and15 and then to the combined temperature, pressure and humidity tests specified for Class1 equipment in BS2G100. The remaining six lampholders shall be subjected to the tropical exposure
23、 test also specified in BS2G100. 9 Physical check The lampholder shall comply with Clauses2, 3 and4. 10 High voltage test The lampholder shall withstand a test voltage of1000volts r.m.s. applied for one minute between the centre contact and the shell. 11 Insulation resistance test The insulation res
24、istance of the lampholder shall be measured between the centre contact and shell at a potential of500volts d.c. and shall be not less than10 megohms. 12 Contact resistance test With the appropriate dummy lamps shown in Figure 3 inserted, the voltage drop between the lampholder shell and the centre c
25、ontact terminal shall be not more than100millivolts at1amp. 13 Compass interference test The compass safe distance relative to the lampholder shall be measured in accordance with BS2G100 and declared. 14 Vibration test The lampholder shall be subjected to the Grade A vibration tests specified in BS2
26、G100. The appropriate dummy lamp shown in Figure 3 shall be in the lampholder throughout the tests. The contact resistance test (Clause12) shall constitute the functioning test required during the vibration tests. Voltage drop shall be measured at the beginning and end of the tests and at every chan
27、ge of frequency and amplitude. At no time during the functioning tests shall the voltage drop exceed100millivolts at1amp. 15 Acceleration test The lampholder shall be subjected to the Grade C, Class3A acceleration test and to the Grade E, Class13 crash acceleration test specified in BS2G100. The con
28、tact resistance test (Clause12) shall constitute the functioning test required during the acceleration tests. At no time during the functioning tests shall the voltage drop exceed100millivolts at1amp. 16 Climatic test a) The lampholder shall be subjected to cycles of temperature, pressure and humidi
29、ty, and, if necessary to the fungus growth test, specified in the climatic Class1 tests in BS2G100. During the tests the lampholder shall be fitted with the appropriate lamp specified in Table 1. Functioning tests at A, B, C and D in the cycles shall consist of energizing the lamp for at least2 minu
30、tes at28volts. Table 1 b) The lampholder shall be subjected to the tropical exposure test specified in BS2G100. During the test the lampholder shall be fitted with the appropriate lamp specified in Table 1. The lamp shall be energized at the conclusion of the test for at least2 minutes at28volts. c)
31、 After either of the climatic tests specified above, the lamp shall be removed and the following additional tests shall be made on the lampholder: i) Contact resistance test (Clause12) within15minutes of removal from the chamber and after shaking off condensed moisture. ii) Insulation resistance tes
32、t (Clause11) within1“ to2hours of removal from the chamber, the value of insulation resistance being not less than2megohms. Lampholder Lamp Nominal rating BritishStandard lamps reference number (BS G181) B15s BA9s Volts 28.0 28.0 Watts 40 2.8 A(N)101 A.8BSG 193:1966 BSI 02-2000 3 B. Production tests
33、 17 Contact pressure tests The contact pressure shall be determined, using the gauges specified in BS52, modified so that diameter A of the plug part of the gauge is14.8mm for B15 lampholders, and9.0mm for BA9 lampholders. The pressure shall be within the relevant limits specified in Sub-clause4 b).
34、 18 High voltage test The lampholder shall withstand a test voltage of1000volts r.m.s. applied for one minute between the centre contact and the shell. 19 Insulation resistance test The insulation resistance of the lampholder shall be measured between the centre contact and the shell at a potential
35、of500volts d.c. and shall be not less than10 megohms. C. Quality tests 20 Selection of samples From any batch of one type of lampholder put forward for test at one time, ten lampholders shall be taken at random. 21 Inspection The lampholder shall comply with the requirements of Clauses2, 3 and4 rele
36、vant to workmanship, finish and dimensions. 22 Contact resistance test With the appropriate dummy lamp inserted, the voltage drop between the lampholder shell and the centre contact terminal shall be not more than100millivolts at1amp. Care must be taken that the dummy lamp cap pins fully engage with
37、 the bayonet slots in the lampholder. 23 Conditions of compliance The conditions of compliance for Clauses21 and22 taken together shall be as shown in Table 2. A lampholder which fails both clauses shall be regarded as one failure. Table 2 First sample of10 Second sample of10 No failurebatch passes
38、test One failuretest a second sample of10 No failurebatch passes test One failurereject the batchBSG 193:1966 4 BSI 02-2000 Figure 1 Typical B15s lampholder and fixing clip Figure 2 Typical B9s lampholderBSG 193:1966 BSI 02-2000 5 Figure 3 Dummy lampsBS G193:1966 BSI 389 Chiswick High Road London W4
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