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1、BRITISH STANDARD BS 2G 113: 1956 Specification for Manifold pressure gauges for aircraft UDC 629.13.056.32 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956 This British Standard, having been approved by the Aircraft Industry St
2、andards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 29 March 1956 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/30 Draft for commen
3、t CV(ACE)7162 ISBN 0 580 34129 1 Foreword This revised standard has been prepared to provide an up-to-date specification for aircraft manifold pressure gauges in the light of experience gained in the application of the requirements of the first edition of BS G 113, published in 1949, which it supers
4、edes. Information has been added relating to the incidence of testing, and recommendations included in respect of tests to verify the serviceability of the instruments. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsib
5、le 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, pages i and ii, pages 1 to 4 and a back cover. This standard has been updated (see copyright
6、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.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956
7、BSI 01-2000i Contents Page ForewordInside front cover 1Scope1 2Definitions1 Section 1. General requirements 3Preferred size1 4Preferred units of measurement1 5General construction1 Section 2. Particular requirements 6Construction1 Section 3. Tests 7General2 8Ranging test2 9Position test2 10Temperatu
8、re test2 11Overload test2 12Leakage test2 13Altitude test2 14Vibration test2 15Acceleration test2 16Climatic tests3 17Routine production tests3 Appendix A Serviceability tests4 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank License
9、d Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956 BSI 01-20001 1 Scope This British Standard specifies the design requirements, performance and test procedure for manifold pressure gauges for aircraft. It is primarily applicable to mec
10、hanical instruments operated directly by the manifold pressure. The accuracy requirements are, however, applicable irrespective of the operating principle. 2 Definitions For the purposes of this British Standard the following definitions shall apply: manifold pressure gauge an instrument used on air
11、craft to indicate the absolute pressure in the induction pipe of the engine. This instrument was formerly referred to as a “boost gauge” standard ground pressure the standard ground pressure is defined as 1013.25 millibars (I.C.A.O.1) standard atmosphere) or 29.921 inches of mercury under BS 25202)
12、conditions, i.e. mercury at 0 C, g = 980.665 dyn/cm2 Section 1. General requirements 3 Preferred size The preferred size is that of aircraft instrument case Type 1 or Type 2, as specified in BS G 100, “General requirements for electrical equipment and indicating instruments for aircraft.” 4 Preferre
13、d units of measurement The preferred units of measurement are: a) Pounds per square inch for instruments in which a standard ground pressure is marked as zero. b) Inches of mercury (BS 2520 conditions) for instruments graduated in absolute pressure. 5 General construction The instrument shall be sou
14、nd and suitable for its purpose and shall comply with the relevant requirements of BS G 100. Section 2. Particular requirements 6 Construction a) The movement of directly operated instruments shall be of the type in which manifold pressure is not applied directly to the interior of the case. b) A fi
15、ne metallic gauze filter shall be incorporated in the union connection for the purpose of preventing dirt from entering the instrument. The filter shall be securely retained in position by a positive device which will, at the same time, permit the filter to be removed easily for cleaning. c) A suita
16、ble constriction shall be provided in the inlet union on the instrument side of the filter to prevent the possibility of the instrument being damaged by engine backfires. d) The union connection shall be securely locked in position in such a manner as to withstand a torque of 100 in. lb, applied in
17、either direction, when the instrument is mounted on a suitable plate and held by fixing bolts. e) If an adjustable lubber mark is fitted, the means of adjustment shall be such that it can be locked against inadvertent or irresponsible operation. f) The movement shall be provided with a safety device
18、 to prevent damage to the mechanism under a low pressure overload of 12 lb/sq. in. below standard atmospheric pressure. The movement shall also withstand a pressure overload of 50 per cent of its positive range, i.e. the scale range above standard atmospheric pressure. g) The movement shall be provi
19、ded with stops so that when the instrument is subjected to the overloads specified in f), the pointer comes to rest in each direction in the gap between the ends of the scale. h) The pressure scale shall be evenly divided, that is the angular movement of the pointer shall be approximately the same f
20、or equal intervals of pressure taken anywhere over the scale. If a single pointer is used for the presentation, the scale length shall not be such that the pointer makes more than one revolution. 1) International Civil Aviation Organization. 2) BS 2520, “Barometer conventions and tables.” Licensed C
21、opy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956 2 BSI 01-2000 Section 3. Tests 7 General a) Tests shall be made to prove compliance with all the requirements of this British Standard. It is not intended or recommended that complete test
22、s shall be made on every instrument supplied. Two kinds of test therefore are specified as follows: Type tests. (Clauses 8 to 16), which shall be made in that order on the same instrument, on representative samples of each particular design and range of instrument. Routine production tests. (Clause
23、17), which shall be made on every instrument manufactured in accordance with the British Standard. b) The minimum tests recommended to verify the serviceability of instruments manufactured in compliance with this British Standard are indicated in Appendix A. TYPE TESTS 8 Ranging test The accuracy sp
24、ecified is for room temperature (1520 C) with the instrument in the normal position with the dial upright and in a vertical plane, irrespective of whether the pressure is increasing or decreasing. For the purpose of checking the accuracy, the standard atmospheric pressure or equivalent graduation sh
25、all be taken as zero. At this point the accuracy shall be within 0.1 lb/sq. in. (0.2 in. of mercury), or 1 per cent of the larger pressure range from the datum zero, whichever is the greater. At all other points on the scale the accuracy shall be within 0.2 lb/sq. in. (0.4 in. of mercury), or 2 per
26、cent of indication counted from the datum zero, whichever is the greater. 9 Position test The change in reading from the normal shall not exceed 0.05 lb/sq. in., or 0.1 in. of mercury when the instrument is tilted in any direction within 90 from the normal position of use. 10 Temperature test At tem
27、peratures of 20 C and + 50 C the tolerances shall not exceed those quoted in Clause 8 by more than 50 per cent. 11 Overload test The instrument shall not be deranged by subjection to the overload pressures specified in Clause 6 f), the operation of the stops shall be in accordance with Clause 6 g),
28、and the errors shall subsequently not exceed those specified in Clause 8. 12 Leakage test There shall be no leakage from the instrument, as judged by fall in pressure shown by the pointer, when a given pressure equal to two-thirds of the full positive scale reading is applied and then shut off. If t
29、he instrument is intended for use in pressure cabin aircraft and there is any likelihood of the case being normally sealed, the instrument shall withstand an external positive pressure of 12 lb/sq. in. above that of the interior, without failure. 13 Altitude test The permissible errors specified in
30、Clause 8 shall not be exceeded when the instrument is tested under an external pressure of 7 in. of mercury (approximately equivalent to 35,000 ft. I.C.A.O.). During the test the instrument shall be arranged so that the interior of the case is exposed to the reduced pressure, e.g. the cover glass sh
31、all be removed. 14 Vibration test The instrument shall show no errors, outside the tolerance specified in Clause 8, when subjected to the varying frequency vibration tests relevant to its installation position in the aircraft, laid down in BS G 100, and any pointer oscillation shall be within the li
32、mits permitted therein. The instrument shall also withstand any appropriate endurance vibration test laid down in the same standard without damage or derangement. 15 Acceleration test The instrument shall be subjected to the grade of acceleration test specified in BS G 100 appropriate to the perform
33、ance grading declared by the manufacturer. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956 BSI 01-20003 16 Climatic tests The instrument shall be subjected to the climatic tests specified in BS G 100 appropriate to the perform
34、ance grading declared by the manufacturer. For the purpose of these tests the inlet union of the instrument shall be connected in the appropriate manner to a pipe led outside the test chamber and left open to atmosphere. The instrument shall subsequently comply with the requirements of the tests for
35、 ranging and leakage in Clauses 8 and 12. 17 Routine production tests (As defined in Clause 7) Each instrument shall comply with the requirements of the tests specified in the following clauses of this British Standard: Clause 8Ranging test. 9Position test. 11Overload test. 12Leakage test. 13Altitud
36、e test. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 113:1956 4 BSI 01-2000 Appendix A Serviceability tests The minimum tests recommended to verify the serviceability of instruments manufactured in compliance with the British Standa
37、rd are as follows: a) Ranging test (Clause 8). b) Leakage test (Clause 12). Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2
38、G 113: 1956 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Briti
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