1、BRITISH STANDARD BS 2G 113: 1956 Specification for Manifold pressure gauges for aircraft UDC 629.13.056.32BS2G113:1956 This British Standard, having been approved by the AircraftIndustry Standards Committeeand endorsed by theChairman of the EngineeringDivisional Council,was published undertheauthori
2、ty of the GeneralCouncil of the Institutionon 29 March 1956 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/30 Draft for comment CV(ACE)7162 ISBN 0 580 34129 1 Foreword This revised standard has been prepared to provide an up-to-date specificatio
3、n for aircraft manifold pressure gauges in the light of experience gained in the application of the requirements of the first edition of BSG113, published in1949, which it supersedes. Information has been added relating to the incidence of testing, and recommendations included in respect of tests to
4、 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 responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligat
5、ions. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4 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. Am
6、endments issued since publication Amd. No. Date CommentsBS2G113:1956 BSI 01-2000 i Contents Page Foreword Inside front cover 1 Scope 1 2 Definitions 1 Section 1. General requirements 3 Preferred size 1 4 Preferred units of measurement 1 5 General construction 1 Section 2. Particular requirements 6 C
7、onstruction 1 Section 3. Tests 7 General 2 8 Ranging test 2 9 Position test 2 10 Temperature test 2 11 Overload test 2 12 Leakage test 2 13 Altitude test 2 14 Vibration test 2 15 Acceleration test 2 16 Climatic tests 3 17 Routine production tests 3 Appendix A Serviceability tests 4ii blankBS2G113:19
8、56 BSI 01-2000 1 1 Scope This British Standard specifies the design requirements, performance and test procedure for manifold pressure gauges for aircraft. It is primarily applicable to mechanical instruments operated directly by the manifold pressure. The accuracy requirements are, however, applica
9、ble 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 aircraft to indicate the absolute pressure in the induction pipe of the engine. This instrument was formerly refer
10、red to as a “boost gauge” standard ground pressure the standard ground pressure is defined as1013.25millibars (I.C.A.O. 1)standard atmosphere) or29.921inches of mercury under BS2520 2)conditions, i.e.mercury at0 C, g=980.665dyn/cm 2 Section 1. General requirements 3 Preferred size The preferred size
11、 is that of aircraft instrument case Type1 or Type2, as specified in BSG100, “General requirements for electrical equipment and indicating instruments for aircraft.” 4 Preferred units of measurement The preferred units of measurement are: a) Pounds per square inch for instruments in which a standard
12、 ground pressure is marked as zero. b) Inches of mercury (BS2520 conditions) for instruments graduated in absolute pressure. 5 General construction The instrument shall be sound and suitable for its purpose and shall comply with the relevant requirements of BSG100. Section 2. Particular requirements
13、 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 fine metallic gauze filter shall be incorporated in the union connection for the purpose of preventing dirt from entering the ins
14、trument. 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 suitable constriction shall be provided in the inlet union on the instrument side of the filter to prevent the possibility of the in
15、strument being damaged by engine backfires. d) The union connection shall be securely locked in position in such a manner as to withstand a torque of100in.lb, applied in either direction, when the instrument is mounted on a suitable plate and held by fixing bolts. e) If an adjustable lubber mark is
16、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 to prevent damage to the mechanism under a low pressure overload of12lb/sq.in. below standard atmospheric pressure. The movement
17、shall also withstand a pressure overload of50percent of its positive range, i.e.the scale range above standard atmospheric pressure. g) The movement shall be provided with stops so that when the instrument is subjected to the overloads specified inf), the pointer comes to rest in each direction in t
18、he 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 for equal intervals of pressure taken anywhere over the scale. If a single pointer is used for the presentation, the scale length shall not
19、 be such that the pointer makes more than one revolution. 1) International Civil Aviation Organization. 2) BS2520, “Barometer conventions and tables.”BS2G113:1956 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. I
20、t is not intended or recommended that complete tests shall be made on every instrument supplied. Two kinds of test therefore are specified as follows: Type tests. (Clauses8 to16), which shall be made in that order on the same instrument, on representative samples of each particular design and range
21、of instrument. Routine production tests. (Clause17), which shall be made on every instrument manufactured in accordance with the BritishStandard. b) The minimum tests recommended to verify the serviceability of instruments manufactured in compliance with this British Standard are indicated inAppendi
22、x A. TYPE TESTS 8 Ranging test The accuracy specified 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 at
23、mospheric pressure or equivalent graduation shall be taken as zero. At this point the accuracy shall be within0.1lb/sq.in. (0.2in. of mercury), or1per 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 within0.2lb/s
24、q.in. (0.4in. of mercury), or2percent of indication counted from the datum zero, whichever is the greater. 9 Position test The change in reading from the normal shall not exceed0.05lb/sq.in., or0.1in. of mercury when the instrument is tilted in any direction within90 from the normal position of use.
25、 10 Temperature test At temperatures of 20 C and+50 C the tolerances shall not exceed those quoted in Clause8 by more than50percent. 11 Overload test The instrument shall not be deranged by subjection to the overload pressures specified in Clause6 f), the operation of the stops shall be in accordanc
26、e with Clause6 g), and the errors shall subsequently not exceed those specified in Clause8. 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 t
27、hen shut off. If the 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 of12lb/sq.in. above that of the interior, without failure. 13 Altitude test The permissible error
28、s specified in Clause8 shall not be exceeded when the instrument is tested under an external pressure of7in. of mercury (approximately equivalent to35,000ft. 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
29、 glass shall be removed. 14 Vibration test The instrument shall show no errors, outside the tolerance specified in Clause8, when subjected to the varying frequency vibration tests relevant to its installation position in the aircraft, laid down in BSG100, and any pointer oscillation shall be within
30、the limits 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 BSG100 appropriate to the per
31、formance grading declared by the manufacturer.BS2G113:1956 BSI 01-2000 3 16 Climatic tests The instrument shall be subjected to the climatic tests specified in BSG100 appropriate to the performance grading declared by the manufacturer. For the purpose of these tests the inlet union of the instrument
32、 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 ranging and leakage in Clauses8 and12. 17 Routine production tests (As defined in Clause7) Each instrument
33、 shall comply with the requirements of the tests specified in the following clauses of this British Standard: Clause 8 Ranging test. 9 Position test. 11 Overload test. 12 Leakage test. 13 Altitude test.BS2G113:1956 4 BSI 01-2000 Appendix A Serviceability tests The minimum tests recommended to verify
34、 the serviceability of instruments manufactured in compliance with the British Standard are as follows: a) Ranging test (Clause8). b) Leakage test (Clause12).blankBS 2G113: 1956 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible f
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