1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/ARP5543 AEROSPACE RECOMMENDED PRACTICE ARP5543 Issued 2008-08 Reaffirmed 2015-01
5、Aircraft Wheel Inflation Valves Incorporating an Inflation Pressure Gauge RATIONALE ARP5543 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE This specification covers the recommended design, construction, performance and testing requirements for aircraft wheel inflation v
6、alves incorporating an inflation pressure gauge which are mounted on the aircraft wheel. These valve/gauge assemblies should be appropriate for use on all aircraft types supported by tubeless tire/wheel assemblies. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to th
7、e extent specified herein. The latest issue of SAE publications should apply. The applicable issue of other publications should be the issue in effect on the date of the purchase order. In the event of conflict between the text of the document and references cited herein, the text of this document s
8、hould take precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 7
9、24-776-4970 (outside USA), www.sae.org. AS5202 Port or Fitting End, Internal Straight Thread, Design Standard AS33514 Fitting End, Standard Dimensions for Flareless Tube Connection and Gasket Seal 2.2 ANSI Publications Available from American National Standards Institute, 25 West 43rd Street, New Yo
10、rk, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI/NCSL Z540-1 General Requirements for Calibration Laboratories and Measuring and Test Equipment 2.3 U.S. Government Publications Airworthiness Directive 87-08-09 Nitrogen Inflation Requirements; Available from: www.faa.gov, select “Airworthines
11、s Directives” under Quick Find Federal Specification A-A-59503, Commercial Item Description Nitrogen, Technical MIL-STD-810, Environmental Engineering Considerations and Laboratory Tests RTCA/DO-160, Environmental Conditions and Test Procedures for Airborne Equipment Unless otherwise indicated, copi
12、es of federal and military specifications, standards and handbooks are available from: Acquisition Streamlining and Standardization Information System (ASSIST) database (http:/assist.daps.dla.mil), Standardization Documents Order Desk, 700 Robbins Avenue, Building #4, Section D, Philadelphia, PA 191
13、11-5094. 2.4 Other Industry Standards Tire and Rim Association Standards (Annual Publication) ETRTO (European Tire & Rim Technical Organization Standards) 3. GENERAL REQUIREMENTS 3.1 Intended Use The inflation valve/gauge assembly described in this publication is designed for attachment directly to
14、aircraft wheel assemblies. The inflation valve/gauge assembly is intended to be used to inflate and deflate the tire/wheel assembly and measure the difference between the internal tire pressure and the ambient atmospheric pressure. Valve thread details and installation torques should follow Tire & R
15、im Association Standards. In no case should this product be installed in an overpressure relief valve location. 3.2 Inflation Media The valve/gauge assembly is intended for use with dry gaseous nitrogen, or dry, clean air, where applicable, on braked/unbraked wheels. Nitrogen should conform to Feder
16、al Specification A-A-59503 Commercial Item Description Nitrogen, Technical. 3.3 Valve/Gauge Assembly The mechanical valve/gauge assembly should include a pressure gauge employing a pointer and background pressure graduation marks, a connector for the gauge to be attached to the wheel valve stem, and
17、 an integral inflation/deflation valve which would accept a standard inflation chuck and conforms to the applicable Tire & Rim Association (T&RA) standards. The digital valve/gauge assembly should include a pressure gauge employing a digital display, a connector for the gauge to be attached to the w
18、heel valve stem, and an integral inflation/deflation valve which would accept a standard inflation chuck and conforms to the applicable Tire & Rim Association (T&RA) standards. 3.4 Installation Envelope The installation envelope may be established by the wheel manufacturer or the airframe manufactur
19、er, as appropriate. Installation should be such as to protect the valve/gauge assembly and to make it easy to read. SAE INTERNATIONAL ARP5543 2 OF 123.5 Finishes Paint or other material, including shock-absorbing material, may be applied. The exterior material should, in its final condition, resist
20、all climatic and chemical conditions of its usual environment. Requirements are further defined in the testing section of this specification. 3.6 Weight A maximum weight for the valve/gauge assembly may be established by the wheel manufacturer or the airframe manufacturer, as appropriate. The weight
21、 so specified should include the valve cap, valve core and all seals or gaskets required for installation. 3.7 Mechanical Gauge Pointer and Face Markings 3.7.1 The gauge should be directly readable with no multiplication factors required. 3.7.2 The pointer position, pressure numerals and pressure gr
22、aduation marks should be legible from not less than 2 feet (0.6 m). Adequate contrast should be provided between the markings, pointer and background to permit easy reading of the gauge with a flashlight during hours of darkness. Red color should not be used for either markings or background unless
23、the customer request specifies it. The distance between the pointer and background should not allow the possibility of significant parallax errors. 3.7.3 The mechanical gauge should be designed in a minimum of two different operating ranges. The recommendation for normal operational ranges are 0 to
24、250 psi (0 to 17.2 bar) and 200 to 500 psi (13.8 to 34.5 bar). The 0 to 250 psi (0 to 17.2 bar) range should be marked in 5-psi (0.3 bar) increments, maximum. The 200 to 500 psi (13.8 to 34.5 bar) range should be marked in 10-psi (0.7 bar) increments, maximum. 3.7.4 The pointer tip should overlay th
25、e applicable pressure graduation mark at all pressure readings. The pointer tip should be thinner than the mark thickness, if possible. The pointer should also overlay at least half of the length of the shortest dial mark. 3.7.5 Pressure zones should NOT be color-coded. Changes in recommended tire p
26、ressures over time render color codes ineffective and can be confusing. 3.7.6 The dial face should be mechanically attached to the gauge to prevent movement. 3.7.7 The gauge should continuously display tire inflation pressure, including those times at which inflation or deflation is being performed.
27、 3.7.8 At ambient atmospheric pressure, the gauge pointer should be at the zero marked position within the accuracy requirements listed in 4.2. 3.8 Digital Display 3.8.1 An electronic digital readout may be used in place of the mechanical pointer in 3.6. 3.8.2 A digital display should be legible fro
28、m not less than 2 feet (0.6 m) in direct sunlight, if self illuminating, or with a flashlight during hours of darkness. 3.8.3 The digital display should display in 1 psi increments, maximum. 3.8.4 The batteries which power the digital units should be located in a separate compartment which does not
29、expose other circuitry during battery changes. 3.8.5 A low battery or gauge malfunction indicator should be provided. SAE INTERNATIONAL ARP5543 3 OF 123.8.6 To preserve battery life, a push to read button, or equivalent, may be installed. 3.8.7 Digital measuring equipment should be constructed such
30、that normal ground operation of the aircraft electrical systems should not interfere with proper display and accuracy, nor should the digital measuring system interfere with any active aircraft system. 3.8.8 The wheel or airframe manufacturer should specify if EMC (Electromagnetic Compatibility) is
31、required, and, if so, the specification and levels required as well as proof of compliance and/or qualification. 3.9 Gauge Lens (Crystal or Cover Glass) 3.9.1 The lens of the gauge should be transparent, impact resistant, and scratch resistant and not be affected by extraneous fluids or the operatin
32、g environment including the pressure changes due to altitude. 3.9.2 The lens should be designed to stop the intrusion of dust, dirt, moisture, fluids or other substances which may obscure the gauge face. Hermetic sealing is not recommended. 3.10 Inflation/Deflation Valve/Gauge Assembly Part The part
33、 of the valve/gauge assembly which is used for inflation or deflation should extend above the lens sufficiently to accept standard inflation chucks and should conform to the applicable Tire & Rim Association (T&RA) standards. The part of the valve/gauge assembly which is used for inflation or deflat
34、ion should only be placed off the axis of the unit if it can be demonstrated that a standard tire inflation chuck cannot be attached with the part of the valve/gauge assembly used for inflation or deflation at the most critical position with respect to the wheel. 3.11 Valve Cap The part of the valve
35、/gauge assembly which is used for inflation and deflation should have a valve cap for valve core protection against moisture, contaminants, etc., and will contain the inflation pressure should the core fail. The valve cap used and installation should conform to the applicable Tire and Rim Associatio
36、n (T&RA) standards. 3.12 Valve Core (Used in the Inflation/Deflation Gauge Part) 3.12.1 The desired size of valve core may be specified by the wheel manufacturer or the airframe manufacturer, as appropriate. 3.12.2 The valve core and its installation should conform to Tire and Rim Association (T&RA)
37、 standards. 3.13 Identification Each production valve/gauge assembly should be marked with the manufacturers part number, manufacturers name and/or logo, serial number, date of manufacture, calibration date, and appropriate markings, as applicable. 4. PERFORMANCE 4.1 Pressures 4.1.1 Operational Infl
38、ation Pressure Range Valve/gauge assemblies should be designed for one of two operational inflation pressure ranges, either 0 to 250 psi (0 to 17.2 bar) or 200 to 500 psi (13.8 to 34.5 bar). SAE INTERNATIONAL ARP5543 4 OF 124.1.2 Valve/Gauge Assembly Proof and Burst Pressure 4.1.2.1 Proof Pressure (
39、1.5 times maximum nominal pressure) a. The 0 to 250 psi (0 to 17.2 bar) valve/gauge assembly should remain operational and should not be damaged by a proof pressure of 375 psi (25.9 bar) which is sustained for 5 minutes. b. The 200 to 500 psi (13.8 to 34.5 bar) valve/gauge assembly should remain ope
40、rational and should not be damaged by a proof pressure of 750 psi (51.7 bar) which is sustained for 5 minutes. 4.1.2.2 Burst Pressure (see Pressure Tests of 5.9) a. The 0 to 250 psi (0 to 17.2 bar) valve/gauge assembly pressure sensing parts may deform but should not rupture at a minimum pressure of
41、 575 psi (39.6 bar) which is sustained for 3 minutes. When the valve/gauge assembly is burst tested, the valve/gauge assembly should be taken to failure to establish that a benign failure mode exists if the valve/gauge assembly is accidentally over pressurized. b. The 200 to 500 psi (13.8 to 34.5 ba
42、r) valve/gauge assembly pressure sensing parts may deform but should not rupture at a minimum pressure of 1125 psi (77.6 bar) which is sustained for 3 minutes. When the valve/gauge assembly is burst tested, the valve/gauge assembly should be taken to failure to establish that a benign failure mode e
43、xists if the valve/gauge assembly is accidentally over pressurized. 4.1.3 Ambient (Atmospheric) Pressures The valve/gauge assembly should be designed for ambient pressure range variations corresponding to pressure altitude variations from -2000 to 53 000 feet to cover airports under sea level and ma
44、ximum aircraft operating ceilings. 4.2 Gauge Tolerance The gauge tolerance should not exceed those values for the pressures and temperatures shown in the following tables: 4.2.1 Gauge Inflation Pressure Range - 0 to 250 psi (0 to 17.2 bar) TABLE 1 Temperature Degrees F (C) Gauge Tolerances -58 to 22
45、 (-50 to -5.5) 2% of Reading or 2 psi (0.14 bar), whichever is greater 22 to 122 (-5.5 to 50) 1% of Reading or 1 psi (0.07bar), whichever is greater 122 to 160 (50 to 71) 2% of Reading or 2 psi (0.14 bar), whichever is greater 4.2.2 Gauge Inflation Pressure Range - 200 to 500 psi (13.8 to 34.5 bar)
46、TABLE 2 Temperature Degrees F (C) Gauge Tolerances -58 to 22 (-50 to -5.5) 2% of Reading or 5 psi (0.34 bar), whichever is greater 22 to 122 (-5.5 to 50) 1% of Reading or 2 psi (0.14 bar), whichever is greater 122 to 160 (50 to 71) 2% of Reading or 5 psi (0.34 bar), whichever is greater 4.3 Flow Rat
47、e Test The fill rate/time should be identical or not exceed that of the standard valve stem by more than 3 percent. Deflation rate/time with the valve core removed should be identical or not exceed that of the standard valve stem time by more than 5 percent. SAE INTERNATIONAL ARP5543 5 OF 124.4 Inst
48、allation Position The valve/gauge assembly should be capable of installation on the wheel and capable of operation in any gauge orientation. 4.5 Gauge Response The gauge pointer (mechanical) or display (digital) should instantaneously respond to increases or decreases in operational pressure due to
49、filling, deflating or fluctuations in tire pressure. 4.6 Ambient (Atmospheric) Temperature The valve/gauge assembly should be designed to be exposed to ambient temperature from -65 F (-54 C) to 250 F (107 C) and function in ambient temperatures from -58 F (-50 C) to 160 F (71 C). 4.7 Extraneous Fluids/Contaminants/Ozone/Ultraviolet Light Valve/gauge assembly operational performance and external surfaces, including the
