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 theref
2、rom, 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 2012 SAE International All rights reserved. No part of this pub
3、lication 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: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS23899AAEROSPACESTANDARDAS23899 REV. A Issued 1999-05 Stabilized 2012-01Superseding
5、 AS23899 Aural Protector, Sound FSC 4240 RATIONALEThis document has been determined to contain basic and stable technology which is not dynamic in nature. NOTICEThis document has been taken directly from U.S. Military Specification MIL-A-23899B(AS) and contains only minor editorial and format change
6、s required to bring it into conformance with the publishing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-A-23899B(AS). Any part numbers established by the original specification remain unchanged. The original Military Specification was adop
7、ted as an SAE standard under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and stand
8、ards without consensus voting at the SAE Committee level, and (b) the use of the existing government specification or standard format. Under Department of Defense policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Any requ
9、irement relating to qualified products lists (QPLs) has not been adopted by SAE and is not part of this SAE technical document. 1. SCOPE 1.1 Scope This specification covers the design and performance requirements for one type of sound aural protector. 2. APPLICABLE DOCUMENTS The following publicatio
10、ns form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of the other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references c
11、ited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitte
12、d without license from IHS-,-,-SAE AS23899A Page 2 of 23 2.1 Government Documents 2.1.1 Specifications and standards: Unless otherwise specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) s
13、pecified in the solicitation, form a part of this specification to the extent specified herein. SPECIFICATIONSFEDERALL-P-375 Plastic Film, Flexible, Vinyl Chloride L-P-1183 Plastic Molding Material, Acrylonitrile-Butadiene-Styrene (ABS), Rigid QQ-C-320 Chromium Plating (Electrodeposited) QQ-N-290 Ni
14、ckle Plating (Electrodeposited) PPP-B-566 Boxes, Folding, Paperboard PPP-B-601 Boxes, Wood, Cleated Plywood PPP-B-621 Box, Wood, Nailed and Lock-Corner PPP-B-636 Box, Shipping, Fiberboard PPP-B-676 Boxes, Setup MILITARYMIL-H-6875 Heat Treatment of Steel (Aircraft Practice), Process for MIL-B-7883 Br
15、azing of Steels, Copper, Copper Alloys, Nickel Alloys, Aluminum and Aluminum Alloys MIL-S-7947 Steel, Sheet and Strip (1095), Aircraft Quality MIL-P-26514 Polyurathane Foam, Rigid or Flexible, for Packaging STANDARDSFEDERALFED-STD-595 Colors MILITARYMIL-STD-105 Sampling Procedures and Tables for Ins
16、pection by Attributes MIL-STD-129 Marking for Shipment and Storage MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-794 Parts and Equipment, Procedures for Packaging of MIL-STD-889 Dissimilar Metals MS15795 Washer, Flat Metal, Round, General Purpose (In/mm) Copyright SAE Internat
17、ional Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS23899A Page 3 of 23 MS16633 Ring, Retaining, External, “E”, (Reduced Section Type) MS21083 Nut, Self Locking, Hexagon, Non-Metallic, Insert, Low Height, 250 F (Copies
18、of specifications, standards, drawings and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other Publications The following documents form a part of this specific
19、ation to the extent specified herein. The issue of the document which is indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. 2.3 American Standards Association (ASA) Publications Available from Commander, Naval Air Development Center (C
20、ode 6031), Warminster, PA 18974. ASA Z24.22-1957 American Standard Method for the Measurement of the Real-Ear Attenuation of Ear Protectors at Threshold.2.4 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585,
21、 www.astm.org.ASTM A29-81 Steel Bars, Carbon and Alloy, Hot Wrought and Cold-Finished, General Requirements for 2.5 Order of Precedence In the event of a conflict between the text of this specification and the references specified herein, the text of this specification shall take precedence. 3. REQU
22、IREMENTS 3.1 Qualification The sound aural protector furnished under this specification shall be a product which is qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.3 and 6.3). 3.2 Materials Materials shall conform to applicable specification
23、s as specified herein. Materials which are not covered by applicable specifications or which are not specifically described herein and on applicable drawings, shall be of the best quality, lightest practicable weight and suitable for the purpose intended. 3.2.1 Metal parts: All metal parts shall be
24、of a corrosion resistant material or treated in a manner to render them adequately resistant to corrosion. 3.2.1.1 Dissimilar metals: Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in MI
25、L-STD-889. 3.2.2 Protective treatment: When materials are used in the construction of the sound aural protector that are subject to deterioration when exposed to environmental conditions likely to occur during service usage, they shall be protected against such corrosion in a manner that will in no
26、way prevent compliance with the performance requirements of this specification. Protective coating that will chip or scale during normal service life or under extremes of environmental conditions shall not be used. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo re
27、production or networking permitted without license from IHS-,-,-SAE AS23899A Page 4 of 23 3.2.3 Fungus-proof materials: Materials which are nutrients for fungi shall not be used where it is practicable to avoid them. Where used and not hermetically sealed, they shall be treated with a fungicidal age
28、nt acceptable to the acquiring activity. However, if they will be used in a hermetically sealed enclosure, fungicidal treatment will not be necessary. 3.2.4 Standard parts: MS and AN standard parts shall be used where they suit the purpose. 3.3 Design and Construction The sound aural protector shall
29、 be designed to meet all the requirements and tests specified herein and shall conform to figures 1 through 14. 3.4 Performance 3.4.1 Sound attenuation: The sound attenuation of the aural protector shall be as specified in Table 1 when measured as specified in 4.5.2. 3.5 Finish Protective coating an
30、d finishes which will crack, chip or scale during normal service life or because of atmospheric conditions shall not be used. 3.6 Workmanship The sound aural protector shall be uniform in quality and shall be free from irregularities or defects which could adversely affect safety, performance, relia
31、bility or durability. 3.7 Marking The sound aural protector shall be marked in accordance with MIL-STD-130. The marking shall be applied once on the headpad support. The nomenclature of the marking shall be as follows: AURAL PROTECTOR, SOUND MIL-A-23899B(AS)Contract number Manufacturers name 4. QUAL
32、ITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements specified herein. Except as otherwise specified, the contractor may use his own or any other facil
33、ities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services con
34、form to prescribed requirements. 4.2 Classification of Inspections The examination and testing of the sound aural protectors shall be classified as follows: a. Qualification inspection. Qualification inspection consists of examinations and tests performed on samples submitted for approval as qualifi
35、ed products (see 3.1, 4.3 and 6.3). b. Quality conformance inspection. Quality conformance inspection consists of examinations and tests performed on individual products or lots to determine conformance of the product or lots with the requirements set forth in this specification (see 4.4). Copyright
36、 SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS23899A Page 5 of 23 4.3 Qualification Inspection Qualification inspection shall consist of all the tests and examinations listed in this specification. 4.
37、3.1 Qualification samples: Qualification samples shall consist of three complete sound aural protectors for which qualification is required. Samples shall be forwarded to a test facility set forth in the letter of authorization to submit samples (see 6.3). The samples shall be plainly identified by
38、securely attached durable tags marked with the following information: Samples submitted by (name) (date) for qualification inspection in accordance with the requirements of MIL-A-23899B(AS) and number under authorization (reference authorizing letter and number) (see 6.3). 4.3.2 Retention: The reten
39、tion of qualification shall consist of periodic verification to determine compliance of the qualified sound aural protectors with the requirements of this specification. The time and method of periodic verification shall be specified by the activity responsible for the qualified products list and sh
40、all be included in the Notice of Qualification letter. 4.4 Quality Conformance Inspection The sampling and inspection levels and acceptance criteria shall conform to MIL-STD-105. Quality conformance inspection shall consist of the following: Visual examination Dimensional examination 4.4.1 Sampling
41、4.4.1.1 Inspection Lot 4.4.1.1.1 Sound aural protector: An inspection lot size shall be expressed in units of sound aural protectors, made under essentially the same conditions and from the same materials and components. The sample unit shall be one sound aural protector. 4.4.1.1.2 Packaging: An ins
42、pection lot size shall be expressed in units of one fully prepared shipping container, containing complete sound aural protector fully prepared for delivery and made from essentially the same materials and components. The sample unit shall be one fully prepared shipping container, containing sound a
43、ural protectors fully prepared for delivery, with the exception that it need not be sealed. 4.4.1.2 Sampling for tests and examinations of the sound aural protectors: The sample size, acceptance criteria, tests and examinations required for the sound aural protectors shall be as specified in Table 2
44、. 4.5 Inspection Methods 4.5.1 Visual Examination 4.5.1.1 Sound aural protector: Each sound aural protector shall be examined visually to determine conformance to this specification. The classification of defects, table III, shall be used to classify the defects found. 4.5.1.2 Dimension: Each sound
45、aural protector selected as a sample unit from the lot shall be thoroughly checked dimensionally to determine conformance to this specification. 4.5.1.3 Packaging: Each of the fully prepared shipping containers, containing sound aural protectors, selected as a sample unit from the lot, shall be visu
46、ally examined to determine the packaging, packing and marking conform to this specification. The classification of defects, Table 4, shall be used to classify the defects found. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted wi
47、thout license from IHS-,-,-SAE AS23899A Page 6 of 23 4.5.2 Sound attenuation: The attenuation of the sound aural protector shall be measured in accordance with ASA Z24.22-1957. Attenuation will be tested at all test frequencies listed in Table 1. The grand mean and standard deviation at each test fr
48、equency shall be reported to the nearest 0.1 decibel. The sound aural protector shall pass the requirements specified in 3.4.1. 5. PACKAGING 5.1 Preservation Preservation shall be level A or C as specified (see 6.2.1c). Other than as specified in 5.1.1, no preservation shall be required.5.1.1 Level
49、A: The sound aural protectors shall be packaged individually in accordance with MIL-STD-794 utilizing a container conforming to PPP-B-566 or PPP-B-676. 5.1.2 Level C: The sound aural protectors shall be packaged to afford the minimum degree of protection necessary to prevent damage during shipment u
