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 2016 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/AS8025A AEROSPACE STANDARD AS8025 REV. A Issued 1988-02 Revised 1999-01Reaffirmed
5、 2016-06 Passenger Oxygen Mask RATIONALE AS8025A has been reaffirmed to comply with the SAE five-year review policy. FOREWORDChanges in this revision are format/editorial only.1. SCOPE:This standard covers oronasal type masks which use a continuous flow oxygen supply. Each such mask comprises a face
6、piece with valves as required, a mask suspension device, a reservoir, or rebreather bag (when used), a length of tubing for connection to the oxygen supply source, and a means for allowing the crew to determine if oxygen is being delivered to the mask. The assembly shall be capable of being stowed s
7、uitably to meet the requirements of its intended use.1.1 Purpose:This standard establishes the minimum requirements for the design, construction and performance of continuous flow oxygen masks for passenger cabin occupants in civil commercial aircraft.1.2 Presentation:When presented, the mask assemb
8、lys application shall be obvious. The mask shall be capable of quick and easy donning regardless of any special orientation requirements.SAE INTERNATIONAL AS8025A Page 2 of 30 1.3 Coding of Performance Classification:An eight-digit performance classification number shall be assigned to each class of
9、 masks. This number shall correspond to the number assigned to the minimum performance curve established in 6.1.7.2.2 and shall represent the required minimum oxygen flow rates (NTPD) to the mask shown on curve “C” of Figure 1 at cabin pressure altitudes of 15 000, 25 000, 30 000 ft and the maximum
10、approved altitude, respectively. Flow rates shall be to one decimal.Typical Example - AS 8025-08233248-YY*-XX*0.8 - required minimum oxygen flow, L/min, NTPD, at 15 000 ft2.3 - required minimum oxygen flow, L/min, NTPD, at 25 000 ft3.2 - required minimum oxygen flow, L/min, NTPD, at 30 000 ft4.8 - r
11、equired minimum oxygen flow, L/min, NTPD, at maximum approved altitude*YY - Maximum approved altitude in thousands of feet*XX - Additional coding which the mask manufacturer may desire to add1.4 Interchangeability of Mask Assemblies:1.4.1 Same Coding: Masks with the same coding shall be interchangea
12、ble.1.4.2 Different Performance Classification Numbers (remainder of coding the same): Only those masks whose performance classification number shows that at all certified cabin altitudes, the required oxygen flow rates are equal to or less than the flow rates supplied to the mask from the airplane
13、system shall be used on that airplane.2. APPLICABLE DOCUMENTS:2.1 Completely Applicable:The following specifications, drawings, and publications of the issue in effect on the date of initiation of qualification tests, shall form a part of this specification:MIL-P-7105 Pipe Threads, Taper, Aeronautic
14、al National Form, Symbol ANPTMIL-S-8879 Screw Threads, Controlled Radius Root with Increased Minor DiameterMIL-O-27210 Oxygen 99.5%, Gas and Liquidor AS8010BB-N-411 Nitrogen, Liquid and GasSAE INTERNATIONAL AS8025A Page 3 of 30 2.1 (Continued):MIL-STD-889 Metals - Definition of DissimilarFederal Sta
15、ndard ColorsNo. 5952.2 Partially Applicable:The following specifications, drawings, and publications of the issue in effect on the date of initiation of qualification tests shall form a part of this specification to the extent noted in this document:AS916 Standard for Oxygen Flow IndicatorsAIR1082 F
16、luid System Component Specification CriteriaA.T.A 100 Specification for Manufacturers Technical DataFAR PART 25 Federal Aviation Regulations Covering Airworthiness Standards for Transport Category AirplanesMIL-STD-810 Environmental Testing, Aeronautical and Associated Equipment, General Specificatio
17、nTSO-C64 Oxygen Mask Assembly, Continuous Flow, Passenger (For Air Carrier Aircraft)3. GENERAL REQUIREMENTS:3.1 Product:The article furnished under this specification shall be capable of meeting the requirements specified herein.3.2 Deviations:Where the requirements of this specification differ from
18、 requirements of the specifications, drawings, and publications listed, the requirements of this specification shall govern.SAE INTERNATIONAL AS8025A Page 4 of 30 3.3 Materials:3.3.1 General: Materials shall be of type, grade, and quality, which experience or test or both have demonstrated to be sui
19、table for the purpose intended. Materials which contaminate oxygen or are affected adversely by continuous service with oxygen shall not be used.Materials shall have at least flame-resistant properties as specified in Federal Aviation Regulation Part 25.853.3.3.2 Facepiece: The facepiece shall be fr
20、ee of objectionable odors. Materials in contact with the skin shall be selected to be non-allergenic and non-irritating.3.3.3 Cleaning and Sterilizing: The mask shall be made of materials which permit cleaning and sterilization without adverse effects and without disassembly. The manufacturer shall
21、recommend the method of cleaning and sterilizing.3.3.4 Elastomer Components: All elastomer materials used in the mask shall have been manufactured not more than 12 months prior to the delivery date of the mask except those materials that a longer period has proven feasible. A tag or leaflet describi
22、ng elastomeric components with service life limits and a suggested method for inspection and detection of deterioration in these components, which may adversely affect the performance of the mask, shall be attached to or included in the packaged mask prior to delivery to the user.3.3.5 Fungus (Inert
23、): Components shall be fungus proofed by selection to the greatest extent practicable of parts and materials that are non-nutrient to fungus, or by treatment of the parts and materials prior to their use. Treatment shall be non-allergenic and non-irritating with no objectionable odors and shall be c
24、onsistent with the other material requirements in 3.3.3.3.6 Dissimilar Metals: Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other (Reference MS33586).3.3.7 Material Specification: The material specification of all parts o
25、f this mask assembly shall be submitted for approval to the procuring activity if requested.3.4 Workmanship:The mask shall be fabricated and finished in accordance with the highest grade practice in the manufacture of this type equipment. The finished mask and all internal parts shall be cleaned thr
26、oughout and be free of flashing, burrs, scale, and oils, or any other conditions or materials that might adversely affect the safe operation of the mask. All components shall be resistant to snags, breaks, tears, and other harmful actions which could lead to malfunction of the mask due to rough hand
27、ling during its service life.SAE INTERNATIONAL AS8025A Page 5 of 30 3.5 Finish:All materials that are not inherently corrosion-resistant shall be finished with a protective treatment or coating to minimize the effect of exposure to the environmental conditions that may be encountered in the service
28、for which the equipment is intended. The protective treatment or coating shall not chip, flake, or powder, or otherwise contaminate the mask.3.6 Color:The color of the facepiece shall be No. 13538 yellow of Federal Standard No. 595.3.7 Interchangeability:All parts having the same manufacturers part
29、number shall be directly and completely interchangeable with each other with respect to installation, performance and operation.3.8 Deterioration:Corrosion or deterioration, such as oozing of plasticizers, of any component that could in any manner make the mask unsuitable for use and prevent the mas
30、k from meeting operational requirements during its service life shall be cause for rejection of the mask.3.9 Service Life:The service life of the article after delivery to the using agency shall be not less than three years when normal storage and use conditions are observed. This includes subjectin
31、g the mask assembly to cleaning and sterilization treatments (see 5.4). At the end of and during the service life specified or established, or both, by the mask manufacturer, the mask assembly shall be operationally serviceable and capable of meeting the appropriate requirements specified herein. If
32、 the mask is deemed disposable by the mask manufacturer, its service life may be considered complete after the first normal use. Shelf life shall be considered separately and will be over and above service life. Shelf life shall be specified.3.10 Reliability:Reliable operation shall be a major consi
33、deration, even after long periods of inattention during stowage on the shelf or in the aircraft, or both.SAE INTERNATIONAL AS8025A Page 6 of 30 3.11 Identification Markings:The following information shall be marked on the outside of the article using materials or processes, or both, that shall ensur
34、e legibility during the expected life span of the article. The marking shall not cause smudging or discoloration of the article.a. The words “Oxygen Mask”b. Manufacturers Part Numberc. Manufacturers Name and Addressd. Performance Classification Number (see 1.3)e. Elastomer Cure Date (see 3.3.4)f. Pi
35、cture (see 5.11)g. Date of Manufactureh. TSO Number (If Applicable)4. DETAIL CONSTRUCTION REQUIREMENTS:4.1 Facepiece Assembly:4.1.1 Fit: The facepiece shall be of a sufficient resilience, size and shape to conform readily to extreme facial contours using no more pressure than supplied by the mask su
36、spension device. The facepiece shall cover the airways of the nose and mouth. The main body of the mask shall be stiff enough to minimize deformation due to incorrect handling, which might result in reduction in operating performance.4.1.2 Volume: The chamber formed between the face and the mask sha
37、ll at all times be of a minimum volume.4.1.3 Valve Design: Valves, where used, shall be designed to offer minimum resistance to inflow of oxygen and ambient air during inhalation, and to outflow of expiration gases during exhalation.4.1.4 Provision for Attachment of Actuation Cord for Turning on Oxy
38、gen Supply: Provision shall be made where applicable for the attachment of a ribbon or a lanyard to the mask to turn on the oxygen supply. This lanyard and its attachment provision must be capable of withstanding a pull of 44.48 N (10 lbf) in any direction.SAE INTERNATIONAL AS8025A Page 7 of 30 4.2
39、Mask Suspension (Holding) Device:A simple mask suspension device shall be provided for holding the mask on the users face during normal head movements. The attachment of the suspension device shall not restrict the orientation of the mask. The device shall have such dimensions and elastic properties
40、 that it can hold the mask to the face without adjustment and at the same time it shall present minimum discomfort to the wearer. A simple means for adjusting the tightness of the mask shall be provided.The adjustment means shall be easily identifiable to the user by a visual or tactile recognition,
41、 such as tabs at the ends of elastic suspension straps.The suspension device shall be stowed on the facepiece in a manner that shall not interfere with normal operation of the mask, with hand-held usage, or with automatic presentation of the mask assembly.4.3 Gas Bag (Where Used):The gas bag, where
42、used, shall be attached to the facepiece and tubing with sufficient strength to withstand a pull force in any direction of 22.24 N (5 lbf) for at least three seconds and shall be made of flexible material which will collapse when not in use. The gas bag(s) shall have the following minimum and maximu
43、m capacity when inflated to 0.125 kPa (0.5 inches of water) positive pressure.4.4 Tubing:The oxygen supply tube, which is to be used for connecting the mask assembly to the oxygen supply source, shall be light in weight, and shall be capable of being bent to a 12.7 mm (0.5 inch) radius measured to t
44、he center line of the tube for stowage purposes with less than a 5% restriction to flow during subsequent use. The tubing shall be fully flexible within a temperature range of -29 C(-20 F) to 71 C (160 F). For installations requiring tight radii, “anti-kink” devices are recommended.TABLE 1Type Minim
45、um Volume (cm3) Maximum Volume (cm3)Reservoir 1000 1500Rebreather 800 1000SAE INTERNATIONAL AS8025A Page 8 of 30 4.5 Flow Indication:4.5.1 There must be a means to allow the crew to determine whether oxygen is being delivered to each oxygen mask assembly.4.5.2 Flow indication must comply with AS916
46、as applicable.5. PERFORMANCE REQUIREMENTS:Unless otherwise specified, all flow requirements refer to oxygen.5.1 Environmental Conditions:5.1.1 Stowage Configuration: The mask assembly including the supply tubing shall be capable of being stowed in such a manner as to be ready for its intended use. T
47、he mask shall remain serviceable in its stowed configuration until it is required for its specific application. The maximum stowage envelope shall be defined by the manufacturer in coordination with the buyer. Where the mask is to be automatically presented by a drop method, compliance shall be demo
48、nstrated by showing that the mask falls freely from an inverted rigid box with envelope dimensions representing the intended installation.5.1.2 Temperature and Humidity: The assembly shall be capable of being stowed at temperatures of 71 C (160 F) for 120 hours at relative humidities varying from 5
49、- 95% and at -57 C (-70 F) for two hours, without adversely affecting subsequent performance after return to room temperature.5.1.3 Condensation: Operation of the equipment shall not be adversely affected by moisture accumulated during use.5.1.4 Vibration: In its stowed configuration, the equipment shall be capable of withstanding vibrations as follows:5.1.4.1 Resonance: One million cycles or eight hours, whichever occur
