SAE-AS-4950B-2007.pdf
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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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AS4950 REV. B AEROSPACE STANDARD Issued 1998-03 Revised 2007-03 Superseding AS4950A (R) Design and Performance Criteria Transport Aircraft Portable Megaphones RATIONALE The purpose of this document is to assure minim
5、um standards of usability and performance for hand-held electronic portable megaphones used aboard transport category aircraft for emergency communications. In the preparation of this document, consideration has been given to the performance of existing equipment as well as the recommendations of ai
6、rcraft operators, and megaphone manufacturers. However, the primary goal of this document is to ensure that future megaphone designs will perform adequately in transport category aircraft emergency situations. 1. SCOPE This SAE Aerospace Standard (AS) provides design criteria and performance tests f
7、or portable, handheld, battery- powered, electronic megaphones used by aircraft crew members to provide information and guidance in the event of an aircraft emergency or other non-routine situation. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the
8、 extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of 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 cited herein, the text of this document tak
9、es precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 RTCA Publications Available from Radio Technical Commission for Aeronautics Inc., 1828 L Street, NW, Suite 805, Washington, DC 20036, Tel: 202-833-9339, w
10、ww.rtca.org. RTCA/DO-160D Environmental Conditions and Test Procedures for Airborne Equipment Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 20:57:08 MSTNo reproduction or networking permitted without license from I
11、HS -,-,- SAE AS4950 Revision B - 2 - 2.2 Related Publications The following publications are provided for informational purposes only and are not a required part of this document. 2.2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606
12、-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. ARP577 Emergency Placarding - Internal and External ARP583 Flight Attendant Stations ARP997 Passenger Cabin Emergency Equipment Stowage 2.2.2 FAA Publications Available from Federal Aviation Administration, 800 Independence Av
13、enue, SW, Washington, DC 20591, Tel: 866-835- 5322, www.faa.gov. Code of Federal Regulations, Title 14, Part 21, Certification Procedures for Products and Parts Code of Federal Regulations, Title 14, Part 25, Airworthiness Standards: Transport Category Airplanes Code of Federal Regulations, Title 14
14、, Part 121, Operating Requirements: Domestic, Flag, and Supplemental Operations AC 121-6 Portable Battery-Powered Megaphones TSO-C137 Aircraft Portable Megaphones 2.3 Definitions 2.3.1 RATED INPUT Rated input shall be determined as follows: The megaphone shall be set up under free field conditions a
15、nd an input applied to the microphone from an acoustically isolated artificial voice, emitting a warble frequency of 1250 to 1750 Hz at a pressure of 10,000,000 micropascals at 0.75 in (1.91 cm) and placed at a distance of 0.06 in (0.15 cm) away from and on the microphone axis. The electrical output
16、 of the microphone measured across a resistance equal to the input impedance shall be considered rated input. 2.3.2 FULL GAIN The full gain is defined as the input/output ratio of the electronic amplifier at rated input that produces maximum megaphone output within the distortion limits allowed. 2.3
17、.3 USABLE GAIN The usable gain is defined as the input/output ratio of the electronic amplifier at rated input with the megaphone volume control (if provided) set as high as possible without feedback. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/59139
18、77001 Not for Resale, 12/04/2007 20:57:08 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4950 Revision B - 3 - 2.4 Mandating and Recommending Words “Shall” - The word “shall” indicates a mandatory criterion. “Should” - The word “should” indicates a criterion for whic
19、h an alternative, including noncompliance, may be applied if it is documented and justified. 3. GENERAL REQUIREMENTS 3.1 Handle Size The grip shape shall allow easy and secure handling of the megaphone with either hand. The grip circumference shall be no more than 6.5 in (16.5 cm) and the grip lengt
20、h shall be no less than 3.5 in (8.9 cm). 3.2 Weight The megaphone shall weigh no more than 6 lb (2.7 kg) including batteries. 3.3 Balance The megaphone shall be balanced to allow easy one-handed operation for 1 hour of continuous use. 3.4 Durability and Reliability The megaphone shall be designed to
21、 meet the following requirements: 3.4.1 All materials used except small parts (knobs, triggers, fasteners, seals, and small electrical parts) that would not contribute significantly to the propagation of a fire shall be self-extinguishing when tested in accordance with applicable requirements of 14
22、CFR 25.853. 3.4.2 The megaphone should comply with Section 5 of this standard. 3.4.3 The megaphone shall be shown to operate continuously at usable gain for a period of at least 4 hours after being completely submerged in seawater for a period of 2 seconds. 3.5 Stowage Provisions The megaphone desig
23、n may include a stowage bracket. If included, the stowage bracket shall meet the following specifications: 3.5.1 The bracket shall be designed to minimize the possibility of inadvertent actuation. 3.5.2 The bracket shall allow the release and removal of the megaphone using only one hand. 3.5.3 The b
24、racket should allow for ease of serviceability checks. 3.5.4 The bracket shall be of a contrasting color to the color of the megaphone. 3.6 Color The majority of the megaphones exterior surface shall be of a bright color (e.g., white, yellow, orange) known to be highly visible in such circumstances
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