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 ther
2、efrom, 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
3、publication 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: +1 724-776-49
4、70 (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:/standards.sae.org/ARP5021A AEROSPACE RECOMMENDED PRACTICE ARP5021 REV. A Issued 1999-12 Revised 2011-06 Reaffirm
5、ed 2016-11 Superseding ARP5021 Oxygen Cylinder Installation Guide RATIONALE ARP5021A has been reaffirmed to comply with the SAE five-year review policy. TABLE OF CONTENTS 1.SCOPE 2 2.REFERENCES 2 2.1Applicable Documents 22.1.1SAE Publications . 22.1.2Other Publications . 22.2Definitions . 3 3.REQUIR
6、EMENTS . 3 3.1Compatibility with Aircraft Environment 33.1.1Pre-Design Analysis 33.1.2Design Verification 33.2Design Objectives and Installation Precautions . 43.2.1Airworthiness Requirements . 43.2.2Design Objectives . 43.2.3Installation Precautions . 53.3Testing 53.4Maintenance and Servicing . 53.
7、4.1Refilling Cylinders . 53.4.2Hydrostatic Testing . 63.4.3Cylinder Inspection . 63.4.4Leakage Testing 63.5Transportation and Handling . 6 4.QUALITY ASSURANCE . 7 5.NOTES 7 1. SCOPE This document provides guidance for oxygen cylinder installation on commercial aircraft based on rules and methods pra
8、cticed in aerospace industry and applicable in other associations. It covers considerations for oxygen systems from beginning of project phase up to production, maintenance, and servicing.The document is focused on requirements regarding DOT approved oxygen cylinders. However, its basic rules may al
9、so be applicable to new development pertaining to use of such equipment in an oxygen environment. For information regarding oxygen cylinders itself, reference should be made to AIR825/12 also. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the exten
10、t 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 takes pre
11、cedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970
12、(outside USA), www.sae.org.AIR825/12 Oxygen System Integration and Performance Precautions AIR825/13 Guide for Evaluating Combustion Hazards in Aircraft Oxygen Systems AIR5742 Packaging and Transportation of Oxygen Equipment AS1046 Minimum Standard for Portable Gaseous, Oxygen Equipment AIR1059 Tran
13、sfilling and Maintenance of Oxygen Cylinders AS1219 Aircraft Oxygen Replenishment Coupling for Civil Transport Aircraft (Design Standard) AS8010 Aviators Breathing Oxygen Purity Standard 2.1.2 Other Publications ISO 9001 Quality systems - Model for quality assurance in design/development, production
14、, installation and servicing Federal Specification RR-C-901C, which identifies Oxygen Cleaning requirements FAA Order 8000.40C - Maintenance of Pressure Cylinders in Use as Aircraft Equipment Compressed Gas Association Publications CGA C-1, C-6, C-6.2 and C-6.8, CGA-540, CGA-577, CGA-701 European In
15、dustrial Gases Association (EIGA) External Prefill Inspection for Composite Cylinders, IGC 131/05/E MIL-PRF-27210, “Oxygen, Aviators Breathing, Liquid and Gas” GENERAL COMMENT: The DOT specifications are contained in the Code of Federal Regulations, Transportation, 49 within Parts 100 to 199 and any
16、 Special Permit granted for example by the Department of Transportation (DOT) for composite cylinders _SAE INTERNATIONAL ARP5021A 1 of 62.2 Definitions COMPOSITE CYLINDER: Pressure vessel consisting of a gas tight metal (e.g., aluminum) container reinforced by filament material as fiberglass , kevla
17、r, carbon, or hybrid fibers. HYDROSTATIC TEST: Periodic pressure test within the life of the component to verify its serviceability. OXYGEN CYLINDER: Pressure vessel to store breathing gas (oxygen) under high pressure. Such equipment is available in various sizes and designed according to DOT specif
18、ications. 3. REQUIREMENTS 3.1 Compatibility with Aircraft Environment 3.1.1 Pre-Design Analysis Prior to the design of oxygen cylinder installation an analysis should be made to determine that the installation will be compatible with conditions on the aircraft during operation, servicing and mainten
19、ance. During oxygen system definition one of the most important issues influencing the overall system architecture is the location of the oxygen source in an aircraft. System availability and aircraft safety are dependent to a high degree on careful selection of oxygen cylinder location. The purpose
20、 of the analysis shall be to show that potential hazards are minimized to the aircraft and its occupants which could result from the installation, of the system or system failure effects. Prior to system design the oxygen cylinder installation should be evaluated by a hazard, particular risk and or
21、zonal analysis, covering repercussions of: a. Uncontained engine burst b. Compatibility with surrounding systems (e.g., electrical power, hydraulics, fuel, hot air, etc.) c. Cylinder burst should not lead to a Hazardous or Catastrophic Effect d. Consequences of oxygen leakage, in particular that the
22、 installation area is sufficiently ventilated to ensure the oxygen concentration will not exceed 25%. NOTE: The importance of area ventilation is to ensure that oxygen concentration greater than 25% will not be exceeded due to cylinder leakage. e. Structural damage during crash landing f. Flight loa
23、ds g. Vibration and acceleration h. Removal and reinstallation of oxygen cylinders 3.1.2 Design Verification Subsequent to the design of oxygen cylinder installation a review should be made to confirm that assumptions and targets established as a result of the pre design analysis have been considere
24、d and can be accomplished. _SAE INTERNATIONAL ARP5021A 2 of 63.2 Design Objectives and Installation Precautions 3.2.1 Airworthiness Requirements The design for oxygen cylinder installation including fixation in the aircraft should comply with FAR/CS Airworthiness Requirements of FAA/EASA, mainly: a.
25、 25.561 Emergency Landing Conditions b. 25.601 Design and Construction (General) c. 25.603 Design and Construction (Material) d. 25.611 Design and Construction (Accessibility Provisions) e. 25.869 Fire Protection Systems f. 25.899 Electrical Bonding and Protection Against Lightning and Static Electr
26、icity g. 25.903 Engines (Turbine Engine Installation) h. 25.1301 Equipment (Function and Installation) i. 25.1309 Equipment (Equipment System and Installation) j. 25.1441 Oxygen Equipment and Supply k. 25.1453 Protection of Oxygen Equipment from Rupture l. 23.1451 Fire Protection for Oxygen Equipmen
27、t (applicable to aircraft certified as per FAR/CS 23 Requirements) 3.2.2 Design Objectives Design objectives as stated in the following will be applicable to current DOT type steel and composite cylinders. With regards to development of new pressure vessel technology, based on different materials, t
28、he objectives may be completed and advanced testing methods may also be taken into account. 3.2.2.1 Oxygen cylinder(s), associated lines and equipment shall be protected against high temperatures and shall not be installed in designated fire zones. 3.2.2.2 The support(s) of the oxygen cylinder(s) sh
29、all be designed to withstand the flight, landing and crash loads. 3.2.2.3 The installed oxygen cylinder(s) and associated equipment shall not be ruptured by deformation of the fuselage in case of landing with retracted nose landing gear. 3.2.2.4 Orientation of the oxygen cylinder(s) shall be such, t
30、hat the pressure gauge is readable without removing the cylinder(s) from attachments and connections to lines. 3.2.2.5 Sufficient ventilation of the installation area should be ensured in case of leakage (Reference AIR825/13). 3.2.2.6 Maintenance on other systems should not necessitate the removal o
31、f oxygen cylinders, their supports or associated components. 3.2.2.7 Access to oxygen cylinder(s) for checks, maintenance and removal/reinstallation should not require disassembling of other systems. _SAE INTERNATIONAL ARP5021A 3 of 63.2.3 Installation Precautions The installation on the aircraft sh
32、ould ensure that precautions have been realized as following: a. Proximity to combustibles, moving aircraft parts and electrical wiring/equipment shall comply with requirements of AIR825/12 and AIR825/13. b. Unambiguous information (e.g., placards) shall be provided regarding the location of the equ
33、ipment, handling, accessibility and a caution that oxygen equipment needs particular attention. 3.3 Testing Leakage testing and function checks related to equipment, interconnection lines, and oxygen cylinder(s) should be performed at intervals required by the maintenance program for the aircraft ty
34、pe. The Department of Transportation (DOT) specifies hydrostatic test requirements and service life limitations for the various types of cylinders used in aircraft oxygen systems. The date of manufacture and hydrostatic test dates are stamped on the shoulder of steel cylinders. The date of manufactu
35、re is included on the cylinder label of composite cylinders; subsequent hydrostatic test dates are shown on retest labels which are attached to the composite overwrap. The not to be exceeded hydrostatic test dates are: a. A maximum of five years for steel (3AA) cylinders, refer to CGA pamphlet C-6 b
36、. A maximum of three years for steel (3HT) or five years for composite cylinders FRP TYPE FC (e.g., SP-8162), also refer to CGA pamphlet C-6.8. c. As per DOT exemption. Cylinders may not be refilled or topped off unless they have a current hydrotest.Steel cylinders (3AA) have an unlimited service li
37、fe, provided they pass the periodic hydrotest. Steel (3HT) cylinders have a 24 year service life or 4380 pressurizations and composite cylinders FRP TYPE FC (e.g., E-8162) have a 15 year service life, provided they pass the periodic hydrotest and / or comply with appropriate DOT exemption. If a cyli
38、nder is to be removed for maintenance but not tested, it should not be vented completely. Some residual pressure, approximately 0.2 MPa (29 psi), shall remain, so that the cylinder will not be contaminated. NOTE: Other types of cylinders may have different hydrostatic tests and service lives, refer
39、also to CGA pamphlet C-6.2. 3.4 Maintenance and Servicing 3.4.1 Refilling Cylinders The cylinders may be filled or recharged by adding oxygen to the cylinder when installed on the aircraft (transfilling) or the cylinder may be removed for remote recharging and reinstallation into the aircraft. 3.4.1
40、.1 On-Aircraft Transfilling: The cylinders will be refilled as per the aircraft manufacturers procedures and AIR1059. Oxygen cylinders should only be serviced with oxygen per AS8010 or MIL-PRF-27210 and consideration should be given to the use of an inline filter to prevent metal particle ingestion.
41、 3.4.1.1.1 Transfilling Equipment: Systems designed for transfilling shall have external access to the filling port. The filling port shall conform to AS1046, AS1219 or CGA Connection No. 540. For each cylinder, there shall be a contents indicator or gage that shows the pressure or contents during r
42、efilling. Adequate protection shall be provided to prevent damage or contamination to the fill port before, during, and after transfilling. _SAE INTERNATIONAL ARP5021A 4 of 63.4.1.2 Off-Aircraft Refilling: Cylinder refilling shall be performed by trained personnel following aircraft manufacturers pr
43、ocedures or other industry standard procedures. Recommendations contained in AIR1059 should be taken into account. 3.4.1.2.1 Removing and Reinstalling Cylinders: Cylinder removal and reinstallation shall be performed as specified by the aircraft manufacturers procedures. The procedures shall be safe
44、 and uncomplicated. Where practical, quick release or disconnect brackets can be used to allow efficient removal and reinstallation. When the cylinder has been removed, provisions shall be taken to cover the open fittings of the cylinder and the aircraft connectors to protect them from damage and co
45、ntamination until reinstallation of the cylinder. NOTE: Before reinstalling the cylinder the right torque value for the brackets, depending on fill pressure, shall be determined.WARNING: Use of Teflon tape at cylinder pneumatic interface is prohibited as its use in this area could pose a serious fir
46、e hazard. 3.4.2 Hydrostatic Testing DOT cylinders having periodic testing requirements shall be removed and tested in accordance with the retest period required for the cylinder type. Note that cylinders which have reached their service life limits shall be removed and destroyed per applicable proce
47、dures to ensure that they may not be reused unknowingly as oxygen pressure vessels. CGA C-2 contains recommendations for disposition of unserviceable cylinders. 3.4.3 Cylinder Inspection Composite cylinder or other designs that might be damaged by handling or aircraft operational activities should be inspected per applicable procedures if damage is evident or suspected. Procedures as per FAA AC 43.13-13 or EIGA IGC 131/05/E and according to CGA pamphlets C-6, C-6.2 and C-6.8 may be applied. 3.4.4 Leakage Testing The cylinder, pressurized components, and pneumatic air
