《SAE-ARP-1322A-1998-R2007.pdf》由会员分享，可在线阅读，更多相关《SAE-ARP-1322A-1998-R2007.pdf（10页珍藏版）》请在三一文库上搜索。
1、AEROSPACE RECOMMENDED PRACTICE ARP1322 REV. A Issued1975-01 Revised1998-05 Reaffirmed2007-08 Superseding ARP1322 Overpressurization Release Devices FOREWORD Changes in this revision are format/editorial only. 1.SCOPE: This SAE Aerospace Recommended Practice (ARP) specifies the minimum design and tes
2、t recommendations for aircraft tubeless tire and wheel overpressurization release devices to protect from possible explosive failure of the contained air chamber due to overinflation. This device will not protect against flash fire explosive conditions within the air chamber which may occur due to e
3、xtremely overheated brakes. To protect against this condition, nitrogen or other inert gas should be used for inflation. 1.1Purpose: This document recommends minimum requirements for aircraft tubeless tire and wheel overpressurization release devices. 1.2Classification: Overpressurization Release De
4、vices shall be furnished in a range of sizes to accommodate the sizes and inflation pressure requirements of tubeless tires and wheels used on aircraft. 2.APPLICABLE DOCUMENTS: The following publications form a part of this document to the extent specified herein. The latest issue of SAE publication
5、s 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 precedence. Nothing in this document, however, supersedes
6、applicable laws and regulations unless a specific exemption has been obtained. 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 suitab
7、ility for any particular use, including any patent infringement arising therefrom, 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. Copyri
8、ght 2007 SAE International All rights reserved. No part of this 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 ORD
9、ER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org RATIONALE This document has been reaffirmed to comply with the SAE 5-Year Review policy. Copyright SAE International Provided by IHS under
10、license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:54:02 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 2 - 2.1U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbi
11、ns Avenue, Philadelphia, PA 19111-5094. MS33649 MIL-S-8879 MIL-STD-838 3.GENERAL REQUIREMENTS: 3.1Materials: Materials used in the construction of the devices shall be suitable for the purpose intended. All metals shall be corrosion resistant unless suitably plated or treated to resist corrosion dur
12、ing stocking and normal service life use. The use of dissimilar metals, especially brass, copper, or steel in contact with aluminum, magnesium, or alloys thereof, shall be avoided where practicable. Where the use of dissimilar metals cannot be avoided, they shall be insulated from contact with each
13、other. 3.2Workmanship: Workmanship and finish shall be in accordance with highgrade aircraft accessory manufacturing practice and be free of defects which affect proper functioning in service. 3.3Identification: The Overpressurization Release Device shall be plainly marked as follows: a.Assembly No.
14、 b.Manufacturers Name c.Nominal Release Pressure Devices too small to carry the complete identification on the part shall be suitably tagged or stored in suitable sealed containers which have been clearly marked. The device shall carry as a minimum the manufacturers assembly number and the nominal r
15、elease pressure in .06 inch (1.5 mm) metal stamped or etched characters. 4.PERFORMANCE REQUIREMENTS: 4.1General: The Overpressurization Release Device shall be designed to release pressure from the tubeless tire at one of the nominal release pressures listed in Table 1. To the maximum extent practic
16、able all such devices shall be designed to preclude the inadvertent installation of any unit having a different Nominal Release Pressure than the one intended. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:54:02
17、 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 3 - 4.2Release Device: The Overpressurization Release Device mounted in the wheel may be furnished as either a part of the inflation valve or as a separate unit. 4.2.1Each device shall release at its
18、rated nominal release pressure within 15%. If the device is the reseatable type, it shall reseat at more than 100 psig (689 kPa), except in the case of devices set at 200 psig (1379 kPa) or less, which shall reseat at more than 50 psig (344 kPa). If the device is neither the bypass nor reseatable ty
19、pe, but similar to the blowout plug type, it must be capable of letting the excessive pressure out of the tire at a greater rate than can be forced into the tire through the inflation valve with the core removed, using a 3000 psi (20,700 kPa) unlimited supply source. 4.2.2Deflation shall be accompli
20、shed with no malfunction from the formation of ice crystals during pressure reduction. 4.2.3Leakage or bleeding shall not occur due to pressure buildup when tire is bottomed or heated to maximum operating temperature. 4.3Operating Medium: The unit shall function as specified herein when used with ei
21、ther air, nitrogen (N2), or other inert gas with any content of water vapor from zero to saturation at the operating temperatures and pressures. 4.4Contamination Acceptance: The unit shall not malfunction due to normal contamination of the inflation media. 4.5Operating Environment: The unit shall fu
22、nction as specified herein when subjected to ambient temperatures from -65 to 150 F (-54 to 65.5 C) and ambient pressure altitudes from -1000 feet (-305 m) to +15,000 feet (+4580 m). The unit shall not leak or show other evidence of malfunction as a result of exposure to temperatures up to 250 F (12
23、1 C) or pressure altitudes to 80,000 feet (24,400 m). 5.DESIGN AND CONSTRUCTION: 5.1Interface: The Overpressurization Release Device shall be designed as a complete assembly to fit a threaded boss in accordance with MS33649 machined in the wheel. Table 1 lists the boss thread size to be used with th
24、e specified nominal release pressure and the associated normal tire inflation pressure range if the device is part of the inflation valve. If the device is the blowout plug type, it shall be sized in accordance with meeting the requirements of 4.2.1. Copyright SAE International Provided by IHS under
25、 license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:54:02 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 4 - 5.2Lubrication: The Overpressurization Release Device shall conform to MIL-STD-838 for any lubrication ne
26、cessary. 5.3Sealing: All components of the Overpressurization Release Device shall be sealed against dust, dirt, moisture, and water insofar as is practical. 5.4Installation: Location of the device in the wheel shall be in a protected area to prevent damage during wheel assembly and during service.
27、The device should be replaceable without removing the tire from the wheel. In the event the release pressure is reached, then flying particles from the device must not be hazardous to personnel. TABLE 1 Operating Tire Pressure Psig Operating Tire Pressure kPa Nominal Release Pressure Psig Nominal Re
28、lease Pressure kPa Boss Thread Per MIL-S-8879 80-129 552-8892001379.5625-18-UNJF-3B 130-199 896-13723102137.5000-20-UNJF-3B 200-2841379-19584603172.4375-20-UNJF-3B 285-3991965-27516404413.3750-24-UNJF-3B 400-5792758-39929306412.3125-24-UNJF-3B Copyright SAE International Provided by IHS under licens
29、e with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:54:02 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 5 - 6.QUALIFICATION TESTS: Individual units in each Nominal Release Pressure setting may be used to perform the foll
30、owing tests. However, in order to reduce the number of test units required, it is recommended test specimens be subjected to qualification tests performed in the order shown. a.Bypass or Reseatable Type: (3 specimens required) 1.Test Unit No. 1 6.5 Mud Test 6.2.1 Pressure Release Function 6.3 High T
31、emperature Test 6.2.1 Pressure Release Function 6.4 Low Temperature and Icing Test 6.2.1 Pressure Release Function 6.6 Pressure Endurance Test 2.Test Unit No. 2 6.9 Shock Test 6.10 Vibration Test 6.2.1 Pressure Release Function 6.1 Pressure Impulse Cycling 6.2.1 Pressure Release Function 3.Test Unit
32、 No. 3 6.7 Dynamometer Test 6.8 In-Flight Braking Test 6.2.1 Pressure Release Function b.Blowout Plug Type: (5 specimens required) 1.Test Unit No. 1 6.6 Pressure Endurance Test 6.5 Mud Test 6.2.2 Pressure Release Function 2.Test Unit No. 2 6.3 High Temperature Test 6.2.2 Pressure Release Function Co
33、pyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:54:02 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 6 - 6. (Continued): 3.Test Unit No. 3 6.4 Low Temperature and
34、Icing Test 6.2.2 Pressure Release Function 4.Test Unit No. 4 6.7 Dynamometer Test 6.8 In-Flight Braking Test 6.2.2 Pressure Release Function 5.Test Unit No. 5 6.9 Shock Test 6.10 Vibration Test 6.1 Pressure Impulse Cycling 6.2.2 Pressure Release Function c.Inflation Valve Type: (3 specimens required
35、) 1.Test Unit No. 1 6.5 Mud Test 6.2.3 Pressure Release Function 6.3 High Temperature Test 6.2.3 Pressure Release Function 6.4 Low Temperature and Icing Test 6.2.3 Pressure Release Function 6.6 Pressure Endurance Test 2.Test Unit No. 2 6.9 Shock Test 6.10 Vibration Test 6.2.3 Pressure Release Functi
36、on 6.1 Pressure Impulse Cycling 6.2.3 Pressure Release Function 3.Test Unit No. 3 6.7 Dynamometer Test 6.8 In-Flight Braking Test 6.2.3 Pressure Release Function 6.11 Proof Test 6.12 Burst Test Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 N
37、ot for Resale, 12/04/2007 18:54:02 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE ARP1322 Revision A - 7 - 6.1Pressure Impulse Cycling: The test unit shall be installed in a suitable manifold to represent a wheel and tire. The manifold pressure shall be cycled from a l
38、ow pressure of 5 psig (34.5 kPa) maximum to a maximum pressure at least equal to 75 percent of the Nominal Release Pressure for the unit. During each cycle, the pressure shall be increased from the minimum to the maximum value in no more than 2 seconds. The maximum pressure shall be sustained for at
39、 least 3 seconds and then released. The test shall be continued for a minimum of 25 cycles without leakage from the unit as evidenced by a bubble test. Bubble test means to indicate leakage by use of soap solution or other bubble forming liquid. If the unit is the blow out plug or rupture diaphragm
40、type, the test shall be continued for a minimum of 5000 cycles without leakage. 6.2Pressure Release Function: The unit shall be subjected to one of the following tests appropriate for the particular type of unit. 6.2.1Bypass or Reseatable Type: The test unit shall be installed in a suitable manifold
41、 to represent a wheel and tire. The pressure at the inlet connection to the manifold shall be rapidly increased to at least 120 percent of the Nominal Release Pressure for the unit and inlet shall be shut off. The unit shall begin to release the manifold pressure at the Nominal Release Pressure with
42、in plus or minus 15 percent, and shall reseat and retain at least 100 psig (689 kPa) pressure in the manifold. (Units rated for 200 psig (1379 kPa) shall reseat and retain at least 50 psig (344 kPa) in the manifold.) Within 10 seconds of reseating, the unit shall exhibit no leakage in the following
43、minute as evidenced by a bubble test. This test shall be repeated for a total of at least 5 cycles. 6.2.2Blow Plug Type: The test unit shall be installed in a suitable manifold to represent a wheel and tire. The manifold shall be pressurized by means of a standard tire inflation valve. Pressure appl
44、ied at the inflation valve shall be at least 2000 psig (13,790 kPa) throughout the test. The device shall release manifold pressure at the Nominal Release Pressure plus or minus 15 percent. With 2000 psig (13,790 kPa) minimum pressure maintained at the inflation valve, the manifold pressure shall no
45、t increase above the pressure at which release occurred during 3 seconds following release. 6.2.3Inflation Valve Type: The test unit shall be installed in a suitable manifold having a total volume of approximately 750 inch3 (0.0123 m3) to represent a wheel and tire. Pressure at the inflation port of
46、 the test unit shall be rapidly increased to at least 2000 psig (13,790 kPa) and maintained at this value until the manifold pressure, as measured by a recorder, has been stabilized for at least 3 seconds, at which time the inflation port shall be blocked. The device shall release at a manifold pres
47、sure equal to the Nominal Release Pressure plus or minus 15 percent. During the cycle, the manifold pressure shall not exceed 115 percent of the Nominal Release Pressure. After the inflation port is blocked, the device shall reseat and retain at least 100 psig (689 kPa) pressure in the manifold. (Un
48、its rated for 200 psig (1379 kPa) shall reseat and retain at least 50 psig (344 kPa) in the manifold.) Within 10 seconds of reseating the unit shall exhibit no leakage in the following one minute as evidenced by a bubble test. This test shall be repeated for a total of at least 5 cycles. If leakage should occur due to failure of the valve core, it is permissible to eliminate the leakage by installation of the valve cap or other mechanical means. Copyright SAE International Provided by IHS under license with SAELicensee=Defense