1、 INCH-POUNDMIL-PRF-5041K 20 February 2007 SUPERSEDING MIL-PRF-5041J 30 April 1998 PERFORMANCE SPECIFICATION TIRES, RIBBED TREAD, PNEUMATIC, AIRCRAFT Comments, suggestions, or questions on this document should be addressed to 984 CSUG/GBCL, 6040 Gum Lane, Bldg 1216, Hill AFB, UT 84056-5825 or CSUG.GB
2、CL.WorkflowHILL.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database http:/assist.daps.dla.mil.AMSC: N/A FSC: 2620 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
3、-,-MIL-PRF-5041K 1. SCOPE 1.1 Scope. This specification covers requirements for aircraft pneumatic tube type and tubeless ribbed tread tires intended for use on aircraft wheels. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are cited in Section 3 and 4 of this specificati
4、on. These lists do not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of these lists, document users are cautioned that they must meet the requirements specified in
5、the document cited in Sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents.2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise
6、specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE MS SHEETS See Table I for the list of associated MS sheets. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch or http:/assist.daps.dla.mil or from th
7、e Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless
8、 otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL AVIATION ADMINISTRATION PUBLICATION TSO-C62 Technical Standard Order Aircraft Tires (Copies of this document is available from the Federal Aviation Administration, 800 Independence Ave, SW, W
9、ashington DC 20591 or www.faa.gov/regulation_policies/.) 2.2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. SOCIETY OF AUTOM
10、OTIVE ENGINEERS INTERNATIONAL (SAE) SAE AS4833 Aircraft New Tire Standard Bias and Radial 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5041K (Copies of this document is available from www.sae.org or from the Society of Automotive Enginee
11、rs International, 400 Commonwealth Drive, Warrendale, PA 15096-1001.) AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQC Z1.4 Sampling Procedures a ply count indicator shows the maximum number of fabric layers to the outermost structural ply that may be exposed before the tire must be removed from service
12、. Tires for the Department of Navy use shall not incorporate a MWL indicator. 3.5.7 Retreadability. Unless otherwise specified, tires shall have a retread buff line (RBL) visible in the cross sectional cut. 3.5.8 Burst pressure. The tire shall be designed to withstand a minimum burst pressure as spe
13、cified in Table I. If the tire is not listed in Table I, the tire shall be designed to withstand the minimum of 100 cycles of taxi, takeoff, and landing. In addition, for the Department of Navy aircraft with carrier-based requirements, tires shall withstand normal catapults, landing arrestments, and
14、 cable strikes without failure. 3.5.9 Dynamic durability. Unless otherwise specified, excluding wear, tire for fighter, attack, and trainer aircraft shall withstand a minimum of 50 cycles of taxi, takeoff, and landing; tires for other aircraft shall withstand a minimum of 100 cycles of taxi, takeoff
15、, and landing. In addition, the Department of Navy aircraft with carrier-based requirements, tires shall withstand normal catapults, landing arrestments, and cable strikes without failure. 3.5.9.1 Cord fraying. During the dynamic life of the tire, as defined in paragraph 3.5.9; cord fraying, if pres
16、ent in the groove of the tire, shall be only of the outer layer or cord. 3.5.9.2 Tread chunking. During the dynamic life of the tire, as defined in paragraph 3.5.9, and tread chunk shall not exceed one square inch in area or 75 percent of the skid there shall be no more than 3 chunks, each to one in
17、ch in area; and there shall be no more than 10 chunks totaling more than four square inches in area. 3.5.9.3 Groove cracking rubber and fabric tread tires. During the dynamic life of the tire, as defined in paragraph 3.5.9, there shall be no groove cracking in tires having 5 Provided by IHSNot for R
18、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5041K all rubber tread. In tires with fabric tread, any void in the bottom of the groove shall be no deeper than a void caused by the outer layer of cord being pulled through the rubber stock in bottom of the groove. T
19、here shall be no rib undercutting. 3.5.9.4 Bead separation. During dynamic life of the tire, as defined in paragraph 3.5.9, the walls of the bead bundle shall not show evidence of separating from the carcass plies. If bead wires are used, individual wires shall not show evidence of separating for ea
20、ch other or of being kinked, broken, or exposed. 3.5.9.5 Cable bruise (carrier based tires only). A tire to be used on carrier based aircraft shall withstand the minimum cable bruise load specified in Table I without pressure loss. 3.5.10 Wheel/tire slippage. A mounted tire inflated to rated inflati
21、on pressure shall not slip on the rim to such an extent that would damage the tube or valve in a tube type tire or the inflation seal of a tubeless tire. 3.5.11 Inflation pressure retention tubeless tire. After an initial twelve hour growth starting at rated inflation pressure, the pressure loss fro
22、m rated inflation pressure in a tubeless tire assembly during the subsequent 24 hour period shall not exceed five percent of rated inflation pressure specified in Table I. 3.5.12 Balance. Tires shall be balanced, when not inflated, within tolerances specified in Table I. Out-of-tolerance conditions
23、may be corrected by utilizing balance pads affixed to the inside of the tire. In tube type tires, the pads shall not chafe the tubes. Balance pad adhesion values shall be as follows: 8 pound force per inch width minimum for tubeless tires and 1.5 pounds force per inch width minimum for tube type tir
24、es. 3.6 Product identification and marking. Unless otherwise specified, the following information, as applicable, and as further identified in the paragraphs below, shall be marked legibly and permanently on the tire sidewall for the life of the casing. Markings on the tire sidewall shall be located
25、 so that they will not be removed during buffing for re-treading. a. Date of manufacture and serial number. b. Manufacturers name or trademark, or both, to be located by the manufacturer. c. Color dots for vent holes, if used. d. The MWL marking shall be either “MWL-RC” for tires with a colored indi
26、cator or “MWL-#” for tires with a ply count indicator to be shown in a separate molded box (See Figure 1). Tires for the Department of Navy use shall not incorporate a MWL marking. e. Size. f. Tube Type (if applicable). g. Ply Rating (PR is permissible). 6 Provided by IHSNot for ResaleNo reproductio
27、n or networking permitted without license from IHS-,-,-MIL-PRF-5041K h. Cut limit dimension (See Figure 1). i. National Stock Number (NSN). j. Manufacturers qualification test (QTR) number, prefixed by “QTR.” k. Tires with fabric tread shall be marked: FABRIC TREAD. l. Country of manufacture (if oth
28、er than USA). m. Manufacturers mold number. n. Additional markings as required by Table I. 3.6.1 Date of manufacture and serial number. The date of manufacture of the tire shall be included in the serial number of the tire. The serial number shall consist of a maximum of 10 digits. The first five di
29、gits shall be the date of manufacture in the form of a Julian date. He remaining digits, not to exceed five, selected by the manufacturer, may be numbers, letters, or a combination thereof. 3.6.2 Maximum wear limit identification. For tires with an outside diameter greater than 26 inches, the MWL ma
30、rking shall be molded in a minimum of two places equally spaced on each sidewall of the tire. For tires with an outside diameter less than or equal to 26 inches, the MWL marking shall be molded once on each sidewall, 180 degrees from the cut limit marking, as shown in Figure 1. Tires for the Departm
31、ent of Navy use shall not incorporate a MWL marking. 3.6.3 Cut-limit dimension identification. For tires with an outside diameter greater than 26 inches, the cut-limit dimension identification shall be molded in a minimum of two places equally spaced on each sidewall of the tire. For tires with an o
32、utside diameter less than or equal to 26 inches, the cut-limit dimension identification shall be molded once on each sidewall, 180 degrees from the cut-limit marking on the opposite sidewall, as shown in Figure 1. 3.6.4 National Stock Number (NSN. The NSN shall be molded on one side of the tire, on
33、the same side as the serial number. The prefix NSN shall be included. The NSN shall not contain dashes or spaces (Example: 2620XXXXXXXXX). 3.7 Interchangeability. All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. 3.8 Age. The tire shall not
34、be more than 36 months old from the date of manufacture to the initial date of delivery. 4. VERIFICATION 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: a. Qualification inspection, see paragraph 4.2. 7 Provided by IHSNot for ResaleNo reprodu
35、ction or networking permitted without license from IHS-,-,-MIL-PRF-5041K b. Conformance inspection, see paragraph 4.3. 4.2 Qualification inspection. Qualification inspection shall be performed on tires when qualification is required. This inspection shall include all the tests listed in paragraph 4.
36、6. The qualification test samples shall consist of at least one tire of each construction, size, and type. The samples shall be identified and marked as specified in paragraph 3.6. A waiver of the marking requirements on tires supplied for qualification tests may be granted when agreed to between th
37、e procuring activity and the contractor. 4.3 Conformance inspection. Conformance inspection shall include the individual tests of paragraph 4.3.1 and sample tests of paragraph 4.3.2. 4.3.1 Individual tests. Each tire shall be subject to the following tests: a. Examination of product (paragraph 4.6.1
38、. b. Balance (paragraph 4.6.2). 4.3.2 Sample tests. Unless otherwise specified, tires shall be sampled in accordance with ANSI/ASQC Z1.4 at an initial inspection level or normal and the following tests shall be performed: a. Tire dimensions, weight, and rim interface (paragraph 4.6.3). b. Balance pa
39、d adhesion (paragraph 4.6.4). c. Inflation pressure retention for tubeless tires (paragraph 4.6.8). d. Burst pressure (paragraph 4.6.9). 4.4 Test conditions. Unless otherwise specified in the individual test description, all tests shall be conducted at ambient temperature and pressure as specified i
40、n applicable paragraphs below. 4.5 Requirement cross-reference matrix. Table III provides a cross-reference matrix of the Section 3 requirements tested or verified in the paragraphs below. 4.6 Test. 4.6.1 Examination of product test. The tire and associated documentation shall be examined to determi
41、ne compliance with size, material, dimensions, weight, bead width, tread pattern, sidewall, venting, identification, interchangeability, and age requirements. 4.6.2 Balance test. The tire shall be balance checked to determine that the moment required to static balance the tire does not exceed the li
42、mits specified in Table I. 4.6.3 Tire dimensions, weight, and rim interface test. The tires shall be mounted on its rim, inflated to rated inflation pressure specified in Table I, allowed to stand for 12 hours minimum at room temperature, and then re-adjusted to rated inflation pressure. The tire di
43、mensions and weight shall then be determined and compared to the values in Table I or in the TRA Aircraft Yearbook. Tire weight may be measured un-mounted 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5041K 4.6.4 Balance pad adhesion test
44、. Balance pad adhesion shall be tested in accordance with ASTM D413, to determine compliance with the requirements specified in paragraph 3.5.12. 4.6.5 Bead seating pressure test. Without the use of lubricant on either the bead or rim, the pressure at which the tire bead in initially and properly se
45、ated against the wheel flange shall be measured. This pressure shall be within the range specified in Table II. 4.6.6 Dynamic durability test. A dynamic durability test shall demonstrate satisfactory tire performance during the taxi, takeoff, and landing cycles. Unless otherwise specified, test para
46、meters for taxi, takeoff, and landing are specified in Table I. A suggested test method for 120 MPH and 160 MPH tires, entitled: Alternate Qualification Procedures 120 MPH Rated Tires is provided in SAE AS4833. 4.6.6.1 Dynamic durability test temperature. Unless otherwise specified, the inflation me
47、dium temperature or highest casing temperature at the start of 80 percent of the taxi, takeoff, and landing cycles shall be no less than 105 5F (41 3C). 4.6.6.2 Cable bruise test (carrier based aircraft tires only). Unless otherwise specified, the tire shall be inflated to carrier pressure, see para
48、graph 6.6, and vertically loaded against a 1.625 inch diameter length of plain round steel stock or equivalent diameter arresting gear cable to the specified vertical load in Table I. Immediately following the release of this load, the tire shall be subjected to the same loading conditions 180 degrees from the application of the first load. 4.6.6.3 Post-test inspection. At the conclusion of the dynamic durability test, the examination of product test, see paragraph 4.6.1, shall be performed with the tire at rated inflation pressure. In addition, the t
