1、 Comments, suggestions, or questions on this document should be addressed to: WR-ALC/GRVEB, Robins AFB GA 31098-1813. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil . AMSC N/A FSC 1730 DI
2、STRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-PRF-32058A(USAF) 23 August 2012 SUPERSEDING MIL-PRF-32058(USAF) 18 June 2003 PERFORMANCE SPECIFICATION CHOCK, WHEEL-TRACK - AVIATION, ADJUSTABLE ROPE TYPE This specification is approved for use by the Department of t
3、he Air Force and is available for use by all Departments and Agencies of the Department of Defense. 1 SCOPE 1.1 Scope. This specification covers the requirements for aviation wheel- track chocks of the adjustable rope type. 1.2 Classification. The chocks are of the following types, sizes, and classe
4、s (see 6.2). 1.2.1 Types. The chock types are as follows: Type I - Made of a material whose physical properties meets or exceeds those listed in Table I. Table I. Physical properties Property ASTM Method Value Specific Gravity D-792 1.04 Shore Hardness D-2240 94A/45D Taber Abrasion D3489 200 mg loss
5、 H-18 Wheel 1,000-g Load, 1,000 Tensile Strength at Break D-412 2,400 lb/in2Flexural Modulus D-790 16,000 lb/in2Tear Strength, Die C D-624 450 lbf/in Thermal Coefficient of Linear Thermal Expansion D-696 78E-06 in/in/F INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted w
6、ithout license from IHS-,-,-MIL-PRF-32058A 2 Type II Not Used. 1.2.2 Size. Chock sizes are as follows: Size 1, Size 2, Size 3, Size 4, and Size 5 1.2.3 Class. The chock classes are as follows: Class A - For use in dry, wet and ice-free weather conditions. Class B Not Used Class C Not Used. 2 APPLICA
7、BLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made
8、 to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The followi
9、ng specifications, standards and handbooks 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. FEDERAL STANDARDS FED-STD-595/13591 Yellow, Gloss COMMERCIAL ITEM DESCRIPTIONS A-A-52088
10、Rope, Cotton, or Cotton/Polyester Blend DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-5606 Hydraulic Fluid, Petroleum Base; Aircraft, Missile and Ordnance MIL-DTL-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5 MIL-PRF-6083 Hydraulic Fluid, Petroleum Base, For Preservation and Operation MIL-DTL-831
11、33 Turbine Fuel, Aviation, Kerosene Type, JP-8 (NATO F-34), NATO F-35, and JP-8+100 (NATO F-37) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 3 MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Metric, NATO C
12、ode Number H-537 MIL-PRF-87257 Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile DEPARTMENT OF DEFENSE STANDARDS MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests DEPARTMENT OF DEFENSE HANDBOOKS MIL-HDBK-808 Finish, Protective
13、and Codes for Finishing Schemes for Ground and Ground Support and Equipment (Copies of these documents are available online at https:/assist.dla.mil/quicksearch/ or from the Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government do
14、cuments, drawings, and publications. The following other Government documents, drawings, and publications 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. AIR FORCE MANUAL AFM 32-11
15、23 Airfield and Heliport Planning and Design (Application for copies should be addressed to the contracting Officer.) AIR FORCE DRAWINGS 42D6594 Chock Assembly-Wheel, Adjustable Rope Type (Application for copies should be addressed to the contracting Officer.) 2.3 Non-Government publications. The fo
16、llowing 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. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 1655 Standard Specification for Aviation Turbine Fuels AS
17、TM D 5340 Standard Test Method for Airport Pavement Condition Index Surveys Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 4 (Application for copies should be addressed to American Society for Testing and Materials, 1916 Race Street,
18、Philadelphia, PA 19103 or order through the web site www.astm.org .) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) SAE AMS 1424 Deicing/Anti-Icing Fluid, Aircraft, SAE Type I (Application for copies should be addressed to Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale PA 15096-0001, or
19、order through the web site www.sae.org ) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Noth
20、ing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3 REQUIREMENTS 3.1 First article. When specified (see 6.2), four samples (two pairs)shall be subjected to first article inspection in accordance with 4.2. 3.2 Description. A pair
21、of wheel chock assemblies are required to be secured around an aircrafts wheel and keep it stationary in the environmental conditions specified herein. 3.3 Size and weight. Chocks (synonymous with chock assemblies) shall be as light as possible while meeting all requirements of this specification. M
22、aximum weight of a chock shall not exceed 45lbs. In order for the chocks and lanyards to properly interface with military aircraft landing gear the size measurements shall be as specified in Table II. Table II. Chock sizes. Size Chock Length (in.) * Minimum Chock Height (in.) * Minimum Chock Width (
23、in.)* Lanyard Length (in.)* Wheel and Tire Assembly Outside Diameter (in.) 1 14 4 6 60 Up to 33 2 20 6 8 92 Greater than 33 3 24 4 6 60 Up to 33 4 36 6 8 92 Greater than 33 5 56 6 8 144 For dual or tandem main gear Note: * Tolerances for dimensions are +0.5/-0.0 inches. 3.4 Components. The chock ass
24、embly shall consist of a single chock block and a lanyard. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 5 3.5 Materials. Unless otherwise specified herein, the materials used shall be in accordance with the manufacturers materials s
25、pecification for wheel chocks. All materials shall be selected based on the defined purpose for the specified service life at the environmental extremes specified herein. The use of recovered material made in compliance with regulatory requirements is acceptable providing all requirements of this sp
26、ecification are met. 3.5.1 Materials for Type I chock. The material for chocks shall be any material whose properties meet or exceed those of Table I. 3.5.2 Prohibited materials. Materials which may cause sparks, break apart, become contaminated with or have its structural integrity compromised by a
27、ircraft fluids are prohibited and shall not be used. 3.5.3 Fungus proof materials. Materials that are nutrients for fungi shall not be used. 3.5.4 Protective treatment. Coatings subject to failure at the extremes specified herein shall not be used. 3.6 Design and construction. A pair of chock assemb
28、lies coupled together in accordance with the aircraft specific technical order shall hold the aircraft at the environmental extremes specified herein. 3.6.1 Foreign Object Damage (FOD). Any component that must be removed for inspection, service, or operation shall be retained by wire rope lanyard or
29、 chain preventing it from becoming separated from the chock. 3.6.2 Finish. The chock and all components shall be constructed and finished in a workmanlike manner. Particular attention shall be given to elimination of sharp edges, splinters, and burrs, surface preparation, and finish. Chock shall be
30、finished in accordance with MIL-HDBK- 808. 3.6.3 Color. The chock block shall be color 13591, yellow, as specified in FED-STD-595, or commercial equivalent. If it is impractical to make the chock yellow, the chock shall be reflectorized. Chock color shall remain steadfast in the environmental condit
31、ions specified herein. 3.6.4 Lanyard. The lanyard shall be made from rope specified in A-A-52088. 3.6.5 Slippage. The bottom surface of chock block shall not slip on bare or wet ramp surface. Ramp surface shall be “good” as specified in ASTM D 5340. 3.6.6 Buoyancy. The chock shall not float in water
32、. 3.6.7 Compression. The chock shall withstand a minimum applied weight of 170 psi, with a minimum overall weight of 3,500 lbs. for at least 15 minutes. 3.6.8 Part or identifying number. The part or identifying number (see 6.3) shall be permanently and legibly marked on the lanyard end of the chock
33、in 0.5 inch characters minimum. The use of adhesive labels and data plates is prohibited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 6 3.7 Durability. Chocks shall not require more than simple inspections to insure chock block is
34、free of cracks, wear, and deformation and lanyard is secure, the proper length, and free of wear. Chocks shall withstand the rigors of routine impacts on concrete in normal daily conditions. Normal conditions are defined as between 0 F and 120 F, at any humidity. One person, in less than 30 minutes,
35、 shall be able to perform all daily inspections and service tasks, including, but not limited to, inspection for cracks, wear, deformation, and insuring rope is properly secured and of proper length. 3.8 Performance. a. Full time exposure to temperature ranging from -60 F to 180 F. b. Full time expo
36、sure to relative humidity of 100%. c. Full time exposure to UV light. d. Precipitation as encountered in any locale in any season. 4 VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2) b. Confor
37、mance inspection (see 4.3) c. Operational test (see 4.7) Requirements shall be verified in accordance with Table III. TABLE III. Requirement verification matrix. Section 3 Requirement Verification Method Section 4 Verification 3.1 First article. Not Applicable (N/A) 3.2 Description. N/A 3.3 Size and
38、 weight. Examination 4.6.2 Dimensional check. 4.6.3 Weight check. 3.4 Components. N/A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 7 TABLE III. Requirement verification matrix Continued. Section 3 Requirement Verification Method Sec
39、tion 4 Verification 3.5 Materials. N/A 3.5.1 Materials for Type I chock. Examination 4.6.1 Examination of product. 3.5.2 Prohibited materials. Examination 4.6.1 Examination of product. 3.5.3 Fungus proof materials. Examination 4.6.1 Examination of product. 3.5.4 Protective treatment. Examination 4.6
40、.1 Examination of product. 3.6 Design and construction. Examination 4.6.1 Examination of product. 3.6.1 Foreign object damage (FOD). Examination 4.6.1 Examination of product. 3.6.2 Finish. Examination 4.6.1 Examination of product. 3.6.3 Color. Examination 4.6.1 Examination of product. 3.6.4 Lanyard.
41、 Examination 4.6.1 Examination of product. 3.6.5 Slippage. Examination 4.6.1 Examination of product. 3.6.6 Buoyancy. Test 4.6.4 Buoyancy test. 3.6.7 Compression. Test 4.6.5 Compression test. 3.6.8 Part or identifying number. Examination 4.6.1 Examination of product. 3.7 Durability. Examination 4.6.5
42、 Compression test. 4.6.6 Impact test. 3.8 Performance. N/A 3.8.1 Environmental conditions. 4.6.8.1 High temperature test. 4.6.8.2 Low temperature test. 4.2 First article inspection. The first article chocks shall be subjected to the examination and tests described in 4.6.1 through 4.6.8.2. The contr
43、actor shall provide or arrange for all test equipment and facilities. Unless otherwise approved by the procuring activity, all first article chocks shall be in the same configuration at all times and configuration changes shall not be made during the first article inspection. The contractor shall in
44、clude a statement of conformance Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32058A 8 certifying that the material properties of the chock material meet or exceed values listed in Table I. 4.3 Conformance inspection. Each production chock
45、 shall be subjected to the examination described in 4.6.1. 4.4 Test rejection criteria. a. Failure or evidence of impending failure, permanent deformation, or wear beyond limits. b. Conditions presenting a safety hazard to personnel during operation, service, or maintenance. c. Failure to attain the
46、 specified performance requirements. 4.5 Rejection and retest. If a chock fails first article inspection, the chock will be considered rejected until the cause is determined and corrective action is taken, only then shall retest be accomplished. 4.6 Testing methods. 4.6.1 Examination of product. Eac
47、h wheel chock shall be examined to verify compliance with the requirements herein prior to accomplishing any other demonstrations or tests listed in 4.6. A contractor-generated, Government-approved checklist (part of the test procedure) shall be used to identify each requirement not verified by an a
48、nalysis, certification, demonstration, or test, and shall be used to document the examination results. Particular attention shall be given to materials, workmanship, dimensions, surface finishes, protective coatings and sealants and their application, welding, fastening, and markings. Proper operati
49、on of each wheel chock function shall be verified. Certifications and analyses shall be provided in accordance with Table IV. Each production chock shall be inspected to a Government-approved reduced version of the checklist. 4.6.2 Dimensional check. Dimensions for the wheel chock and lanyard shall be as specified in Table II. 4.6.3 Weight check. A single chock
