1、IINCH-POUrn I MIL-T-85239 A (AS 1 20 Nov 1990 SUPERSEDES 15 Sept 1978 MI L-T-85239 (AS) MILITARY SPECI FICATION TRAILER, MUNITIONS, MHU-l51/M This specification is approved for use by the. Naval Air Systems Command, Department of the Navy and is available for use by all Departments and Agencies of T
2、he Department of Defense 1. SCOPE 1.1 Scope. This specification establishes the requjrements for a munitions trailer designated as MHU-l51/M 2. APPLICABLE DOCUMENTS 2.1 Government documents . * 2.1 .1 Specifications and standards. The following specifications and standards form a part of this docume
3、nt to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specificstions and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2) SPECI FICATIONS Mi 1 i tary MIL- L- 2 104
4、 - Lubricating Oil Internal Combustion Engine MI L-G- 10924 - Grease, Automotive and Artillery MIL-1-45208 - General Specifications for Inspection Requirements . Benefecial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should b
5、e addressed to: Systems Engineering and Standardization Department (Code 53) Naval Air Engineering Center, Lakehurst, NJ 08733-5100 by using Standard- zation Document Improvement Proposal (DD Form 1426) appearing at the end of this document or bv letter. L AMSC N/A FSC 2330 DISTRIBUTION STATEMENT A.
6、 Approved for public release; distribution is un1 imited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-T-85237A 23 m 777790b 0465727 7 m STANDARDS Mi 1 i tary MI L-STD- 129 - Marking for Shipment and Storage MI 1 -STD-281 MIL-STD-831 - Test
7、Reports, Preparation of (Unless otherwise Indicated, copies of federal and mill tary specifications - Automobi les, Trucks, Trucks-Tractors , and Trai 1 er Dol 1 i es ; Preservation and Packagi ng of and standards are available from the standardization Documents Order Desk, Bullding 4D, 700 Robbins
8、Avenue, Philadelphia, PA 19111-5094 2.1.2 Other Government Drawinss. The following other Government drawings form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS (NAVAL AIR SYSTEMS COMMAND) DLll93ASlOO - Tra
9、ller, Munitions (and all documents listed therein) (Copies of specifications, standards, and drawings required by suppliers in connection with speciflc procurement functions, should be obtained from the procuring activity or as directed by the Contracting Officer.) 2.3 Order of precedence. In the ev
10、ent of conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in thi s document, however, supersedes appl i cable 1 aws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS * 3.1 Flrst article. When sp
11、ecified (see 6.21, a sample shall be subjected to first article inspectlon(see 6.4) in accordance with 4.4. The first article sample shall be manufactured by the same procedures and processes, and at the same locatlon as proposed for the balance of the contract production. 3.2 Design and Constructio
12、n 3.2.1 Construction. The trailer shall be manufactured in accordance wi th Data List 1193AS100 and all documents listed thereon. * 3.2.2 Welding. All welding shall be in accordance with the standards required by the appl icable drawings. * 3.2.2.1 Welders. Welding shall be performed by personnel pr
13、esently qualified to the requirements of the appllcable drawings or lubricating oi 1 MIL-L-2104 as appl icable. 3.2.3 Lubrlcation. The trailer shall be lubricated with grease MIL-G-10924, 3.3 Performance Requirements, The trai ler specified herein shall be capable of transporting various munitions o
14、n unimproved roads or in an enviroment as encountered in an expeditionary airfield. The mobility of the trailer shall not be limited by any side slope of up to eight degrees angle. This trailer may be towed either by Its drawbar or be manually moved as desired. Its lighting and braking systems shall
15、 provide the necessary features required during mob1 1 i ty. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.1 Proof Load. The trailer, when supported by its running gear, shall withstand a proof load of 6,000 +loo/-O pounds. 3.3.2 Brake System
16、. 3.3.2.1 Parking Brakes. The parking brakes shall be capable of holding the trailer, loaded with a 3,000 +loo/-O pound test load, on a T5“ +5/-O grade in either direction. 3.3.2.2 Service Brakes, The service brakes shall be capable of stopping the trailer, loaded with a 3,000 +loo/-O pound test loa
17、d, within 30 feet when traveling at 20 miles per hour, on level, dry concrete. 3.3.2.3 Manual Brake System. The trailers service brake shall be equipped with a hand grip lever to facilitate manual operation of the service brake while under tow. The service brake system shall also be equipped with a
18、cable capable of automatically operating the manual brake lever thereby bringing the trai ler to a halt in the event that the drawbar should break away from the prime mover. 3.4 Towing Force. The towing force required to move the trailer from rest on smooth, dry, level, paved surface, such as brushe
19、d concrete, shall not exceed 100 pounds measured at the drawbar. 3.5 Workmanship. The trailer shall be fabricated in accordance with the drawings and shall be assembled to meet the performance requirements of the specifications. 3.5.1 Hardware and Equipment. Equipment having missing, inoperative, de
20、fective, bent, broken, or otherwise damaqed Darts, will not be acceDtable. The installation of-hardware parts, such as cakhes, pins, handles, nuts, bolts, etc. shall be accomplished in such a manner as to avoid damaging the hardware or the mounting surface. Screws, nuts, and bolts showing cross thre
21、ading, mutilation, detrimental or hazardous burrs shall not be acceptable. 3.5.2 Electrical Installation. Insulated wires shall be formed into cables or ducted whenever possible. Wires, cables, and brake lines shall be routed and positioned in a protective manner to avoid contact with rough or irreg
22、ular surfaces and sharp edges. 3.5.3 Weldments. There shall be no evidence of burn through. Angular or thickness misal lignment, warpage, or dimensional change due to heat from the welding operation shall be within permitted tolerances. There shall be no damage to adjacent parts resulting from weldi
23、ng. The quality of all welds shall conform to the appl i cable drawings. 4. QUALITY ASSURANCE PROVISIONS * 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations a
24、nd tests) as specified herein. otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless di sapproved by the Government. Government reserves the right to perform a
25、ny of the inspections set forth in this specification where such inspections are deemed necessary to ensure suppl les and services conform to prescribed requirements. Except as The 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-85239A 23 W 9
26、949906 0465929 O MIL-T-85239A(AS) * 4.1.1 Responsibility for compliance. All items shall meet all requirements of section 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or qual i ty program. The absence of any inspection requi
27、rements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice t
28、o ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual nor does it commit the Government to accept defective material. 4.1.2 Inspection System. The contractor shall provide and maintain an inspection system in acco
29、rdance with MIL-1-45208. * 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article. inspection (see 4.4). b. Quality conformance inspection (see 4.5). 4.3 Inspection conditions. Unless otherwise specified, all be performed in accord
30、ance with the test conditions specified in method document or applicable paragraph(s in the specification) inspections shall (applicable test 4.4 First Article Inspection. The first article sample (see 3.1) shall be subjected to the tests listed in Table I under first article and in the sequence as
31、shown, Trailers submitted for a first article inspection shall not be painted. of bulk material, such as steel or concrete evenly distributed over the entire trailer deck, which shall not restrict the trailer cramping angle or drawbar movement. The center of gravity ( C.G.) of the 3,000 pound test l
32、oad shall be approximately 16 inches above the trailer deck. This test load shall be used for all tests requiring a service test load. 4.4.1 3,000 pound test load. The 3,000 +loo/-O pound test load shall consist * 4.5 Quality Conformance Inspection. Trailer components shall be inspected usinci saml3
33、1 ins Plans as noted in the detai 1 drawinqs or if none are specified, as directed by the procuring activity. quality conformance in accordance with Table I. The complete bailer shall be inspected for Test Methods. 4.6.1 Visual Examination. Each trailer shall be examined visually to determine compli
34、ance with the requ rements of this specification for which tests ar attention shall rcuits and brake are not specified, including mater be given to routing protection and lines. als and workmanship. Particu functioning of the lighting c 4,6.2 Conformance to Drawings. Each trailer shall be inspe ted
35、to determine conformance to the engineering drawings. Dimensions and attributes not in ompl i ance with draw! ng to1 erances shall not be acceptabl e. 4.6.3 Functioning. Each trailer shall be examined and tested to determine that its wheels are correctly aligned, that all brake systems function, inc
36、luding back-up, and are correctly adjusted, that the electrical system is in proper working order, that all points requiring lubrication are properly lubricated, and that wheel bearings are properly adjusted and lubricated. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
37、ut license from IHS-,-,-799470b 0465930 7 - % MIL-T-85239 A 2 3 MI L-T-85239A(AS) - _ TABLE I. TESTS AND TEST SEQUENCE NAME OF TEST TEST SEQUENCE REQUIREMENT TEST FIRST QI PARAGRAPH PARAGRAPH ARTICLE COI INSPECTION II Group A Nondestructive InsPections, Visual it should not be over Xinch. If toe-in
38、is not as stated, adjust to O to Xinch. For adjustment, loosen jam nuts on both ends of the tie-rods and rotate tie-rods in or out as required using only standard automobi le mechanics tool s. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-T
39、-5239A 23 9999906 0465933 9 SURFACE CONDITION SPEED Level Paved Highway 15-20 MPH Graded Gravel Road 5-10 MPH # 5-10 MPH MI L-T-852 39A (AS 1 DISTANCE 100 Miles 50 Miles 5 Miles 4.6.3.2 Wheel Bearing Adjustment. To adjust wheel bearings; jack or prop trailer to raise wheel off the ground, spin the w
40、heel and tighten adjusting nut until a heavy drag is felt, then loosen nut until wheel rotates freely and bearing end play does not exceed 0.002 to 0,003 inches, install cotter pin through nut and axle, secure it and replace grease cap. A scale shall be placed between the prime mover and the drawbar
41、 of the trailer, loaded with a 3,000 +loo/-O pound test load (see 4.4.1). the loaded trailer, with its brakes released and with the trailer on level concrete. 4.6.4 Towing For.ce Test. The prime mover shall apply a gradual towing force through the scale to The trailer shall roll before the scale reg
42、isters 100 pounds. 4.6.5 Side Slope Test. The trailer, loaded with a 3,000 +loo/-O pound test load (see 4,4,1), shall be made to traverse a minimum 8 degree (l%“rise/ft. slope, at a speed of 5-10 MPH for a distance of 20 feet without overturning. 4.6.6 Mobility Tests. During the following tests, the
43、 trailer shall be closely observed for its ease of handling. jacknife, shall be cause for rejection. * 4.6.6.1 Road Tests. The trailer loaded with a 3,000 +loo/-O pound test load, (see 4.4.1) shall be subjected to the following road tests in Table II. Any tendency to yaw, sway, dog walk, or TABLE II
44、. Road test conditions 4.6.6.2 Maneuverability. Upon completion of testing in paragraph 4.6.6.1, the loaded trailer shall be towed over level paved highway, at speeds of eight (8) MPH through twenty-five (25) right circle turns and twenty-five (25) left circle turns, both at maximum cramping angle,
45、stops at speeds of 20 MPH. At the conclusion of these tests and those described in paragraph 4.6.6.1, the vehicle shall be closely examined. excessive wear or damage shall be cause for rejection. It shall then perform twenty-five (25) sudden Any evidence of 4.6.7 Brake Systems Tests. 4.6.7.1 Service
46、 Brakes. the trailer loaded with a 3,000 +loo/-O pound test load (see 4.4.1), shall be connected to a prime mover and the trailer service brakes will then be tested in the following manner. 4.6*7.1,1 Brake Stopping Capability Test. Tow the loaded trailer at a speed of 20 MPH on a level, dry concrete
47、 surface. vehicle thus actuating the trailer inertia brake. feet or less of the point where brakes were first applied. exhibit no tendency to jacknife. service brakes and actuating mechanism. evidence of excessive heating or distortion shall be cause for rejection. Stop by applying brakes of towing
48、The trailer shall stop within 30 The trailer shall At the end of five test cycles, inspect the Failure to operate satisfactorily or 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.6.7.1.2 Back-up Test. After acceptance under paragraph 4.6.7.1 .l,
49、 the trailer shall be subjected to a back-up force. The service brakes shall hold momentari ly but with continued force, shall release and al low unrestricted rearward travel. The test shall be performed five times. * 4i6.7.2 Braking Capability. All trailers produced in a production run shall have the service brake verified to be in proper working order by activating the brake system at least 4 times and then visually check for any leakag
