AIR FORCE MIL-M-7404 D-1968 MAINTENANCE PLATFORM AIRCRAFT ADJUSTABLE 3 TO 7 FEET TYPE B-4A《B-4A型3至7英尺飞机可调整维修平台》.pdf

1、Plating, Cadmium (Electrodeposited) Zinc Coating, Electrodeposited, Requirements For Tags, Shipping And Stock Boxes, Wood, Cleated-Plywood Box, Fiberboard Preservation, Methods Of Drawings, Engineering And Associated Lists Caps And Plugs, Protective, Dust And Moisture Seal Hydraulic Fluid, Petroleum

2、 Base; Aircraft, Missile, And Ordnance Hydraulic Fluid, Petroleum Base, For Preservation And Testing Welding, Metal Arc And Gas, Steels, And Corrosion And Heat Resistant Alloys; Process For Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS Mi

3、litary MIL-STD-129 MIL-STD-O MIL-STD-143 MILS TD-162 Marking For Shipment And Storage Identification Marking Of US Military Property Specifications And Standards Order Of Precedence For The Selection Of Materials Handling Equipment : Preparation For Shipment, Storage, Cyclic Mntenance, Routine Testi

4、ng And Processing MILSTD-831 Test Reports, Preparation Of MIL-S TD-1186 . Cushioning, Anchring, Bracing-, Blooking, And Waterproofing; With Appropriate Test Methods m33540 Safety Wiring And Cotter Pinning, General Practice For DRAWING Air Force 5 4563 45 Maintenance Platform Assembly, Aircraft, Adju

5、stable, 3 to 7 Feet, Type B-hA (Copies of specifications, standards, drawings and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREIGCNTS 3.1 Preproduction. This s

6、pecification makes provision for preproduction testing . 3.2 Selection of specifications and standards. Specifications and standards for necessary comodities and services not specified herein shall be selected in accordance with MIL-STD-143. 3.2.1 AN or MIL standard parts. AN or MIL standard parts s

7、hall be used wher- ever they are suitable for the purpose, and shall be identified on the drawing by their part numbers. Commercial utility parts such as screws, bolts, nuts, cotter pins, et cetera, may be used, provided they develop suitable properties and are replaceable by the AN or MIL standard

8、parts without alteration, and provided the corresponding AN or MIL part numbers are referenced in the parts list and if practicable, on the contractors drawings. In case there is no suitable corresponding AN or MIL standard part in effect on date of invitation for bids, commercial parts may be used

9、provided they conform to all require- ments of this specification. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3 Design and construction. conform to Drawing 5456345. Design and construction of the platform shall When the drawing and this spec

10、ification conflict, , this specification shall govern. 3.3.1 Welding. 3.3.2 Threaded parts. wired in accordance with MS33540. All welding shall be performed in accordance with MIL-W-8611. Threaded parts shall be positively locked or safety 3.3.3 Hydraulic system. voir and filler opening located on t

11、he top. An air vent shall be incorporated in the filler cap. the reservoir tank to prevent the oil from splashing out when the maintenance platform is moved. An oil strainer shall be installed in the filler opening. The hydraulic system and reservoir shall be filled with hydraulic fluid con- forming

12、 to MIL-H-6083 for shipment and storage. The hydraulic system shall be equipped with a reser- A drain plug shall be provided. Means shall be provided in 3.3.3.1 Actuating pump. platform shall be designed for ease of maintenance, operation, and for resist- ance to the temperatures specified herein. T

13、he force required at the end of the handle of the pump to raise the platform from the 1ow level shall not exceed 15 pounds with 150 pounds on the platform. A maximum of a hundred strokes shall be required to accomplish the first 4 feet of adjustment. The actuating pump used in height adjustment of t

14、he 3.3.3.2 Hydraulic cylinder. Wherever practicable, the hydraulic components shall conform to AN or MIL standards. entrance of moisture into the cylinder. (rubber or metal) shall be suitable for operation in temperatures ranging from -65“ Fahrenheit (F) to +160“F. Low temperature synthetic rubber p

15、acking shall be used. A seal shall be installed to prevent All hydraulic fittings and lines The plunger or piston shall be chromium plated. 3#4 Performance. 3.4.1 Static load. a uniformly distributed load of 1,000 pounds with no permanent deformation or deflection of any member of the platform. capa

16、ble of sustaining a 300 pound load distributed ovyr an area of 25 square inches without deflection or depression of more than i inch, The maintenance platform shall be capable of withstanding The expanded metal deck shall be 3.4.1.1 Steps. 400 pounds without damage or permanent deformation of the st

17、eps. The steps or rungs shall be capable of withstanding a load of 4 35 3.4.2 Wheel locks. With all wheel locks fully engaged, no damage to the locks or slipping of wheels shall result when the maintenance platform is moved a distance of 5 feet on smooth, dry concrete. 3.5 -. All parts having the sa

18、me manufacturers part number shall be functionally and dimensionally interchangeable. The item identifica- tion and part number requirements of MILD-1000 shall govern the manufacturers part numbers and changes thereto. Provided by IHSNot for ResaleNo reproduction or networking permitted without lice

19、nse from IHS-,-,-MILM-j,!+O4D 3.6 Finish. 3.6.1 Plating. All bolts, nuts, and pins used in the construction of the platform shall be cadmium plated in accordance with QQ-P-hi6 or zinc plated in accordance with QQ-Z-325. 3.7 Identification of product. Equipment, assemblies, and parts shall be marked

20、for identification in accordance with MILSTD-130. 3.8 Workmanship. 3.8.1 General. Tfie maintenance platform, including all parts and accessories, shall be constructed and finished in a thoroughly workmanlike manner. cular attention shall be given to neatness and thoroughness of welding, brazing, pai

21、nting, riveting, and freedom of parts from burrs and sharp edges. 3.8.1.1 Riveting. Riveting operations shall be carefully performed to insure that the rivets are tight and satisfactorily headed. Parti- 3.8.2 Cleaning. The maintenance platform shall be thoroughly cleaned of loose, spattered, or exce

22、ss solder, metal chips, and other foreign material during and after final assembly. flash that may crumble shall be removed. Burrs and sharp edges as well as resin 4, QUALITY ASSURANCE PROVISIONS * 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the s

23、upplier is responsible for the performance of all inspection requirements as specified herein. the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Governmen

24、t reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as otherwise specified in 4.2 Classification of tests. platform shall be classified as follows:

25、 The inspection and testing of the maintenance a. Preproduction tests. b. Acceptance tests. 4.3 Test conditions, fluid conforming to MIL-H-5606 for the tests. The hydraulic system shall be filled with hydraulic 4.4 Preproduction testing. 4.4.1 Test sample, representative of the production equipment.

26、 designated by the procuring activity or, when so stated in the contract or The preproduction test sample shall consist of one platform It shall be tested at a laboratory 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-7404D 27 7777706 OL8.57

27、24 O W purchase order, at the contractors plant under the supervision of the procur- ing activity (see 6.2). 4.4.2 Test report. Upon completion of preproduction tests, the contractor shall submit a test report prepared in accordance with MIL-STD-831. I 4,4.3 Preproduction tests. tests in 4.6. 4.5 Ac

28、ceptance tests. Acceptance tests shall consist of: The preproduction tests shall consist of all the a. Individual tests. b. Sampling tests. 4.5.1 Individual tests. Individual tests shall consist of examination of product in 4.6.1. * 4.5.2 Sampling tests. One maintenance platform shall be selected at

29、 random from every fifty or fraction thereof produced and subjected to the following tests : a. b. Static load test (see 4.6.2). Ten percent (ten cycles) of the endurance test (see 4.6.3). 4.5.2.1 Rejection and retest. When one or more items from a production run fail to meet the specification, no i

30、tems still on hand or later produced shall be accepted until the extent and cause of failure have been determined and appropriately corrected, The contractor shall explain fully to the Government representative the cause of failure and the action taken to preclude recurrence. After correction, all t

31、he sampling tests shall be repeated. 4.5.2.2 Individual tests may continue, For production reasons, individual tests may be continued pending the investigation of a sampling test failure. Final acceptance of items on hand or items later produced shall not be made until it is determined that all item

32、s meet all the requirements of the specification. 4.5.3 Defects in items already accepted. failure could indicate that defects may exist in items already accepted. so, the contractor shall fully advise the procuring activity of all defects The investigation of a sampling test If d likely to be found

33、 and methods of correcting them. 4.6 Test methods. 4.6.1 Examination of product. determine compliance with the requirements specified herein with respect to materials, workmanship, dimensions, marking, and finish . The maintenance platform shall be inspected to 5 Provided by IHSNot for ResaleNo repr

34、oduction or networking permitted without license from IHS-,-,-77 4.6.2 Static load test. The maintenance platform shall be tested at all heights throughout its range in increments not .to exceed 6 inches, At each of these increments, a uniformly distributed load of 1,000 pounds shall be placed on th

35、e platform, No ?ember of the maintenance platform shall be depressed or deflected more than 12 inches under this load, nor shall any permanent deforma- tion or deflection of any member of the maintenance platform be evident after completion of this test. Safety pins shall not be installed for this t

36、est. * 4.6.2.1 The expanded metal deck shall be subjected to a concentrated vertical load of 300 pounds distrihuted over an area of 25 square inches. No point on the expanded metal deck shall be depressed or deflected more than k inch when subjected to this test. * 4.6.2.2 Each step or rung shall be

37、 individually tested by applying- a load of . 400 pounds at or near the center of the step. nent deformation of the steps shall be apparent at the conclusion of this test. No evidence of damage or perma- 8 4.6.2.3 Upon completion of the static load test, the maintenance platform There shall be no le

38、akage of hydralic fluid, shall be visually inspected, elongation of bolt holes, or failure of welding and materials. * 4.6.3 Endurance. The maintenance platform shall operate satisfactorily after it has been subjected to a hundred cycles of raising a 530-pound load to maximum height and lowering the

39、 load to minimum height. * 4.6.4 Settling test, With the platform raised 20 percent above the minimum height and with a platform load of 1,000 pounds, the rate of settling of the hydraulic ram shall not exceed 0.020 inch per hour. installed for this test. Safety pins shall not be 4.6,5 Wheel locks.

40、form shall be subjected to a drawbarF311 sufficient to move the unloaded maintenance platfomn a distance of 5 feet on smooth, dry concrete. be no indication of retraction, deformation, or damage to the locks or rolling of wheels. With all wheel locks fully engaged, the maintenance plat- There shall

41、4,7 Inspection of the preservation, packaging, packing and marking for shipment and storaae. Sample items or packs and the inspection of the preservation, packaging, packing and marking for shipment and storage shall be in accoi*dance with the requirements of Section 5, or the documents specified th

42、erein. 5. PREPARATION FOR DELIVEFE 5.1 Preservation and packaginc, or G as specified (see 6.2), 5.1.1 Disassembly and matchmarkinq. Disassembly shall be the minimum necessary to safeguard parts known to be subject to damage, loss or breakage in transit and to accomplish reduction in cube. parts remo

43、ved shall be reinstalled in one of the mating parts and secured to prevent their loss. Preservation and packaging shall be Level A Bolts, nuts and pins and other attaching When necessary to facilitate reassembly, parts removed and 6 Provided by IHSNot for ResaleNo reproduction or networking permitte

44、d without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-/l+Ol+D 6.2 Ordering data. Procurement documents should speciQ the following: -5 I . a. Title, number, and date of this specification. * b, Required levels of preser

45、vation, packaging, and packing (see 5.1 and Location of preproduction testing (see 4.4.1). 5.210 6 c. The margins of this specification are marked with an asterisk to indicate * 6.3 where changes (additions, modifications, deletions) from the previous issue were made. This was done as a convenience

46、only and the GovernmenL assumes no liability whatsoever for any inaccuracies in these notations. contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Biddsrs and Custodian: Air Force - 82 Arw - AV Review Activities: Air Force - 82 Aw - AV 8 Preparing Activity: Air Force - 82 Project No. 1730-0103 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-