NAVY MIL-L-85896-1988 LADDER AIRCRAFT MAINTENANCE ALUMINUM THREE-WAY COMBINATION (STEP STRAIGHT AND EXTENSION) GENERAL SPECIFICATION FOR《一般规格铝三路组合飞机维修梯子(步骤 直接和扩展)》.pdf

1、MIL-L-5896 54 9979706 0223LL T c- d; q -90 MIL-L-85896( AS) 8 April 1988 MILITARY SPECIFICATION LADDER, AIRCRAFT MAINTENANCE, ALUMINUM, THREE-WAY COMBINATION GENERAL SPECIFICATION FOR (STEP, STRAIGHT AND EXTENSION) , This specification is approved for use within the Naval Air Systems Command, Depart

2、ment of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes the requirements for the manufacture and acceptance of three-way combination (step, straight and extension) aluminum ladders for aircraft mainte

3、nance use. 1.2 Reference identification number. The reference identification number is a definitive part number, which consists of the letter M and the basic number of the specification. Example: MXXXX. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The followi

4、ng specifications and standards form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in

5、the solicitation. SPEC IF I CATI ONS FEDERAL PPP-B-601 Boxes, Wood, Cleated Plywood PPP-T-97 Tape, Pressure-Sensitive Adhesive, Filament , Reinforced PPP-B-640 BOX, Fiberboard, Corrugated, Triple Wall QQ - S - 7 8.1 Strapping, Steel and Seals Beneficial comments (recommendations, additions, deletion

6、s) and any pertinent data which may be of use in improving this document should be addressed to: Systems Engineering and Standardization Department (Code 53) , Naval Air Engineering Center, Lakehurst, NJ Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this docume

7、nt or by letter. 08733-5100, by using the self-addressed AMSC N/A FSC 5440 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. - . THIS DOCUMENT CONTAINS A/ PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-85

8、896 54 977770b 0223382 3 MIL-L-85896 (AS) SPECIFICATIONS (Continued) MILITARY MIL-T-704 MIL-G-20241 MIL-P-23377 MIL-1-45208 MIL-C-52950 MIL-S-8 1733 STANDARDS MI L I TARY MIL-STD-105 MIL-STD-129 MIL-STD-130 MIL-STD-889 Treatment and Painting of Material Gasket Material, Wool Felt, Impregnated, Adhes

9、ive, Pressure-Sensitive Primer Coating, Epoxy Polyamide, Chemica I and Solvent Resistant Inspection System Requirements Crate, Wood, Open and Covered Sealing and Coating Compound, Corrosion Inhibit ive Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage Ident

10、ification Marking of U.S. Military Property Dissimilar Metals (Copies of specifications, standards, handbooks, drawings, publications and other Government docurflents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as dire

11、cted by the contracting activity.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which. are DOD adopted shall be those listed in the issue of the DODISS specified in the solici

12、tation. Unless otherwise spec- ified, the issues of documents not listed in the DODISS shall be the issue of the nongovernment documents which is current on the date of the solicitation. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI A74.2 Safety Requirements for Portable Metal Ladders ANSI/AWS D

13、1.2 Structural Welding Code - Aluminum, Section 5 (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMERICAN SOCIETY FOR TESTI

14、NG AND MATERIALS (ASTM) ASTM D-3951 Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Nongovernment standards and other pub1 ications are normally available from the or

15、ganizations which prepare or which distribute the documents. These documents also may be available in or through libraries or other informational ser.vices. 1 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associ

16、ated detail specifications, specification sheets or MS standards), the text of this s ecification shall take precedence. Nothing in this specification, however, has been obtained. s r: all supersede applicable laws and regulations unless a specific exemption 3. REQUIREMENTS 3.1 First article. When s

17、pecified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.3 and 6.3). The ladder shall conform to all provisions of this specification and ANSI A14.2. 3.2 Materials. Materials shall be as specified herein. Materials not specified shall be selected by

18、the contractor and shall be subject to all provisions of this specification. 3.2.1 Material deterioration and control. The ladders shall be fabricated from compatible materials inherently corrosion resistant or treated to provide protection against the various forms of corrosion and deterioration th

19、at may be encountered in any of the applicable storage and/or operating environment (see 6.2) to which the item may be exposed. 3.2.1.1 Dissimilar metals. Dissimilar metals as defined in MIL-STD-889 shall be electrically insulated from one another to minimize ur prevent galvanic corrosion. such as a

20、 coat of epoxy primer conforming to MIL-P-23377, corrosion inhibiting sealant conforming to MIL-S-81733 or chromate tape conforming to MIL-G-20241. 3.2.1.2 Identification of materials and finishes. The contractor shall identify the specific material, material finish or treatment for use with com- po

21、nents and subcomponents, and shall make information available, upon request, to the contracting officer or his designated representative. Insulation shall be provided by an insulating barrier 3.3 Construction. 3.3.1 Ladder sections. The complete ladder shall consist of two outer (wider, flared) and

22、two inner sections as depicted in Figures 1 through 3. The side rails of the same outer sections shall .be designed to have a minirnum clear width measured at the bottom of the side rail of 12 inches plus 1-1/4 minimum inches per foot of side rail length as required in ANSI A14.2. The 3 Provided by

23、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-85876 54 7797706 0223184 5 U = -_ . MI L-L-85896( AS) c two inner sections shall be hinged. These sections shall support the outer sections and allow various height and length adjustments. Each section shall

24、consist of two side rails joined by rungs at 12 inches plus or minus 1/8-inch intervals (see Figure 4). The bottom rung shall be at a distance from the ground of 6 to 12 inches maximum. The side rails shall be heat-treated structural aluminum, with a section flange of 1 inch maximum, and shall be th

25、e specified. length plus or minus 1/2 inch. 3.3.2 Height and length adjustment. The outer sections shall provide the means of leveling when the ladder is used as a stepladder in a stairway or other uneven surfaces. When used as a straight ladder or an extended ladder, the outer two sections shall be

26、come an extension of the inner sections by use of a suitable positive self-locking device. Each outer section shall slide over the inner section to obtain different heights or lengths when the sections are adjusted as a leveling device. Both outer sections shall have positive self-Tocking devices of

27、 sufficient strength to assure no slippage between the mating sections when the ladder is in use. The ladder shall lock at 12 inch intervals in ladder length. lapping inner and outer sections shall be on the same plane. 3.3.2.1 Stepladder standing height. The standing height range of the ladder in t

28、he stepladder configuration shall be 3 feet to 6 feet f 3 inches (see Figure 5a), as specified in ANSI A14.2. the ladder in the extended configuration shall be 8 feet to 16 feet f 3 inches (sea Figure 5b), as specified in ANSI A14.2. 3.3.3 Run s. The rungs shall be 12 inches minimum in working lengt

29、h (see Figure 79- 6a They shall be of suitable strength material either square, trapezoid or D-shaped. Figure 6b). This surface shall be flat and parallel to the horizontal plane plus or minus 2O in all working positions. resistant working surface. There shall be no permanent defortnation (see 4.5.2

30、4) of the rungs when tested in accordance with 4.52.1. The rung standing surface on the over- 3.3.2.2 Extended ladder standing height. The standing height range of The standing surface shall be 1 inch minimum (see All rungs shall have a skid 3.3.3.1 Bracing. The contractors standard bracing des prov

31、ided the rungs can withstand the tests in 4.5.2.1 without permanent deformation (see 4.5.2b and 4.5.24) 3.3.4 Side raiis. There shall be no permanent deformat rails when tested in accordance with 4.5.2.3 and 4.5.2.4. gn may be used failure or on of the side 3.3.5 Extension locking device. The extens

32、ion locking device shall be There shall be no permanent deformation permanentTy attached to the ladder. (see 4.5.2d) of the extension Tocking device when tested in accordance with 4.5.2.6. 3.3.6 Hinge. The hinge shall be a self-locking device and shall be permanently attached to the ladder. The hing

33、e shall have a built-in stop to prevent the ladder from jack-knifing when used as an extension ladder. There shall be no permanent deformation (see 4.5.2d) of the hinge after the ladder is. subjected to all tests specified herein. a Provided by IHSNot for ResaleNo reproduction or networking permitte

34、d without license from IHS-,-,-MIL-L-85876 5Li a 9999706 02231185 7 a T a a MI L-L-85896 (AS) 3.3.7 End caps. Any exposed end of a side rail or rung shall have a permanently attached end cap. permanent deformation (see 4.5.2a, 4.5.2b and 4.5.2d) , or end cap separation from the ladder after the ladd

35、er is subjected to all the tests specified herein. There shall be no visible damage, failure, 3.3.7.1 Hinge and extension locking device protection. The ladder design shall provide protection for the hinge and extension locking device when the ladder is tipped over from its maximum height in the ste

36、pladder con- figuration and impacts the floor. The protection device shall be permanently attached to the ladder and shall prevent any damage to the hinge and extension locking device when tested in accordance with 4.5.2.9. The protection device shall not interfere with the hinge nor the extension l

37、ocking device operation, and shall not require adjustment or alignment in order to carry out the expected protective action. There shall be no failure (see 4.5.2b) of the hinge and the extension locking device, and no separation of the protective device after the ladder is subjected to all the tests

38、 specified herein. section of the side rails to provide maximum ladder stability. The tie-downs shall be rounded or D-shaped with an inner diameter of 2 inches plus or minus 0.125-inch. There shall be no failure or permanent deformation (see 4.5.2b and 4.5.2d) of the ladder or tie-downs when tested

39、in accordance with 4.5.2.8. .3.3.9 Skid resistant feet. The side rail ends of all sections which rest on the surface shall be provided with a skid resistant swivel foot. dimensions of the skid resistant swivel foot shall not be less than the dimen- sions of the projected area outlined by the cross s

40、ection of the end of the rail. The swivel foot shall be suitable for all surface conditions (i.e., dry, wet, oily, icy). There shall be no visible damage, failure, permanent deformation (see 4.5.2a, 4.5.2b and 4.5.2d) of skid-resistant feet or com- ponent separation from the ladder, after the ladder

41、 is subjected to all tests specified herein. The skid resistant feet shall not mar, mark, or deform the aircraft structure when the ladder is extended and placed against the airqraft. 3.3.8 Tie-downs. A tie-down shall be permanently attached to each outer The 3.3.10 Platform. The work platform shall

42、 be designed as a work stand and as a utility shelf. The platform shall be removable, support 300 pounds, and shall be heat-treated structural aluminum with a minimum working area of 10 inches by 10 inches. There shall be no permanent deformation (see 4.5.2d) when tested in accordance with 4.5.2.1.1

43、. 3.4 Wei ht. The ladder assembly (ladder and platform) shall not weigh more than hnds. 3.5 Overlap. The ladder shall have a minimum overlap of 12 inches when opened to its maximum working height in the stepladder and extended configura- tions. 3.6 Slope. When the stepladder is erected on a level su

44、rface, the slope for both hinged sections shall be 3-1/2 inches, plus or minus 1/4-inch, for a foot length of side rail. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_. MIL-L-5876 54 7777906 0223186 7 W MIL-L-85896( AS) 3.7 Performance. 3.7.1 Stab

45、ility of stepladder. When erected on a level surface to its maximum height or on stairs, the stepladder shall remain in a level position with all feet on the surface and shall withstand each pull force without raising the base of the side rails from the surface, and without failure or permanent defo

46、rmation (see 4.5.2b and 4.5.24) when tested in accordance with 4.5.2.2. 3.7.2 Extension ladder assembly. The ladder in the fully extended position shall not fail or have any permanent set or deformation (see 4.5.2 and 4.5.24), when tested in accordance with 4.5.2.3. When the ladder is in the straigh

47、t or extended configuration and placed against the aircraft struc- ture, the ladder design shall not mar, mark or deform the aircraft structure. 3.7.3 Side rails. The side rails of the ladder shall not exceed 1/4-inch permanent deformation when tested in accordance with 4.5.2.1, 4.5.2.3.2, 4.5.2.4,

48、4.5.2.5 and 4.5.2.6. 3.7.4 Rungs. Rungs shall not fail or show any permanent set (see 4.5.2) when tested in accordance with 4.5.2.1 and 4.5.2.3.2. 3.7.5 Compression resistance. The ladders shall not fail or show any permanent set (see 4.5.2) when tested in accordance with 4.5.2.5. 3.8 Identification

49、 marking. The ladders shall be marked in accordance with MIL-STD-130 and shall include the following information: Part No. CAGE (Manufacturers ID) Contract No. 3.9 Treatment and painting. The ladders shall not be painted. 3.10 Welders and welding. 3.10.1 Welders. Before assigning any welder to manual welding work covered by this specification, the contractor shall provide the contracting officer with certification that the welder has passed qualification tests for the type of