1、MIL-C-4 38 59A (GL) 8 March 1978 SUPERSEDING MIL-C-43859 (GL) 29 June 1973 MILITARY SPECIFICATION COUPLING, EXTRACTION FORCE TRANSFER, AIRDROP This specification is approved for use by-the Natick Research and Development Command(GL), Departmentof the Army, and is available for use by all Depart- men
2、ts and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of airdrop extraction force transfer coupling assembly, consisting of an actuatory assembly, latch assembly, link assembly, cable assembly, latch assembly adapter and link assembly adapter. 1.2 Class
3、ification. Cables covered by this specification shall be of the following lengths as specified (see 6.2) : 12 foot (3.66 m) cable 16 foot (4.88 m) cable 20 foot (6.10 m) cable 24 foot (7.32 m cable 28 foot (8.53 m) cable O 2. APPLICABLE DOCUMENTS 2.1 Issues of documents, The following documents of t
4、he issue in effect on date of invitation or bids or request for proposal, form a part of this specification to the extent specified herein. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. A
5、rmy Natick Research and Development Command, .Natick, MA 01760 by using the self-addressed Standardization Document Improvement Proposal (DU Form 1426) appearing at the end of this docu- ment or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
6、,-,-SPECIFICATIONS FEDERAL . PPP-B-56 6 .PPP-B-6 O1 PPP-B-621 PPP-B-636 PPP-B-676 PPP-T-45 MILITARY MIL-L-10547 STANDARDS - Boxes, Folding, Paperboard - Boxes, Wood, Cleated-Plywood - - Boxes, Shipping, Fiberboard - Boxes, Setup - Boxes, Wood, Nailed and Lock-Corner Tape, Gummed, Paper, Reinforced a
7、nd Plain, For Sealing and Securing - Liners, Case and Sheet, Overwrap; Water-vapor- proof or Waterproof, Flexible MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 - Marking for Shipment and Storage MIL-STD-147 - Palletized Unit Loads on 40“ X 48“ Pallets
8、 DRAWING U.S. ARMY NATICK RESEARCH AND DEVELOPMEHT COMMAND 11-1-2060 - Coupling, Extraction Force Transfer, Airdrop (A miniature copy of Drawing 11-1-2060, identified as figure 1, is attached for information purposes only.) (Copies of specifications, standards, drawings and publications required by
9、contractors in connection with specific procurement functions should be ob- tained from the procuring activity or as directed by the contracting officer.) The following documents form a part of this speci- I 2.2 Other publications. fication to the extent specified herein. in effect on date of invita
10、tion for bids or request for proposal shall apply. Unless otherwise indicated, the issue 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4 385 9A (GL) NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC . , AGENT National Motor Freight Classifica
11、tion (Application for copies should be addressed to the American Trucking Asso- ciations, Inc., Traffic Department, 1616 P Street, N.W., Washington, DC 20036.) UNIFORM CLASSIFICATION COMMITTEE, AGENT Uniform Freight Classification (Application for copies should be addressed to the Uniform Classifica
12、tion Committee, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) (Technical society and technical association specifications and standards are generally available for reference from libraries. among technical groups and using Federal agencies.) They are also distributed 3. REQUIREMENTS 3.1
13、First.article. When specified (see.6.2), the contractor shall furnish a sample for first article inspection and approval (see 4.3 and 6.3). 3.2 Materials and construction. Components of the coupling assembly shall conform to the materials, construction and supplementary processes shown or specified
14、on the Drawing 11-1-2060 and detail drawings subsidiary thereto (see 6.5). - 3.3 Performance. 3.3.1 Latch, latch adapter, link and link adapter assemblies. 3.3.1.1 Proofload. The latch, latch adapter, link and link adapter (when provided) assemblies shall show no evidence of release, failure or visi
15、ble permanent deformation when subjected to 60,000 pounds (266,890 N) proofload as specified in 4.5.2.1. 3.3.1.2 Function. The force applied to the catch component of the latch assembly to effect release and separation of the link shall be within the range of 15 to 45 pounds (67 to 200 N) with the a
16、ssemblies under 50,000 pounds (222,410 N) tension load, and not be less than 8 pounds (36 N) on reduction . of the tension load to 50 pounds (222 N) . Assemblies tested in 4.5.2.2 shali show no evidence of premature release, component failure, or loosening of friction pads in sideplates of the latch
17、 assembly. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.1.3 Impact resistance. The components retainer hook, side plates, idler link, catch, lock link, pins and idler link sleeves of latch assembly and cam of link assembly subjected to funct
18、ional tests, shall show no evidence of failure or visible permanent deformation beyond allowable limits as set forth on component parts drawings and as may result from local brinelling of impacting surfaces when examined as specified in 4.5.2.3. 3.3.2 Actuator assembly, function, 3.3.2.1 Spring outp
19、ut. The actuator assembly shall deliver an output force within the range of 200 to 300 pounds (890 to 1335 N) without evidence of failure or malfunction when tested as specified in 4.8.1.1. 3.3.2.2 Cyclic, When cycled as specified in 4.8.1.2 the actuator arm shall rotate freely and latch securely. a
20、ctuator stop block shall show no evidence of failure or permanent deformation, except as allowed by the dimensional limits o.n the drawing for the arm, and as may result from local brinelling of impacting surfaces. The arm, arm stop block and cable 3.3.3 Cable assembly. 3.3.3.1 Cable assembly proofl
21、oad. The wire rope, conduit, terminal fittings and strain relief shall show no evidence of failure, slippage or visible permanent deformation when subjected to proofloads speci-fied on the drawings, when tested ils specified in 4.8.2.1. 3.3.3.2 Friction loss. Friction loss shall conform to the requi
22、rements of Drawing 11-1-2061 when tested as specified in .4.8.2.2. 3.4 Workmanship. All components and assemblies of the extractionforce coupling shall be free of any rust or corrosion, dirt and other foreign matter. External surfaces shall be free from sharp edges or burrs. Components shall not be
23、fractured, cracked, buckled, loose, dented, missing, malformed or misaligned. 4. QUALITY ASSURANCE PROVISIOXS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-43859A(GL) forth in the specification where such inspections are deemed necessary to a
24、ssure supplies and services conform to prescribed requirements. O 4.2 Classification of inspections. The inspection requirements specified herein are c1assified.a follows: 1. 2. Quality conformance inspection (see 4.4). First article inspection (see 4.3). 4.3 First article. When a first article is r
25、equired (see 6.21, the complete coupling or cable assembly, as applicable, shall be examined for defects in table I and tested for performance requirements per 4.5.2 and 4.8 tests, as specified . 4.4 Quality conformance inspection. Except as otherwise specified herein, sampling for inspection shall
26、be performed in accordance with MIL-STD-105. 4.4.1 Component and material inspection. In accordance with 4.1, components and materials shall be inspected in accordance with all the requirements of referenced specifications, drawings, -and standards unless otherwise excluded, amended, modified or qua
27、lified in this specification or applicable purchase document. 4.4.2 In-process inspection. Inspection shall be made at appropriate stages of fabrication to determine conformance to the requirements of this specifi- . cation. The Government reserves the right to exclude from consideration for accepta
28、nce any materials for which in-process inspection has indicated non- conformance. 4.4.2.1 Heat treatment examination. Heat treated components shall be inspected to determine compliance with requirements specified on the applicable drawings. The provisions of MIL-H-6875, applicable to routine quality
29、 control, shall apply, except that batch sampling with an inspection level of S-4 and an AQL of 1.0 (percent defective) applies. 4.4.2.2 Magnetic particle inspection. Each latch and link component and the arm of the actuator assembly, Part Number 11-1-1746, shall be inspected in accor- dance with MI
30、L-1-6868 for determination of compliance with drawing requirements, Each latch and actuator assembly shall be inspected during assembly for determination of compliance with assembly requirements specified on the applicable drawings that are not susceptible to inspection after assembly. ny nonconform
31、ance shall be corrected. 4.4.2.3 Assembly. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4 3859A (GL) 4.4.3 Intermediate inspection. The sample unit for this inspection shall be one link, latch adapter, link adapter, latch, actuator or cabl
32、e assembly, as applicable (see 3.2). Lots shall be expressed in units of components of one kind for each separately procured component of the coupling assembly. inspection level shall be S-1 with an AQL of 4.0 expressed in terms of percent defective. 4.4.3.1 Visual examination, An examination shall
33、be made of the components for defects listed in table 1. The inspection level shall be I with an acceptable quality level (AQL) of 1.0 for major defects and 6.5 for total defects, expressed in terms of defects per hundred units. The . TABLE I. Classification of defects Classification Ekamine Defect
34、Major Minor Finish, protective Supplementary finish omitted, wrong type or tacky Primary finish not as specified Any area of rust or corrosion Imbedded dirt or other foreign matter Surface texture Roughness exceeds limit on: 32 and 63 microinch surfaces (810 and 1600 nm) surfaces 125 and 250 microin
35、ch - (3180 and 6250 nm) surfaces Construction and workmanship Any component missing Any fastener component wrong type or size Any component cracked, fractured, malformed or misaligned Any component not assembled or joined as specified Any weld not type and size specified, missing or incomplete Welds
36、 not flush where specified, excessive undercut or spatter Any operation (not otherwise covered) omitted or not performed as specified Any sharp edges or burrs 6 X X X X X X X X X X X Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot
37、for ResaleNo reproduction or networking permitted without license from IHS-,-,-(a) High release load. With each latch and link rigged as specified above for proofload, a suitable means for application and readout of release force shall be attached to the catch component of the latch in a manner simi
38、lar to that in which the cable assembly would normally be attached. A load of 50,000 pounds (222,410 N) shall then be applied in the manner specified above for proofload, a separate tension force applied to the catch until release occurs, and the force required to effect release recorded, (b) Low re
39、lease load. Procedure shall be as specified in (a) above except the load shall be 50 pounds (222 N). (c) The high and low release load tests, (a) and (b) above, shall be repeated in sequence, a second time. release load tests to conform to the requirements of 3.3.1.2 shall require repeating (a) and
40、(b) a third time, Failure of either the high or low release load test to.conform to 3.3.1.2 when performed the third time shall be cause for rejection of the latch and link. Failure of either or both high or low 4.5,2.3 Nondestructive. Selected latch and link combinations shall be dis- assembled and
41、 the components thereof specified in 3.3.1.3 reinspected as speci- fied in 4.4.2.2 for any evidence of test .induced cracks, and the hook, catch, idler links and pins dimensionally inspected for deformation beyond allowable limits. . Any evidence of such failure, or deformation beyond allowable limi
42、ts, shall be causefor rejection of the lot from which the sample was selected. 4.6 Inspection of packaging. An examination shall be made to determine that the preservation-packaging, packing and marking complies with section 5 requirements. for delivery except that it need not be closed. and defects
43、 applicable thereto shall be as listed in table II. closure defects shall be made on shipping containers fully prepared for delivery. The inspection level shall be S-2 with an AQL of 4.0 expressed in terms of defects per hundred units. The sample unit shall be one shipping container fully prepared C
44、haracteristics to be examined Examination for TABLE II. Packaging inspection Examine Defect Markings (exterior Omitted; incorrect; not legible; of improper size, and interior location, sequence or method of application containers) 8 Provided by IHSNot for ResaleNo reproduction or networking permitte
45、d without license from IHS-,-,-TABLE II. Packaging inspection (cont d) Examine Defect Mater ia.ls Component missing, damaged, defective, or not as specified Contents Number more or less than specified Weight exceeds maximum specified Workmanship Unit packaging not as specified; contents not snug fit
46、 in interior container; improper closure of interior container; not snug fit in exterior container; improper closure of exterior container; loose strapping; inadequate stapling, bulging or distortion of container 4.7 Examination of palletization. An examination shall be made to determine that pallet
47、ization is in compliance with 5.3. fied in table III. unit load, ready for shipment. loads submitted for inspection at one time. with an AQL of 6.5 expressed in terms of defects per hundred units. Defects shall be scored as speci- The sample unit for this examination shall be one palletized The lot
48、shall be the number of palletized unit The inspection level shall be S-1 TABLE III. Examination of palletization Examine Defect Finished dimensions Length, width or height exceeds specified maximum requirements Palletization Not as specified; pallet pattern not as specified; interlocking of loads no
49、t as specified; load not bonded with required straps as specified Weight Exceeds maximum load limits Marking Omitted; incorrect; illegible; of improper size, location, sequence or method of application 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.8 Tests. . 4.8.1 Actuator assembly, function. 4.8.1.1 Spring output, The assembled actuator, le
