NASA STD 8739.4 PDF

25 Jul NASA TECHNICAL. STANDARD. NASA-STD with Change 5. National Aeronautics and Space Administration. Washington, DC NASA-STD, NASA TECHNICAL STANDARD: CRIMPING, INTERCONNECTING CABLES, HARNESSES, AND WIRING (FEB ) [ SUPERSEDES NAS. NASA-STDA, NASA TECHNICAL STANDARD: CRIMPING, INTERCONNECTING CABLES, HARNESSES, AND WIRING (JUN)., The purpose of.

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Secure the ste with a spot tie or similar means to preventmovement during soldering. Spot Tie Typical Table Page 6 of Jaeger 1 at Clean and properly maintain all tools and equipment Requirement. The material is injected into moldsthat control its configuration. Shieldsshould be dressed across the inner collector ring either forward towards the connector Nsa or backwards away from the connector Figure C.

Each individual test sample shall be inspected to therequirements of this document and the observations recorded and maintained Requirement.

The main portion of a connector to which contacts and other accessories areattached.

MSFC/NASA 8739.4 Cable/Harness Certification Course

ansa Review and invoke the provisions of this Standard for in-house operations involving crimpedconnections, interconnecting cables, harnesses, or wiring of mission hardware and missioncritical ground support equipment.

After a conductor has been inserted, a tool is used to crimp the contact metal firmly onto theconductor. Insulated crimps with integral strain relief shall exhibit proper crimping of the strain relieffeature Requirement. Precautions shall be taken to prevent the mismating of connectors, caused by interchanging or byreversing, through one of the following techniques: Cable or harness assemblies with a large capacitance, e.

Scuffing from mechanicalstripping or slight discoloration from thermal stripping is acceptable Requirement.

Braidsapplied tightly shall not terminate so close to connectors that they stress wires attached to soldercups Requirement. If you have any reference material that you would like to see included in the library we would love to hear stx you.

Major breakouts normally contain alarge percentage of the wire volume, such as 25 to 30 percent or more. The part shall be positioned according to drawing masa specification requirements Requirement. Tools and equipment shall be verified for conformance to theapplicable requirements found in paragraphs 6. Utilize applicable illustrations in this Standard, supplemented as necessary, for visualstandards. The tensile strength of the crimp test sample connections shall bein accordance with Table Requirement.

If smaller wire is used these values should be adjusted accordingly. For designs involving the crimping of multipleconductors in one or both ends of the contact see Figurethe equivalent wire size EWS must be determined in order to select the appropriate contact size.

When a shielded wire is being pulled, the wire shall be gripped between the sealing grommetof the terminal junction module and the shield termination Requirement. Combing thebraid is optional. Page 62 of The conductor s shall be stripped per par The crimp tools and each contact-conductor combination to be 8793.4 in aproduction run shall be tested at the start and at the end of each work shift or production run,whichever is shorter Requirement.

The outer compression ring shall be crimped securely over theshields and inner collector ring Figure E Requirement.

NASA-STD 8739.4 – Crimping, Interconnecting Cables …

Maximum protrusion from the end of the ferrule: A minimum of three test samples shall be prepared for eachcrimp tool and crimped ring conductor s combination, at the intervals specified in Connectors not being activelyassembled shall be individually protected by wrapping them in bubble pack or other physicalcovering Requirement. Single-tape starting stitches shall be the same as a spot tie with a running end see item 2 of this paragraphor as shown in Figure View A Requirement.

Production and inspection tool calibration as per paragraph 6. One or more insulated wires or cables, with or without helical twist; with or withoutcommon covering, jacket, or braid; with or without breakouts; assembled with two or moreelectrical termination devices; and so arranged that as a unit it can be assembled and handled asone assembly.

Contact Trimmed Figure Revise list of Figures to reflect insertion Change 5 of new figures as a part of the new Chapter 19 Change 6 – Page xii: Hand probesshall not be used directly in the cable or harness connectors Requirement. Suppliers may elect to use tools not mentioned in this Standardprovided the engineering documentation is reviewed and approved by the procuring NASACenter prior to use.

NASA-STD – Crimping, Interconnecting Cables Pages 1 – 50 – Text Version | FlipHTML5

Soldershall be applied at the insulation end of the ferrule Requirement. Lash End Type Splice Prohibit unauthorized, defective, or uncalibrated tools in the work area Requirement. Either precision mechanical tools or thermal strippers shall be selected forinsulation stripping Requirement. A tie or stitch shall be placed immediately before and immediately after anybreakout of the wire or cable from the harness Requirement.

To prevent potential damage cold flow of theunderlying wire insulation, a separator e. The flux shall beapplied so that it does not flow under the insulation except for traces carried by solder wicking Requirement. One hundred percent visual inspection shall be conducted foracceptable soldering, proper identification, and freedom from damage Requirement.