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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NASA-STD : Abbott Aerospace SEZC Ltd.

Crimped connections shall be visually inspected in order to verifycompliance with this document and applicable requirements within NASA-STD Plating removal or 87399.4. The axial load in either direction that a contact can withstand without beingdislodged from its normal position within an insert or body.

The markers shall not leave a contaminating residue Requirement.

In some cases a demating tool may be utilized Requirement. Connectors not being activelyassembled shall be individually protected by wrapping them in bubble pack or other physicalcovering Requirement. Anyexcessive length of grounding wire may act nxsa an antenna in picking up interference. When aconnector is properly assembled, contacts are nasq inside the connector. When operators are certified to perform limited operations orprocesses, it shall be stated on the certification card Requirement.

The process of joining clean metallic surfaces through the use of solder without directfusion of the base metals.

Quality Assurance has the responsibility to verify compliance withall requirements of this document. Inspection and testing points shall be specified on theapplicable planning documents Requirement. Applicable supplier cabling and harnessing program documents,or portions thereof, accepted on other NASA contracts shall be included whenever possible toavoid duplication of effort Requirement.

Permanent bends and offsets shall be built into harnesses so that the final wiredress will not be under continuous naza and tension after installation Requirement. The crimp tensile strength i.

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The results shall be recorded and shallbe limited to one push test per contact insertion Requirement. The other end of the harness hasthe same interface as the unit.

MSFC/NASA 8739.4 Cable/Harness Certification Course

Braiding at a Breakout or Y Intersection Page 45 of Results of the visual examinations shall be maintained and available for review Requirement. Shrink sleeving shall be installed over thetermination so that it extends at least 2 crimp barrel diameters beyond the end of the contact andbeyond the insulation of the wire that has the greatest insulation gap see Figure Requirement.

Surplus strap ends shall betrimmed flush at the back end of the strap head this is done automatically by most tooling Requirement. The ferrule to be used shall be pre-tinned using asolder pot or solder iron Requirement. Acceptance criteria are described in Chapters 1 through 18,Appendix A and the following: Anoperator is trained and certified to fabricate cables and harnesses in conformance with therequirements of this Standard.

NASA-STD | NASA Technical Standards System (NTSS)

If multiple settings provide identical tensile strengths for acrimp joint, the setting selected st be the one that provides more wire breaks than wire pull-outs Requirement.

Additionalmagnification shall be used, as necessary, to resolve suspected anomalies or defects Requirement. A shielded single conductor or a combination of conductors insulated from one another multiple conductor. Page 75 of Distancesto terminations and maximum lengths of grounding wires attached directly to an individualshield are given in Table and 88739.4 in Figure Connector savers shall be clearly marked Requirement.

Upon successful course completion, a certificate shall be issued Requirement. The sleeving shall be in contact with the interconnecting harness or cable srd length Requirement. The splice provides a very small diameterprofile when installed in a harness. Supplemental lighting may be used to achieve the required lighting levels Requirement. Forexample, the gripping-end section of a connector backshell boot is shrunk over the connectorbefore the smaller cable-gripping end is heated.

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A minimum of three test samples shall be prepared for each crimptool and crimp-contact-conductor combination, at the intervals specified in These are part quantitative and part qualitative and introduce a new aspect to the competencies within Abbott Aerospace.

A plug that is inserted naa fill an unoccupied contact aperture in a connector. Strands shall be twistedtogether in syd original lay, or as nearly as possible to the original lay Requirement.

Solvent cleaning by brushing may be used. In-process surveillance of all assembly operations to verify that all processes and proceduresimplementing the requirements of this document are current, approved, adequate, and beingproperly implemented. Splicing damaged or broken conductors is not permitted. The stitching shallterminate close srd the extremity of the harness but shall not stress the wire terminations Requirement. Insert the wires from one end and adjust for stf and wire protrusion.

Strip the wires to be spliced. Pull force contact retention testing to the requirements of Table shall be performed only on devices in which the contact engaging mating ends are notaccessible Requirement. The minimum protrusion from the end of theferrule: