Specification 5100-507 - 300 lb Light Cargo Nets.pdf

Specification 5100-507 October 2012

U.S. DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SPECIFICATION FOR

300 POUND LIGHT CARGO NETS, EXTERNAL, HELICOPTER

1. General.

1.1. Purpose and Scope. The helicopter external cargo net covered herein is established as standard in the USDa Forest Service. Cargo nets are those items which are used to gather and contain an external load suspended beneath helicopters. There are three weight classes of helicopters: light, medium, and heavy. The cargo nets covered in this specification are for use on only light and medium helicopters. additionally, the nets covered in this specification are for cargo use only. Do not use this specification for any person-lifting application, i.e., short haul.

2. aPPliCable DOCUmenTS.

2.1. Publications. The following publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the following documents are those in effect on the date of the invitation for bids.

american national Standards institute, inc. (anSi)/american Society for Quality Control (aSQ)

Z1.4—Sampling Procedures and Tables for inspection by attributes (american Society for Quality Control)

Copies of the anSi publications can be obtained by writing to the following: american national Standards, inc., 25 West 43rd Street, 4th Floor, new York, nY 10036

Or at their Web site at www.ansi.org.

2.2. Order of Precedence. in the event of conflict between the text of this document and the references cited herein, the text of this document takes precedence. nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption is obtained.

beneficial comments and suggestions related to this standard should be addressed using the comment sheet at the end of this document. remarks may be sent via electronic mail (mailroom_ wo_sdtdc@fs.fed.us) or U.S. mail to the USDa Forest Service San Dimas Technology and Development Center, 444 e. bonita ave., San Dimas, Ca 91773.

5100-507

3. reQUiremenTS.

3.1. acceptance and Testing. lot acceptance of like articles shall be performed on product sample(s) in accordance with 4.4.1.

3.1.1. First article. Unless otherwise specified, first article inspection shall be performed on a product sample(s) in accordance with 4.4.2. During the term of the contract the contractor shall be required to notify the contracting officer in writing when a component or the component supplier changes in any way, when a major manufacturing process changes in any way, or when a manufacturing location changes. The contracting officer may at any time require the contractor to submit new first article sample(s) when substantive changes occur during the term of the contract. The contractor shall deliver together with the first article all of the documentation required in 4.4.2.1.

3.2. Performance. The finished net shall be capable of performing as designed throughout the temperature range of 0 °F to 140 °F. The net shall have a working load limit of 300 pounds. The light cargo net shall have an ultimate load carry capability of at least 600 pounds, which corresponds to a load safety factor of 2. Paragraph 6.5 describes the method used by the Government.

3.3. Part and materials.

3.3.1. Component Parts. all component parts for any net shall be new and not reprocessed or reworked. When modification of commercially available or standard parts is required, engineering data or laboratory tests shall be supplied to verify that the modified part meets the requirements of the component part within this specification. each component shall be appropriate for its intended function considering the nature and adverse conditions involved in helicopter operations, including firefighting (see paragraph 6.1).

3.3.2. rope material. The entire net shall be constructed of synthetic cord. all cordage shall be fluorescent orange.

3.3.2.1. Perimeter rope. The perimeter rope shall be polyester, nylon, Dacron, Poly Dacron, or polypropylene. The perimeter rope for the net shall have a minimum ultimate strength of 2,000 pounds; and not exceed a inches in diameter. The contractor shall provide a certificate of conformance (see 3.9) for the perimeter rope used. The certificate shall indicate the breaking strength of the perimeter rope.

3.3.2.2. net mesh rope. The size of the mesh rope shall be adequate to meet the performance requirements of 3.2. However, the mesh rope diameter shall not exceed x inches in diameter. The mesh cordage shall be a braided cord. The contractor shall provide a certificate of conformance (see 3.9) for the mesh rope used. The certificate shall indicate the breaking strength of the mesh rope.

3.4. Construction and Workmanship. all netting and hardware shall be manufactured by current standard production processes to provide a clean, finished quality product.

Workmanship shall be equal to the best commercial practices consistent with the highest engineering standards in the industry, and shall be free from any defect which will impair serviceability or detract from the appearance of the product. each component and assembled net with hardware shall be appropriate to its intended function.

3.5. Splices, Terminations, and Thimbles.

3.5.1. Cordage Terminations/Cuts. all terminations or cuts made to all cordage shall be a heat cut to eliminate fraying of the cordage.

3.5.2. Perimeter rope. The perimeter rope shall have a single short splice (see figure 1) to form the perimeter loop for the net. Splices shall incorporate a minimum of three tucks, counted in each direction from the center of the splice.

Figure 1—Short splice.

3.5.3. Thimbles. Thimbles shall not be used in the construction of the net.

3.6. Product marking. each net procured under this specification shall be marked showing the net’s rated capacity (working load limit); the manufacturer name or trade mark; date of manufacture, item weight. Figure 2 is provided as an example of the required information and hole edge distance. Tags shall be permanent and securely attached to the net using a z inch 7 by 7 or 7 by 19 galvanized or stainless steel wire rope. The tag cables shall be swaged using best commercial practice, and the tag loop shall be round forming a loop between 1½ inches and 2 inches in diameter. Swage shall be made of copper. all text shall be legible, all text shall be a minimum of 0.12 inch in height, and shall be ‘silk screened,’ stamped, cut, embossed, or etched into the tags. Tags shall be made of 20 to 22 gauge stainless steel, aluminum, or brass. The size of the tag shall not exceed 1.25 inches by 2.0 inches. The corners of the tag shall be rounded and edges of the tag shall be treated to eliminate sharp edges, i.e., break sharp edges. The item weight shown on the tag shall be within one-half pound of the actual weight of a completed net.

Figure 2—Identification tag example.

WLL 300 LBS

ACME NETS

JULY 2011

ITEM WT 3.5 LBS

Hole edge distance— minimum 1 hole diameter everywhere.

3.7. Size and Construction.

3.7.1. net mesh. mesh cords shall be assembled into square webbing with maximum 4.0 inch spacing and minimum 3.0 inch measured between cords, see figure 3. The mesh shall be woven/braided where the cord intersections of the mesh shall share two or more strands of the cordage with its intersection cord. a certificate of conformance shall be provided, which indicates the number of shared strands of the cordage at the mesh intersections.

Figure 3—Mesh square size.

3.7.2. Perimeter rope. The perimeter rope shall serve as a drawstring to gather the perimeter of the net over the load as it is lifted. The perimeter rope shall have a short splice meeting the requirements of 3.5.2. The perimeter rope shall be interlaced through the mesh at the edges of the net to allow the drawstring or purse action of the net when lifted.

3.7.3. net Size and Shape. Figure 4 illustrates the shape of net. The net shall be either round or octagonal in shape. The size of the net shall be 12 feet +/- 6 inches across the diameter for the round net or the opposing parallel sides on the octagonal net.

Figure 4—Net size.

mesh sides maximum 4.0 inches typical

12 ft +/- 6.0 in 12 ft +/- 6.0 in

3.8. net Volume. The completed net shall be capable of fitting into a 0.45 cubic foot volume box (14 inches by 7 inches by 8 inches) with a compaction force of 10 pounds or less.

3.9. Certificates of Conformance. Where certificates of conformance are required, the Government reserves the right to verify by test any such item to determine the validity of the certification.

3.9.1. Certification. The contractor shall provide individual certificates of conformance for the component where required in this specification. The contractor shall provide the following information on the certificate(s):

a. item description, e.g., perimeter rope, mesh rope.

b. item manufacturer’s name, address and telephone number.

c. manufacturer’s part number.

d. Procuring document for the item (to include the quantity and date ordered).

e. manufacturer’s lot number, if applicable.

f. manufacturer’s statement, e.g., catalog sheet of safe working load and ultimate strength for the cordage, number of shared stands of cordage. The statement or sheet shall include a part number or other information that is traceable to the contractor’s procuring document, where applicable.

g. Cordage material type.

4. SamPlinG, inSPeCTiOn, anD TeST PrOCeDUreS.

4.1. General inspections and Tests. The contractor shall be responsible for delivering quality products that meet the requirements of this specification. The contractor shall perform of all inspection and test requirements prior to submission for Government acceptance and first article inspections. The contractor’s test and inspection results shall be made available to the Government for both acceptance and first article inspection; for first article inspections (see 4.4.2), the contractor’s results shall be submitted in the first article inspection package (see 4.4.2.1). The contractor may utilize his or her own test facilities or any commercial laboratory acceptable to the Government. inspection records of the examination and tests shall be kept complete and available to the Government.

4.2. responsibility for Compliance. The contractor’s inspection system shall assure that all product submitted to the Government shall meet all requirements of sections 3 and 5.

The inspections set forth in this specification shall become a part of the contractor’s overall inspection system and quality program. The absence of any inspection requirements in this specification shall not relieve the contractor of the responsibility of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements. However, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material.

4.3. Classification of inspection. The inspection requirements specified herein are classified as follows:

a. lot acceptance (paragraph 4.4.1).

b. First article inspection (paragraph 4.4.2).

4.3.1. lot. all like items presented together in one delivery will be considered one lot for the purposes of inspections.

4.3.2. First article. The contractor shall make available to the government items from which a first article(s) may be selected. The government may select one, two, or three articles for inspection based on the number of items in the lot. at least one of the sample articles will be made unserviceable as a result of the testing and will be retained by the government.

The other will be returned at the request of the contractor. The contractor shall provide the address to ship the remaining serviceable units, if they want them returned.

4.3.3. Sample for lot acceptance inspections/Tests. Sampling for lot acceptance inspection shall be in accordance with anSi/aSQ Z1.4. lot inspection shall be performed when the nets are ready for delivery. The sample size shall be per Special inspection level S-3.

4.4. inspection and Tests.

4.4.1. lot acceptance. When selected in accordance with 4.3.3, each sample item shall be inspected in accordance with table 1, lot acceptance inspections, to determine conformance with this specification. if the sample is found to have any major nonconformance, as identified in table 1, the lot shall not be accepted. additionally, if the number of minor nonconformances (per table 1) in the sample exceeds an aQl level of 1.5 percent nonconforming, the lot shall not be accepted.

Table 1—Lot acceptance inspection

Reference Nonconformance Class of Para. No. Nonconformance

3.3.2. any cordage used in the net is not synthetic. major

3.3.2. The net color is not florescent orange. minor

3.3.2.1. The perimeter rope diameter is greater than 3/8 inches (nominal). major

3.3.2.2. The mesh cordage is 3/16 inches or larger in diameter. major

3.3.2.2. The mesh cordage is not braided. major

3.4. The workmanship is poor quality such that it impairs serviceability or detracts from the appearance of the net. major

3.5.1. any of the cordage terminations or cuts are not heat cut. major

3.5.2. The splice in the perimeter rope is not a short splice. major

3.5.2. There is more than one splice in the perimeter rope. major

3.5.2. The short splice in the perimeter rope has less than three tucks on either side of the middle of the splice. major

3.5.3. Thimbles are used in the construction of the net. major

3.6. marking does not contain all of the required information. major

3.6. The hole edge distance is less than one hole diameter, see figure 2. major

3.6. Text is not at least 0.12 inches in height. major

3.6. any text is not legible. major

3.6. lettering is not ‘silk screened,’ embossed, stamped, cut, or etched into the tag. major

3.6. The tag is not made of 20 to 22 gauge stainless, aluminum, or brass; or the appropriate size. major

3.6. The wire loop attaching the tag to the net is not as required. major

3.6. The tag’s corners are not rounded. major

3.6. The tag has sharp edges. major

3.7.1. The net mesh is not formed into a square. major

3.7.1. The net mesh squares have dimension that are not as defined (between 3 and 4 inches). major

3.7.1. The mesh is not woven or braided together at the mesh intersections. major

3.7.1. The mesh intersection do not share strands from the cordage. major

3.7.2. The perimeter rope does not serve as a drawstring. major

3.7.2. The perimeter rope is not interlaced through the edges of the mesh allowing it to act as a drawstring for the net. major

3.7.3. The shape of the net is other than octagon or round. major

3.7.3. The net dimensions are other than specified. major

4.4.2. First article inspection. Unless otherwise specified (see 6.2), the first article submitted in accordance with 3.1.1 shall be inspected as specified in 4.4.1 and table 2.

Government inspection for compliance on the first article may stop upon any single failure (regardless of classification), and the sample not accepted. The contractor will be informed of the nature of the failure. additionally, the Government is not obligated to continue with first article compliance inspection, unless it is considered in the best interest of the Government.

Table 2—First article inspections

Reference Nonconformance Class of Para. No. Nonconformance

3.1.1. The contractor did not prepare and submit a complete

first article data package. major

3.2. The net did not meet the ultimate load carrying capacity test. major

3.3.1. each component of the net is not new. major

3.3.1. engineering/test data have not been provided that justify the use of modified component(s). major

3.3.2.1. The perimeter rope material is other than that specified. major

3.3.2.1. The perimeter rope has a breaking strength which is less than 2,000 pounds. major

3.3.2.1. a Certificate of Conformance, meeting 3.9, for the perimeter rope was not provided. major

3.3.2.2. a Certificate of Conformance, meeting 3.9, was not provided for the mesh cordage. major

3.7.1. a Certificate of Conformance, meeting 3.9, was not provided indicating the number of strands of the mesh cordage that are shared at the mesh intersections. major

3.8. The net does not fit into the volume specified with the

force indicated. major

4.4.2.1. First article inspection Package. The contractor shall submit to the Government along with the selected first article(s), copies of:

a. engineering analysis or test data for altered commercial products, if applicable (see 3.3.1).

b. all certificates of conformance (see 3.9), required by 3.3.2.1, 3.3.2.2, and 3.7.1

c. Company inspection records (see 4.1).

d. all test results for the article(s) (see 4.7).

e. Ultimate strength certificate (see 4.6).

f. all other material necessary to perform the inspections identified in table 2, First article inspections

4.5. Certification of Conformance. Where certificates of conformance are required, the Government reserves the right to verify by test any such items to determine the validity of certification.

4.6. Ultimate Strength Testing. The contractor shall perform testing on a sample net to verify the completed net’s ultimate strength. Testing shall place the item under the ultimate strength load specified in 3.2 and held for 10 seconds. The applied force shall be a static tensile load applied in the direction the item will encounter in its intended use.

The equipment used to apply the loading force shall be calibrated to a recognized state or federal standard. The calibration of the equipment shall be current at the time of testing.

The contractor’s sample article shall be marked “nOT FOr STOCK Or SerViCe.” The contractor shall not deliver this test article to the Government as part of any lot or first article submittal. The contractor may retain or dispose of its ultimate strength test article.

4.6.1. Ultimate Testing inspection. an item shall not fail or break (drop or spill any of its contents). The item may yield, experience plastic deformation, or change its dimensional properties as a result of the ultimate test load, but shall not fail or break.

4.7. Test results. The contractor shall have available copies of all test results performed to assure the quality or acceptability of the product submitted for acceptance. The test results shall also show the product’s acceptable range or expected test result and the item’s test value. all test equipment, which shall be used as media of inspection, shall be calibrated and current at the time of testing. Calibration shall be to a recognized State or Federal standard.

4.8. nonaccepted lots. nonaccepted lots may be offered again for inspection in accordance with paragraph 6.4 of anSi/aSQ Z1.4, except that Table ii-b – Single sampling plans for tightened inspection (master table) from anSi/aSQ Z1.4 shall be used with the parameters of paragraph 4.3.3.

4.9. Government lot acceptance. The Government will conduct lot acceptance inspections and tests to determine compliance with the specification. The Government’s inspection will be in accordance with the requirements of section 4. if lot acceptance and tests are conducted at locations other than the manufacturing facilities, the contracting officer will specify location and arrangements. in the case of onsite inspections at the contractor facility, the contractor shall furnish the inspector all reasonable facilities for his/her work.

During any inspection, the inspector may take from the lot one or more samples and submit them to an independent test laboratory approved by the Government or to a Government test facility for inspection and tests.

5. PaCKaGinG, PaCKinG, anD COnTainer/SHiPmenT marKinG.

The packaging, packing, and container/shipment marking shall be as specified in the contract or order.

6. nOTeS.

6.1. intended Use. all items procured under this specification are intended for use in the suppression of wildland fire or related activities. The wildland fire environment includes, but is not limited to, fire retardants (both long and short term); dust; moisture; pesticides, fuels (aviation, jet, gasoline, kerosene, diesel, etc.); hydraulic fluid and oils (aviation and automotive); herbicides; pesticides; and lubricants (aviation and automotive).

6.2. acquisition requirements. acquisition documents should specify the following:

a. Title, number and date of this specification.

b. if a first article sampling and inspection is required (see 3.1.1, 4.4.2, and 6.4).

c. Packaging, packing, and marking requirements (see 5).

6.3. metric equivalence. The following table provides the conversion factors to be used in creating metric equivalence for this specification.

Conversion Factors english System Calculation To Obtain metric equivalence

Pounds pounds * 0.453 Kilo grams inches inches * 2.54 Centimeter inches inches * 25.4 millimeters

Foot feet * 0.305 meter

Fahrenheit (°F-32)*(5/9) Centigrade

Foot-pounds Foot-pounds * 1.357 newton-meters

6.4. First article. When a first article sample(s) is required, it shall be inspected and approved in accordance with the first article clauses set forth in the solicitation. Specific instructions shall be included regarding arrangement for selection, inspection and approval of the first article sample(s). The first article(s) shall be subjected to the ultimate strength requirement of 3.2. as such, the first article will be consumed in the test. Hence they shall not be delivered to the Government for stock or supply.

6.5. Ultimate load Test. The net is stretched in a fixture to cause the mesh to be flat. Sand bags, representing the ultimate load of 3.2, are stacked in the center of the net. Two loops of the perimeter rope is placed into a lifting device and slowly lifted while the net mesh is aided to close around the net contents.

6.6. notice. When Government drawings, specifications and standards or other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs neither responsibility nor any obligation whatsoever.

6.7. Preparing activity. U.S. Forest Service, Technology & Development Center 444 east bonita avenue, San Dimas, Ca 91773-3198.

United States Department of Agriculture, Forest Service Standardization Document Improvement Proposal

Instructions: This form is provided to solicit beneficial comments that may improve this document and enhance its use. Contractors, government activities, manufacturers, vendors, or other prospective users of this document are invited to submit comments to the USDa Forest Service, San Dimas Technology and Development Center, 444 east bonita avenue, San Dimas, California 91773-3103. attach any pertinent data that may be of use in improving this document. if there is additional documentation, attach it to the form and place both in an envelope addressed to the preparing activity. a response will be provided when a name and address are included.

Note: This form shall not be used to submit request for waivers, deviation, or for clarification of requirements on current contracts. Comments submitted on this form do not constitute or imply authorization to waive any portion of the referenced document(s) or to amend contractual requirements.

Standard number and Title: Specification 5100-507 300 Pound Light Cargo Nets, External Helicopter name of Organization and address:

___ Vendor _____User _____ manufacturer

1. ____ Has any part of this document created problems or required interpretation in procurement use?

2. ____ is any part of this document too rigid, restrictive, loose, or ambiguous?

Please explain below.

Give paragraph number and wording:

recommended change (s):

reason for recommended change (s):

remarks:

Submitted by: (Print or type name and address - Optional) Telephone number:

(Optional)

Date:

USDa Forest Service San Dimas Technology & Development Center attn: Specification and Standards Project leader 444 east bonita avenue San Dimas, California 91773-3103

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