1、c-/5-5-0 MIL-L-81787B (AS) 9 June 1983 SUPERSEDING MIL-L-81787A (AS) 1 April 1975 MILITARY SPECIFICATION LIFE PRESERVER, INFLATABLE, UTILITY, TYP8 LPP-1A This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and A
2、gencies of the De- partment of Defense. 1. SCOPE 1.1 Scope. This specification covers requirements for one type of inflatable utility life preserver designated as Type LPP-lA, 2. APPLICABLE DOCUMENTS 2,l Government documents. 2.1.1 Specifications and standards. Unless otherwise specified, the follow
3、ing specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL UU-P-2 6 8 - Paper, Kraft, Wrapping. U
4、U-T-8 1 - Tags, Shipping and StGck. PPP-B-636 - Boxes, Shipping, Fiberboard. PPP-T-76 - Tape, Packaging, Paper, (For Carton Sealing). STANDARDS FEDERAL PED-STD-751 - Stitches, Seams, and Stitchings. Beneficial comments (recommendations, additions, deletions)_ and any pertinent data which may be of u
5、se in improving this document should be addressed-to: Specifications and Standards department (Code 93), Naval Air Engineering Center, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improve- ment Proposal (DD Form 1426) appearing at the end of this document or by letter. E
6、ngineering FSC 4220 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2. other f icat MIL-L-81787B (AS) MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-130 - Ide
7、ntification Marking of U. S. Military Property. .2 Other Government documents, drawings, and publications. The following Government documents , drawings, and publications form a part of this speci- on to the extent specified herein, - DRAWINGS NAVAL AIR SYSTEMS COMMAND 68A94C 1 - Part Index, Utility
8、 Inflatable Life Preserver, Type LPP-1A. (Copies of specifications, standards and drawings required by manufacturers in connection with specific acquisition functions should be obtained from the acquir- ing activity or as directed by the contracting officer.) 2.1.3 Order of precedence. In the event
9、of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS 3.1 Qualification. The Type LPP-1A utility inflatable life preservers furnish- ed under this specification shall be products which are qualified
10、 for listing on the applicable qualified products list at the time set for opening of bids (see 4.3, 4.3.1, 6.3 and 6.3.1). 3.2 First article. When specified (see 6.2), a sample of the Type LPP-1A life preserver shall be subjected to first article inspection (see 4.4 and 6.4). 3.3 Materials and comp
11、onents. The materials and components shall conform to applicable specifications, standards and drawings as listed or required herein. Unless otherwise specified , the manufacturer shall certify that the materials and components, except for the metallic parts used in the construction of the life pres
12、ervers shall have been manufactured not more than 18 mon.ths prior to the date of delivery of the life preservers (see 6.2.2). 3.4 Design and construction. The design and construction of the LPP-1A life preserver shall be in accordance with drawings listed on Drawing 68A94C1. 3.4.1 Cut edges. All th
13、e cut edges of the uncoated nylon tapes (including the nylon fastener tapes), webbings, and cords shall be seared, prior to the fabrica- tion of the life preserver, to prevent fraying, No sharp edges shall be formed. 3.4.2 Use of the adhesive. The adhesive used shall be in accordance with ap- plicab
14、le drawing requirements. The color of the adhesive shall be natural (un- 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-L77B 42 7779706 0236334 O W pigmented). to be applied shall be thoroughly clearned with a suitable solvent in such a mann
15、er that the dusting materials (zinc stearate or talc) or any other surface contaminant are removed. Care should be exercised to ensure that the coating and the base undercloth are not damaged and the adhesion between both is not impaired in any way by prolonged exposure to the solvent. prior to the
16、application of the adhesive and shall leave no residue. shall be controlled to ensure that old adhesive ar adhesive which has partly or completely polymerized is not used. least every eight hours during the course of manufacture (see 4.5.1.1.3). The containers for the adhesive shall be free from con
17、gealed adhesive before being refilled . In all the cementing operations, the surface to which the adhesive is The solvent used shall evaporate completely The adhesive A fresh.batch of the adhesive shall be used at 3.4.3 Cementing of the seams, seam tapes, patches and attachments. Seam con- struction
18、 and seam tape, patch, and attachment applications shall be in accordance with applicable drawing requirements. The techniques and precautions outlined in 3.4.2 shall be used in order to effect optimum bonding properties. shall be applied in a straight line parallel to the edges of the seam, seam ta
19、pe, patch or attachment; and shall extend from just being visible to a maximum of 3/8 inch beyond the applicable edge. 1/2, minus O, inch. localized stiffness, shrinking, puckering, spotting or staining. The cemented areas shall not contain any voids, open channels, edge lifts, or excessive wrinklin
20、g. The adhesive The ends of seam tapes shall overlap 3/4, plus Cementing shall be performed in a manner to prevent clotting, 3.4.4 Seams and stitching. No stitching shall pass through any air retaining compartment. but not in their final attachment to the life preserver. in the accessory parts shall
21、 be accomplished as specified in the applicable drawing. All the sewing shall be accomplished with stitch Type 301 conforming to FED-STD-751, eight to ten stitches per inch. lel to the seam edge. maintained within a tolerance of plus or minus 1/32 inch. shall be backstitched, by overlapping on itsel
22、f, a minimum of 1/2 inch. breaks, skips and run-Offs shall be overstitched not less than one inch. tension shall be maintained so that there shall not be any loose ortight stitching and the lock shall be embedded in the materials sewn together. twisted, puckered or pleated and no portion of the acce
23、ssory parts shall be caught in an unrelated operation or seam. of 1/4 to 3/8 inch. The seam edges shall be properly forced out and shall not contain any folds. Sewing shall only be used in the construction of the accessory parts All the machine stitching Each row of stitching shall be straight and p
24、aral- The straightness of the stitching in any row shall be The ends of the stitching The- thread Thread No seam shall be All-the thread ends shall be trimmed to a length 3.4.4.1 Bartacking. The number of stitches per bartack shall be based pro- portionally on 1/4 inch long bartack containing a mini
25、mum of 14 stitches. length and location of each bartack shall be as specified in the applicable drawing. The 3.5 Color. The color of the LPP-1A preserver and the components shall be as specified on the applicable drawings. 3.6 Markings. Markings shall be in accordance with XIL-STD-130 and applicable
26、 Stenciling and/or silk screening methods of applica- drawing requirements. Ink, color, size and location of markings shall be as speci- fied on applicable drawings. tion are acceptable, except that markings 1/4 inch or less in height shall not be stenciled. All markings shall be thoroughly dry prio
27、r to packaging. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.6.1 Warning tag. A red warning tag conforming to -T-81, type B, not small- er than size 4, and strung with twine, shall be securely tied to the buckle of the belt assembly. The tag s
28、hall protrude from the storage-container and shall con- tain the following markings in black letters and numerals: WARNING THIS LIFE PRESERVER SHALL NOT BE USED UNTIL SUBJECTED TO THE CALENDAR INSPECTION OF NAVAIR 13-1-6 . 1, AVIATION- CREW SYSTEMS MANUAL. 3.6,2 Serial numbers. The preservers shall
29、be identified by individual serial numbers which shall be assigned by the manufacturer (see 6.2.11). shall be by a block of consecutive numbers to cover the entire acquisition document quantity. Serialization Method of marking shall be as specified in 3.6 and applicable drawings. 3.7 Performance cha
30、racteristics. 3.7.1 Weight. When inspected as specified in 4.8.1, the weight of the life preserver assembly shall not exceed 3.00 pounds. 3.7.2 Operation (carbon dioxide). When the life preserver is inflated for operations test as specified in 4.8.3, design shape shall be attained within thirty seco
31、nds. carbon dioxide or evidence of material or constructional failure in any respect. The seams of attachments shall not pucker when the compartment is inflated or de- flated. with carbon dioxide, the preserver shall be subjected to the buoyancy test (3.7.3 and 4.8.4) if required. There shall be no
32、leakage of carbon dioxide, no hindrance to the flow of Upon completion of this test and examination, and while still inflated 3.7.2.1 Oral inflation assembly operation. When inspected as specified In 4.8.3 (or 4.8.4 when applicable), there shall be no hindrance to the flow of carbon dioxide when the
33、 valve- applying the applicable acceptance criteria specified in Table III. program the samples will be returned to the contractor. Final acceptance of the lot from which the samples were selected Upon completion of this inspection. 4.7 Inspection conditions. 4 7.1 Atmospheric conditions. Unless oth
34、erwise specif ied, all the inspections required by this specification shall be conducted at an atmospheric pressure of 28 to 32 inches (711.2 to 812.8 mm) of mercury and at a temperature of 77 2 18 degrees Fahrenheit (25 k 10 degrees Celsius). If the final values of the ambient tempera- ture or baro
35、metric pressure at the end of the four hour air pressure inspections are different from the initial values recorded at the start of the inspection, the following corrections shall be made to the final pressure readings in psig. 4.7.1.1 Temperature correction. For each degree Fahrenheit rise in tempe
36、rature, 0.031 psig shall be subtracted from the final pressure reading. Fahrenheit drop in temperature, 0.031 psig shall be added to the final pressure reading. The corresponding correction per degree Celsius is 0.056 psig, For each degree 4.7.1.2 Barometric pressure correction. For each 0.1 inch of
37、 mercury rise in barometric pressure, 0.049 psig shall be added to the final temperature-corrected pressure reading. psig shall be subtracted from the final temperature-corrected pressure reading. Foi- each 0.1 inch of mercury drop in barometric pressure, 0.049 4.7.2 Pressure measurement. The pressu
38、re shall be measuredby means of a mer- cury manometer or low pressure gauge calibrated in tenths psig or fifths of inches of mercury, mercury by 0.49. Inches of mercury can be converted to psig by multiplying the inches of 4.7.3 Inspection area and equipment. The area, in which the life preservers a
39、re inspected, shall be adequately protected to preclude damage to the units. The area and inspection equipment shall be free of sharp or rough edges, burrs, protrusions, etc., which will cut, tear or damage the life preservers or components. 4.7.4 fi. When use of air is specified in an inspection, t
40、he air used shall not contain any oil or condensed water vapor. 4.8 Inspection methods. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-L77B 112 M 7779706 02361110 b E MIL-L-81787B (AS) 4.8.1 Weight. The weight ofthe life preserver (belt asse
41、mbly and pouch at- tached) with storage container and the carbon dioxide filled cylinders shall be determined on a scale capable of weighing to the nearest 0.01 pound. shall conform to the requirementsspecified in 3.7.1. The weight 4.8.2 Visual, dimensional and packaging examination. 1 4.8.2.1 Visua
42、l. Every preserver shall be visually examined for defects to determine conformance to the requirements of 3.7.6.1. 4.8.2.2 Dimensional. Every preserver shall be dimensionally examined to deter- mine conformance to the requirements of 3.7.6.2. . 4.8.2.3 Packaging. Each of the fully prepared shipping
43、containers, containing life preservers, selected as asample unit from the lot, shall be visually examined to determine that the packaging, packing, and marking conform to this specification. The list of defects, Table VI, shall be used to enumerate the defects found. 4.8.3 Operation (carbon dioxide)
44、. The presrver, removed from its storage con- tainer and pouch, shall be spread out and placed in a flat- condition on a table in the inspection area (see 4.7.3). filled cylinder installed, shall be inflated by pulling the lanyard with a quick downward movement and observed for conformance to the re
45、quirements of 3.7.2. The preserver, with the specified carbon dioxide The use of inflation assemblies solely for inspection purposes is prohibited. Test carbon dioxide cylinders (refilled cylinders) may be used for this test pro- vided they conform to applicable drawing and specification requirement
46、s. test cylinders shall be clearly and permanently marked to be readily identifiable as such. If used, Unless otherwise specified, immediately upon completion of this test and examina- tion the buoyancy inspection (see 4.8.4) shall be performed while the preserver is inflated with carbon dioxide. If
47、 the buoyancy inspection is not required (see 4.6.2), the preserver shall be completely deflated by unlocking the oral inflation valve, depressing the mouthpiece and discharging thecarbon dioxide. mouthpiece shall be released a minimum of three times and observed for conformance to the requirements
48、of 3.7.2.1. During the discharge of carbon dioxide, the 4.8.4 Buoyancy. The buoyancy inspection, when required, shall be performed in conjunction with the operation inspection (see 4.8.3) while the preserver is still inflated with carbon dioxide. -The preserver, with a 23 pound steel xeight attached
49、, sha Variety Sy, Grade 275, type-optional. joint and top and bottom flaps, closure thereof shall be accomplished by glueing. The container shall be reinforced (strappd) by two non-metallic bands, applied in accordance with applicable procedures in the appendix to PPP-B-636. . No metal staples or stitches are permitted on .the container. The eontainer body 5.2.3 Commercial. The packaged life preserver shall be packed within exterior type shipping containers in a manner that will insure safe
