1、flIL-L-3B484 42 7777706 0233754 m C45-5Q- . MIL-L-38484 (USAEj 92- December 1966 SUPERSEDING MIL-L-26558B(USAF) 6 April 1960, and 12 October 1961 MIL-L-26559A(USAF) MILITARY SPECIFICATION LIFE PRESERVERS, UNDERARM, PNEUMATIC 1. SCOPE MIL-C-19002 1.1 Scope. This specification covers the requirements
2、for two types of pneumatic underarm life preservers. MIL-C-19377 1.2 Classification. The life preservers MIL-C-25369 shall be of the following types, as speci- fied (see 6.2) : LPU-3/P - For parachute installation MIL-L-27639 LPU-1O/P - With adjustable harness 2. APPLICABLE DOCUMENTS 2.1 The followi
3、ng documents, of the issue FED-STD-151 in effect on date of invitation for bids or FED-STD-601 request for proposal, form a part of this specification to the extent specified herein. FED-STD-751 SPECIFICATIONS STANDARDS Federal Cloth Coated; and Tape, C o at e d Cloth-Chloro- prene on Nylon, Pneu- m
4、atic Life Preserver Cloth, Nylon, Twill, In- flatable Life Preserver Cylinder, Carbon Diox- ide, for Inflation of Pneumatic Life Pre- servers Life Preserver Inflat- ing Assembly FLU-1/P Metals; Test Methods Rubber: Sampling and Testing Stitches, Seams, and Stitchings Federal Military MIL-STD-105 V-T
5、-295 Thread, Nylon Military MIL-STD-130 MIL-L-5024 Lubricant, Inner Tube, MIL-STD-143 Aircraft Tire roprene MIL-A-5540 A d h e S i v e, Polychlo- MIL-V-5774 Valve, Oral Inflation MS33586 MIL-C-7515 Cord, Nylon, Coreless S a m p 1 i n g Procedures and Tables for Inspec- tion by Attributes Identificat
6、ion of US Mil- itary Property Specifications and Stan- dards, Order of Prece- dence for the Selection of Metals, Definition o f Dissimilar FSC 4220 Licensed by Information Handling ServicesMIL-L-38484 (USAF) DRAWINGS 52B6586 Tube - Oral Inflation, Pneumatic Survival Equipment 58J3590 Container - Par
7、achute Flotation C e 11, Pneu- matic Underarm Life Preserver 58K3588 Cell - Flotation, Pneu- matic Underarm Life Preserver 58K3589 Container -Harness, Flotation C e 11, Pneu- matic Underarm Life Preserver 61B4286 Stem - Inflator Valve, Life Preserver C e 11, Assembly of (Copies of specifications, S
8、ta nd a rd S, drawings, and publications required by suppliers in connection with specific pro- curement functions should be obtained from the procuring activity or as directed by the contracting officer,) 3. REQUIREMENTS 3.1 Preproduction. This specification makes provisions for preproduction test-
9、 ing. 3.2 Components, The life preservers shall consist of the following major com- ponents: Item No. Quantity Item Name 1 2 Flotation cell 2 2 Container 3 2 Inflation assembly, mechanical 3.3 Selection of specifications and stan- necessary commodities and services not - dards, Specifications and st
10、andards for specified- herein shall be selected in ac- cordance with MIL-STD-143. 2 3.4 Materials 3.4.1 Elastomeric or rubber materials. Unless otherwise specifically approved by the procuring activity, all elastomeric or rubber materials and component parts used in the life preservers shall have be
11、en manufactured within 12 months of the date of delivery to the Government, 3.4.2 Metals, Metals shall be of the corrosion-resistant type or suitably treat- ed to resist corrosiondue to salt spray or atmospheric conditions likely to be met in storage or normal service. 3.4,2.1 Dissimilar metals, Unl
12、ess suit- ably protected against electrolytic corro- sion, dissimilar metals shall not be used in intimate contact with each other, Dis- similar metals are defined in MS33586. 3.4.3 Flotation cell cloth, The coated cloth used in the construction of the flotation cells shall conform to type I of MIL-
13、C-19002 with the exceptions specified in 3.4.3.1. All defects in the cloth coating not specifically covered by the applicable table of MIL-C-19002 shall be reinforced on the coated side with 1-inch-diameter discs of tape. Not more than two such discs shall be permitted in any one cell, The discs sha
14、ll be applied by cementing, The tape used in the construction of the cells shall conform to type II, III, or IV Of MIL-C-19002, 3.4.3.1 Exceptions ta MIL-C-19002. The following exceptions shall amlv to the me I coated 6 o t h-covered by MIL-C-l90%2: I a. In the paragraph entitled “Base Cloth” of MIL
15、-C-19002, the sentence which states that the base cloth shall conform to the requirements of MIL-C-19377 shall be modified to read as follows: The base cloth shall conform to the requirements of Licensed by Information Handling ServicesMIL-C-19377 except that any amendments made toMIL-C-19377 shall
16、not apply and that, in lieu of the table entitled “Tableof Defects,” the following shall apply: (1) The cloth shall be subjected to the quality conformance inspection. T h e quality conformance inspection S h a 11 c.onsist of testing samples from each lot for conformance to section 3 of the specific
17、ation and an examination of the sample of the filled shipping container from each lot for conformance to the packaging, packing, and marking require- ments. A lot shall consist of cloth made essentially under the same conditions and in a single production run. In addition, a sample shall be selected
18、 from each lot in accordance with MIL-STD-105 and shall be tested by running it over a bank of lights having sufficient intensity to reveal defects in the cloth at a distance of .2 feet. All visible irregularities, in- cluding burl marks, shall be considered defects and shall be graded as specified
19、herein. (2) Defects up to 1/2 inch in any dimen- sion shall be graded one point. Defects more than 1/2 inch but not more than 3 inches in any dimension shall be graded two points. Defects more than 3 inches but not more than 6 inches in any dimen- sion shall be graded three points. Defects exceeding
20、 6 inches to full width of one running yard shall be graded four points. For the purpose of evaluation under MIL- STD-105, the number of points shall be defined as the number of defects. The number of points or defects shall be evaluated using an. acceptable quality level of 150 defects per 100 yard
21、s. MIL-L-38484 (USAF) in the fabrication process. All imperfec- tions protruding from the surface of the cloth such as knots, fuzz balls, slubs, and kinky filling shall be removed by careful burling before the cloth is offered for delivery. b. The paragraph entitled “Resistance to Accelerated Weatkr
22、ing$ in MIL-C- 19002 shall be changed to specify the following: After exposure of the coated cloth to the 24-hour accelerated weather- ing test, by exposing the uncoated side of the cloth to the light source, the break- ing strength shall be not less than 145 pounds in the warp direction and 130 pou
23、nds in the filling direction, and the ultimate- elongation shall be not less than 22 percent in the warp and the filling directions when tested by the ravel strip method. Specimens which are tested by the grab method shall have a minimum breaking strength of 80 pounds in the warp direction and 90 po
24、unds in the filling direction and an ultimate elongation of 20 percent in either direction after weathering. A colorfastness to light equal to the standard color sample shall be maintained after weathering. (Note: Ac- cess to the standard color sample may be obtained as specified in 6.3). c. The par
25、agraph entitled “Base Cloth Defects” of MIL-C-19002 shall be changed to specify the following: After the coating process, the number of visible defects which are attributable to the base cloth shall not exceed the number existing in the base cloth before the coating process. Defects which are attrib
26、utable to the base cloth shall not be considered as coated fabric defects. Critical coating defects shall not be accepted. All coating defects in an accepted roll of finished coated -cloth shll be marked on the de- (3) Three-point and four-point defects fect and at the selvage- edge adjacent to shal
27、l be flagged in the selvage for removal the defect. 3 Licensed by Information Handling Services9999906 0233757 T 9 MIL-L-38484 (USAF) 3.4.4 Thread, Un1 es S otherwise spec- ified, the thread used in the construction of the preservers- shall be nylon, type I or II, size E, class 1 of V-T-295. 3.4.5 C
28、ement, Unless otherwise indi- cated, the cement used in theconstruction of the flotation cells shall conform to class 1, 2, or 3 of MIL-A-5540. 3.4.6 Container material. The container materials S ha 11 conform to Drawing 58K3589 or 58J3590, as applicable, 3.5 Design and construction. The life preser
29、ver shall consist of two containers attached either to an adjustable harness (LPU-1O/P) or to slide fasteners for parachute installation (LPU-3/P) and two flotation cells (a right-hand cell and a left-hand cell) with mechanical inflation assemblies, The cells shall be packed into the containers as d
30、escribed in 3.5.1. 3. 5. 1 Unit assemblx. The flotation cells shall be deflated, and a charged cylinder and inflator assembly with antichafingpad, gaskets, and cap shall be mounted on the inflator valve stem of each cell so that the cylinder lies on the cylinder outline marked on the cell. The actua
31、ting lever of the inflator shall be safety tied with a single strand of nylon thread, type I or II, claes 1, size E, conforming to V-T-295. The cylinder shall be inserted into the cylinder holder of the container, The cylinder retaining strap shall be passed around the inflator stem between the in-
32、flator and the flotation cell. The strap shall be snapped to the back of the con- tainer, The cell shall be placed so the three grommets are over the threegrom- mets in the back of the container. A dou- bled length of braided nylon cord conform- ing to type IofMIL-C-7515 shallbepassed through the ce
33、nter grommet of the con- tainer and then through the center grom- met of the cell, leaving a 1/2-inch loop at 4 the back of the container. One end of the doubled cord shall be passed through the grommets to the right of the center grom- met and through the loop at the back of the container. The othe
34、r end shall be passed through the grommets on the left, All slack shall be pulled out, and the two ends shall be tied using a square knot, The ends of the cord shall be seared, The rear lobe shall be folded to fit into the space between the cylinder and top edge of the container. The front lobe shal
35、l be folded over the rear lobe with the oral tube along the top edge of the container and with the oral valve toward the front edge of the container, Using a length of cord, the webbing closure loop shall be pulled through the grommets in the container flaps, and the closure pin shall be inserted as
36、 shown in view A of Drawing 58K3589 or 5853590, as applica- ble. The loop shall be safety tied to the closure pin with a single strand of type I or II, class 1, size E nylon thread con- forming to V-T-295. (Note: All preserv- ers shall have charged carbon dioxide cylinders installed prior to final a
37、ssembly for shipment (see 3.6.4). 3.5.2 Operation of preserver. When the complete life preserver is properly as- sembled and donned, a pull-on the knobs of the inflator lanyards shall operate the life preserver as follows: a, Break the safety ties on the closure pins b. Withdraw the closure pins fro
38、m the loops c. Break the safety ties on the inflator lever d. Actuate the inflator levers to inflate the flotation cells, Licensed by Information Handling Services3.5.3 Stitching, Except where otherwise indicated, all stitches used in the con- struction of the preserver shall conform to. type 301 of
39、 FED-STD-751, with 8 to 10 stitches per inch. All seams shall be backstitched not less than 1/2 inch, Stitch- ing shall not be used in the gas .retaining portion of the flotation cells. 3.5.4. Cementing. ither cementing r pressure curing by heat shall be-used in the construction of seams, sealing ar
40、eas, and attachments of all component parts of the preserver. All surfaoesto be cemented shall .be clean. All cement shall be fresh- and shall be mixed within 8 hours of application. Fresh cement shall not be put into containers cpntaining congealed ce- ment. The cement shall be applied over the tot
41、al contact areas and shall -extend beyond all seam tapes and attachments by- at least 1/8 inch on the inside and the - outside of the cells and not more than 3/8 inch on the outside of the cells, After cemented areas are joined, trapped air and wrinkles shall be rolled out. The interior of each cell
42、 . shall be dusted lightly with compound conforming toMIL- L-5024 to prevent adherence of nonce- mented surfaces, 3.6 Performance 3.6.1 Operation, After th e life pre- server has been properly assembled- .as specified in 3.5.1, it shall be donned by an individual who shall actuate the re- spective c
43、ells. The carbon dioxide- cylin- ders shall be discharged when a reason- able pull is applied. to the lanyards. The flotation cells shall inflate, in the time specified, to the following minimum pres- sures: 0.15 pound-per square inch (psi) 20 seconds after discharge of the-cylinder and 1.0 psi 45 s
44、econds after discharge. of the cylinders. The maximum pressure inthe cells shall not exceed 3.0 psi when the M 77777Ob 0233758 L M MIL-L-38484 (USAF) temperature of the flotation cells reaches 70 (plus or minus 2) degrees Fahrenheit. The cells shall not leak after this test. 3.6.2 Pressure. Each flo
45、tation cell shall withstand an inflation pressure of 5 psi for 8 period of 5 minutes without evidence. of failure of the materials or cemented areas or without evidenc.e of permanent distortion of the cell from its designed shape. 3.6.3 Leakage. Each flotation cell shall be inflated to 2 psi. After
46、24 hours the pressure in the cells shall be not less than 1-1/2 psi. 3.6.4 Cylinder- weight. Before the cylin- der is installed on the preserver, the cylinder and the carbon dioxide charge shall weigh not less than the gross weight marked on the cylinder. 3.6.-5 Burst. The flotation cell shall not b
47、urst when subjected to an inflation pres- sure of 12 psi, 3.6.6 Oral valve attachment, The oral valve shall be. attached to the oral tube to withstand a load of 50 pounds. 3-6.7 Adhesion. Th e adhesion of al 1 seams and attachments to the flotation cells shall be not less than -5 pounds per inch of
48、width after joining coated to . -uncoated sides of the cell cloth and not less than 7-1/2 pounds per inch of width after joining coated to coated sides of the cell cloth. 3.6.8 Leakage after operation. After the preserver has been inflated 10 times as specified in- 4.6.10, the cells shall not leak.
49、3.6.9 Buoyancy. When the flotation cells of a completely assembled preserver are inflated by the carbon dioxide cylinders, or oil-free afr, the preserver shall sup- port a weight of 70 pounds in water, 5 . _: Licensed by Information Handling ServicesMIL-L-3BqBY Y2 a MIL-L-38484 (USAF) 3.6.10 Salt spray, Unless other w i S e specified, all metal parts used in the construction of the preserver shall with- stand a 96-hour exposure to salt spray without corrosion of the base metal, 3.6.11 Color matching. The color of the materials used in the preserver shall approximately match the co
