1、MIL-C-bl136A 59 m 9999906 OOLL505 2 m MIL-C-6l36A 10 DEC3ZG3ER 196s Superseding 27 April i950 MIL-C-6136 MILITARY SPECIFICATION CONDUIT: ELECTRICAL, FLMIBLE, SHIELDED, ALUMINUM ALLOY This specification is mandatory for use by all Departments and Agencies of the Department of Defense. FOR AIRCRAFT IN
2、STALLATIONS 1. SCOPE L.1 Scope.- This specification covers the requirements for shielded electri- cal conduit for aircraft installations. 1.2 Classification.- Flexible shielded conduit shall. be furnished in two types, as specified (see 6.2): Type I -Without outer synthetic compounded covering Type
3、II - With outer synthetic compounded covering 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the- ex- tent specified herein: SPECIFICATIONS Federal QQ-A-225/2 QQ-A-250/2 QQ-A-430
4、. Aluminum Alloy Bar, Rod, and Wire; Rolled, Drawn, Aluminum Alloy 3003, Plate and Sheet Aluminum Alloy Rod and Wire; for Rivets and Cold or Cold Finished, 3003 Heading Milikary 1p-116- Preservation, Methods of MIGR-685 5 Rubber, Synthetic, Sheeted, Molded, and Ektruded MIGSTD-105 Sampling Procedure
5、s- and Tables for Inspection by MIL-STD-129 Marking of Shipments Attributes - 1-1 b ,- I TFfi DmWvT CUNTAWS .“a OF PACKING (LOCATION OPTIONAL) SECTION OF FOUR- WALL INTERLOCK FIGUFE 1. Shielded conduit ty-pe I and type II (before outer covering is applied) 3 c Provided by IHSNot for ResaleNo reprodu
6、ction or networking permitted without license from IHS-,-,-I- ,- e- . (Un z a- o .55 H / b Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- . . M IL - C - b I3 b A 5 7 = 7 7 7 7 7 O b O O I I5 0 9 T . . I_ - -.- 1 . _._._. . , . . . . . . 4 . . .“ .
7、-. . . 1 ._ . ._.- _.-._ -. . . _- _._- . -_.-_ - . . . . . - . . . . . . . . . . . . ., . ., . -_ . . _ . * _ _-. “ . -.-. - ._.-_._ . . . I_._ . . .- . . _ . -._- _-_ .-. - -. . . , . # ._. . . _. _ . .-. . . . * . . . - . I _- - ._ -. . _- - . _ . - . - .-. . . -. . ._-. -_- ._ _._ . 1 ._-.-I-.-
8、- .-i ._-._ I . . . .- 1 . . . . _._- . . . . .-. - _ . . . . . i _ - . . . . . I . 3.2.2.2 Tubing eld load.- The yield load of the tubing (conduit with outer covering and braid removed) shall be as specified in table I, 3.2.2.3 Water tightness.- Class I tubing fromwhich the shielding braid has been
9、 removed, or class II tubing from which the outer covering and the shield- % braid have been removed and which has been flexed to the bending radius specified in table I, shall not leak more than one-third of its interior vol- ume per hour when tested as specified in 4.5.2. conduit may be bent to th
10、e specified radius without damage (see 3.2.1.2). braid shall fit the tubing closely enough to prevent appreciable bunching or undue slipping, 3.2.3.1 basket types, over two and under two, or over one and under one. f the wire used for the braid and the number of wires per pick shall be as specified
11、in table I. 3.2.3 Braid.- The braid shall be applied in such manner that the finished The Braid design.- The weave of the braid shall be either of the The diameter Each pick shall contain the same number of wires, 3.2.3.2 Braid coverage.- The total number .of wires in the complete braid and the numb
12、er of parallel wires per inch length of conduit shall be such as to provide the percentage of coverage specified in table I, when calculated by the iethod specified in 4.5.4. 3.2.4 Physical properties of outer cover.- The physical properties of the outer synthetic rubber covering, both before afid a
13、fter testing, shall conform to class 2 of. MIL-R-6855. 3.3 Marking.- Types I and II conduit shall be marked by either of the following methods : (a) Continuous or interrittent lengths of waterproof tape marked with the manufacturers name or trademark at intervals of not more thon 1 foot shall be inc
14、orporated between the metal tubing and the braid. Manufacturers identification shall be placed at not more than 3-inch intervals on the inner side of the spiral convolutions of the conduit. (b) 3.4 Length of cut.- The maximum permissible length of a single piece with- in any quantity ordered is limi
15、ted only by manufacturing and handling facili- ties. shall be furnished in lengths equal to or greater than the nominal lengths spec- ified in table II. Pieces shorter than the minimum acceptable lengths specified in table II will not be accepted. and shall be measured when the conduit is fully exte
16、nded under a tension of approximately 10 percent of the yield load specified in table I. Not less than 85 percent of the total quantity of each size on order All lengths shall be continuous, unspliced, - . . . . f . . . “ . . . . .- W i .-. i- . Provided by IHSNot for ResaleNo reproduction or networ
17、king permitted without license from IHS-,-,-MIL-C-b13bA 57 7779706 O0115IO b MIM-613 6A 3.4.1 Bd protection.- Each end of each length of type I conduit shall be provided with a removable ferrule-or with suitable seizing or tape, which will prevent unraveling of the braid and cover the ends of the br
18、aid wires, 3.5 Workmanship.- All details of manufacture shall be in accordance with the best practice for aircraft flexible conduit. from all defects which would adversely affect its serviceability. The conduit shall be free 3.5.1 Interior.- The interior surface of tha conduit shall be free from bur
19、rs or sharp edges which might cause abrasion of cable insulation, and shall be free from obstructions. 3.5.2 Splices.- Splices in braids shall be neatly made, and shall cause There shall be not more than no sharp or rought projections on the conduit, one spliced pick in any 2-foot length of conduit.
20、 trimmed closely. All loose ends shall be 3.5.3 -.- The ends of each length of conduit shall be cut square, and shall be free from burrs or sharp edges which would interfere with the assembly of the conduit with parts with which it is intended to be used, 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsi
21、bility for inspection.- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. ified, the supplier may utilize his own facilities or any commerciallaborzt,ory acceptable to the Government. The
22、Government reserves the right to perform any of. the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements . Bcept as otherwise spec- 4.2 Sampling.- Unless otherwise specified, sampling for examinatio
23、ns an tests shall be in accordance with MIL-STD-105. 4.3 Inspektion lot.- Conduit of one type md size presented at one time shall be considered a lot, number of coils or reels presented, sist of 4 consecutive feet of conduit. The inspection lot size shall be determined by the The sample unit for exa
24、mination shall con- P 4.3.1 Visual examination.- The conduit shall be examined for defects in material, design, construction, marking, and workmanship. conformance with specified.requirements shall be classified a defect. inspection level shall be Level II with an AQL of 4.0 defects per 100 units. A
25、ny area of non- The 4.3.2 Dimensional examination.- An examination shall be made to deter- mine compliance with dimensional requirements. in the specified tolerancesshall be classified a defect. shall be S-3 with an AQL of 6.5 defects per 100 units. Any dimension that is not with- The inspection lev
26、el 6 , ._.-. ._. . . : . . . . . 1 . . I_ . -. . . . . .- . ” . - I . _- - -.- - -._. - . .-.-.- .-, - . . . . . . . - . . L . . . - . . .- , . _. . ,.- . - . _._- -_ . . I . _I-_-_- I._. . -_ . - .-.I.- .- . _.-. I i . _-_. - - . . - . -. -., :. . . ._. *.-.*-.- -. L -_-.-._. . e.-.- . . . . -. .-
27、. . ”_._ - . .- . .- . . .e -* .- - -_ -l-_._l_ .-. . * .-.- . .-, -.-._ . . 3 . . - . -_ - ._ . -.- . -. . . . . . . . . . .* . . . . . . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILC-6136A 4.3.3 Testing of the end item.- Testing shall be
28、 performed on each sam- ple unit in accordance with 4.5.1, 4.5.2, 4.5.3, and 4.5.4, The inspection level shall be S-2 and any failure to meet the specified requirements shall be cause for rejection of the lot. 4.4 Test reports.- When required by the contract or order (see 6.2), test reports shall be
29、 furnished in duplicate showing quantitative results for all tests and analyses required by this specification, 4.5 Inspection methods.- 4.5.1 Bending radius.- The specimens for the bending test shall be of a length approximately four times the required bending radius. One end of the specimen shall
30、be fastened tangentially to the surface of a cylindrica1,form so as to hang vertically, in a plane normal to the axis of the form, and the weight specified in table I shall be attached to the lower end. the form shall be as specified in table I. The form shall be slowly rotated 225 degrees to the po
31、sition shown on figure 2. within 1/8 inch of the form, at any point along its curvature between the point of attachment and a point diametrically opposite shall constitute cause for rejection. The radius of Failure of the conduit to come 4.5.2 Watertightness.- Specimens for this test shall be taken
32、from the flexed portion of specimens previously subjected to the bending radius test and shall be of a length approximately 15 times the nominal inside diameter. After removing the shielding braid, both ends shall be taped with friction or masking tape over a distance equal to the nominal inside dia
33、meter. snugly in each end and the ends shall then be dipped in molten paraffin or wax as far back as the inner edge of the tape to insure watertightness. 4.5.2.1 Specimens prepared as noted above and in an axially straight posi- tion, shall be submerged horizontally in water so that the top of the c
34、onduit is at least 2 inches below the surface of the water. After submersion as spec- ified in 3.2.2.3 the specimen shall be quickly and carefully removed. The con- tents (admitted water) shall be drained into a suitable receptacle, and weighed for calculation of amount of leakage. terior volume of
35、the specimen shall be taken as the volume of a cylinder with a diameter equal to the minimum inside diameter permitted for the conduit under test, and with a length equal to the extended length of the specimen. Corks shall be fitted :;- For the purpose of this test, the in- 4.5.3 Yield load of tubin
36、n.- Specimens for this test shall be at least 74 inches long and the shielding braid shall be removed, the testing machine shall be accomplished by means of plugs inserted at least l: FIGURE , 2. Bending radius test setup (diagrammatic) . . . . .- ._._._ . .-.- . - I . - .-.I . . . _. . _-. 8” _I .
37、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-61-3 6A 4.5.4 Braid coverage;.- The coverage of the wire braid shall be determined by Percent coverage = i00 (P + P (i-P) Where : the following formula: AB c cos oy ,A total number of wires = tota
38、l number of parallel wires Minimum allowable diameter of the braid wire P= A = B = C = Pitch = D = (Max. allowable OD of conduit -2B) x 3.U A Parallel wires pel. inch CJP = Pitch angle = arc Tan C/D The definitions contained in this specification shall apply in the use of the above Tormula (see 6,3)
39、. Note: 4.6 Preparation for delivery examination.- An examination shall be made to determine compliance with the packaging, packing, and marking requirements con- tained in section 5. size shall be the number of containers offered at one time, formance with specified requirements shall be classified
40、 as a defect. spection level shall be S-2 with an AQL of 4.0 defects per 100 units. The sample unit shall be one shipping container and the lot Any area of noncon- The in- 5. PREPARATION FOR.DELIVERY 5.1 Preservation and packaRinpl.- Preservation and packaging shall be level A or C, as specified (me
41、 6.2). 5.1.1 Level A.- 5.1.1.1 Cleaning,- Conduit shall be cleaned in accordance with -116, process C-l. 5.1.1.2 Dryinpl,- The drying procedure used shall not be injurious to the item, !5.1,1.3 Preservation application,- None required. 5,l.l.k Unit packaging;.- Each length of conduit shall be furnis
42、hed in coils of sufficint diameter to prevent excessive bending of the conduit. shall be securely tied in three places equidistantly spaced around the circumfer- ence of the coil with jute rope, filament tape or .metal ties. are used, protectors shall be applied under all ties. ganner that will prov
43、ide adequate protection against corrosion, deterioration, and physical damage during shipment from the supply source to the first receiving activity for immediate use. This package may conform to the suppuerfs commercial practice for retail distribution when such meets the requirements of this level
44、, Each coil When metal ties 5.1.2 Level C.- Each length of conduit shall be preserved and packaged in a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5.2 Packinq.- Packing shall be bevel A or 6, as specified (see 6.2). 5.2.1 Level A,- Items paxkage
45、d as described in paragraph 5.1.1.4. require no further packing. 5.2.2 Level C,- The packaged items shall be packed in a manner that will afford adequate protection against damage during direct shipment from the supply source to the first receiving activity for immediate use. form to the applicable
46、carrier rules and regulations and may be the suppliers commercial practice when such conforms to the requirements of this level. This pack shall con- 5.3 Marking.- In addition to any special marking required by the contract or order, marking shall be in accordance with MIL-STD-X?9, 6, NOTES 6.1 Inte
47、nded use.- The flexible shielded conduit is intended for use in aircraft electrical systems. 6.2 Ordering data.- Procurement documents should specify: (a) (b) Type required (see 1.2). (c) (d) Length required. (e) (f) Title, number, and date of this specification. Nominal size of conduit (see table I
48、). Conduit wiU. be purchased on a length basis, the unit of length being 1 foot. Report requirements (see 4.4) e Levels of preservation, packaging, and packing required (see 5.1 and 5.2). 6.3 Definitions,- (See figure 1.) 6.3.1 Total number of wires.- The total number of wires in any section taken normal to the axis of the conduit. h.- The total number of parallel e wire) counted along one inch of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
