1、MILITARY SPEICIFCATION COUPLING, FLEXIBLE, FUEL LINE, 125 PSI 1. SCOPE 1.1 Scope.- This specification establishes the general requirements for flexible tube couplings for aircraft fuel systems. 1.2 Classification.- Flexible tube couplings shall be capable of joining standard tubing and fitting ends
2、and shall be of the following types and sizes: Types: I For connecting two ANDlOO60 Type A rolled bead tube ends. II For connecting tm ANDlOOS machined fittings, or two ANDl0060 Type A rolled bead tube ends, or one ANDlOO5t3 machined fitting and one AND10060 Type A mlled bead tube end. III: For conn
3、ecting tmi straight tubing ends, Sizes: Type I, II and III couplings shall be of the following nominal sizes: 1, 1 1/4, 1 1/2, i 5/4, 7, 7 1/2, and 8 inches, For sizes larger than 3 inches on fitting ends in accordance with AND1oos$, the nTfl dimension shall be stabilized at “,0 and for sizes larger
4、 than 3 inches on tubing ends in accordance with AND10060 Type A, the nA18 dimension shall be stabilized at n.062ii. 2, 2 112, 3, 3 112, 4, 4 112, 5, 5 112, 6, 6 1/2, Note: . _._ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-25OLY 47 m 77797
5、0b O275543 3 = -2- HL-G2501( WAF) 2.1 “ha folloming specifications, standards, drawings, and publica- tioiis of tho issue in effect on date of invitation for bids, fonn a part of this spacification: PGIFXCATIOI?S Federal - PPP-Wl PPP-IM76 JAN-P-120 MIES-7742 MIGM5l.2 MILA4625 NN-B.91 m-B-621 m?- a-6
6、31 Boxes, fiberboard, Wood Cleated (For Boxes, ?bod, Nailed and hck-Corner Boxes, Xood, Xrebcund (For Domestic Domestic Shipnent) Shimat) PlatGe, Cadmium (Electrodeposited) Boxes; Fiber Corrugated (For Domestic Boxes; Fiber, Solid (For Domestic Boxes, Wood, Cleated-Plymod Preparation of (For wines,
7、Accessories and Other Auxiliary Equipment) Resistant Packing, HO“ Ring, Hydmcarbon Fuel oil, Lubricating, Jet Engine Alcohol; ahyl., Specially Denatured, Aircraft Rubber, Synthetic, Sheet, Molded and Ekbruded, for Aircraft Application Screw lhreads; Standard, Aeronautical Design; Special Support Equ
8、ipont (For Aeronautical and Associated Equipent) Anoic Coatings, For Aluminum and ALMiinuu Aloys Einers, Case, Waterproof - I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-250l19 97 m 773730b 0275549 5 -3- MlL-G250l Use of No. u0 Age Controls
9、 - Fuel System Synthetic Rubber Part ( Copies of specifications, standards, drawings, and publications required by contractors tn connection mith specific procurement functions should be ob- tained from the procuring activity or as directed by the contracting officer.) 3.1 dua1ification.- The fuel l
10、ine couplings furnished under this specification shall be a 2roduc-t which has been t6sted and lias passed the qual- ification tests specified herein. 3.2 Conpanent Parts.- The fuel line couplings shall ccnsist of at sealing members or parts, and a retaining mem- least the following components: ber
11、for keeping the tube or fitting ends within specified limits. 3.3 Metals. - Metals shall be corrosion-resistant or suitably treated to resist ccrrmion in fuels, water-alcohol, salt spray, or a-bmospheric conditions to which the coupling shall be subjected when in storage or during normal service use
12、. 3.301 Dissimilar metals.- Unless suitably protected against electro- , lytic corrcsion, dissimilar metals shall not be used in intiinate contact with each other. Dissimilar metals are defined in Standard AIJDID393. -r e o *- -+-% Provided by IHSNot for ResaleNo reproduction or networking permitted
13、 without license from IHS-,-,-MIL-C-ZCOL4 47 9999906 O275545 7-u ialcc-25014( WAF) tael parts.- AU non-corrosion resistart steel parts shall be Selection of materials.- cadxiwq plated in accordance with Specification +W4l6. %ecifications and standards for all nriterids, parta, arid Governent certifi
14、cation and approval of processes and t.,cluj.pmenS, wiiicti are not specifically designated herein and which are necessary for tho axocution of this specificatton shall be selected in accordance with AXA IIulZotiri No. 1yrit as approved by the procuring activity. Staridarrl parh-. Standard parts (KS
15、, AN, or JAJ) shall be used Comercial utility parts such as screws, bolts, nuts, In cases where materials i3reads.- Mactiine screw threads shall conform to Specification 1:1LS-77emal or internal threaded parts shall be securely locked AriLmlar rnlsa1ignment.- The coupling shall be capible of being .
16、;taled Kith a naxiraum tubing or fitting end hstallation misalignment of 3 degrees in any direction between end centerlines. Flexure,- The coupling shall provide for one degree flexure Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5- bIIGC-25014( U
17、SAF) 3.5.4 Permanent deformation,- Ins tallation of the coupling on tubing or fitting ends under conditions svecified herein shall not produce a Demanent deformation of the tubing or fitting. 3. 5.5 Pressure and tempwature,-. “ho coupling shall perform satis- factorily and shall not leak when subjec
18、ted to the following conditions: TASLE I - : Fuel : 45 to + lho : 125 : 250 : 375 : . 3.5.5.1 Pressure dro?.- Pressure drop through the installed coupling shall not exceed the drop through a run of straight. tubing of a size for which thecoupling is designed equal to a length of five times the overa
19、ll coupling 1 eng t h. 3.5.6 Tubing,- The coupling shall be capable of joining tubing of the sizes and dimensions specified on standards AIiDlOlG4 and AIID10106. Seal.- The coupling seal shall be readily replaceable with no 3.5.7 - damage and a minimum of disturbance or displacement of the installed
20、 tubing or fitting. “Off rings, if used, shall conform to Specification KIL-P-5315. used in the coupling shall be in accordance vrith Specification LiILcE-c$55. The seal shall not be subjected to end loads of tubing under pressure. STynthetic rubber 3.5-g Assembly.- The coupljng design shall be such
21、 as to allow ease . of assembly and disassenbly on tubing OP fitting ends in close and confined spaces such as are normally encountered in aircraft installations. 3.6 Performance. - The coupling shall satisfy the performance require- ments specified in Section 14, when subjected to the applicable te
22、sts. 3.6.1 Position.- The flexible connector assemoly shall operate satis- factorily in any position (attitude) in the aircraft power plant fuel systm. The coupyqg shall function satisfactorily with fuel flow in either direction through the coupling. 1 3.7 Interchangeability.- All parts having the s
23、ame manufacturers . part number shall be directly and completely interchangeable with each other with respect to installation and performance. numbers shall be governed by the drawing number requirements of IdILLb502lIL-H=3l$, Types I and III. L3.5 !Lubing or fitting end nal1thicknesses.- The tubing
24、 or fitting ends used in testing the coupling shall have wall thicknesses of the minimum standard values specified in Standards AND1010 and AND10106 up to and including 3 inch tubing diameter, From 3 1/2 inches to 5 inch diameters inclusive the maximum wall thickness shall be O.O!% inch, and fmm 5 1
25、/2 to t3 inch diameters inclusive the maxtmun wall thickness shall be 0,065 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-2501Li Li7 W 7977706 0275550 O -* -9- 4.4 Test nethods.- The following tests shall be conducted in the o r er spe
26、cified, 4.LL Fuel resistance test,- 4.bl.l High tenperature fuel aging, :r!IL-H-31%, Typ e III,- MIL-11-3136, !Iype III test fluid shall be circulated through the test assembly at the operat- I hg pressure specified in 3.5.5. The fluid temperature shall be maintained at 16QF for 72 hours. be conduct
27、ed in accordance with 4.3.2. pon completion, the couplhg shall be subjected to the proof pressure as specified in 3.5.5 holding the pressure for During the final f3 hours of this test, vibration shall a minimum of one minute, 4. LI 2 High temperature fuel aging, MIL-I-3l$, w-. NILA-3136, I test flui
28、d shall be circulated for 72 hours while at 1 F and 125 psi. During the final 8 hours of this test, the assembly shal be vibrated in accordance with 4.3.2, test at 250 psi, holding thv pressure for a minimum of one minute. Upon completion of this test, cease vibration and proof 4.4.1.3 Low temperatu
29、re, b!ILII-5136, Type 1.- MIGH-3136, Type I test fluid shall be circulated for (2 hours, while at 125 psi and -65 F. the final t3 hours of tllis test, the assembly shall be vibrated in accordance with 4.3.2, pon completion of this test, cease vibration and proof test at 250 psi, holding the pressure
30、 for a minhum of one minute. During Upon completion of the low temperature test, F.- 4.4.1.L. t!ie assembly sha The low temperature test, Paragraph 4.4.1.3, shall be repeated upon campletion be drained and placed in an air oven for iflad in .- the 6mct or purchase order and shall be furnished withou
31、t hcreas-jng th . cost of the contract or order. P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-ZSOLLi Li7 779770b 0275553 2 -10- L!IL-C-SSO( WAF) 5. PWATION FOR DELIVERX 5.1 to Specifications JAfM?-1x), PPP-i3-676 or Jhi-P-lO8 a 542.1 Packb
32、g - domestic shipment.- Merior containers shall con- fom t SpecLfications ffld-B-571, M4-B-521, LLG contracts for equipnierit, whether procured directly by the Government or through another contractor, require that ail drawings sub- dtted, be in accordance with the requirements of specification l.:G
33、E+O;?s4 Their use is lirdted to 1. j 2u&ification,- In the procurement of products requiring qualffication, tho right is reserved to reject bids on products that have not been subjected to the required tests and found satisfactory for inclusion oii the &mlifiad Products List, Dio attention of suppli
34、ers is called to this rwpiirorwnt and manufacturers are urged ta arrange to have the produds that timy proposa to offer to the Federal Governient testad for qualification in order that they may be eligible to be awarded contracts or orders for the pro- ducts covered by this specification. Informatio
35、n pertaining to qualification ci piwducta covered by ths specification may be obtahed from the Conmiander, irizht Rir Developnent Center, Wright-Patterson Air Force Base, Ohio, Attention: L Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
