1、/ MIL-T-81838 15 777770b 0205208 2 -. E-O+-Il MIL-T-81838 (AS) 30 November 1971 MILITARY SPECIFICATION TANK, FUEL, AIRCRAFT, AUXILIARY EXTERNAL 300 GALLON, TYPE AERO-ID This specification has been approved by the Naval Air Systems Command, Department of the Navy 1. SCOPE 1.1 This specification estab
2、lishes the requirements for the manufac- ture, assembly and test of the type AERO-ID 300 gallon external fuel tank. 2. APPLICABLE DOCUMENTS 2.1 for bids or rauest for proposal, form a part of the specification to the extent speci- fied herein. The foliowing documents of the issue in effect on date o
3、f invitation SPECIFICATIONS Federal . PPP-B-636 P-D -6 80 TT -S- 73 5 Military L MIL-P-116 MIL-D-1000 MIL-T-5021 MIL-(3-5501 MIL- C - 5 541 Boxes Fiberboard Dry Cleaning Solvent Standard Test Fluid Hydrocarbon Preservation, Method of Drawings, Engineering and Associated Lists Tests, Aircraft and Mis
4、sile Welding Opera- tor, Qualification Closure, Tubing Protective Chemicals Films and Chemical Film Mate- rials for Aluminum and Aluminum Alloys Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-BLB3 15 9999906 0205209 4 i MIL-Ta1838 (AS) SPECIFI
5、CATIONS Military (Cont) MIL-T-5624 MIL-C-6529 MIL-W-6858 MIL-1-68 66 MIL-V- 71 73 MIL- F- 71 79 MIL-P-7962 MIL-C - 8 51 4 MIL-W-8604 1 MIL-F-8615 MIL-D- 8634 MIL-c-943 7 MIL-T-18847 MIL-L-1953 7 Turbine Fuel, Aviation, Grades JP-4 and JP-5 Corrosion-Preventative Compound, Air- craft Engine Welding,
6、Resistance, Aluminum, Magne- sium Non-Hardening Steel or Alloy, Nickel Alloys, Heat Resisting Alloys and Titanium Alloy, Spot and Seam Inspection, Penetrant Method of Inspection, Penetration, Method of Vibration Test of Fuel, Oil and Misc., Tanks, Process for Finishes and Coatings; General Specifica
7、- tion for Protection of Aerospace Weapons Systems, Structures and Parts Primer coating, Cellulose-Nitrate Modified Alkalyd Type, Corrosion-Inhibiting, Fast Drying (For Spray application over Pretreat- ment coating) Coating Compound, Metal Pretreatment Welding of Aluminum Alloys, Process for Fuel Sy
8、stem Components; General Specifica- tion for Decalcomanias, Aircraft, for Use on Exterior Surfaces Crate, Wood Open, Fuel External Assembled Tank, Fuel, Aircraft, Auxiliary, External, Design and Installation of Lacquer, Acrylic-Nitrocellulose Gloss 2 Provided by IHSNot for ResaleNo reproduction or n
9、etworking permitted without license from IHS-,-,-. NIL-T-8138 35 = 7779706 0205230 O W MIL-T-81838 (AS) SPECIFICATIONS Military (Cont) MIL-P-23377 MIL-C-81773 STANDARDS Federal FED-STD-141 Military MIL-STD- 105 MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-453 MIL-STD-794 DRAWINGS NAVAIR Primer Coatin
10、g, Epoxy Polyamide, Chemical and Solvent Resistant Coating, Polyurethane, Aliphatic, Weather Resistant Paint, Varnish, Lacquer and Related Materials, Methods of inspection, Sampling and Testing Sampling Procedure and Table for Sampling by Attributes Marking for Shipment Identification Marking of U.
11、S. Military Property Specifications and Standards, Order of Precedence for the Selection of inspection radiographic Parts and Equipment, Procedures for Packaging and Packing of 244As100 Aero-1D 300 Gallon Fuel Tank (When requesting applicable documents, refer to both title and number. Copies of uncl
12、assified documents may be obtained from the Commanding Officer, Naval Publications and Forms Center, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. Requests for copies of classified documents should be addressed to the Naval Publications and Forms Center, via the cognizant Government represent
13、ative. ) 3. REQUIREMENTS 3.1 First article - The fuel tanks furnished under this specification shall be a product which has been inspected and has passed the first article inspec- tions specified herein. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
14、,-,-MIL-T- 818% (AS) 3.2 Selection of specifications and standards - Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD-143. 3.3 Finish - - 3.3.1 Aluminum alloy surface treatment - The internal surfaces of the tank sh
15、all be treated in accordance with Type I of MIL-F-7179. 3.3.1.1 External finish - All external surfaces shall be painted. Paint shall consist of MIL-P-23377 epoxy primer (O. 0006 to O. O009 inches dry film thickness) topcoated with MIL-C-81773 aliphatic polyurethane, Color #178 75 (Top- coat dry fil
16、m thickness of O. 0010 to O. 0015 inches) after MIL-C-5541 surface treat- ment, to obtain adequate paint adhesion. 3.4 Welding - Fusion welding shall be in accordance with MIL-W- 8604. Resistance, spot and seam welding shall be in accordance with MIL-W-6858. 3.4.1 Welders certification - Welding sha
17、ll be performed by personnel certified in accordance with MIL-T-5021. 3.4.2 X-Ray inspection - X-Ray inspection shall be performed in accord- ance with MIL-STD-453. 3.4.3 Dye penetrant inspection - A dye penetrant inspection shall be performed in accordance with MIL-1-6866. 3.5 Identification of pro
18、duct - Each part or assembly shall be identified in accordance with MIL-STD-130. 3.5.1 Exterior decalcomania - A decalcomania shall be furnished that conforms to MIL-D-8634. The decalcomania shall be located on the tank exterior near the filler unit and shall be legibly filled with the following inf
19、ormation: TANK, FUEL, AIRCRAFT, AUXILIARY EXTERNAL Type Designation - Aero ID Federal Stock Number Tank Material Capacity (in U. S. Gallons) Weight Empty (Excluding Tail Cone Assembly) Manufacturers Part No. Manufacturers Serial No. 4 Provided by IHSNot for ResaleNo reproduction or networking permit
20、ted without license from IHS-,-,-MIL-T-1838 15 m 9777706 0205212 LI W MIL-Ta1838 (AS) Contract or Order No. Manufacturers Name or Trademark Tech. Dir. Compliance (Contractor to leave blank space for future service use) U.S. Property 3.5.2 Internal nameplate - A metal nameplate shall be securely affi
21、xed to an internal structural component. The information to be included on the name- plate shall be identical to that specified in paragraph 3.5.1 above. The nameplate shall be visible and accessible through one of the access doors. 3.6 Tail assemblies - The tank shall have provision for either a bo
22、b- tail assembly or a long tail cone (see 6.4). 3.6.1 Bob-tail assembly - The bob-tail assembly shall be smoothly contoured and without fins. 3.6.2 Long tail cone assembly - The long tail cone assembly shall have provisions for either O, 2 or 4 fins. Provisions shall also permit mounting the fins ei
23、ther vertically and horizontally, or at 45 degrees from the vertical. (See 6.4. ) 3.7 Weight - The empty weight of the tank with two fins installed on the long tail shall not exceed 200 pounds. 3.8 Float switch actuation - The tank float switch shall be actuated at the following levels: TANK ATTITUD
24、E CAPACITY GALLONS a. 6“ nose up 285. O to 291. O b. 115 nose up 288.0 to 294.0 c. 1“ 20 nose down 277. O to 283. O 1 3.9 Aerodynamic smoothness - Variation from the nominal contour smoothness of the tank as shown on the applicable drawings shall not exceed the dimensions shown herein when measured
25、with a spline over the distance of six (6) inches in any direction including weld bead height. The nominal dimension varia- tion for the first third of the tahk shall be f. 032 inches and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-T-L3 35 m
26、777770b 0205237 3 m TABLE I LETTER - A B C D E F G H I J K L M N O P Q R S T. U PART NAME Pressure fueling shutoff valve Pilot Line Solenoid Valve - normally closed Forward fuel connection Air inlet connection Aft fuel connection Fuel quantity gage wires Float switch wires Float Switch Conduit Topsi
27、de filler cap Air line Vent ,valve Vent line Vent exit Fuel Quantity gage Drain valve Manual shutoff valve Air regulator - 3 way Pressure Gage Manual shutoff valve 4.6.2.2 Test fluids - Any of the following test fluids may be used: (a) Stoddard Solvent, per P-D-680 (b) TT-S-735, Type II fluid (c) JP
28、-4 Fuel (MIL-T-5624) (d) JP-5 Fuel (MIL-T-5624) 4.6.2.3 he following procedure is applicable to the 300 gallon fuel tank with the tank installed in a fixture to hold 5 1/2O k2“ nose-up. 4.6.2.3.1 Provide a flow to valve “Alf of 50 to 60 gpm and a pressure of 10 to 30 psi. 4.6.2.3.2 Check the followi
29、ng points: (a) ?RT1 closed (b) fWf closed (c) KK“ closed (d) “Off open (e) lQf7 closed (f) TJ71 open 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-83838 35 W 7777706 0205238 5 W FUNCTIONAL TEST SETUP 11 , Provided by IHSNot for ResaleNo re
30、production or networking permitted without license from IHS-,-,-MIL-T-L3 35 W 997970b 0205239 7 W MIL-T- 81838(AS) 4. 6.2.3.3 Close switch, ffCff will open allowing fuel to flow through “A“ and IDTf to tank. 4.6.2.3.4 Observe f7Tff, Pressure will not exceed 1 psi. 4.6.2.3.5 When tank is full, rTf wi
31、ll open, closing “C“ which in turn will close tfAff, shutting off fuel flow. 4.6.2.3.6 Check ifoff, 10 drops per minite allowable fluid leakage. 4.6.2.3.7 Open ftQtt, allow approximately 1 pint to drain, close, wipe dry and check for leakage, none being allowable. 4.6.2.3.8 Clos e W ?. 4.6.2.3.9 Set
32、 Wff at 3,7,10,15 and 20 psi successively holding each pressure for at least one (1) minute. Check ftKfl, ffHff, “Gff, IfDff, “Eff, “F“ and “Qff for fluid leakage at each pressure - none allowed. “Off may leak in excess of 10 drops per minute at these pressures; however, leakage at any pressure shal
33、l not exceed 10 cc per minute. 4.6.2,3.10 During the previously listed checks, there will be a contin- uous bleed of air out of “0“ which comes from the O, 033 inch diameter thermal relief orifice incorporated in ffMff. 4.6.2.3.11 Set 93“ at 10 psi, open rVrt, and fuel will flow out - t P LL 3 t FIG
34、URE 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-LOAD DISTRIBUTION: AERO-ID 300 GALLON FUEL TANK “# Q 0- (.? I- CONDITION 58.5 GAL. 111: # A 8, I O o LL 3 I FIGURE 5 20 , Provided by IHSNot for ResaleNo reproduction or networking permitted witho
35、ut license from IHS-,-,- MIL-T-L3 15 W 7977706 0205228 84 I oc LOAD DISTRIBUTION: AERO-ID 300 GALLON FUEL TANK CONDITION Ip: 196 GAL. HZO Cu FIGURE 6 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-8L838 15 3979906 0205223 T m MIL-T-81838 (A
36、S) (b) Unless otherwise noted, oxide folds and suckbacks are acceptable if the thickness in the area is not less than the minimum sheet or plate thickness allowed in the material specification and/or the drawing tolerance for machined or formed sheets or parts, whichever is applicable, (c) Discontin
37、uities exposed to the surface are acceptable providing the linear dimension and total area values do not exceed the corres- ponding radiographic limits specified for all internal discontinuities. 4.6.9.3.3 internal defects - (Radiographic Requirements) The following internal defects are rejectable:
38、(a) metal. (b) lid ted as follows : exceed a linear dimension Cracks are not acceptable in the weld or adjacent base Porosity, voids and oxide inclusion defects shall be (1) Maximum Pore Size: Unconnected voids shall not greater than 50% of the weld bead thickness or shall not exceed a diameter of ,
39、050 (1/20) inches, whichever is smaller. (2) The summation of all unconnected void areas in any linear inch of weld shall not exceed 7% of an area equal to (1 in. X T) sq. in. Aligned porosity shall not exceed 3.5% of an area equal to (1 in. X T) sq. in. (3) Porosity pores smaller than O. 00008 sq.
40、in. in area are considered non-detrimental and need not be evaluated. (4) Weld metal radiograph images which appear to have pores that overlap, but each pore can be differentiated from the outer by Radiographic Triangulation, shall be evaluated as separate pores. 4.6.9.3.4 Stringer discontinuiQ - A
41、stringer discontinuity is defined, for the purpose of X-Ray interpretation, as an oxide stringer, or a series of stringers in a linear distribution when the ratio of the major dimension to the minor dimension of an individual discontinuity is 5:l or greater. The stringer discontinuity shall be consi
42、dered a single stringer where the adjacent discontinuities are not separated by a length equal to or greater than 35% of “T“. A stringer discontinuity is permissible if: The summation of ail connected or aligned stringers do not exceed a total area of O. 060 (60/1000) sq. in. in any 6. O inch length
43、 of weld and occurs in the weld bead reinforcement area (root and face). 22 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-81838 15 W 9779706 0205230 b W 4.6.9.3.5 undercutting - Undercutting shall b-e cause for rejection if it is in excess
44、of 1/10 T in depth. Undercutting of any depth less than 3/10 T shall not exceed one inch on weld length. lT1f is the thickness of the parent metal adjacent to the undercut. 4.6.10 Weight - The tank shall be checked for conformance with the requirements of paragraph 3.7 herein. 4.6.11 Float switch ac
45、tuation - The tank shall be checked with the requirements of paragraph 3.8 herein. 4.6. 12 Contour - The tank shall be checked for conformance with the requirements of paragraph 3.9 herein. 4. 6.13 Pressure fueling - The tank shall be checked for conformance with the requirements of paragraph 3.11 h
46、erein. 5. PREPARATION FOR DELIVERY 5.1 during shipment and storage by the application of Type III mixture conforming to MIL-(2-6529. Particular care shall be exercised to insure complete coverage of all internal surfaces and to insure adequate drainage of the excess compound. Preservation - The tank
47、s shall be protected internally 5.1.1 Fittings - All fittings shall be preserved in accordance with Method 3(a) MIL-P-116 and securely packaged in an interior paperboard corru- gated fiberboard container conforming to PPP-B-636, Type I, Class 2. The packaged fittings shall be secured to the interior
48、 face of the tank shipping container. 5.1.2 Closures - The tank interior shall be protected against the entrance of dirt or other foreign material by sealing the exterior openings in accordance with MIE-C-5501. During shipment and storage,. the tank shall be vented through the fuel line to compensat
49、e for thermal changes. 5.2 Packing - Each assembled tank and the accessories to accompany the tank, as defined in the contract or order, shall be packed in an open crate conforming to MIL-C-9437. The boxes containing the accessories shall be so distributed as to insure that the center of balance of the crate is approxi- mately
