1、MIL-N-87963 (USAFI 27 March 1979 SUPERSEDING AF 82-PD368 25 March 1976 MILITARY SPECIFICATION NOZZLE: FUEL, AIRCRAFT, OVERWING: TYPE MD-3 This specification is approved for use by HQ AFLC CASO/LODS, Department of the Air Force, and is available for use by all Debartments and Agencies of the Departme
2、nt of Defense, 1, SCOPE 1.1 This specification covers one kind of shockproof, overwing, aircraft, fuel servicing nozzle, designated me MD-3. 2 APPLICABLE DOCUMENTS * 2,l The following documents of the issue in effect on date of invitation for bids or request for pronosal form a part of the specifica
3、tion to the extent specified herein, SPECIFICATIONS Federal Thinner, Paint, Volatile Spirits (Petroleum-Snirits 1 MIL-H-775 Hose, Rubber, Plastic, Fabric, (Including Tubink) : And Fittings Nozzles and Strainers,. Packaging of (For Bolted Steel Tanks) Aluminum Alloys Corrosion Inhibiting High-Tempera
4、ture mel Resistant MIL-G-O Gasket Material, Synthetic Rubber MIL-A-8625 Anodic Coatings, For Aluminum And MIL-L-46010 ,Lubricant, Solid Film, Heat Cured, MIL-R-25897 Rubber, Fluorocarbon Elastomer , MILI-27686 . Inhibitor, Fuel System Icing STANDARDS Military MIL-STD-130 Identification Markings of U
5、S Military Property FSC 4930 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILrSTD-266 Impregnation of Porous, Nonferrous Metal MIL-STD-810 Environmental Test Method MIL-STD-831 Test ReDorts, Preparation of MS2538h . Electrostatic Discharger, Jumwr
6、, Fuel Castings Nozzle to Aircraft (Copies of apecifications, standards, drawings, and publications required by aupplicrs in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer,) 2,2 m, The following document forms a
7、 part of this specifi- cation to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proyosal shall apply, NATIONAL BUREAU OF STANDARDS Handbook H28 Screw Thread Standards For Federal Services (Application for copies should be ad
8、dressed to the Superintendent of Documents, Government Printing Office, Washington DC 20402. ) 3,l ducti.o cast alunimm alloy 356 and 300 series stainless steels. Nozzle spout shall he fabricated from 6066 aluminum. Strainer joining material may be any metaIlic solder or brazing material that does n
9、ot contain either magnesium or copper except as impurities. Strainer, valve stem and valve spring shall be fabricated from 300 series stainless steel. Metals not normally in contact with the dis?ensed fuel shall be either aluminum alloy or stainless stebl except that small mete.1 parts (bolts, screw
10、s, nuts, washers, et cetera) shall be either cadmium or zinc plated steel. This document innoses no-restrictions on the electrostatic discharger. 3.3.2 Metal treatment. All aluminum alloy parta shall be anodized in accord- ance with MIL-A-8625, Class I, either Type I or Type II. All aluminum casting
11、 that are subjected to fluid pressure in service shall be impregnated in accord- ance with MIL-STD-266. All thread surfaces on aluminum alloy parts shall be treated with solid film lubricant shall be in accordance with the applicable provisions of the Appendix to b,-46010. 3.3.3 Nonmetals. Internal
12、elastomers, gaskets and seals, including stem seals, shall be fabricated from either rubber conforming to MIL-R-25897, Type and Class as applicable, or commercial grade polytetra-fluoroethylene, or commercirtl grade asbestos impregnated with polytetra-fluoroethylene. Nozzle snout dust cap shall be m
13、olded from rubber conforming to MIL-G-o, Type II. Filler neck protector bumper shall be of any commercial, aromatic fuel resistant, elastromeric material. 3.4 Design. The nozzle shall be suitable for open-flow dispensing of aviation gasoline, jet fuel and water-alcohol mixture (JUX) to aircraft fuel
14、 tanks. The nozzle shall be of the balanced-pressure self-closing type and shall be designed 80 that the force required to oDen the valve and control the flow remains practically constant independent of the flow rate, The nozzle shall not include any automatic shutoff device nor any means of locking
15、 in open position. The nozzle shall conform to Figure I in dimensions and general configuration. 3.5 Construction. The.nozzle shall be constructed so that no parts will work loose in service. It shall withstand the strains, Jars, vibrations, and other conditions incident to shipping, storage, instal
16、lation, and service. The nozzle shall be constructed so that adjustments and repairs can be made easily by personnel of operating units and overhaul bases without the use of special tools. 3.6 Performance. The nozzle shall have the following performance character- istics when tested as specified her
17、ein. 3.6.1 Ca acit The nozzle flow cayacity shall be not less than 135 gailons per minute v gpm) at a nozzle inlet pressure not greater than 25 pounds per square inch gage (psig). 3.6.2 Closin The nozzle shall be self closing and shall shut off fuel flow within 7“ 1 5 seconds after release of the op
18、erating lever. - 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-87963 Y9 m 9999906 0258Y27 Y m MIL-N-87963 (USAF) JUMPER,. NOZZLE-TOWAIRCRAFT, MS25384-5 7 WASHERS “t a 9 h DUST CAP t-112 INCH SPOUT ?LIFTING EYE IMIN lm= NOZZLE INLET 5 2-INCH
19、 FEMALE NPT - 12 MAX- STUD MS25384-3 LEVER 19 MAX- DIMENSIONS IN INCHES T0LERANCE:FRACTIONS f 1/8 FUEL, NOZZLE, TYPE MD-3 FIGURE I 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-87963 (USAF) MIL-N-87963 (SAF) 3.6.3 Surge, Surge pressure due
20、to release of operating lever shall not exceed 50 pounds per square inch (psi). 3.6.4 Leakage, The nozzle shall not leak or weep when tested as specified herein . 3.6.5 Lever pull, Lever pull force to operate the nozzle shall not exceed - 15 pounds. 3.6.6 iImpact, The nozzle shall withstand multiple
21、 12 foot drops onto a concrete surface. 3.6.7 Environmental, The nozzle shall meet the requirements syecified herein during and after exposure to the following: (1) Temperature: Operating, -65OF to 125F; storage, -65OF to 150F. (2) Salt spray: Exposure to salt-laden atmosphere, 3.7.1 m. The nozzle b
22、ody shall conform to Figure 1 in dimensions and general configuration, with a 90 degree angle between centerlines of inlet: lvid outlet connections. The nozzle body shall be fabricated separate from the guardhandle. The outlet connection of the nozzle body shall conform to Figure 2, Wear hgs of wear
23、 rings (or both lugs and rings, if necessary) shall be provided to prevent abrasion of vital parts when the nozzle is dragged. The wall of the nozzle body .shall be not less than 3/16 inch thick. After heat treatment and completion of all machiningi;operations, the body shall be suc- cessively anodi
24、zed, impregnated, and then treated with solid-film lubricant on the threated surfaces; all of these treatments being performed in accordance With 3.3.2. 3.7.2 Valve. The nozzle valve shall be designed and constructed to shut off the fuel flow within not more than 1.5 second after release of the oper
25、ating lever and without surge pressure in excess of 50 psi, The valve closing time shall be fixed by design; i.e., no adjustable device is permitted, “he valve stem shall be furnished with an adjustable packing gland or a readily replace- able O-ring seal or seals to prevent leakage. 3.7.3 Handle an
26、d age-rating lever. The nozzle shall be equipped with a handle securely attached to the nozzle body in *he general configuration shown in Figure 1. The handle shall be readily removable and replaceable by means of ordinary tools, The handle shall include a 3/4-inch diameter lifting eye in the genera
27、l location shown in Figure 1; this eye shall be an integral part of the handle and shall not protrude beyond the main contour of the handle. The handle shall be equipped with an operating lever that actuates the nozzle valve; release of the lever shall cause closure -f the valve. The handle shul fun
28、c- tion a8 a lever guard and shall enclose the lever completely in such a manner as to protect the lever from damage when the nozzle is dropped. The handle shall not restrict or interfere with free motion of the lever in its normal plane of motion; no notches or any other locking-or arresting device
29、 shall be 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BODY O UTLET DETAIL F i DIA 1/8 THREAD ROOT 1-1/2 STD STRAIGHT PlPE THD (NPSM) FREE FITTING ALUMINUM THRUST RING ID 1.487 i 0.012 W 0.103 f 0.003 DIMENSIONS IN INCHES TOLERANCE: FRACTIONS f
30、1/32 NOZZLE BODY OUTLET AND ASSEMBLY DETAIL FIGURE 2 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-87763 47 7777906 0258430 LI MIL-N-87963 (USAF) permitted. “he lever and pivoting arrangement shall be designed so that a minimum of side thru
31、st is transmitted to the valve stem seal when the lever is operated. Provision shall be made to ensure that the lever will operate pro- perly after normal wear of the valve Barts has occurred. The contour and position of the handle and lever shall be designed for easy operation wdfh bare, gloved, or
32、 mittened hand and for holding in either throttled or full-open posi- tion without undue fatigue of the operator. 3.7.4 Spout. The nozzle shall be provided with a spout conforming to Figure 3. The spout shall be provided with a knurled surface for hand-tighting into the nozzle body. The spout shall
33、be anodized and the threaded surfaces treated with solid-film lubricant in accordance with 3.3.2. Spout dimensions shall conform strictly to the dimensions and tolerances shown in Figure 3. 3.7.5 Strainerp and strainer seals. Each nozzle shall he provided a strainer, Strainers shall conform to the d
34、imensions shown in Figure 4 and to the material requirements of 3.3.1. Each strainer shall consist of an inner 100-mesh screen, an outer 6-mesh screen, and. a ring fabricated and assembled in strict conformance to the dimensional tolerances shown in Figure 4. The screens shall be joined securely to
35、the ring by soldering, brazing, spot welding, and/or heliarc welding in such a manner that.all fluid flow is directed through the 100-mesh screen without any bypassing. Joining method and technique shall be selected to insure mechmical integrity and to minimize the amount of screen area blocked by j
36、oining material. Two standard size O-rings and one metal back- up ring shall be provided with each strainer and shall be installed as show in Figure 2 to prevent fluid leakage between the spout and body and bynassing of the strainer. 3.7.6 Filler neck2rotector. The nozzle shall be provided with a re
37、movable, adjustable protector for aircraft filler necks, sized to fit the nozzle spout. The protector shall conform to Figure 5 and shall orovide a rest for the nozzle during the refueling of thinwing aircraft in order to prevent wing-tank internal damage and wing skin damage. The filler neck protec
38、tor shall not be displaced from a selected position on the nozzle spout when subjected to a sustained force of 25 pounds plus dead weight of the nozzle, 3.7.7 Dust cap. Each nozzle shall be provided with a dust cap corresponding in size to. the spout. “he dust cap shall consist of a close-fitting, r
39、emovable, molded rubber cap at least 3 inches in length conforming to the general con- figuration shown in Figure 1. Dust cap shall be molded from rubber conforming to 11086, Type II. The cap shall be provided with noncontinuous internal circular corrugations to provide the necessary retentionton th
40、e end of the spout. The cap shall be fixed securely on the jumper (ground connections) cable at the location shown in Figure 1; the cap cable attachment and cap shall be of sufficient strength that the cap can be removed by pulling on the cable. The end of the cap shall be provided with a small orif
41、ice for breaking of vacuum within the cap caused by removal of cap from spout. 3.7.8 Electrpstatic discharger. The nozzle shall be furnished with a elec- trostatic. discharger jumyer securely attached to the nozzle handle and dust cap in conformance with Figure 1. The electrostatic discharger assemb
42、ly shall conform to MS25384-5 except that the cable length between the stud and Flug shall be not less than 54 inches. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-879b3 q4 W-949990b OZ58431 b W MIL-N-87963 (USAF) 1-1/2 STD STRAIGHT PIPE THD
43、 (NPSM) FREE-FITTING AND SMOOTH SPOUT MATERIAL: 6061-T6 ALUMINUM ROUND PIPE, SCHEDULE 40 TOLERANCES: FRACTIONS 2 I /32 BREAK-SHARP EDGES DIMENSIONS IN INCHES: DEGREES - Io 1. NOZZLE SPOUT FIGURE 3 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SQU
44、ARE-MESH WIRE CLOTh, STANDARD MARKET GRADE: INNER: 100 X 100 WITH 0.0045 DIA WIRE OUTER: 6x6 WITH 0.035 DIA WIRE DIMENSIONS IN INCHES TOLERANCE: FRACTIONS f 1/16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MOLDED OR REMOVABLE RUBBER BUMPER THUMBS
45、CREW VIEW A-A DIMENSIONS IN INCHES TOLERANCE: FRACTIONS .f 118 AIRCRAFT FILLER NECK PROTECTOR FIGURE 5 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-87763 47 7777706 0258q34 L . MIT,-N-8 7 9 6 3 (USAI) 3.8 Weight. The weight of each comple
46、te nozzle, including all components list all nozzles tested shall be submitted to the procur- in8 activity, 4a3b3 m. After completion of preproduction testinR, the contractor shall submit to the procuring activity a test report prepared in accordance with MLpm for a minimum of 5 minutes while mainta
47、ininp: the fluid temperature between 70 and 9O0F. Pwnpinp. shall he continued as long 8s necpssary to estab- lish steady-state conditions. At this time, the fluid flow rate, nressure, and temperature shall be recorded and reportad, Additional tests shs.11 be made in a eimilar manner at flow ratas of
48、 approximately 40, 80, and 200 Gm, and the relationship shall he renorted in the form of a flow-messure curve showinq the fluid temperature corresnonding to each data noint, No correction for fluid properties shall be apnlied to the flow-pressure data; however, the test fluid density and kinematic v
49、iscosity at the average test temnerature shall be reported. The nozzle inlet pressura shall not be greatr than 25 psig at a flow rate of 135 mm, There shall be no leakage of the nozzle durina this test e b.54 -* With the nozzle mounted as specified in 4.4.3, the system shall be adjusted to furnish a static pressure of 50 nsig at the nozzle inlet with tho nozzle val
