1、MIL-C-27505B(UTAF) 15 June 1967 Superseding MIL-C-27505A(USAF) 2 July 1963 MI :LIT ARY SPECIFICATIOI d CARTRIDGE, ENGINE STARTER MXU-4A/A 1. SCOPE 1.1 This specification covers the requirements for one type of solid propellant engine- starter cartridge, designated MXU-4A/A. 2. APPLICABLE DOCUMENTS 2
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 extent specified herein: SPECIFICATIONS Federal PPP-B-636 PPP-(3-96 Military MIL-P-116 MIL-T-5021 MIL-T-6866 MIL-S-27266 STANDARDS Military MTL-STD-100
3、MIL-STD-105 MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-210 Box, Fiberboard Can, Metal, 28 Gage and Lighter Preservation, Methods of Tests, Aircraft and Missile Welding Operators, Qualification Inspection, Penetrant Method of Starter, Engine, Cartridge and Pneumatic, Shaft Drive, General Specificati
4、on for Engineering Drawing Practices Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage :Identification Marking of U. S. Military Property Specifications and Standards, Order of Precedence for the Selection of Climatic Extremes for Military Ecpipment FSC 137
5、7 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-49-CFR 71-78 Interstate Commerce Commission Regulations For Transportation of Explosives and Other D
6、angerous Articles (The Interstate Commerce Commission Regulations are now a part of the Code of Federal Regulations (1949) Edition - Revised (1950) , available from the Superintendent of Documents, Government Printing Office, Washington 25, D. C. Orders for the above publication should cite “49 CFR
7、71-78 Rev 1950.”) 3. REQUIREMENTS 3.1 Prewoduction. This specification makes provisions for preproduction testing, 3.2 Components. Normally, the cartridge assembly shall consist of the following parts: a, Solid propellant b. Case c. Igniter assembly d. Weatherseal e. Screen, 3.3 Model specification.
8、 A cartridge model specification conforming to the format outlined in the appendix of this specification shall be prepared by the contractor and three copies submitted to the procuring activity for approval prior to preproduction testing. 3.3.1 Definitions and symbols. Terms, their definitions, and
9、symbols used in the model specification shall be in accordance with 6.3 and AF Specification Bulletin 508. In case of conflict between the definitions of AF Specification Bulletin.508 and this specification, this specification shall govern, 3.3.2 Design criteria. The design criteria for the cartridg
10、e performance shall be included in the model specification in the format of table I and shall not exceed the limits of table I. 3.3.3 Design drawings. Design drawings constitute a part of the model specification and shall be maintained and updated as controlled documents, 3.3.4 Model, A full scale c
11、utaway model of the cartridge shall be submitted. 3.4 Selection of specifications and standards. Specifications and standards for nec- essary commodities and services not specified herein shall be selected in accordance with MIL-STD-143. 3 Provided by IHSNot for ResaleNo reproduction or networking p
12、ermitted without license from IHS-,-,-TABLE I Design Performance Criteria at Sea Level Parameter 1. Ignition delay (td), sec 2. Ignition pressure rise rate after first indica- tion of pressure, psig 3. Maximum pressure during ignition (Pi), psig 4. Maximum pressure following ignition (ma,)/ Psig 11
13、5. Minimum pressure following ignition cycle through tailoff (Pmin), psig 6. AJerage chamber pressure Pa)/ Psig 21 (8 Pdt), psig-sec X 10-4 7. Pressure-Time- integral 8. Action time (ta), sec Temp (“F) _I“-s -65 +160 -65 +I60 -65 +160 -65 +160 -65 +160 -65 +160 -65 +160 -65 +59 + 160 -65 +59 +160 j
14、i I - 1/ End of ignition phase shall be defined in the model specification. - 2/ To be determined as follows: Determine area under the pressure-time curve encompassed by actior timel Divide the area by the burn time to obtain average pressure, P, in pounds per square inch gage. 3_/ To be given in mo
15、del specification not to exceed 1550 psig. i/ Average pressure to be given in model specification. Allowable range not to exceed 150 psig at-65“F and 200 psig at +16OoF. 5/ Allowable range not to exceed 1000 psig-sec. Limit of Range 0.60 max 0.25 max Given on figure 3 Given on figure 3 _. “. 3/ i550
16、 850 1400 550 1050 650 4/Min. 1350 i/ Max. 1.60 b4ax. L/ 1.60 Max. 2, To be given in the model specification 18-22 13-19 11-14 ._ - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5 Materials 3.5.1 Fungus-proof materials. Materials that are nutrien
17、ts for fungi shall not be used where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated with a suitable fungicidal agent acceptable to the procuring activiw. 3.5.2 Metals. Metals shall be of the corrosion-resistant type or suitably treated to resist corrosio
18、n due to fuels, salt spray, rain, humidity, and all other environmental conditions likely to be met in storage or normal service. The use of any protective coating that will crack, chip, or scale with age or extremes of environmental conditions shall be avoided. 3.5.3 Dissimilar metals. Unless suita
19、bly protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in MS33586. 3.6 Age, Cartridge propellant grain, igniter, and squib shall be no more than 6 months old from date of manufacture to date of delivery of
20、the cartridge assembly. 3.7 Design. The cartridge shall be designed to operateina cartridge starter breech having internal dimensions as shown on figure 1 and as further defined in 3.11.5. 3.7.1 Effect on metal. The cartridge shall not adversely affect the design life of any starter components due t
21、o the chemical properties of the cartridge exhaust gas. The cartridge contractor shall define in the model specification the chemical and metal- lurgical effect of the cartridge exhaust gases on aluminum and metals incorporated in the starters specified in 3.7.2. 3.7.2 Compatibility. The cartridge s
22、hall be so designed as to be compatible with cartridge starters conforming to MIL-S-27266. A compatibility test shall be conducted by the cartridge manufacturer to demonstrate compatibility of the cartridge with cur- rent starters. The procuring activity shall be contacted for copieS.of the latest t
23、est schedule and starters to be tested. 3.7.3 Electrical firing. The cartridge shall be designed to fire electrically after manual insertion into the starter breech. 3.7.4 Transportability. The cartridge sealed in its storage containershallbe trans- portable in any attitude within the ambient air te
24、mperature range defined in MIL-STD- 210 for cold and hot atmosphere up to a pressure altitude of 89,000 feet. 3.7.5 Reliability. The cartridge shall be designed to operate with a minimum reli- ability of 0.990 with a 90 percent confidence level. Satisfactory compliance with test requirements of this
25、 specification will have demonstrated compliance with this re- quirement, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6.54 - 5.1 5.7 7,048 7.028 4 I .97 I _. .95 “A “c / r / 6*50 6.55 R. “ 1,505 1.495 f b- 8,485 (REF.) 9.033 8.959 * 8 559 m * m *
26、EXTREME LIMITS OF TOLERANCE STACKUP FIGURE 1. Interior Dimensions of Cartridge Breech Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.8 Construction. The cartridge shall be so constructed as to provide the require- ments specified herein. It shall
27、be built to withstand all conditions encountered during shipment, storage, installation, and service. 3.9 Performance. Specific cartridge performance characteristics shall be called out in the model specification. The cartridge shall operate within the limits specified in table 1 and figure 3 when f
28、ired in a breech having internal dimensions as shown on figure 1 and as further defined in 3.11.5, when the breech is connected to a nozzle and volume simulator as shown on figure 2. 3,g.l Altitude, There shall be no deviation from the performance rating of this specification after the cartridge has
29、 been exposed to altitudes up to 80,000 feet while in its sealed storage container, 3.9.2 Temperatures. The cartridge shall ignite and operate satisfactorily throughout the temperature range of -65 to +160“F. 3.9.3 Attitudes. While installed in the starter breech, the cartridge shall perform satisfa
30、ctorily in any attitude. 3.9.4 Ratings. The cartridge shall meet the performancecriteriaspecifiedin table I for standard sea-level static conditions. 3.9.5 Flame temperature. The measured gas temperature for any firing from -65“ to “160F shall not exceed 2,100“F. The contractor shall specify in the
31、model speci- fication the adiabatic flame temperature of the propellant as defined in AF Specifica- tion Bulletin 508. 3.9.6 Performance variation. The standard deviation for each parameter at -65“ and “160F shall be specified in table II of the model specification. 3.9.7 Environmental conditions. T
32、he cartridge shall not suffer any detrimental ef- fects during or after exposure to temperature cycling, extreme temperature, salt spray, and humidity as anticipated in service. 3.9.7.1 Storage life (in metal container), When sealed initsindividual metal storage container and exposed for a minimum o
33、f 3 years to temperature cycling ranging from -65“ to +160“F, in any attitude, the cartridge shall not deteriorate to such extent that it cannot meet the performance requirements specified herein. In addition, the car- tridge shall withstand exposure to 300F for 2 hours without producing a hazardous
34、 condition during subsequent operation, 3.9.7.2 Storage life (out of container). The cartridge, removed from the container, shall withstand exposure to temperatures ranging from -65“ to +160“F, in any attitude, for 45 days without deteriorating to such extent that it cannot meet the performance requ
35、irements. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2DIA. 1 -2 WALL THICKNESS APPROXIMATELY 7 I .7 70 780 DIA. I .678 ,283 f.ooos DIA. ,688 DIA. NOZZLE MATERIAL: HAYNES STEL.LITE HS-21 OR EQUAL ,378 DIMENSIONS IN INCHES UNLESS OTHERWISE SPECIFI
36、ED TOLERANCES : DECIMALS .o10 ANGLES 22 FIGURE 2. Standard Test Orifice and Volume Simulator Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I f / 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 , 1.0 TIME SECONDS FIGURE 3. Ignition Envelope 1 I 9 Provided by I
37、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.9.7.3 Auto-ignition. When exposed to the extreme environmental conditions speci- fied in section 4, there shall be no auto-ignition of the cartridge or emission of com- bus tible gases, 3.9.7.4 Vibration, The cart
38、ridge shall be designed to withstand the vibration en- vironment anticipated during service life, 3.9.8 Drop requirement, The cartridge shall not be damaged to the point it will not function when dropped onto a concrete floor from a height of 4 feet. 3.10 Solid propellant, The grain of the solid pro
39、pellant shall be free of physical defects which would prevent the cartridge from meeting specified performance pa- rameters. The propellant shall be neutral burning with respect to pressure versus time. Following environmental cycling tests, the grain dimensions shall remain within specification lim
40、its, 3.10.1 Ballistic, physical, and mechanical properties. The ballistic, physical, and mechanical properties of the propellant shall be as specified in the model specification. 3.10.2 Auto-ignition temperature. There shall be no auto-ignition of the cartridge or components when it is exposed to a
41、temperature of 350F for 1 hour or 300F for 8 hours, The auto-ignition temperature for the propellant and ignition system shall be graphically presented in the model specification in the format of figure 4. The maximum safe temperature for extended storage shall be noted. 3.10.3 Propellant weight. Th
42、e weight of the propellant shall be determined by the performance requirements, and the allowable tolerances shall be stated in the model specification. 3.10.4 Restrictor and bonding agent. The composition of the restrictor and bonding agent shall be specified in the model specification. 3.10.5 Proc
43、essing. The propellant, restrictor, and bonding-agent processing speci- fications shall be listed in the model specification. These processing specifications shall be submitted for approval with the model specification, 3.10.6 Corrosion, The corrosive effect of the exhaust gases from propellant or i
44、gnition materials shall not reduce the design life of the starter or any airframe materials with which the gases may come in contact, The corrosive content and effect of the exhaust gases shall be specified in the model specification. 3,10.7 Erosion, Solids in the exhaust gases shall be held to a mi
45、nimum to limit erosion and avoid accumulation of solids in critical starter parts, The erosive effect of propellant and ignition materials shall be specified in the model specification. 3.10.8 Smoke, The light transmitted through the exhaust gases shall not be less than 75 percent. 10 “ - - - - .“ F
46、 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-f 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.10.9 Toxicity, The toxic effect of the exhaust gases shall not be hazardous to personnel expos
47、ed to these gases during starter bench tests and aircraft operation, The toxic properties shall be specified in the model specification. 3.10.10 Afterburning. There shall be no flaming at breech mating surfaces during or after operation of the cartridge. The cartridge exhaust gases shall not be capa
48、ble of sustaining ignition. 3.11 Case 3.11.1 Maximum operatingcase temperature, The cartridgecase shallbe so designed that the external surface temperature of breech caps of all starters specified in 3.7.2 shall not exceed 700F under any operating condition. 3.11.2 Expendability. The cartridge case
49、shall contain all of the cartridge com- ponents and shall be expendable; no reloading provisions will be considered, 3.11.3 Removal after firing, After the cartridge has been in the breech for a mini- mum of 1 minute after firing, the cartridge case shall be easily removable in one piece by personnel wearing thick gloves. No cleaning of the bre
