1、MIL-1-85326 13 9777706 03611964 3 U MILITARY SPECIFICATION IG JITER, ROCKET MOTOR, MARK 297 40D O -.MI 25 September 1979 This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all departments and agencies of the Department of Defe
2、nse. 1. SCOPE 1.1 Scope. This specification covers Igniter, Rocket Motor, Mk 297 Mod O referred to herein as the igniter. The igniter is used in the Mk-36 rocket motor. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents of the issue in effect on date of invitation for bids or r
3、equest for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-(2-4566 2 STANDARDS MILITARY MIL-STD-8 1 O Calibration System Requirements Environmen tal Test Methods Beneficial comments (recommendations, additions, deletions) and any pertinent data
4、 which may be of use in improving this document should be addressed to: (Commanding Officer, Naval Air Engineering Center, Engineering Specifications and Standards Department (ESSD) Code 93, Lakehurst, NJ 08733) by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426)
5、 appearing at the end of this document or by letter. THIS DOCUMENT CONTAINS /o PAGES. e _- i. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-8 53 26(AS) DRAWINGS Naval Air Systems Command (Code Ident 30003) 1 204AS20 1 1204AS206 Lever, Locking
6、 1204AS2 1 1 Disk, Rupture 1204AS2 15 Seal 1 204AS2 1 7 2623628 2605139 Case Assembly Igniter, Rocket Motor, Mk 297 Mod O Decalcomania, Safe/Arm Arming Key and Safety Flag Assembly (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific proc
7、urement functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), the contractor shall furnish sample units for first article inspection and approval (see 4.4 and 6.4). 3.2 Conformance to document
8、s. Unless otherwise specified herein, the igniter and igniter components shall conform to the requirements specified herein and on Drawing 1 204AS20 1. 3.3 Function. 3.3.1 ARM function. The igniter shall attain a pressure of 75 psig minimum within 50 milliseconds after To and a pressure of 110 psig
9、minimum within 100 milliseconds after To as shown in figure 1 when fired in the test chamber of 4.3.4. (See 4.6.1.1) 3.3.2 SAFE function. When the igniter is fired in the SAFE position, the seal (Draw- ing 1204AS215), boron-potassium-nitrate pellets, and rupture disk (Drawing 1204AS21 l) shall not s
10、how any evidence of hot gas leakage. It shall withstand an arming torque of 100 in-pounds minimum without rotation to the ARM position. (See 4.6.1.2) 3.4 SAFEIARM operation. 3.4.1 Automatic safe return. The igniter shall automatically return to the SAFE posi- tion if not positively locked in the ARM
11、 position. (See 4.6.2.1) 3.4.2 Arming torque. The torque required to ARM the igniter shall be 4 to 14 inch- pounds. (See 4.6.2.2) F - r 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Typical curve Minimum acceptable boundary I Time after Tg (ms) T
12、o T1 NOTE: See 6.5 for definitions. FIGURE 1. Functional requirements. 3.4.3 Arming key removal. The arming key, Drawing 2623628, shall be removable only in the ARM position. (See 4.6.2.3) 3.5 Ignition circuit resistance. The igniter squib bridge resistance shall be 0.5 * O. 1 ohm at 70 f 10F. (See
13、4.6.3) 3.6 Workmanship. The igniter shall be free from explosive material on all external surfaces, uniform in quality, free from foreign material, and manufactured in a manner to assure compliance with the requirements of this specification and applicable drawings. (See 4.6.7) 4, QUALITY ASSURANCE
14、PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract, the con- tractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suit
15、able for the performance of the inspection requirements specified herein, unless disapproved by the Government. The 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 pr
16、escribed requirements. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85326 13 m 9999906 036LI467 9 = MIL-1-8 5 3 26(AS) a. First arti
17、cle inspection (See 4.4) b. Quality conformance inspection (See 4.5) 4.3 Inspection conditions. Unless otherwise specified the igniter shall be tested at the atmospheric pressure conditions of the test facility. 4.3.1 Equipment and facilities. Test equipment and inspection facilities shall be pro- v
18、ided by the testing activity, and shall be of sufficient quality and quantity to permit the performance of the required tests and measurements, under the conditions and to the accuracies specified herein. 4.3.2 Maintenance and calibration. All test equipment shall be calibrated and main- tained in a
19、ccordance with the provisions of MIL-C-45662. Certification to this effect shall accompany all reports of quality verification, first article, or quality conformance inspections. 4.3.3 Test equipment. The test equipment shall provide a recording system having capabilities of measuring: a. Pressure o
20、f 750 psig with an accuracy of 11.5 percent of calibration range b. Response of 100 psi perms, minimum c. Time graduations of 100 I 20 ms per inch 4.3.4 Test chamber. The empty test chamber shall be a cylindrical chamber having a free volumeof 181 I 2 cubic inches, and a length of 13-1/8 k 1/16 inch
21、es. The chamber shall have two pressure taps, located 180 degrees apart and approximately 10.5 inches from end of chamber to which the igniter is attached. One end of the chamber shall provide igniter mounting features duplicating those of the SIDEWINDER case and forward closure. 4.4 First article i
22、nspection. First article inspection shall be performed by the con- tractor, after award of contract and prior to production, at a location acceptable to the Government. First article inspection shall be performed on sample units which have been x produced with equipment and procedures normally used
23、in production. First article approval is valid only on the contract under which it is granted, unless extended by the Government to other contracts. 4.4.1 Sample size. Unless otherwise specified, 22 igniters shall be subjected to first article inspection. 4.4.2 Inspection routine. The sample shall b
24、e subjected to tests as shown in table I. 4.5 Quality conformance inspection. Quality conformance inspection shall consist of the tests of 4.6.1,4.6.2,4,6.3, and 4.6.7. Each igniter in the lot shall be subjected to the tests of 4.6.2,4.6.3 and 4.6.7. 4 Provided by IHSNot for ResaleNo reproduction or
25、 networking permitted without license from IHS-,-,-MIL-1-85326 13 - 7777906 0364468 O W - MIL-1-853 26(AS) 21 4 m U n U !a 00 24m U !a 21 4 m U n 21 4 U n 21 4 u !a w LO =I 4 e? U n a Lo 001 4 w U na L(3 X Y WI 4 w U nw cr, (3 m Y N 4Fg U n w cr, (3 -4 U n w LO 5 Provided by IHSNot for ResaleNo repr
26、oduction or networking permitted without license from IHS-,-,-MIL-1-85326 13 7997906 0364q67 2 4.5.1 Lot. A production lot of igniters shall consist of all components and subassem- blies that will comprise a lot of igniters for assembly with rocket motors. An igniter lot shall not include more than
27、one igniter grain lot. 4.5.2 Sampling. The samples shall be randomly selected from the above defined lot, and assembled for testing in accordance with the applicable test procedure. In accordance with table II, two sample groups shall be selected and designated as sample Groups A and B. Sample group
28、 A shall be subjected to the test of 4.6.1.1 and Sample group B subjected to the test of 4.6.1.2, 4.6 Tests and examinations. 4.6.1 Function, Function tests shall be conducted with the igniter (including com- ponents and subassemblies) assembled into a test chamber in accordance with 4.3.4. 4.6.1.1
29、ARM function. Each igniter to be tested shall be temperature conditioned for 4 hours minimum. It shall then be placed in the ARM position and fired with a firing current of 3.5 plus 0.2 minus 0.5 amperes dc within 10 minutes after removal from the conditioning chamber. 4.6.1.2 SAFE function, Each ig
30、niter to be tested shall be temperature conditioned for 4 hours minimum. It shall then be fired in the SAFE position using a firing current of 3.5 -F 0.2; -0.5 amperes d.c. within 10 minutes after removal from the condi- tioning chamber. After firing a counterclockwise torque of 100 inch-lbs minimum
31、 shall be applied to the arming key. This shal not result in rotation to the ARM position. The igniter shall then be disassembled and the seal, boron-potassium-nitrate pellets, and rupture disk visually examined for evidence of hot gas leakage. 4.6.2 SAFE/ARM operational test. SAFE/ARM operational t
32、ests shall be conducted with the igniter assembled into the rocket motor with adapter of figure 2 installed, or in a fixture which simulates the rocket motor with warhead assembled. TABLE II. Quality conformance sampling plan. Sample distribution Lot size Sample size Groups A B Function temperature
33、-65“ f 5 - * 70 +5 165“ f 5 I- Up to 800 30 24 3 3 80 1-3200 40 32 4 4 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-65326 13 7777706 0364Lt70 7 W MIL-1-853 26(AS) Item 1, Dwg 2605139 modified as shown NOTE for firing and designated environ
34、mental test Adapter secures forward head closure FIGURE 2. Environmental test adapter. 4.6.2.1 Automatic safe return. With the igniter in the locked ARM position the arm- ing key shall be installed and depressed to disengage the locking lever, Drawing 1204AS206. When the arming key is released, the
35、igniter shall rotate and lock in the SAFE position within 3 seconds. 4.6.2.2 Arming torque. The maximum torque shall be measured during rotation of the arming key from the SAFE position to the ARM position as directed on decal, Drawing 1204AS2 17. 4.6.2.3 Arming key removal. With the igniter in the
36、SAFE position, a radial pull of 10 f 0.5 lbs shall be exerted on the arming key. The key shall be retained within the rocket motor or fixture when subjected to this force. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-8532b 13 W 977970b 03644
37、73 O W 4.6.3 Ignition circuit-resistance. The resistance of the initiator circuit shall be meas- ured, prior to installation in the motor, using a circuit tester that limits the current flow to 0.010 amperes maximum, and is accurate within .O1 ohm. 4.6.4 Vibration. The igniters (in ARM position) sha
38、ll be subjected to random vibration, while conditioned at temperature extremes, in accordance with MIL-STD-8 1 O (Test conditions) and Method 5 14 except as noted herein. The random vibration profile shall be a flat power spectral density from 10 Hz to 2000 Hz a level of 0.02 g2/Hz. Vibration contro
39、l filter cut-off characteristics shall roll-up to 1 O Hz and roll-off at 2000 Hz, equal to or greater than the rate of +18 dB/octave and -18dB octave respectively: The igniters shall utilize service attachment when assembled to the vibration fixture representing the rocket motor interface, The ignit
40、ers, while assembled to the vibration fixture, shall be conditioned for a minimum of four hours prior to vibration at each of the three following temperatures; -65“ rC. 5“ F, +165“ f 5“ F, +70“ f 5“ F. The igniters, while exposed to each of the above tempera- tures shall be subjected to random vibra
41、tions for a period of no less than one hour per axis for a total of nine hours vibration. After completion of the vibration testing the igniter shall meet the requirements of 3.4.2, 3.5, and 3.6. 4.6.5 Thermal cycle. The igniters specified shall be subjected to five full temperature cycles with the
42、safe-arm assembly in the SAFE position. The temperature limits shall be -65“ f 5F and 165“f 5F. A full cycle shall consist of conditioning the unit for 4 hours + 30 minutes; -O.minutes at one temperature limit, transferring the unit within 10 minutes to the other temperature limit, conditioning the
43、unit for 4 hours + 30 minutes; -0 minutes and return to the original temperature limit. One-half of the sample shall begin cycling at -65F and one-half at 165F. After testing, each unit shall meet the requirements of 3.4.2, 3.5, and 3.6. 4.6.6 Mechanical actuation. Each igniter indicated (See table
44、I) shall be manually armed and returned to safe for 250 cycles. Arming shall be accomplished as directed on the decal, Drawing 1204AS2 17, using the arming key, Drawing 2623628, supplied as part of the igniter. After completion of each 50 cycles, or whenever the arming torque appears excessive, the
45、arming torque shall be measured. After completion of 250 cycles the unit shall meet the requirements of 3.4,3.5, and 3.6. 4.6.7 Visual examination. The igniter shali be visually inspected for conformance to the workmanship, finish, cleanliness, presence of components, visual arm indication, and mark
46、ing requirements. Component parts shall be dimensionally inspected for compliance with the applicable drawings. 5. PACKAGING (This section is not applicable to this specification). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot fo
47、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-8532b 13 e 777770b 036111173 4 W MIL-1-8 53 L(AS) 6.3 Advisory note. Sleeve inserts (steel) within the test chamber located opposite the holes in the igniter will prevent erosion of chamber wall, but compensation for
48、the volume of the sleeves must be made. 6.4 First article. When a first article is required, it shall be tested and approved under the appropriate provisions of 7-104.55 of the Defense Acquisition Regulation. The first article shall consist of 22 units. The contracting officer shall include specific
49、 instructions in all procurement instruments, regarding arrangements for examinations, test and approval of the first article. 6.4.1 Supplemental testing. Static firings of Mk 36 Rocket Motors may be required at the discretion of the procuring activity. 6.5 Definitions 6.5.1 Zero time (TO). TO is defined as the time that the current is applied to the initiator. 6.5.2 Delay time (TI )
