1、 INCH-POUND MIL-DTL-70526B(AR) 6 April 2009 SUPERSEDING MIL-P-70526A(AR) 6 July 1994 DETAIL SPECIFICATION PROJECTILE, 105 MILLIMETER, HE, RA- M913/M927, DELAY ASSEMBLY FOR This specification is approved for use by the U.S. Army Armament Research Development and Engineering Center (ARDEC), and is ava
2、ilable for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification contains requirements and quality assurance provisions for the fabrication and packaging of parts and assembly of the delay assembly for the 105MM, High Explosive, Rocket Assisted, M91
3、3 / M927 Projectiles. AMSC N/A FSC 1315 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Comments, suggestions, or questions on this document should be addressed to the Commander, U.S. Army ARDEC, ATTN: RDAR-QES-E, Picatinny Arsenal, NJ 07806-5000 or emailed to ardec
4、stdznconus.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Inactive for new design after 21 August 1998 Provided by IHSNot for ResaleNo reproduction or networking permitted
5、without license from IHS-,-,-MIL-DTL-70526B 22. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents sited in other sections of this specification or recommended for additional informat
6、ion or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, s
7、tandards and handbooks. The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-P-217 - Potas
8、sium Perchlorate (for pyrotechnics) MIL-T-48140 - Tungsten Powder (for pyrotechnics) MIL-V-50433 - Vinyl Alcohol Acetate Resin Solution (VAAR) (For Use Ammunition) DEPARTMENT OF DEFENSE STANDARDS MIL-STD-1168 - Ammunition lot numbering and ammunition data cards MIL-STD-1234 - Pyrotechnics; Sampling,
9、 Inspection and Testing MIL-STD-1916 - DoD preferred methods for acceptance of product (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other
10、 Government documents, drawings and publications. The following other Government documents, drawings and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation Provided by IHSNot for ResaleNo reproduction o
11、r networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 3US ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (ARDEC) DRAWINGS 12926809 - Delay Assembly 13023959 - Radiographic Inspection Method for Artillery Projectiles and Components (Copies of these drawings may be reques
12、ted online at Drawing.Requestconus.army.mil or from U.S. Army ARDEC, ATTN: RDAR-AIS-TD, Picatinny, NJ 07806-5000.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those
13、 cited in the solicitation or contract. ASTM INTERNATIONAL (ASTM) ASTM B430 - Standard Test Method for Particle Size Distribution of Refractory Metal Powders and Related Compounds by Turbidimetry (Copies of ASTM standards are available online at http:/www.astm.org or from American Society for Testin
14、g and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in th
15、is document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Required inspections. 3.1.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.1.2 Conformance.
16、A sample shall be subjected to conformance inspection in accordance with 4.3. 3.2 Components and assemblies. The components and assemblies shall comply with all requirements specified on drawing (dwg.) 12926809. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
17、m IHS-,-,-MIL-DTL-70526B (AR) 43.3 Ammunition lot numbering. Ammunition lot numbers shall be assigned in accordance with MIL-STD-1168. 3.4 Pyrotechnic composition, total volatiles. The total volatiles of the flash, delay and igniter composition at the time of loading shall not exceed 0.10 percent. T
18、he flash, delay and igniter compositions shall comply with dwg. 12926809. 3.5 Crimp strength. The washer crimp shall be capable of withstanding a 500 pound minimum load. 3.6 Pyrotechnic porosity test. The pressure recorded at the exit end of the delay assembly; 80 seconds after application of the ni
19、trogen gas shall not exceed 9 PSIG above the zero reference. The pressure recorded at the exit end of the delay assembly 110 seconds after application of the nitrogen gas shall be no greater than 19 PSIG above the zero reference. 3.7 Radiographic inspection. The delay column shall not be missing or
20、be short in length. There shall be no voids or low density areas in the area of individual increments in the delay column. There shall be no evidence of aluminum slivers in the delay column. The flash or igniter composition shall not be missing. The boron potassium nitrate pellets shall not be missi
21、ng, contain voids greater than 1/64th square inch, or have a gap between the top of the closure greater than 1/8th inch. The delay washer shall not be missing. 3.8 Performance. (See 6.22 for definitions). 3.8.1 Pilot composition. The pilot composition shall be acceptable when the ballistic delay bur
22、n times of the pilot composition batches show that the required burn time of 15.25 + .75 seconds at 70 degrees F is met by at least one batch or is bracketed by at least one batch on the high and low ends so that an optimal burn time fuel ratio may be determined. The standard deviation of the batch(
23、es) meeting the requirement shall not exceed .62 seconds when ballistically tested at 70 degrees F in accordance with 4.4.7. When ballistically tested at -50 degrees F, the delay shall function to the extent that it ignites the rocket motor. During static spin testing, the samples shall not contain
24、any long burn time statistical outliers. The results shall be used to set the fuel level for production. (See 6.17) 3.8.2 Delay composition. Each lot of delay composition shall be ballistically tested at 70 degrees F and -50 degrees F. The production batch shall have a mean time of 15.25 + .75 secon
25、ds and a standard deviation no greater than .62 seconds when ballistically tested at 70 degrees F. For -50 degree F testing, the delays shall function properly to the extent it Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 5igni
26、tes the rocket motor. Static spin stand testing shall be performed to determine suitability for ballistic testing and to establish a baseline for delay assembly testing. During static spin testing, the standard deviation shall not be greater than 0.62 seconds, and no long burn time outliers shall be
27、 present. 3.8.3 Delay assembly. Each production lot produced shall have an acceptable static spin mean time per 4.4.8 and 4.4.9 or an acceptable ballistic mean time of 15.25 + .75 seconds at 70 degrees F and proper function at -50 degrees F when tested ballistically. 3.8.4 Ballistic safety. There sh
28、all be no in-bore function (see 6.22 for definitions) of the delay or rocket motor. 3.9 Selector cap. After radiographic inspection of the delay the selector cap shall be assembled hand tight. 3.10 Particle size. 3.10.1 Tungsten particle size. The tungsten shall meet all requirements of MIL-T-48140
29、for TYPE I (Agglomerated) with a bulk density ranging from 50-65 grams per cubic inch. 3.10.2 Potassium perchlorate particle size. In addition to the requirements of MIL-P-217, the particle size at the 50% level shall be 85 +/- 10 microns. 3.11 Workmanship. The requirements of workmanship are as fol
30、lows: a. Cleaning. If required the cleaning method shall not be injurious to any of the parts nor shall the parts be contaminated by the cleaning agent. b. Delay assembly. Parts shall be free of burrs, chips, dirt, grease, rust and other foreign matter. 3.11.1 Boron potassium nitrate. The boron pota
31、ssium nitrate pellets shall not have flashing or any other form of protrusion attached thereto. The boron potassium nitrate charge shall be free of dust, shards, and other types of particles at the time of loading into the delay assembly. Provided by IHSNot for ResaleNo reproduction or networking pe
32、rmitted without license from IHS-,-,-MIL-DTL-70526B (AR) 64. VERIFICATION TABLE I. Requirement/verification cross reference matrix Methods of Verification Classes of Verification 1 Analysis 2 Demonstration 3 Examination 4 - Test A- First Article B- Conformance Section 3 Requirements Description Veri
33、fication Method Verification Class Section 4 Verification 1 2 3 4 A B 3.1.1 First article X X X 4.2 3.1.2 Conformance X X X 4.3 3.2 Components and assemblies X X X X 4.3.2.1-4.3.2.7, 4.4.2, 4.4.3 3.3 Lot numbering X X X X 4.3.1 3.4 Pyrotechnic composition, total volatiles X X X X 4.4.1, 4.3.2.3 3.5
34、Crimp strength X X X X 4.4.4, 4.3.2.3 3.6 Pyrotechnic porosity test X X X X 4.4.5, 4.3.2.3 3.7 Radiographic inspection X X X X 4.4.10, 4.3.2.5 3.8.1 Pilot composition test X X X X 4.4.6.1, 4.4.7, 4.4.8 3.8.2 Delay composition test X X X 4.4.6.2, 4.4.7, 4.4.8 3.8.3 Delay assembly testing X X X 4.4.6.
35、3, 4.4.7-4.4.9 3.8.4 Ballistic safety X X X X 4.3.2.7 3.9 Selector cap X X X X 4.3.2.6 3.10.1 Tungsten particle size X X X X 4.4.11, 4.3.2.3 3.10.2 Potassium perchlorate particle size X X X X 4.4.11, 4.3.2.3 3.11 Workmanship X X X X 4.3.2.1-4.3.2.6 3.11.1 Boron potassium nitrate X X X X 4.3.2.4 Prov
36、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 74.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2). b. Conformance inspection (see 4.3). 4.
37、2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with Table II. 4.2.1 First article quantity. First article inspection shall be performed on the quantity of items as indicated in Table I. 4.2.2 Inspections to be performed. The first art
38、icle inspection shall be performed in accordance with Table II. 4.2.3 First article rejection. If any item fails to comply with requirements, the first article sample shall be rejected. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (
39、AR) 8TABLE II First article inspection Number of FAT Samples REQUIREMENT PARAGRAPH INSPECTION METHOD REFERENCE Delay assembly (Drawing 12926809) Examination for defects (Note 1) 30 3.2 4.3.2.1-4.3.2.6 Delay housing crimp test 5/machine 3.5 4.4.4 Pilot composition test 150 3.8.1 4.4.6.1 Note 1. The e
40、xamination for defects in paragraph 4.3.2 in many cases must be verified during assembly. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 94.3 Conformance inspection. 4.3.1 Lot formation. Lot numbering shall be in accordance with
41、MIL-STD-1168. Lot formation shall be in accordance with lot formation requirement of MIL-STD-1916. In addition, each inspection lot of the M927/M913 Delay Assembly shall contain: a. Inert parts from one interfix lot number from one manufacturer. b. Flash composition from not more than one raw materi
42、al constituent ingredient lot. c. Delay composition from not more than one inspection lot. d. Igniter composition from not more than one raw material constituent ingredient lot. e. Boron Potassium Nitrate pellets from not more than one interfix lot number from one manufacturer. 4.3.1.1 Delay composi
43、tion lot. A delay composition lot (see 6.22) may be formed by any of the following methods: a. Blending two or more batches of delay powder together to form a delay composition lot. b. Designating a batch of delay powder or delay pellets as delay composition lot. Once samples are selected from the b
44、atch or delay composition lot, the batch or lot shall not be subsequently blended. 4.3.2 Classification of characteristics. a. Sampling requirements. Inspection sampling requirements for critical, major and minor characteristics are defined in MIL-STD-1916. Unless specified otherwise, Inspection Lev
45、el IV shall be used for all characteristics defined as Majors and Inspection Level II for all Minor characteristics; Critical characteristics shall be addressed in accordance with MIL-STD-1916. b. Conformance inspection. Conformance inspection shall be performed in accordance with paragraph 4.3.2.1
46、through 4.3.2.7. For all conformance inspections the same sample specimen may be used for all non-destructive examinations or tests. c. Alternative Inspections. Alternative conformance inspections may be submitted and approved in accordance with MIL-STD-1916. See 6.7. Provided by IHSNot for ResaleNo
47、 reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 10PARAGRAPH 4.3.2.1 TITLE Delay assembly, prior to loading delay composition SHEET 1 OF 1 DRAWING NUMBER 12926809 NEXT HIGHER ASSEMBLY - CLASSIFICATION EXAMINATION OR TEST CONFORMANCE CRITERIA REQUIREMENT PARAGRAP
48、H INSPECTION METHOD REFERENCE Critical None defined Major 101 Flash composition on sidewall Level IV 3.2 Visual Minor 201 Evidence of poor workmanship Level II 3.11 Visual Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-70526B (AR) 11PARAGRAPH 4.3.2.2 TITLE Delay assembly, Prior to loading igniter composition SHEET 1 OF 1 DRAWING NUMBER 12926809 NEXT HIGHER ASSEMBLY - CLASSIFICATION EXAMINATION OR TEST CONFORMANCE CRITERIA REQUIREMENT PARAGRAPH INSPECTION METHOD REFERENCE Critical None defined Major 1
