1、_- f. - . I -1 NIL-D-50727B 13 MIL-D- 50727B( MU) 11 June 1973 SUPERSEDING Mn;-D-50727A( MU) 21 October 1971 .o MILITARY SPECIFICATION DELAY ELEMENT ASSEMBLIES 1. SCOPE 1.1 This specification covers the production, assembly and inspection . requirements for Delay Element Assemblies. The assembly wil
2、l ultimately be loaded and used in conjunction with other propellant actuated devices in aircrew emergency escape systems. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent
3、 specified herein. SPECIFICATIONS Military MIL -A -2 5 50 - MIL-E- 5272 - MIL-C -60539 - STANDARDS Military MIL-STD-9 - - .-,. MIL-STDg105 MIL-STD-109 - MIL-STD-171 - Ammunition and Special Weapons, General Environmental Testing, Aeronautical and Specification For . Associated Equipment, General Spe
4、cification For and Aluminum Alloys Coating, Anodic, Conventional for Aluminum Screw Threads Conventions and Method of Sampling Procedures and Tables for Inspection Quality Assurance Terms and Definitions Finishing of Metal and Wood Surfaces Specifying by Attributes FSC 1377 Provided by IHSNot for Re
5、saleNo reproduction or networking permitted without license from IHS-,-,-_-_ MIL-D-50727B 13 W 777770b 042b802 1 W MIL-D- 50727B( MU) 4- 2.1 (Contd) DRAWINGS C Applicable Drawings 9266885 - Delay Element Assembly (See 6.1 and 6.3) - Container, Metal Packing Ammunition for De7ay Element Assembly 0.10
6、 Second Delay, 0.30 Second Delay, 0.60 Second Delay, 0.85 Second Delay, or 1.0 Second Delay - Box, Packing Ammunition for Delay Element Assembly 0.10 Second Delay, 0.30 Second Delay, 0.60 Second Delay, 0.85 Second Delay or 1.0 Second Delay 9266886 (Copies of specifications, standards, drawings and p
7、ublications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer). 2.2 Other publications.-The following document forms a part of this specification to the extent specified herein, the issue i
8、n effect on date of invitation for bid or request for proposal shall apply. Unless otherwise indicated, ASA B46.1 - Surface Texke m (Application for copies should be addressed to the American National Standards Institute, i430 Broadway, New York, N. Y. 3. REQUIRESIENTS 10018). 3.1 General.-Materials
9、, parts and assemblies shall comply with the requirements specified on the drawings pertaining to the applicable Delay Assembly specified in the invitation for Bid, Request for Proposal, contract or other procurement documents (see 6.1 and 6.3) and referenced specifications. 3.2 Protective finish.-W
10、hen protective finish is required by component details, finish requirements shall be as required on the drawings and reference specifications MIL-c-o and MIL-STD-171 and shall apply to all surfaces regardless of contour configurations. 3.3 Vibration,-The delay element assembly shall withstand vibrat
11、ions as prescribed in MIL-E-5272, Procedure XII, without evidence of any dis- integration of the primer or delay charge or derangement of components, 3.4 Primer sensitivity.-The primer when crimped and sealed in a retainer assembly shall fire when drop tested at an energy level of 26.0 inch - ounces
12、 and shall not fire when drop tested at an energy level of 4.0 inch - ounces, 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-50727B 13 m 7777706 0426803 3 m MIL-D- 50727B( MIT) 3.5 Functional. 3.5.1 The delay element shall not fail to fire.
13、3.5.2 Ballistics .-The delay charge shall produce the delay time required by the applicable assembly drawing. 3.6 Workmanship. -Workmanship shall be in accordance with the requirements of the applicable drawings, referenced specifications and the following: 3.6.1 Metal defect.-The metal parts shall
14、be free from cracks, splits, inclusions, porosity or other metal defects. 3.6.2 Burr.-The part shall not have a burr which might interfere - with the assembly or function of the item, or which might be injurious to personnel handling the item. 3.6.3 Foreign matter.-The part or assembly shall not con
15、tain chips, dirt, grease, rust, corrosion, or other foreign matter. 4. QUALLCTY ASSURANCE PROVISIONS 4.1 Responsibility for inspection.-Unless otherwise specified in the contract or purchase order, the supplier is responsible for the per- formance of all inspection requirements as specified herein.
16、Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the -Government. inspections set forth in the specification where such inspections are deem
17、ed necessary to assure supplies and services conform to prescribed requirements. t The Government reserves the right to perform any of the 4.1.1 Quality Assurance terms and definitions .-Reference shall be made to MIL-STD-109 to define Quality Assurance terms used. 4.1.2 4.2 First Article sample. 4.
18、2.1 Inspection.-Inspection shall be in accordance with MIL-A-2550. Initial production sample .-At the beginning of regular production, a sample shall be submitted in accordance with contract requirements and shall consist of 100 primer retainer assemblies for primer sensitivity test, 30 delay elemen
19、t assemblies for vibration and ballistic tests and 10 sets of unassembled components for visual and dimensional examination and tests. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. -_ _._II_- -I_- MIL-D-50727B 13 - 7999906 042680i 5 W 1 MIL-D-
20、50727B(MU) 4.2.1 (Cont d) The sample shall be manufactured, using the same materials, equipment, processes and procedures as used in regular production. All parts and materials, includ+ng packaging and packing shall be the same as used for regular production and shall be obtained from the same sourc
21、e of supply 4.2.1.1 Examination and Tests.-After examination and provisional acceptance at source, the sample shall be inspected for all requirements of the drawings and specifications at a Government laboratory or such other facility specified in the contract. TABLE I Temperature Vibrated . Not Vib
22、rated -65; to -7O:F 4 65, to 75,F 4 200 to 205 F 4 6 6 6 4.2.1.3 Initial production sample failure.-Failure of the sample a- to comply with the requirements of the drawings and specifications shall result in sample disapproval. 4.3 Inspection provisions. 4.3.1 - Lot. 413.1.1 Submission of product.-T
23、he product shall be submitted in accordance with MIL-STD-105. 4.3.1.2 Size of lot.-An munition lot shall consist of an identifiable group of Delay Element Assemblies consisting of: a. Components produced by a homogeneous process. b, C. Primers from not more than one lot. Delay charge from not more t
24、han one lot. d. Output charge from not more than one lot. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-._- I MIL-D-507278 13 m 7977706 0426805 7 m MIL- D50727B(W 4.3.2 Examination.-One-hundred percent examination shall be performed I for all cri
25、tical defects. be performed on a defect basis in accordance with the classification of defects contained herein,using the sampling plan and associated criteria in Tables II and III. the criteria in Table II shall be used. For total defects within a major or minor group, the criteria in Table III sha
26、ll be used. material shall be rejected. The roughness comparison specimens prescribed in ANSI-B46.1 shall be used as a basis of comparison for surface roughness determination. visual examination for such defects as burr and foreign matter. Examination for major and minor defects shall For an individ
27、ual defect (single characteristic) All non-conforming Four power (4X) magnification may be Used in performing TABLE II Major Lot Size Sample Size Accept Reject 1 - 300 100% Examination - - 301 - i300 110 1 2 i301 - 3200 150 2 3 3201 - 8000 225 3 8001 - 22000 300 4 5 4 TABLE III Total Allowable Defec
28、ts per Sample Size Sample Sizes for Major Defects 110 150 Minor Accept Reject 2 3 3 4 4 5 5 6 225 300 No. of Defects in Class 1 2 3 4 2 3 4 5 8 - i9 3 4 5 -7 2- 3 4- 7 20 - 43 Over 43 10 4 5 8 6 8 11 i4 110 Sample Sizes for Minor Defects No. of Defects in Class 2- 3 4- 7 8 - 16 17 - 48 Over 48 150 2
29、25 300 3 4 5 4 5 7 5 8 10 8 11 14 11 17 20 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ - MIL-D-50727B 13 999990b 0426806 9 W MIL-D-50727B (MU) 4.3.2.1 Body, Drawing Di173i623, covering a detail of the applicable Delay Element Assembly Drawin
30、g. DEFECT METHOD OF INSPECTION 0 CRITICAL Metal defect ive MAJOR 101. 102 . 103 . 104, 105 i06 . i07 i08 . log 110 . 111. 112 O 113 li5 e 114 . u6 . i17 . 118 . -120 . 121. Pitch diameter of internal threads, ma. Pitch diameter of external threads, min. Minor diameter of internal threads, ma. Major
31、diameter of external threads, min. Concentricity of pitch diameter of True position of long cavity with counter- Concentricity of flash hole with counter- True position of small diameter with True position of large diameter with True position of small diameter of external thread with counter-bore bo
32、re bore counterbore counterbore tapered bore with pitch diameter of internal thread tapered bore with pitch diameter of internal thread Concentricity of pitch diameter of internal thread with flash hole Diameter of counterbore, max. Diameter of long cavity, max. Large diameter of tapered bore, max.
33、Depth of counterbore, max. Depth of long cavity, min. Depth of angle counterbore from face of Length from face of small outside diameter Symmetry of wrench flats with large outside Angle at bottom of tapered bore True position of large diameter of body to shoulder diameter Visual Gage Gage Gage Gage
34、 -. Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage a- o 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-50727B 13 = 9999906 0426807 O 122. 123. 124. 125. 126. 127. 128. 129. Defect . Length of internal thread, from
35、 face max, Length of internal thread from face, min. Diameter of flash hole Protective finish inadequate or defective Burr Foreign matter Length from face to bottom of tapered bore Surface finish on tapered bore 4.3.2.1 (Contd). Method of Inspection Gage Gage Gage Vi sua1 Visual Visual Gage Visual M
36、INOR 201 202. 203. 204. 205. 206. 207. 208. 209. 210. 211. 212. 213. 214 e 215. 216. 217. Pitch diameter of internal thread, min. Pitch diameter of external thread, mx. Diameter of counterbore, min. Diameter of long cavity, min. Diameter of small end Diameter of body Large diameter of tapered bore,
37、min. Depth of counterbore, min. Depth of long cavity, max. Dimension over flats Width of undercut Diameter of undercut, min. Length from face to external thread Length of wrench flats from face Total length Radius of chamfer missing or incorrect Surface finish improper, except as otherwise classifie
38、d Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Gage Visual Visual 4.3.2.2 Drawing Ci1731585. Retainer, Primer, Drawing Bi1731620 , covering a detail of CRITICAL 1. Metal defective MAJOR 101. 102. True position of primer pocket with outside True position of flash hole with ou
39、tside diamet er diamet er Visual Gage Gage 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-h flIL-D-50727B 13 m 799790b 042bBOB 2 m MIL-B-50727B( MU) 3 4.3.2.2 (Contd) -. Defect Method of inspection 103. Diameter, outside, max, 104. 105. Depth of p
40、rimer pocket 106. Total length 107. 108. Surface finish improper 109. Burr or sharp corner 110. Radius or chamfer missing 111, Foreign matter Diameter of primer pocket, max. Protective f-inish inadequate or defective Gage Gage Gage Gage Visual Visml Visual Visual Visual MINOR Gage Gage Gage 201, Dia
41、meter of flash hole 202. Diameter, outside, min. 203. 204. Diameter of grimer pocket, min. Surface finish improper, except as otherwise classified Visual 4.3.2.3 Primer, Percussion, 1442, Drawing B8799925, covering a det of Drawing C11731585. CRITICAL 1. Improper assembly . Visual 3. Primer pellet b
42、roken, cracked or dislodged Visual 4. Metal defective Visual 5. Primer foil discolored Visual 6. Mixed primers Visual 2. Any part missing Visual MAJOR 101. Burr 102. Fanreign matter MINOR Visual Vi sua1 il - None define 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without l
43、icense from IHS-,-,- 4.3.2.4 Retainer and Primer Assembl Drawing Ci1731585 coverin a detail of the applicable; u Defect Method of Inspection -. CRITICAL 1. pocket X-Ray I/ and Visual 2. Improper assembly . X-Ray 1/ and Visual 3. Any gart missing X-Ray 1/ and Visual 4, Primer pellet broken, cracked o
44、r dislodged Visual 5. Mixed primer Visual 6. Metal defective Visual Primer not properly seated in primer MAJOR 101. Sealant .missina - 102. 103. Burr Primer crimp missing or incorrect 104. Foreign matter MINOR 201. Diameter of body, mx, 202. Total length Visual Visual Visual Visual Gage Gage The ret
45、ainer and primer assembly shall be X-Rayed with the assembly in a position perpendicular to the rays of the X-Ray machine. X-Rays properly identified shall be forwarded to the procuring activity. The 4.3.2.5 Assembly - Applicable Delay Element Assembly Drawing. CRITICAL 1. Improper assembly X-Ray I/
46、 and Visual 2. Any part missing X-Ray L/ and Visual 3. Mixed ammunition Visual 5. Marking missing, incorrect or illegible Visual 6. Metal defective Visual 4. Flash hole missing or obstructed Visual MAJOR 101. Output charge not visible through flash hole Visual 9 Provided by IHSNot for ResaleNo repro
47、duction or networking permitted without license from IHS-,-,-MIL-D-50727B 13 779990b 0426830 O MILD -50727B( MU) .r 4.3.2.5 (Cont d) Defect Method of Inspection 102. , Primer retainer not flush or below Visual 103. Visual 104. Protective finish inadequate or defective Visual surface “S “ Junction of
48、 primer retainer and delay body not properly sealed or crimped MINOR 201. Total length, mx. Gage 202. Varnish missing Visual I/ The delay element shall be X-Rayed with the long axis of the delay element perpendicular to the rap of the X-Ray machine. The X-Ray negatives, properly identified, shall be
49、 forwarded to the procuring agency. 4.3 2.6 Container , Ammunition , ?wg, C9266885. CRITICAL None defined MAJOR None defined MINOR 201. Contents loose Manual/Vi s ual 202. Quantity of contents incorrect Visual Vi sua1 203. Separator or filler missing 204. Sealing inadequate, incomplete or incorrect Visual 205. Container cut or damged Visual 206. Marking missing, incorre
