1、I a S NIL-S-552bE 59 M 7777706 0222327 O MIL-S-55286E(CR) 11 October 1983 SUPERSEDING 5 December 1979 MIL-S-55286D(CR) MILITARY SPECIFICATION SHELTER, ELECTRICAL EQUIPMENT S-280( )/G This specification is approved for use by Communications and Electronics Command, Department of the Army and is avail
2、able for use by all Departments and Agencies of the Department of Defense 1. SCOPE 1.1 Scope.- This specification covers one type of lightweight field and mobile shelter designed for transport by cargo truck, fixed or rotary winged aircraft, by rail, ship, and landing craft, designated as Shelter, E
3、lectrical Equipment S-280( )/G (See 6.6). 2. APPLICABLE DOCUMENTS 2.1 Issues of documents.- 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 MILITARY M IL-W - 6 8 5
4、 8 Welding, Resistance: A,uminum, Magnesium, Non-Hardening Steels or Alloys, Nickel Alloys, Heat-Resisting Alloys, and Titanium Alloys; Spot and Seam E4 I L-W- 8 60 4 Welding of Aluminum Alloys: Process for MIL-M-13231 Marking of Electronic Items Beneficial comments (recommendations, additions, dele
5、tions) and any pertinent data which may be of use in improving this docu- ment should be addressed to: Commander, US Army Communications and Electronics Command, ATTN: DRSEL-ED-SS, Fort Monmouth, New Jersey 07703, by using the self-addressed Standardization Document Improvement Proposal (DD Form 142
6、6) appearing at the end of this document or by letter. FSC-54 1 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-14072 Finishes for Ground Electronic Equipment MIL-S-55507 Shelter, Electrical Equipment, (Empty), Packaging of STANDARDS MILITARY
7、 i: MIL-STD-105 MIL-STD-169 Extreme-Temperature Cycle . MIL-STD-170 Sampling Procedures and Tables for Inspection by Attributes Moisture Resistance Test Cycle for Ground Signal and Electronic Test Equipment MIL-STD-202 MIL-STD-252 Classification of Visual and Mechanical Test Methods for Electronic a
8、nd Electrical Component Parts Defects for Equipment, Electronic, Wired and Other Devices MIL-STD-285 . Attenuation Measurements for Enclosures, Electromagnetic Shielding, for Electric Test Purposes, Method of MIL-STD-810 Envi ronmen ta 1 Test Met hods MIL-STD-1235 Single and Multilevel Continuous Sa
9、mpling Procedures and Tables for Inspection by Attributes DRAWINGS ELECTRONICS COMMAND SC-D-36423 SC-C-36424 sc-c-200154 SM-D-450462 SM-C-450466 SM-C-5555 15 SM-B-563756 SC-D-595509 SM-D-6 15264 DL-SC-A-621051 SM-D-781242 Hold Down Assembly Cable Assembly Keeper Panel Assembly, Emergency Exit Air Fi
10、lter Shock Mount Sealer Cover, Emergency Exit Intake Louver Assembly Modification Kit, Radio Frequency Door Fixture (S-280) Construction Interference, MK-I079/G Tightness Test L Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-552bE 54 977970b 0
11、222331 3 a a ,- SM-D-781243 SM-D-78 1244 DL-SM-D-947080 SM-D-947080 SM-D-9470 8 1 SM-D-947082 SM-D-947083 SM -D-g 4 70 84 SM-D-9 470 85 SM-D-947141 SM-D-947142 SM-D-947143 SN-D-947160 SM-D-947166 SM-D-947235 SM-D-947238 SM-C-947237 SM-B-947179 SM-B-947180 SM-D-947181 SM-B-947182 SM-B-947183 SM-B-947
12、184 SM-D-947186 SM-C-947230 Drain Fixture (S-280) Construction S-280 Construction Tightness Test Shelter, Electrical Equipment S-280C/G Shelter, Electrical Equipment S-280C/G Panel Assembly, Front Panel Assembly, Rear Panel Assembly, Roof Panel Assembly, Floor Panel Assembly, Side Corner, Lifting Ey
13、e (Machining) Corner, Towing Eye (Machining) Casting, Lifting to prescribed requirements. Except as otherwise specified in the con- -4.2 Classification of inspections.- The inspection requirements specified herein are classified asfollows: a. First article inspection (see 4.4). 12 Provided by IHSNot
14、 for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-S-5528bE 54 9999906 0222341 1 5 for every grade or type 5 for every grade or type 5 for every grade or type 5 for every grade or type 3 for every grade or type of urethane MIL-S-55286E(CR) b. Quality conformance i
15、nspection (see 4.5). (1) In-process (see 4.5.1). (2) Completed items (see 4.5.2). c. Methods of examination and test (see 4.6). d. Quality conPormance inspection of packaging (see 4.7). 3-3.1 3.3.1 3.3. 3.3. 3.3. 3.3. 4.3 Inspection conditions.- Unless otherwise specified, all shelters sub- mitted f
16、or quality conformance inspection shall be completely assembled. The final finish need not be applied until after the Group A, Group B, and Group C inspections have been performed on that shelter. prior to performance of the Group A, Group B, and Group C inspection, the final finish on the floor sha
17、ll not be applied until prior to final inspection. If the final finish is not applied until after the Group A, Group B, and Group C inspections, then those inspections related to the finish and marking shall be performed at final inspection. Unless otherwise specified, no other adjustment, additions
18、 or modifications -shall be made before or during test and inspection (see 4.5.2). If the final finish is applied 4.4 First article inspection.- Unless otherwise specified (see 6.1.b, 6.21, all first article test and inspections shall be performed by the contractor and shall consist of the following
19、 (see 3.2): 4.4.1 First article specimens.- The contractor shall provide and test the first article specimens listed in Table I. All specimens shall relflect mater- ial and conditions which will be used in production (see 6.2, Table II) Inspection Core material: Dens it y Compressive strength Shear
20、strengtrh Flammaiblity Water absorption TABLE I FIRST ARTICLE SPECIMENS I Quant it y Req t I Para Test Par a 4.6.1 4.6.1.1 4.6.1.2 4.6.1.3 4.6.1.4 4.6.1.5 .- 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b flIL-S-5528bE 5Y 777970b 0222342 3 Insp
21、ection Req t ! Test para para c Cleaning 3.4.2 4.6.4 Welding 3.4.3 4.6.5 MIL-S-55286E(CR) TABLE I. First Article Specimens Contd Inspection Adhesive Sealer Shock mounts Impact panel Hold down assembly Eye Casting Hardness Quantity I Test i 50 coupons 50 coupons SM-C-555515: 3 per -3 SM-C-947237: 3 e
22、ach SM-C-947230: 3 each 1 from wall, 1 from floor 1 complete 1 casting per SM-D-947143 3.3.2 3.3.3 3.3.4 3.4.4.1 3.8.1 3.6.4.2 4.6.2 4.6.2 4.6.3.1 4.6.7 4.6.32 4.6.24 4.4.2 First article shelter.- The contractor shall provide and test a first article shelter which shall reflect material and conditio
23、ns which will be used in production. Inspection shall consist of the inspections listed in Table II. Inspection shall be in the sequence listed in Table II. 4.5 Quality conformance inspection.- The contractor shall perform the in- spections specified under this paragraph. This does not relieve the c
24、ontractor of his responsibility for performing any additional inspection which is neces- sary to control the quality of the product and .to assure conipliance with all specification and drawing requirements. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
25、 IHS-,-,-MIL-S-552bE 54 m 7777706 0222343 5 MIL-S-55286E (CR) TABLE II. Sequence of first article inspection Contd - Inspection Lamination Interchangeability Riveting Construction tightness Finish Marking Dimensional Visual and Mechanical She1 t er weight Door latch torque Mo i stur e r es i stance
26、Temperature Thermal differential Rail transport Drops Construction Tightness - 2/ Towing, simulated Eye pulls Air transport, simulated Static door load Roof access steps Light tightness Electromagnetic interference suppression Watertightness Fording Door latch torque (second time) 1/ - Reqt par a 3.
27、4.4 3.4.6 3.4.7 3.7.1 3.4.8 3.4.9 3.4.1 3.8.2 3.4.10 3.5.1 3.5.2 3.5.3 3.6.1.1 3.6.2 3.7.1 3.6.3 3.6.4.1 3.6.1.2 3.6.5 3.6.6 3.7.3 3.7.4 3.7.5 3.7.6 3.7.2 3.7.2 Test par a 4.6.6 4.6.8 4.6.9 4.6.10 4.6.11 4.6.12 4.6.13 4.6.14 4.6.15 4.6.16 4.6.17 4.6.18 4.6.19 4.6.21 4.6.22 4.6.10.1 4.6.23 4.6.24.1 4
28、.6.25 4.6.26 4.6.27 4.6.28 4.6.29 4.6.30 4.6.31 4.6.16 _._- - I/ the end of this test (see 4.4.1). First Article specimen testing shall be completed no later than - 2/ For correlation data purposes only. as acceptheject criteria for the drop test. CTT test results are not to be used 15 Provided by I
29、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MlL-S-55286E (CR) shall then be reinspected per b. ?hile the interior differential pressure is maintained, every joint, rivet, rivnut, bolt, and any other area on the shelter exterior where two pieces interface shal
30、l be painted with a soap and water solution. There shall be no leaks, as evidenced by bubbling or spurting. rework shall be accomplished. shall not be considered as a failure of the construction tightness test unless said test was being performed in compliance with the Group A Audit requirement of T
31、able IV. after rework. If there is a leak(s), Detection and rework of leak(s) at this stage In any event, the reworked area(s1 shall be reinspected per 4.6.10 c. Inspection of the skid attachment areas shall not be performed on Group A Audit units, Also, latch keepers shall not be removed. 26 Provid
32、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-5 52 8 6E ( CR) 4.6.10.2 Door Portion.- After successful completion of the shelter portion per 4.6.10.1, the shelter shall be tested as follows (see Table IV): 4.6.10.2.1 Assembled Conditions.- No seala
33、nt caulking, tape, etc. shall be used on the doors except as detailed on the drawings. cover shall be completely assembled with all hardware and gaskets, shall be in- stalled on the shelter, and shall be closed and latched. The requirements of note 7 on drawing SM-D-947080 and the tightening instruc
34、tion on sheet 2 of draw- ing SM-D-450462 shall be met before proceeding with this test. The doors and louver 4.6.10.2.2 - Test Fixtures and Equipment.- This test requires the use of the items in 4.6.10.1.2.b, c, d, e, and g. 4.6.10.2.3 Performance - of Test.- The test fixture and equipment shall be
35、installed and/or assembled as required by drawing SM-9-781244. . Testing shall then proceed as follows: a. Clean, dry air shall be introduced into the shelter thru the drain fixture. The temperature differential between the pressurized air inside the shelter and the air outside the shelter shall not
36、 exceed 2.0 degrees F. Testing shall not proceed until the temperatures have stabilized within that limit. An interior differential pressure of 6.0 + 0.3 inches of water shall be achieved and maintained. If the shelter is unable to achieve and maintain that pressure the shelter shall be considered a
37、s having failed this test. The inspection of 4.6.10.2.3.b shall be performed, regardless of the pressure achieved, to locate the leak(s). The reworked area(s) shali then be reinspected per 4.6.10.2. Rework shall be accomplished. b. While the interior differential pressure is maintained, every a join
38、t, rivet, rivnut, bolt, hinge assembly, and any other area on the exterior of the doors and louver cover where two pieces interface shall be painted with a soap solution, except the gaskets and their bearing surface where air will be allowed to blow through. spurting. rework of leak(s) at this stage
39、 shall not be considered as a failure of the con- struction tightness test unless said test was being performed in compliance with the Group A Audit requiremenmt of Table IV. shall be reinspected per 4.6.10.2 after rework. There shall be no leaks, as evidenced by bubbling or If there is a leak(s), r
40、ework shall be accomplished. Detection and In any event, the reworked area(s) 4.6.10.3 Gasket Portion.- After successful completion of the door portion per 4.6.10.2, the gasket seating on the door and the emergency exit cover shall be tested as follows (see 3.6.5, Table IV): 4.6.10.3.1 Assembled Con
41、dition shall be as required in 4.6.10.2.1. 27 i- a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-552bE 5Ll 7779706 0222356 3 4.6.10.3.2 - Test Equipment.- This test requires the use of a piece of paper 0,005 inch maximum thickness by 2 1/2 i
42、nches wide. 4.6.10.3.3 Performance - of Test.- The center of the top and bottom of the door, 3 places along each side of the door, the center of the bottom of the cover, and 2 places along each side of the cover shall be inspected as follows: The door or cover shall be closed so that the paper is be
43、tween the weathergasket and its bearing surface (but not under the RFI gasket if so equipped). paper shall be withdrawn while the door or cover is closed. resistance to the withdrawal indicates that the gasket is not touching its bear- ing surface. increased in the appropriate manner and this inspec
44、tion shall be repeated. If a gasket(s) is unable to meet this inspection requirement without exceeding the requirements stated in 4.6.10.3.1 the shelter shall be considered as having failed this test, Rework shall be accomplished. The reworked area(s) shall then be reinspected per 4.6.10.2 and 4.6,1
45、0.3. The The absence of any If this condition is found, the gasket compression shall be 4.6.10.4 Construction Tightness Test Records.- The contractor shall main- tain records of all construction tightness tests performed, including any reinspections and tests performed in compliance with Group A Aud
46、it requirement of 4.5.2.1. Records shall contain, as a minimum, the shelter serial number and the following : 4.6.10.4.1 Shelter Portion: a. An indication of compliance with 4.6.10.1.1 and drawing SM-D- 781244. b. Temperature differential, interior differential pressure, and air flow per 4.6.10,1.3.
47、a. c. If any leak was found. d. Date inspection was performed. e. A statement that rework was performed, if applicable. f. Date reinspection was performed, if applicable. 4.6.10.4.2 Door Portion: a. An indication of compliance with 4.6.10.2.1 and drawing SM-D- 781244. b. Temperature differential and
48、 interior differential pressure per 4.6.2.3.a. 28 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-5528bE 54 m 9999906 0222357 5 . MIL-S-55286E (CR) c. If any leak was found. d. Date inspection was performed. e. A statement that rework was perfo
49、rmed, if applicable. f. Date reinspection was performed, if applicable. 4.6.10.4.3 Gasket Portion: a. An indicatipn of compliance with 4.6.10.3.1 and the 13 inspection location points per 4.6.10.3.3. b. If the shelter was equipped with RFI gaskets. c. If an inadequate gasket bearing was found and at what location. d. Date inspection was performed. e. A statement that rework was perform
