1、 MIL-U-55325 58 U 7777906 0365503 O , .1 !I MILITARY SPECIFICATION MOUNTING MT-3802( )/ARC 3-4 +47 / MI L-M-55325 ( EL) 9 September i970 1. SCOPE 1.1 This specification covers one type of mounting equipment is mounted for vibration isolation, and is des MT-3802( )/ARC. (See 6.1 and 6.5) 2. APPLICABL
2、E DOCUMENTS upon which cipher gnated Mounting 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 Box , Fi berboard PPP- P- 29 1 PPP-S - 760 PPP-
3、T-45 PPP-T-97 IC PPP-F-320 Fiberboard, Corrugated and Solid, Sheet Stock (Container Grade) and Cut Shapes Paperboard ,. Wrapping, Cushioning Strapping , Nonmetal 1 i c, (and Connectors) Tape, Gummed, Paper, Reinforced and Plain, for Sealing and Securing Tape, Pressure Sens i ti ve Adhesive, Fi lamen
4、t Reinforced MI LI TARY MIL-P-116 Preservation , Methods of MI L-C- 172 MIL-E-5400 Electronic Equipment, Aircraft, General MIL-T-5422 MIL-F-14072 Cases, Bases, Mounting and Mounts , Vi brati on Speci fi cati on for Electronic Equipment Tes ti ng , Envi ronmental , Ai rcraf t Finishes for Ground Sign
5、al Equipment MIL-M-13231 Marking of Electronic Equipment FSC 5810 THIS DOCUMEMB CONTAINS PAGES. - _ b Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-55325( EL) STANDARDS MI
6、L ITARY MI L-STD- 1 05 MIL-STD-129 MIL-STD-147 MIL-STD-252 Wired Equipment, Classification of MIL-STD-454 Standard General Requirements for MIL-STD-810 Environmental Test Methods Sampl i ng Procedures and Tab1 es for Inspection by Attributes Marking for Shipment and Storage Pal letized and Container
7、ized Unit Loads 40 in. x 48 in. in Pallets, Skids, Runners, or Pallet Type Base Visual and Mechanical Defects Electronic Equipment (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the proc
8、uring activity or as directed by the contracting officer, requesting copies). Both the title and number or symbol should be stipulated when , 3. REQUIREMENTS 3.1 Description. - Mounting MT-3802( )/ARC consists of an upper and I- lower plate separated by four isolator mounts, The two plates are elect
9、rically connected through grounding straps. upper plate of the mount by the rear retainer assembly and the front self locking retainer assembly. The mounting provides vibration isolation and mounting facilities for equipment used in both rotary and fixed wing aircraft. with the following drawing and
10、 data list: preproduction samples of unit(s) on order for approval, if required by the invitation for bids and contract. The cipher equipment is secured to the 3.2 Construction. - The unit(s) on order shall be constructed in accordance 3.3 Preproduction samples. - The contractor shall furnish three
11、(3) DL SM-A-349414 and DL SM-A-349415 (See 4.3 however, final acceptance and shipment will be withheld until the Group C reinspection results have shown that the corrective acti on was effective. 4.5.6 Reinspection of conforming Group C sample units. - Unless otherwise specified, sample units which
12、have been subjected to and passed Group C inspection may be delivered on the contract or order, provided all damage is repaired, cleaned of all foreign matter, and the sample units are resubjected to and pass Group A inspection. 4.6 Service conditions test. - The unft(s) shall be tested in accordanc
13、e with Specification MIL-T-5422, except as otherwise specified. service condition requires a performance check, the unit(s) shall meet the requirements of 3.15 Unit(s) shall pass a visual and mechanical inspection after the conclusion of the temperature-al ti tude, humidity , fungus and salt spray t
14、ests. When any No defects shall be allowed. 4.6.1 Temperature-altitude combination. - The unit(s) shall be tested in accordance with MIL-T-5422 Curve A to determine compliance with 3.10.1. 4.6.2 Relative humidity. - The unit(s) shall be subjected to the 4.6.3 Fungus. - The unit(s) including accessor
15、ies shall be subjected humi di ty test of MIL-T-5422 to determi ne compli ance with 3.1 O .2. to 28 days of the fungus test specified in Method 508 of MIL-STD-810. The parts andmaterials of the chassis shall be sprayed with the spore suspension, The unit(s) shall be subjected to the test and as spec
16、ified for compliance with 3.10.3. 4.6.4 Salt spray, - The unit(s) including accessories shall be exposed in its normal operating condition to salt spray in accordance with MIL-T-5422. The unit(s) shall not be required to be operated. The unit(s) shall meet the requirement of 3.10.4. 4.6.5 Vibration.
17、 - The unit(s) shall be tested in accordance with Curve IV, MIL-T-5422 for helicopters and aircraft and meet the vibration transmissibility requirements per MIL-C-172 as modified per drawing SM-C-349413. 4.6.6 Shock, Equipment. - .The unit(s) shall be subjected to the shock tests of Specification MI
18、L-T-5422. 30 G Crash Safety Test and shall meet the requirements of 3.70.6. These tests shall include the 4.7 Bonding test. - The d-c resistance shall be measured with an instrument having an accuracy of 21.0 percent. The unit(s) with the bonding 9 .- -_. , :. . . 1 II - . I Copyright Communications
19、 - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-55325( EL) straps in place shall be mounted on a flat, bare-metal plate in a manner comparable to actual aircraft installation. The resistance shall
20、be measured between the holding devices and the metal plate. The requirements of 3.11 shall be met. 4.8 Sway space and snubbing test. - The unit(s), with minimum rated load amlied. shall be sub.iected to a force extending through the center of graiity of the unit(s),-along each of its three principa
21、l axes, in turn. This force shall be seven and one-half times the maximum weight of the unit(s). At the conclusion of each application of force there shall be no damage to the unit($) and the requirements of 3.12 shall be met. 4.9 Inspection for dimensional interchangeability. - All mechanical dimen
22、sions specified on the drawings shall be measured to determine compliance with physical interchangeability requirement of 3.14. When a dimension is not within specified or design limits, it shall be considered a major defect. 4.10 Visual and mechanical inspection. - Workmanship shall be inspected in
23、 accordance with Standard MIL-STO-252. 4.11 Operational inspection. - Depress the upper plate of the unit with a uniform force (18 to 24 pounds) the isolators shall compress. Remove the uniform force, the upper plate shall return to its no load position and be parallel with the bottom plate. The req
24、uirements of 3.15 shall be met. 4.12 Quality conformance inspection of preparation for delivery. Preparation for delivery shall be inspected in accordance with Specification - MIL-P-176 to determine conformance to the packaging requirements of Section 5. handling test in accordance with Specificatio
25、n MIL-P-116 is required by the contract the operational inspection test 4.12, shall be conducted to determine freedom from operational malfunction caused by rough handling. 4.13 Rough handling test (preparation for delivery). - When rough I 5. PREPARATION FOR DELIVERY 5.1 Preservati on and packagi n
26、 Level A or C as specified. (See 6.1 - Preservati on and packaging shall be 5.1.1 Level A. - 5.1.1.1 accordance with process C-1 of MIL-P-116. Cleaning_. - Each Mounting MT-3802( )/ARC shall be cleaned in 10 .i o Copyright Communications - Electronics Command Provided by IHS under license with CRAIN
27、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r MI L-M-55325( EL) 5.1.1.2 Drying. - Each Mounting MT-3802( )/ARC shall be dried in accordance with the applicable procedure of MIL-P-116. . 5.1.1 .3 Preservati on appl i cati on. - None requi red. 5.1.7.4 Unit acka i
28、n . - Unit packaging shall be in accordance with 5.1 .1.4 1 Techni cal 1 i terature, - Each techni cal 1 i terature shal 1 be 5.1.1.4.2 Mounting MT-3802( )/ARC. - Each Mounting MT-3802( )/ARC the methods prescri _gI_QQ ed in MIL-P-116 as specified herein. packaged method lC-l. shall be packaged Meth
29、od III as follows: in paperboard conforming to Type 1 of Specification PPP-P-291. The wrapping shall be secured by tape, Type III conforming to PPP-T-45. cushioned item within a close-fitting fiberboard box conforming to PPP-B-636, W6c weather resistant, place the technical li terature packaged as s
30、pecified in 5.1.1,4.1 in the box directly under the lid of the box, box closure shall be as specified in the appendix of the box specification. above, shall be pl aced in i ntermedi ate containers confomi ng to PPP-B-636 W5c weather resistant. shall have minimum cube and tare, shall contain multiple
31、s of five units, and shallriot exceed ten pounds each. Such containers shall be closed as provided in the appendix to the box specification. 5.1.2 Level C. - Each Mounting MT-3802( )/ARC shall be packaged in a manner thamafford adequate protect1 on against corrosion, deterioration, and damage during
32、 shipment from the supply source to the first receiving activity , Cushion each mounting by wrapping Place the 5.1.1.4.3 intermediate packaging. - Unit packages, prepared as Such containers shall be uniform in size and shapes, 5.2 Packing. - Packing shall be Level A, B or C as specified. (See 6.2b)
33、5.2.1 Level A. - 5.2.1.1 in 5.1.1.4.3 shall be placed on a pallet, Load Type 1, conforming to MIL-STD-147. sides extending down the stacked load at least 12 inches to accomodate marking requirements. The cap shall be fabricated of fiberboard conforming to PPP-F-320, class weather resistant W5c. The
34、load shall be “banded” to the pal let by s trappi ng . Palletized load. - A quantity of items packaged as specified A fiberboard cap shall be employed over the load having two 11 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or ne
35、tworking permitted without license from IHS-,-,-MIL-M-55325( EL) 5.2.1.3 Less than palletized load.- When quantities per destination or less than a pallet load, a quantity of items packaqed as specified in 5.1.1.4.3 shall be packed within a clse-fi tting fiberboard by conforming to PPP-B-636, weathe
36、r-resistant. Closure shall be in accordance with the appendix of the box specification. strapping or pressing sensitive filament tape banding conforming to PPP-S-760, Type II or PPP-T-97, Type IV respectfully, selection of the material and appl i cati on shall be in accordance with the appendix of t
37、he box specif i cati on. Reinforcing shall be by nonmetallic 5.2.2 Level B. - A quantity of Mountings MT-3802( )/ARC as specified in 5.1 shall be packed as specified in 5.2.1. 5.2.3 Level C. - A quantity of Mountings MT-3802( )/ARC packaged as specified in 5.1, shall be packed as specified in 5.2.1
38、except that pallets, fiberboard boxes and fiberboard caps shall be of the type, size, commonly used for the purpose and shall comply with the rules and regulations of the comnand carrier as applicable to the mode of transportation. Packing shall be accomplished in a manner that will afford adequate
39、protection to the packages and its contents during shipment from the supply source to the fi rst receiving acti vi ty . 5.3 Marking. - In addition to any special marking required by the contract or order, interior packages and exterior shipping containers shall be marked in accordance with MIL-STD-1
40、29. 6. NmES 6.1 Intended use. - Mounting MT-3802( )/ARC is intended to be used to provide vibration isolation and mounting facilities for security equipment when installed in fixed or rotary wing aircraft. 6.2 Ordering data. - Procurement documents should specify the following: a. Title, number, and
41、 date of this specification and any amendment thereto. b . Levels of preservation, packaging , and packing requi red, (Level A, Level B, or Level C) . c. The specific paragraphs of Section 5 which are applicable to the parti cul ar procurement. d. Preproduction i nspecti on : 12 Copyright Communicat
42、ions - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-55325( EL) (1) Three (3) sample units of each item cited in Section 1 are generally required so that lengthly environmental tests can be complete
43、d on specified sample units while complete performance measurements can be made on one sample unit. (See 3.3) (2) Preproduction pack(s) as follows: Makeup of pack(s). Number of each kind of pack to be submitted. Inspection to be performed thereon, (including rough handling). e. Marking and shipping
44、of sample. f. Place of final inspection. g ,. Techni cal 1 i terature required. h. Quantity of spare parts required. i. Submission of the statement of treatment referenced in 3.9 should be sixty (6) days after award of contract. This statement should be sbmi tted to the contract1 ng off i Cer. 6.3 _
45、Group C inspection. - Approval to ship unit(s) on order may be withheld, at the discretion of the Government pending decision from the procuring activity, until compliance with 4.5.4.1 is-complete. 6.4 Location of operational inspection. - it is desirable that the operational inspection 4.12 be perf
46、ormed at a location that will minimize handling (which might cause damage to the units) after this inspection. is recommended that the entire lot (including the sample units) be inspected immediately prior to packaging. 6.5 Nomenclature. - The parentheses in the nomenclautre will be deleted or repla
47、ced by a letter identifying the particular design; for example: MT-3802W/ARC. with the applicable clause in the contract. It The contractor should apply for noemnclature in accordance (See 1.1) 6.6 Definttion of Level B. - Level 5 packaging requirements detailed herein are designed to furnish protec
48、tion against corrosion, deterioration, and physical damage during domestic shipments; covered storage for a period of three years or less; and distribution within the continental limits of the United States. 6.7 Dimensional data. - Dimensions of packaging materials in the Bill When dimensions of the
49、 items vary, the dimensions of the packaging of Materials Table are based on the dimensions of the equipment cited in the table. materials shall be adjusted accordingly . 13 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. - . .- / MIL-1-55325 58 7777706 OLb55Lb 7 - - I ! - MIL-M-55325( EL) 6.8 Verification inspection. - Verificatio
