1、MIL-R-85895(A$: 28 MARCH 1988 MILITARY SPECIFICATION RACK, BOMB EJECTOR, AIRCRAFT BRU-32/A This specification is approved for use within the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. 1.1 man1 SCOPE Sco
2、pe. This specification establishes the requirements for the dfacture, testing, and acceptance of the BRU-32A bomb rack capable of carrying, releasing, and ejecting stores having suspension lugs spaced 14 inches and 30 inches apart. The BRU-32A bomb rack shall be utilized for carrying and forced ejec
3、tion release of stores weighing from 500 pounds to 2,600 pounds. The test units in this Specification define minimum acceptable requirements. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Comm
4、anding Officer, Naval Air Engineering Center, Systems Engineering and Standardization Department (SESD) Code 93, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1095 ,
5、Distribution Statement A. Approved for public release; distribution is unlimited THIS DOCUMENT CONTAINS “-1 7 PAGES. 7- Licensed by Information Handling ServicesMIL-R-85895 (AS) 2. APPLICABLE DOCUMENTS 2.1 Government Documents 2.1.1 Specifications and Standards. The following specifications and stan
6、dards form a. part. of this specifica.tion to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. SPECI
7、FICATIONS Military MIL-W-5088 MIL-T-7743 MIL-C-81842 MIL-H-85042 MIL-A-85046 MIL-A-85836 STANDARDS Military DOD-STD-100 MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-461 Wiring, Aerospace Vehicle Testing, Store Suspension, and Release Equipment, General Specification for Connector Assemblies for Bomb
8、Rack Electric Fuzing Provisions Hooks, Bomb Rack, General Specification for Actuator, Linear, Electromechanical Arming Unit, Zero Retention Force Engineering Drawing Practices Marking for Shipment and Storage Identification Marking of U.S. Military Property Standards and Specifications, Order of Pre
9、cedence for the Selection of Electromagnetic Emission and Susceptibility Requirements for the Control of Electromagnetic Interference Y MIL-STD-704 MIL-STD-794 Aircraft Electric Power Characteristics Parts and Equipment, Procedures for Packaging of 2 P Licensed by Information Handling ServicesMIL-R-
10、85895 (AS) MIL-STD-831 Test Reports, Preparation of MS-3314 Lug, Suspension, (1,000 lb. Class) Airborne Equipment MIL-B-5087 Bonding, Electrical, and Lightning Protection, for Military Aircraft 2.1.2 Drawings. The following drawing forms a part of this specification to the extent specified herein un
11、less otherwise specified, the issue shall be that in effect on the date of the solicitation. Naval Air Systems Command 1380540 Lug, Suspension, MK-3 Mod O (copies of specifications, standards, and drawings required by contractors in connection with specific acquisition functions should be obtained f
12、rom the contracting activity or as directed by the contracting activity.) 2.2 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this s
13、pecification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample(s) shall be subjected to first arti
14、cle inspection (see 4.3 and 6.3.1) 3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with the requirements of MIL-STD-143. 3.3 Interchangeability. All parts having the same part numb
15、er shall be directly and completely interchangeable with each other with respect to installation and performance. 3.4 Identification and marking. All parts shall be marked as specified on the drawings for the bomb rack (see 3.5.1); or in accordance with MIL-STD-130, if not specified on the drawings.
16、 The item identif.ication and part number requirements of DOD-STD-100 shall govern the part number and changes thereto. 3.5 Bomb Rack.- 3.5.1 Construction. The construction of the bomb rack shall be in accordance with the drawings listed in the data list for the bomb rack being procured and as speci
17、fied in the contract. 3 Licensed by Information Handling ServicesMIL-R-85875 LO W 7799706 0366L8L L MIL-R-85895 (AS) 3.5.2 Performance. The bomb rack shall meet the performance 0 requirements when subjected .to the following tests in the order specified in Tables I and II. a. b. C. d. e. f. g* h. i.
18、 j* k. 1. m. n. O. P* q* r. S* t. U. Bomb rack inspection (see 4.6.1) Functional (see 4.6.2) Arming unit (see 4.6.3) Electric fuze arming. (see 4.6.4) Manual operation (see.4.6.5.1) Electrical characteristics (see 4.6.5.2) Electromagnetic compatibility (see 4.6.5.3) Lag time determination (see 4.6.5
19、.4) Icing (see 4.6.5.5) Shock (see 4.6.5.6) Vibration (see 4.6.5.7) Sand (see 4.6.5.8) Temperature shock (see 4.6.5.9) High-g (see 4.6.5.10) Life (see 4.6.5.11) Stress corrosion (see 4.6.5.12) Humidity (see 4.6.5.13) Fungus (see 4.6.5.14) Lock shut firing (see 4.6.5.15). Static test (see 4.6.5.16) S
20、alt spray/altitude (see 4.6.5.17) 3.6 Requirements for parts. 3.6.1 Hooks. The construction and inspection of the hooks shall be in accordance with MIL-H-85042. Prior to installation into bomb racks, the hooks shall have met all of the first article and sampling requirements of MIL-H-85042. Licensed
21、 by Information Handling ServicesMIL-R-85895 (AS) 3.6.3 Mechanical Fuze Arming Unit. Two mechanical fuze arming units shall be in accordance with MIL-A-85836. 3.6.4 Electrical Fuze Arminq Unit, Electrical fuzing shall be in accordance with MIL-C-81842. 3.7 Electrical Bonding, The bomb rack shall mee
22、t the design requirements of MIL-B-5087. 3.8 Workmanshi . The workmanship displayed in fabrication and assembly of thds shall be such as to assure, within design limitations, the ability of the bomb racks to meet their performance requirements under all applicable environmental conditions specified
23、herein, The standards of workmanship exhibited in the approved first article sample, subject to any qualification stated in the governments notice of approval, shall determine the requirements of the contract relative to workmanship (see 4.6.1). 4. QUALITY ASSURANCE PROVISIONS 4,l Responsibility for
24、 inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facility suita
25、ble for the performance of the inspection requirements specified herein, unless disapproved by the government. The government reserves the right to perform any of the inspection set forth in this specification, where such tests are deemed necessary to assure that the supplies and services conform to
26、 prescribed requirements 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in th
27、e specification shall not relieve the. contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Samplingin quality conformance does not authorize submission of known defective material, either
28、indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: 5 Licensed by Information Handling ServicesY MIL-R-85875 LO W 7777706 0366183 5 m MIL-R-85895 (AS) a,
29、 First article inspection (see 4.3) b. Quality conformance inspection (see 4.4) 4.3 First article inspection. First article inspection shall consist of all the tests listed in Table 1. First article inspection report format shall be in accordance with MIL-STD-831 (see 6.2.2): - 4.3.1 Sampling for fi
30、rst article inspection. First article samples shall consist of the first two bomb racks manufactured on the contract. These samples shall be permanently labeled A and B for ease of identification. Failure of the bomb rack to pass any of the first article inspection shall be cause for rejection (see
31、6.3.1). 4.4 Quality conformance inspection. Quality conformance inspection shall consist of the following: a. Individual tests (see 4.4.1) b. Sampling tests (see 4.4.2) Quality conformance inspection report format shall be in accordance with MIL-STD-831 (see 6.3). 4.4,l Individual te.sts. Individual
32、 tests are those conducted on each bomb rack. Individual tests for the bomb rack are specified in Table II, Group I. Failure to pass any of these tests shall be cause for rejection of the bomb rack. 4.4.2 Sampling tests. A random sampling of the bomb racks shall be selected by the government represe
33、ntative from each production lot in accordance with Table III and shall be subjected to the tests listed in Table II, Group 1 and Group 2. These samples shall be identified as A, B, C, D. Group 1 tests shall be conducted prior to Group 2 tests. Failure to pass any of these test shall be cause for re
34、jection of the entire lot (see 6.2.1C and 6.3). 4.5 Test conditions. Unless otherwise specified herein, all tests shall be performed under the following conditions: a. Room temperature. Room ambient of 77 - t18OF. b. Test temperature. All parts of the test item shall be stabilized- at the specified
35、temperature +5OF indicated prior to conducting any tests. Unless otherwise specified herein, temperature stabilization will have been attained when the indicated temperature of the surface of the largest mass of the test item does not change by more than t5OF in a period of one hour. c, Swaybraces.
36、When tests require stores to be mounted to the bomb rack, swaybraces shall be used. Swaybraces shall be in the fully retracted ffnormalff -position during testing. 6 Licensed by Information Handling Services. MIL-R-85895 (AS) d. Test stores. The stores, as referenced herein by weight, shall conform
37、to the following parameters. The store suspension lugs shall be in accordance with MS3314 and Drawing 1380540. (1). The 500 pound store shall utilize applicable suspension lugs,.spaced 14 inches apart. Its diameter and center ,of gravity shall. I be based on the MK82 L.D.G.P. bomb. (2). The 1,000 po
38、und store shall utilize applicable suspension lugs, spaced 14 inches apart. Its diameter and center of gravity shall be based on the MK83 L.D.G.P. bomb. (3). The 2,000 pQund store shall utilize applicable suspension lugs, spaced 30 inches apart. Its diameter and center of gravity shall be based on t
39、he MK84 L.D.G.P. bomb. (4). The 2,600 pound store shall utilize applicable suspension lugs, spaced 30 inches apart. Its swaybrace contact points and center of gravity shall be based on a BRU-33/A loaded with two 83 L.D.G.P. bombs. e. Input power requirements. The bomb rack. shall perform satisfactor
40、ily under all applicable conditions specified herein from a 28 VDC rated voltage power source with characteristics and limits as defined in MIL-STD-704 except that the bomb rack shall operateover a range of 20 to 30 VDC measured at the bomb racks input connector(s). 4.6 Inspection 4.6.1 Bomb rack in
41、spection. Each bomb rack shall be inspected to ensure that it has been properly assembled, adjusted, electrical connections are secure, in accordance with appropriate drawings, and that the workmanship is as specified herein (see 3.8). 4.6.1.1 Qualification by analysis, inspection and demonstration.
42、 All requiremenmall be qualified by analysis, inspection or -demonstration acceptble to the procuring activity. 4.6.1.2 Packaging inspection. The packaging for each bomb rack shall be examinpe preparation for delivery conforms to this specification (see section 5). 4.6.2 Functional test. Each bomb r
43、ack mounted in a horizontal position shall pass the following tests: i a. Place the safety selector handle in the unlocked position. Close all the hooks, and then place the safety selector handle in the locked position. Verify that the indicator on the bomb rack side shows ttlockedat and that the tw
44、o cam position indicators are aligned in the latched position. Apply a 380 +20 inch-pound torque to the manual release bolt. The release mechanism shall not actuate. 7 Licensed by Information Handling Services-. MIL-R-85895 LO m 7777706 03bbL85 7 m MIL-R-85895 (AS) c. Place the.safety selector handl
45、e in the unlocked position, Close all the hooks, and then lock the bomb rack by operating the In- Flight Operable Bomb Rack Lock (IFOBRL) electrically. Verify that the IFOBRL operates smoothly. Verify that the indicator on the bomb rack side shows Illocked“, and that the two cam position indicators
46、are aligned in the latched position. Apply a 380 t20 inch-pound torque to the manual release bolt. The release mechanism shall not actuate. d. With both sets of hooks closed, unlock the bomb rack by operating the IFOBRL electrically. Verify that the IFOBRL operates smoothly. Verify that the indicato
47、r on the bomb rack side shows I1unlockedlt. Rotate the manual release bolt to open the hooks. The release mechanism shall operate smoothly. The torque required to rotate the manual release bolt shall be not greater than 360 inch pounds. Verify that the two cam position indicators have rotated approx
48、imately 90 degrees from their aligned position. e. With both sets of hooks closed, lock the bomb rack by operating the IFOBRL electrically. Unlock the bomb rack by operating the override electrically. Verify that the override linkage operates smoothly. Verify that the indicator on the bomb rack side
49、 shows Y.mlocked“. Rotate the. manual release bolt to open the hooks. The release mechanism shall operate smoothly, The torque required to rotate the manual release bolt shall not exceed 360 inch-pounds. Reset override mechanism by rotating safety selector handle counterclockwise towards the locked position .125 inches until override detent is released. f. With all hooks open, verify that swaybraces can be moved into the swaybrace housings with a force not to exceed 30 pounds. Close one set of hooks at a time. Verify that with either set of hooks closed the swaybrace assemblies c
