1、MIL-R-B1837 10 7777706 0360009 3 f- cs 0- - _- Mll-R-8 1839 (AS) 28 March 1977 MILITARY SPECIFICATION RACK, BOMB, AIRCRAFT; BRU-l2/A This specification is approved for use by the Naval Air Systems Command; Department of the Navy, and is available for use by all Departments and Agencies of the Depart
2、ment of Defense. 1. SCOPE , 1.1 Scope. This specification establishes the requirements for the manufacture and inspec- tion of one type of bomb rack capable of carrying and releasing 22.68 kilogram (50 pound) to 657.71 kilogram (1,450 pound) stores having suspension lugs spaced 355.6 millimeters (14
3、 inches) apart. The test limits in this specification define minimum acceptable capabilities. 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 speci.
4、fied herein. SPEC1 FICATIONS Military MIL-T-7743 Testing, Store Suspension and Release Equipment; General Specification for Hooks, Bomb Rack, General Specification for MIL-H-8 5042 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving thi
5、s document should be addressed to: ENGINEERINQ SPECIFICATIONS AND STANDARDS DEPARTMENT (CODE 931 NAVAL AIR ENQINEERINQ CENTER, LAKEHURST, N.J. 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter, THIS DOCU
6、MENT CONTAINS !a PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS Military MIL-R-1839 LO 9997906 03b001O T H MIL-STD- 100 Engineering Drawing Practices MIL-STD- 129 Marking for Shipment and Storage MILI-STD-130 MI L-STD- 143 Identific
7、ation Marking of US. Military Property Standards and Specifications, Order of Precedence for the = Selection of MIL-STD-704 Electric Power, Aircraft, Characteristics and Utilization of MI L-STD-794 Parts and Equipment, Procedures for Packaging and Packing of MIL-STD-831 Test Reports, Preparation of
8、MS3314. Lug, Suspension, 453.6 kg. (1,000 Ib) class, Airborne Equipment DRAWINGS Naval Air Systems Command DL909AS100 Data List, Test Fixture, BRU-12, 14, 15 and AERO 1A Adapter (Copies of specifications, standards, drawings, and publications required by suppliers in .connection with specific procur
9、ement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Order of precedence of specifications and standards. Should a conflict exist between any requirement in this specification and any requirement in the applicable documents referenced herein,
10、 the requirements of this specification shall take precedence over the referenced (applicable) document. 3. REQUIREMENTS e 3.1 First article. The bomb rack furnished under this specification shall be a product which has been inspected and passed the first article inspection specified herein (see 4.3
11、). 3.2 Selection of Specifications and standards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD-143. 3.3 Interchangeability. All parts having the same part number shall be directly and com- pletely interchangeabl
12、e with each other with respect to installation and performance. 3.4 Identification of parts. All parts Shall be marked as specified on the drawings listed in the data list for the bomb rack being procured, or in accordance with MIL-STD-130, if not specified on the drawings. The item identification a
13、nd part number requirements of MIL-STD-100 shall govern the part number and changes thereto. . 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-R-81839(AS) 3.5 . Bomb rack. 3.5.1 Construction. The construction of the bomb rack shall be in accor
14、dance with the drawings listed in the data list for the bomb rack being procured and asspecified herein (see 6.2.lf). 3.5.2 Performance, The bomb rack, shall satisfy all performance requirements when sub- jected to the following inspections in the order specified in Tables I and II. a. b. C. d. e. f
15、. h. j. k. 1. m. 3.6 Electromechanical Component Inspecion (see 4.6.1) Bomb Rack Inspection (see 4.6.2) Functional Test (see 4.6.3) Arming Mechanism (see 4.6.4) Electrical Characteristics (see 4.6.5a) Lag Determination (see 4.6.5b) High-g Release (see 4.6.5) Sand (see 4.6.5d) Salt Spray (see 4.6.5e)
16、 Shock (see 4.6.50 Vibration (see 4.6.58) Life (see 4.6.5h) Static (see 4.65) Bomb rack hooks. The construction and inspection of the bomb rack hooks shall be in accordance with MIL-H-85042. 3.3 Workmanship. The workmanship displayed in fabrication and assembly of the bomb rack shall be such as to a
17、ssure, within design limitations, the ability of the bomb rack to meet performance requirements under all applicable environmental conditions specified herein. Unauthorized repair, welding, heavy burrs, or parts assembled by introduction of high stresses not prescribed in the drawings, are typical s
18、igns of inferior workmanship and shall be cause for rejection. The standards of workmanship exhibited in the approved first article sample, subject to any qualification stated in the governments notice of approval, shall be determinative of the requirements of the contract relative to workmanship. 4
19、. QUALITY ASSURANCE PROVISIONS (see 6.4) 4.1 Responsibility for inspection. Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirements as Specified herein. Except as otherwise Provided by IHSNot for ResaleNo reproduction or networking
20、 permitted without license from IHS-,-,-MIL-R-8 specified in MIL-R-G-839 LO b 0360032 3 M 839(AS) he contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the government. The government res
21、erves the right to perform any of the inspections set forth in the specification, where such inspections are deemed necessary to assure that the supplies and services conform to prescribed requirements. 4.2 Classification of inspection. The inspection of the bomb rack shall be classified as follows:
22、 a. b. First article inspection (see 4.3) Quality conformance inspection (see 4.4) 4.3 First article inspection. First article inspection shall consist of all of the inspections listed in Table I. First article inspection report format shall be in accordance with MIL-STD-831 (see 6.3). TABLE I FIRST
23、 ARTICLE INSPECTIONS - SCHEDULE AND SEQUENCE -.!/ TESTS Electromechanical Component Inspection Bomb Rack Inspection Functional Arming Mechanism Electrical. Characteristics Lag Determination High-g Release Sand Salt Spray Shock Vibration Life Static _ _ TEST PARAGRAPH 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5a 4
24、.6.5b 4.6.5 4.6.5d 4.6.5e 4.6.5f 4.6.58 4.6.5h 4.6.5i SAMPLE See 2 1 2 3 X 4 X 5 6 X x 7 X L/ Inspection sequence is denoted by the numbers in the sample columns. An X denotes inspection not required. This requirement is applicable to all bomb rack inspections with the exception of arming mechanisms
25、. 4 _ _- ,-.-I-/-, 1 2 3 4 X 5 X X 6 7 X 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-R-l39 i0 7797706 0360033 5 W MI L-R-81839(AS) 4.3.1 Sampling for first article inspection. First article bomb rack samples shall consist of the first two
26、 bomb racks manufactured on contract. The bomb racks shall be permanently labeleti A and B for ease of identification. Failure of the bomb racks to pass any of the first article inspections shall be cause for rejection (see 6.3). TABLE II QUALITY CONFORMANCE INSPECTIONS - SCHEDULE AND SEQUENCE* TEST
27、 TESTS PARAGRAPH GROUP 1 Electromechanical Component Inspection 4.6.1 Bomb Rack Inspection 4-6.2 Functional 4.6.3 Arming Mechanism 4.6.4 GROUP 2 Electrical Characteristics Lag Determination High-g Release Sand Salt Spray Shock Vibration Life Static 4.6.5a 4.6.5b 4.63 4.6.5d 4.6.5e 4.63 4.6.58 4.6.5h
28、 4.65 SAMPLE All Samples See Y 1 2 3 1 X X x4 4x X C X X X X 1 X X 2 X - - - D 1 X 2 X X X x X 3 - - /Inspection sequence is denoted by the numbers in the sample columns. An X denotes . inspection not required. 2/ This requirement is applicable to all bomb rack inspections with the exception of armi
29、ng mechanisms. 4.4 Quality conformance inspection. Quality conformance inspection shall consist of the following inspections: a. Individual Inspections (see 4.4.1) b. Sampling Inspections (see 4.4.2) Quality conformance inspection report format shall be in accordance with MIL-STD-83 1 (see 6.3). 4.4
30、.1 Individual inspections. Individual inspections are those inspections conducted on each bomb rack. Individual inspections for the bomb racks are shown in Table II, Group 1. Failure to pass any of these inspections shall be cause for rejection of the bomb rack. . _. - 5 Provided by IHSNot for Resal
31、eNo reproduction or networking permitted without license from IHS-,-,- NIL-R-1837 LO 7777706 03b0014 7 MIL-R-81839(AS) 4.4.2 Sampling inspections. A random sampling of the bomb racks shall be selected by the procuring activity from each production lot in accordance with Table III and shall be subjec
32、ted to the inspections listed in Table II, Group I and Group 2. Group 1 inspections shall be conducted prior to Group 2 inspections. Failure to pass any of these inspections shall be cause for rejection of the entire lot (see 6.3). TABLE 111 SAMPLING TEST ITEMS t PRODUCTION ITEM LOT SIZE NUMBER OF S
33、AMPLES Bomb Racks 100 or Less 2 101 - 200 3 201 - 300 4 301 or More 2 3The procuring activity shall specify the number of samples, and the sequence of inspec- tions each unit shall be subjected to for lots in excess of 300 units (see 6.2.le). 4.5 inspection conditions. Unless otherwise specified, al
34、l inspections shall be performed under the following conditions: a. Room temperature. Room ambient of 25flO“C (77f 18F) indicated. b. Test temperature. All parts of the test item shall be stabilized at the specified temperature f2.8“C (f5“F) indicated prior to conducting any tests. Unless otherwise
35、specified, tempera- ture 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 k2.8“C (f5“F) in a period of 1 hour. C. Test fixture. Whenever tests require that a store be mounted to a bomb rack, a fixtur
36、e shall be utilized which is in accordanc with DL909AS100. All swaybrace adjustments shall be in accordance with this data list. This configuration is for test purposes only. d. Test stores. Unless otherwise specified in the applicable paragraph, the lightest store shall be 45.81 kilograms (101 poun
37、ds) and the heaviest store shall be 657.71 kilograms (1,450 pounds). The stores shall conform to the following parameters: All store suspension lugs shall be in accordance with MS3314 and shall be spaced 355.6 millimeters (14 inches) apart. The 45.81 kilogram (101 pound) store shall have a center of
38、 gravity located midway between the suspension lugs and 139.7 millimeters (5 1/2 inches) below the hook bearing surface of each suspension lug. The other stores shall have centers of gravity located midway between the suspension lugs and 203.2 millimeters (8 inches) below the hook bearing surface of
39、 each suspension lug. e. Input power requirements. The bomb rack shall perform satisfactorily 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 operate over a range of 2
40、0 to 30 VDC, measured at the bomb racks input connector(s). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-81839 10 97999Ob 03b0015 9 MlL-R-81839(AS) 4.6 Inspection methods. 4.6.1 Ele6tromechanical component inspection. The following inspect
41、ions shall be made during (when applicable) and after each of the inspections conducted on the bomb rack, as specified in Tables I and II, with the exception of 4.6.4. 4.6.1 .I BQmb rack operation. Proper operation of the cocked indicator and transfer switches of the Actuator, Linear, Electromechani
42、cal, hereinafter referred to as the LEMA, shall be verified in accordance with 4.6.3. le. The voltage shall be as specified in the applicable inspection. 4.6.2 Bomb rack inspection. The bomb rack shall be inspected as follows: 4.6.2.1 Individual .inspections. Each bomb rack shall be inspected to ens
43、ure that it has been properly assembled and adjusted, that the electrical connections are secure and that the workmanship is as specified herein (see 3.7). 4.6.2.2 First article and quality conformance inspections. a. Each bomb rack shall be thoroughly examined to determine conformance to all of the
44、 requirements specified herein (see 3.5. i). b. The bomb racks shall be examined to ascertain that the packaging conforms to the contract requirements (see 5). 4.6.3 Functional test. 4.6.3.1 Bomb rack. The following test shall be performed on each bomb rack in the sequence listed. a. With the bomb r
45、ack unloaded, cock the LEMA and linkage assembly and latch the hooks. Verify that there is free play between the bell crank and LEMA and that the linkage assembly is properly cocked and the hooks securely Iatched. b. Insert the latch check pin assembly, hereinafter referred to as the safety pin, in
46、the safety pin hole. C. Manually attempt to move the bell crank forward. The hooks shall remain securely cocked and latched. d. Recock the linkage assembly, if necessary. e. Apply rated voltage to the LEMA. The LEMA shall uncock but its cocked indicator switch shall remain closed. Remove the rated v
47、oltage, The cocked indicator switch shall open. No current shall flow through the transfer switch until re-application of rated voltage. The linkage assembly and hooks shall remain secureIy latched, f. Cock the LEMA and linkage assembly, if necessary. g. Remove the safety pin from the safety pin hol
48、e. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-1839 10 999930b 03b0016 O 9 h. 1. j. k. 1. m. n. O. 4.6.4 Manually move the bell crank forward to release. Both hooks shall fully open. Repeat a. Apply rated voltage to the LEMA. Both hooks sha
49、ll open fully. The LEMA shall function as in t. Cock the LEMA and linkage assembly. The hooks shall remain open. Verify that there-is free play between the bell crank and LEMA and that the linkage assembly is properly cocked. Insert the safety pin in the safety pin hole. Latch a 657.71 kilogram (1,450 pound) store to the bomb rack, latching the hooks securely. The store and sway
