1、i i. - UIL-R-BL737B LO 7777706 0360LL7 6 su 3 9-0 3 - P Y -_ - Mll-R-8T9396 (AS) 28 March 1977 Superseding 16 August 1974 MIL-R-8 1939A (AS) MILITARY SPECIFICATION RACK, BOMB EJECTOR, AIRCRAFT; BRU01 O, BRU-1 1 ANP BRU-19 SERIES This specification is approved far use by the Naval Air Systems Command
2、, Department of the Navy, and is available for use by all departments and agencies of the Department of Defense. 1. SCOPE AND CLASSIFICATION 1.1 Scope. This specification establishes the requirements for the manufacture and inspec- tion of three types of bomb racks capable of carrying and releasing
3、stores having suspension lugs spaced 355.6 millimeters (14 inches) and 762 millimeters (30 inches) apart and weighing from 113.40 kilograms (250 pounds) to 1,814.36 kilograms (4,000 pounds). The test limits in this specification define minimum acceptable capabilities. 1.2 classification. Bomb ejecto
4、r racks, hereinafter called bomb racks, covered by this specification shall be of the following types: Type L Type II Type III BRU-1O/A or BRU-lOA/A Bomb Ejector Rack BRU-1 1/A or BRU-i lA/A Bomb Ejector Rack BRU-i9/A or BRU-l9A/A Bomb Ejector Rack 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. Th
5、e 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 5 I Military MI L-T-7743 Testing, Store Suspension and Release Equipment; General Specification for Beneficial commen
6、ts (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: z I :i i ENOINEERINO SPECIFICATIONS AND STANDARDS DEPARTMENT (CODE 93) NAVAL AIR ENOINEERINQ CENTER, LAKEHUR8T. N.J. 08733, by using the self-addressed Standardiza
7、tion Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. L - THIS DOCUMENT CONTAINS lb PAGES. - _. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b7 -_ MIL-R-L739B LO W 7999906 0360LL W . (Copies of speci
8、fications, standards, drawings, and publications 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- Order of precedence of specifications and standards. Should a conflict exist betwe
9、en any requirement in this specification and any requirement in the applicable documents referenced herein, the requirements of this specification shall take precedence over the referenced (applicable) document. 3. REQUIREMENTS 3.1 First article. The bomb racks furnished under this specification sha
10、ll be a product which has been inspected and passed the first article inspection specified herein (see 4.3). 3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIGSTD-143. * 3.3
11、Interchangeability. All parts having the same part number shall be directly and com- pletely interchangeable with each other with respect to installation and performance. - 2 MIL-R-819398 (AS) MIL-C-8 1842 Connector Assemblies for Bomb Rack Electric Fuzing Provisions Hooks, Bomb Rack, General Specif
12、ication for MIL-H-85042 STANDARDS Military MIL-STD- 1 O0 Engineering Drawing Practices MIL-STD-129 MIL-STD-130 Marking for Shipment and Storage Identification Marking of US. Military Property M IL-STD- 143 Standards and Specifications, Order of Precedence for the Selection of MIL-STD-704 Electric Po
13、wer, Aircraft, Characteristics and Utilization of MI L-STD-794 Parts and Equipment, Procedure for Packaging and Packing of MIL-STD-831 Test Reports, Preparation of MS3314 Lug, Suspension, 453.6 Kg (1,OOO lb.) class, Airborne Equipment DRAWINGS Naval Air Systems Command 1380540 Lug, Suspension, h3k 3
14、 Mod O * . -_ :*.* . .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-R-81939B LO m 7799906 03bOLL9 T m MIL-R-819396 (AS) 3.4 Identification of parts. Ali parts shall be marked as specified on the drawings listed in the data list for the bomb r
15、ack being procured, or in accordance with MIL-STD-130, if not specified on the drawings. The item identification and part number requirements of MIL-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 w
16、ith the drawings listed in the data list for the bomb rack being procured and as specified herein (see 6.2. lg). 3.5.2 Performance. The bomb racks shall satisfy all performance requirements when sub- jected to the following inspections in the order specified in Tables I and II. Electromechanical Com
17、ponent Inspection (4.6.1) Bomb Rack Inspection (4.6.2) Functional Test (4.6.3) Arming Mechanism (4.6.4) Electric Fuze Arming (4.6.5) Secondary Release (4.6.6) Manual Function (4.6.7a) Electrical Characteristics (4.6.7b) Lag Determination (4.6.7) High-g Release (4.6.7d) Sand (4.6.7e) Sait Spray (4.6.
18、70 Vibration Test (4.6.78) accordance with MIL-H-85042. a. b. C. d. e. f. g* h. i. j. k. 1. m. n. O. 3.6 Shock Test (4.6.7h) Life Test (4.6.7i) Static Test (4.6.7j) Lock Shut Firing (4.6.8) Bomb rack hooks. The construction and inspection of the bomb rack hooks shall be in 3 Provided by IHSNot for R
19、esaleNo reproduction or networking permitted without license from IHS-,-,-NIL-R-BL737B LO = 777770b 0360320 6 MIL-R-81939B (AS) 3.7 Electric fuze arming unit. The construction and inspection of the electric fuze arming unit shall he in accordance with MIL-C-81842. 3.8 , Workmanship. The workmanship
20、displayed in fabrication and assembly of the bomb racks 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 herein. Unauthorized repair, welding, heavy burrs, or parts asse
21、mbled by introduction of high stresses not prescribed in the drawings, are typical signs 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, s
22、hall be determinative of the requirements of the contract relative to workmanship. 4. 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 he
23、rein. Except as otherwise specified in the 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 reserves the right to perform any of the inspections set fort
24、h 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 racks shall be classified as follows: a. First article inspection (see 4.3) b. . Quality confo
25、rmance inspection (see 4.4) 4.3 First article inspection. First article inspection shall consist of all of the inspections listed in Table I. First articIe inspection report format shall be in accordance with MIL-STD-831 (see 6.3). 4.3.1 Sampling for first article inspection. First article bomb rack
26、 samples shall consist of the first two bomb racks manufactured on contract, The bomb racks shall be permanently labeled 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). 4.4 auality conformance inspecti
27、on. Quality conformance inspection shall coqsist 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). 4.4.1 Individual inspections. Individual inspectio
28、ns are those inspections canducted 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 ?or rejection of the bomb rack. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
29、se from IHS-,-,-a- MIL-R-L737B LO = 77777Ob 03bOL2L _ MIL-R-81939B (AS) TABLE I FIRST ARTICLE INSPECTIONS-SCHEDULE AND SEQUENCE 3 SPARE UNITS REQUIRED PER RACK TESTEDA SECONDARY RELEASE o TESTS Electroniechanical Component Inspection Bomb Rack Inspection Functional 3 Arming Mechanism Electric Fuze A
30、rming Manual Function Electrical Characteristics Secondary Release3 Lag Determination High-g Release Sand Salt Spray Vibration Shock Life Static Lock Shut Firing TEST PARAGRAPH 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5 4.6.7a , 4.6.7b 4.6.6 4.6.7 4.6.7d 4.6.7e 4.6.7f 4.6.7g 4.6.7h 4.6.7i 4.6.73 4.6.8 SAMPLE ”/
31、1 2 3 4 5 X 6 7 X 8 9 X X 10 X 11 /Inspection sequence is denoted by the numbers in the sample columns. An X denotes 2/ Spare units are applicable to Type II bomb racks only. See 6.2.lf. 3 This requirement is applicable to all Type II bomb rack inspections with the exception of inspection not requir
32、ed. arming mechanisms and electric fuze arming, The auxiliary release inspection of 4.6.31 is not applicable to Type III bomb racks. 5 I 3 4 X X 2 X X 5 X X 7 6 X 8 X Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ - MIL-R-81733B 10 m 7777706 0360
33、122 T m MI L-R-81939B (AS) TABLE II QUALITY CONFORMANCE INSPECTIONS-SCHEDULE AND SEQUENCE-/ 9 SPARE UNITS REQUIRED PER RACK TESTED AUXILIARY UNLOCK - - - - - SECONDARY RELEASE - - - - - TESTS GROUP 1 Electromechanical Component Bomb Rack Inspection Functional_4/ Arming Mechanism Electric Fuze Arming
34、 Inspection GROUP 2 Manual Function Electrical Characteristics Secondary Release.3 Lag Determination High-g Release Sand Salt Spray Vibration Shock Life Static Lock Shut Firing TEST PARAGRAPH 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5 4.6.7a 4.6.7.b 4.6.6 4.6.7 4.6.7d 4.6.7e 4.6.7f 4.6.78 4.6.7h 4.6.71 4.6.7j 4.
35、6.8 SAMPLE ALL SAMPLE5 J/ 1 2 3 4 AB 1x x1 2x 3x x2 4x 5x x4 x3 6X x5 7x CD 1x x1 xx xx x2 xx 2x xx xx 3x x3 xx I/Inspection sequence is denoted by the numbers in the sample columns. An X denotes inspection not required. 2/ Spare units are applicable to Type II bomb racks only. See 6.2.lf. g/ This r
36、equirement is applicable to all Type II bomb rack inspections with the exception of arming mechanisms and electric fuze arming. -!/ The auxiliary release inspection of 4.6.31 is not applicable to Type III bomb racks. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
37、nse from IHS-,-,-MIL-R-83939B 30 9999906 0360323 3 = MIL-R-81939B (AS 4.4.2 Sahipiing inspections. A random sampling of the bomb racks shall be selected by th procuring activity from each production lot in accordance with Table III and shall be subjected to th inspections listed in Table II, Group 1
38、 and Group 2. Group 1 inspections shall be conducted prior to Groul 2 inspections. Failure to.pass any of these inspections shall be cause for rejection of the entire lot (see 6.2.1 and 6.3). ITEM Bomb Racks TABLE 111 SAMPLING TEST ITEMS PRODUCTION LOT SIZE NUMBER OF SAMPLES 100 or Less 101 - 200 20
39、1 - 300 301 or More 2 3 4 I/ -!./ The procuring activity shall specify the number of samples, and the sequence of inspections each unit shall be subjected to for lots in excess of 300 units (see 6.2.le). 4.5 inspection conditions. Unless otherwise specified, all inspections shall be performec under
40、the foliowing conditions: a. Room temperature. Room ambient of 25f 10C (77f 18F) indicated. b. . Test temperature. All parts of the test item shall be stabilized at the specified temperaturl f2.8“C (f5F) indicated prior to conducting any tests. Unless otherwise specified, tempera ture stabilization
41、will have been attained when the indicated temperature of the surface of thl largest mass of the test item does not change by more than f2.8“C ( 6 Inspection methods. 4.6.1 Electromechanical component inspection, Type I I bomb rack. The following inspection shall be made during (when applicable) and
42、 after each of the tests conducted on the bomb rack as specified in Tables I and II, with the exception of 4.6.4 and 4.6.5. a. The Electromechanical Linear Actuator Assembly (In Flight Operable Bomb Rack Lock), hereinafter referred to as the IFOBRL, shall be electrically locked after cocking the lin
43、kage assembly of the bomb rack, unless otherwise specified herein. Unless otherwise specified, the IFOBRL shall be electrically unlocked just prior to each release of the linkage assembly, with or without a store suspended from the bomb rack.-The IFOBRL shall complete full travel (lock-to-unlock or
44、unlock-to-lock) in 2.2 to 4.5 seconds when operated electrically (20-30 VDC). This requirement is applicable to all environmental conditions specified herein. Proper operation of ,electrical and mechanical position indicators of the IFOBRL shall be verified for each cycle. b. Proper operation of the
45、 auxiliary unlock assembly indicator switch, which indicates actua- tion of auxiliary unlock assembly, shall be verified. 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 ensure that it has been properly ass
46、embled and adjusted, that the electrical connections are secure and that the workmanship is as specified herein (see 3.8). 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 requirements specified herein (s
47、ee 3.5.1). b. The bomb racks shall be examined to ascertain that the packaging conforms to the contract requirements (see 5). 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-R-81737B LO W 7777706 0360325 5 W MIL-R-81939B (AS) 4.6.3 Functional t
48、est. Each bomb rack, mounted in a horizontal position, shall complete the following tests. The auxi,liary release unit test of 4.6.31 shall be deleted when testing Type III bomb-racks. a. b. C, d. e. WARNING O The bomb rack shall not be cocked with the IFOBRL in the locked position or fired without
49、a reactive store load imposed on the ejector foot. With the ejector assembly mounted in the rack in any of the four positions, cock the bomb rack, latch all the hooks, and install the safety pin or lock the IFOBRL electrically, whichever is applicable. Verify that the release piston of the bomb rack ejector assembly is mechanically blocked from releasing the bomb rack and that the relief valve of the ejector as
