1、- MIL-H-85042A 30 m 777770b 0363358 2 -1 11 February 1983 SUPERSEDING MI L - H -8 5 04 2 ( AS ) 22 June 1976 MILITARY SPECIFICATION HOOKS, BOMB RACK, GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Air Systems Command Department of the Navy, and is available for use by
2、all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scopc. rack hook:;. capabilities. This specification covers the manufacture and inspection of bomb The test limits of this specification define minimum acceptable 1.2 Classification. Bomb rack hooks covered by this specification
3、 shall be of the following types: Type 1 BRU-12, BRU-14, BRU-15 and Aero 65 Series Bomb Rack Hooks Type II Type III Type IV Deleted Type v BRU-10 and BRU-11 (30-inch) Series Bomb Rack Hooks Type VI BRU-10 and BRU-11 (14-inch) Series Bomb Rack Hooks Type VI1 Type VI11 Aero 15 Series Bomb Rack Hook Ae
4、ro 7 and Aero 20 Series Bomb Rack Hooks Aero 1A Adapter Hook (forward) Aero 1A Adapter Hook (aft) Type IX Type x Type XI Aero 27 (30-inch) Series Bomb Rack Hook Aero 27 (14-inch) Series Bomb Rack Hook MK 8 Series Bomb Shackle Hook Beneficial comments, (recommendations, additions, deletions) and any
5、pertinent data which may be of use in improving this document should be addressed to the Naval Air Engineering Center, Engineering Specifications and Standards Department (Code 93) , Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearn
6、g at the end of this document or by letter. a. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t MIL-H-85042A 10 W 7799Oh 0363359 4 MI L-H -85O42A (AS) 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards and handbooks. U
7、nless otherwise specified, the fol1 owi ng specifications, standards and handbooks of the issue 1 i sted in that issue of the Department of Defense Index of Specifications and Standards (nonISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICA
8、T IONS MILITARY MI L- 1-6868 Inspection Process, Magnetic Particle STANDARDS DOD-STD-1 O0 Engineering Drawing Practices MIL-STD-I29 MI L-STD-130 Marking for Shipment and Storage Identification Marking of U.S. Military Property MIL-STD-143 Specifications and Standards, Order of Precedence for the Sel
9、ection of MIL -STD-794 MIL-STD-831 Test Reports, Preparation of Parts and Equipment, Procedures for Packaging and Packing of 2.1.2 Other Government documents, drawings, and publications, The following other Government documents, drawings, and publications form a part of this specification to the ext
10、ent specified herein. D RAN I N GS Naval Air Systems Command 81 1AS999 Data List, Test Fixtures, Type I Hooks 886AS1 O0 439AS250 Data List, Test Fixtures, Type II Hooks Data List, Test Fixtures, Type III Hooks 87 8AS400 Data List, Test Fixtures, Types Y and VI Hooks 881 AS1 O0 Data List, Test Fixtur
11、es, Types VI1 and VI11 Hooks 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-85042A( AS) (Copies of specifications, standards, handbooks, drawings, and pub1 ications required by manufacturers in connection with specific acquisition functions
12、should be obtained from the contracting activity or as directed by the contracting officer. ) 2.1.3 Order of precedence. this specification and the references cited herein, the text of this specification shall take precedence. In the event of a conflict between the text of 3. REQUIREMENTS 3.1 First
13、article. The bomb rack hooks, hereinafter called hooks, furnished under this specification, shall 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 commod
14、ities and services not specified herein shall be selected in accordance with MIL-STD-143. 3.3 Interchangeability. directly and completely interchangeable with each other with respect to instal lation and performance. 3.4 Identification of parts. All hooks shall be marked as specified on the drawing
15、for the hook being procured in accordance with MIL-STD-130, if not specified on the drawings, requirements of DOD-STD-100 shall govern the part number and changes thereto. 3.5 Construction. The construction of the hooks shall be in accordance with drawings for the hook being procured and as specifie
16、d herein (see 6.29). 3.5.1 machining of the hooks to prevent irregularities and tool marks on the hooks, especially in the throat area and inside the pivot hole. be longitudinal to the hook, and in no case across the throat of the hook. 3.6 Performance. The hooks satisfy all performance requirements
17、 when subjected to the following inspections in the order specified in Tables III and IV: All hooks having the same part number shall be The item identification and part number Machining and grinding of hooks. Care shall be exercised during the All arinding shall a. Inspection, Hooks (4.6.1 ) b. c.
18、Ultimate Load (4.6.3) d. Dynamic Load (4.6.4) Magnetic Particl e Inspection (4.6.2) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- flIL-H-850qZA 10 9777706 0363LbL 2 W DISTANCE ilxll IN INCHES PR ESTK ES S HOOK . LOAD TYPE U LT I MAT E DY NAM1 C
19、PRESTRESS (POUNDS) Type II O. 584 O. 584 0.584 - Type III 0.800 0.800 O. 800 - Type IX 0.737 O. 737 O. 737 20,600 Type x 0.737 0.737 0.737 16,500 Type XI I 0.437 0.437 O. 437 - - - MIL-H-85042A( AS) * 3.7 Prestressing of hooks. If required, to meet the dynamic loads (see 3.6), each hook, after final
20、 processing, may be subjected to a prestress load level (see 4.3.1 and 6.5) as detemined and recommended by the contracting activity. Determined prestress load values shall be considered valid only for the particular heat of steel used in the manufacture of those hooks subjected to prestress determi
21、nation. Any subsequent heat shall require determination of a new value. test fixture as specified in 2.1. This results in the load on the hook being concentrated on the lug bearing surface horizontally from the hook pivot hole centerline as shown in Table I. The prestress load on the hook shall be g
22、radually increased for a period of 1 minute, held at the actual prestress load for a minimum of 1 minutes and a maximum of one and one half minutes, and gradually unloaded over a period of 1 minute. Following prestressing, the hook shall be subjected to the magnetic particle inspection specified in
23、4.6.2. In the prestressing operation, the hook is to be held in a Type IX and X hooks shall be prestressed as shown in Table I. 3.8 Workmanshi The workmanship displayed in fabrication and assembly of the hooks + sha be such as to assure, within design limitations, the ability of the hooks to meet th
24、eir performance requirements under all applicable environmental conditions specified herein. Unauthorized repair, welding, heavy burns, or parts assembled by introduction of high stresses not prescribed in the drawings, are typical signs of inferior workmanship and shall be cause for rejection. The
25、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. 1 See figure 1 for illustration of “X“ distance 4 Provided by IHSNot
26、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ MIL-H-85042A LO W 9997706 0363162 II MIL-H-85042A( AS) FIGURE 1. Measurement of ilXtt Distance, 4. QUALITY ASSURANCE PROVISIONS (See 6.4) 4.1 Responsibi lity of inspection. Unless otherwise specified in the contract,
27、the contractor is responsible for the performance of all inspection requirements as specified herein. 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
28、 by the government. 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. The government reserves the right to perform 4.2 Classification of inspection. be classified as follows:
29、 The inspection of all types of hooks shall a. First article inspection (see 4.3) b. Quality conformance inspection (see 4.4) 4.3 First article Inspection. of the inspections listed in Table III. format shall be in accordance with MIL-STD-831 (see 6.3). First article inspection shall consist of all
30、First article inspection report 5 .- .-. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-850Ll2A LO 7777906 03633b3 h I MI L-H-85042A( As ) 4.3.1 Sampling for first article inspection and prestress level. Unless otherwise specified, as soon as
31、practicable after award of contract the contractor shall furnish hook samples to the approved government testing activity for first article test and the determination of a recommended prestress load level. manufactured on contract or purchase order. the tests specified in 4.6.1 and 4.6.2. Five sampl
32、es shall be subjected to the test specified in 4.6.3. Twenty samples shall be used for establishing a recommended prestress load and shall be tested to verify acceptable fatigue life (see 3.7) in accordance with 4.6.4. For data purposes, measurements as to the amount of stretching in the hook as a r
33、esult of the prestressing shall be made prior to the dynamic load test. No prestress loads are required for hook types I, V, VI, VI1 and VIII. types IX and X are provided in Table I. Failure of the hooks to pass any of the first article inspections shall be cause for rejection (see 6.2.1). 4.4 Qual
34、i ty conformance inspections. Quality conformance inspections consi st of those tests conducted on hooks submitted for acceptance under the contract or purchase order. Quality conformance inspection shall consist of the following inspections: The sample shall consist of the first 25 hooks All sample
35、s shall be subjected to Specific prestress load values for hook Acceptance of hooks shall be on an inspection lot basis. a. Individual inspections (se 4.4.1) b. Sampling inspections (see 4.4.2) Quality conformance inspection report format shall be in accordance with MIL-STD-831 (see 6.3). 4.4.1 Indi
36、vidual inspections. Individual inspections are those inspections conducted on each hook submitted in accordance with inspections listed in Table IV, Group 1. Failure to pass any of these inspections shall be cause for rejection of the hook. 4.4.2 Sampling inspections. A random sampling of three hook
37、s shall be selected by the procuring activity from each production lot, which shall consist of 100 hooks or less, and shall be subjected to the inspections listed in Table IV, Groups 1 and 2. Groups 1 inspections shall be conducted prior to Group 2 inspections. Failure to pass these inspections shal
38、l be cause for rejection of the lot. 4.5 Inspection conditions. Unless otherwise specified, all inspections shall be perforned under the fol 1 owi ng condi ti ons : a. Room temperature. Room ambient 25 - +lOC (77 - t18“F) indicated. b. Humidity. Room ambient. 6 Provided by IHSNot for ResaleNo reprod
39、uction or networking permitted without license from IHS-,-,-MIL-H-85092A 10 m 777770b 0363169 8 m MIL-H-85042A( AS) c. Load application. The following conditions shall apply when the hooks are subject to loading during prestressin (see 3.8 and 4.3.1), ultimate load (see 3.6) and dynamic load 9 see 3
40、.6): 1. All tests shall be applied vertically downward, normal to the hook 1 ug bearing surface. 2. All test loads shall be applied using the applicable test fixtures (see 2.1). NOTE Type IX, X, and XI test fixture drawings shall be obtained from the contracting activity (see 6.2). 3. Prestress, ult
41、imate and dynamic loads shall be applied as specified in Tables I and IL. 4.6 Inspection methods. Unless otherwise specified, the following inspections shall be performed on all types of hooks in the sequence shown in Tables III and IV. 4.6.1 Inspection, hooks. Each hook produced shall be thoroughly
42、 examined to assure compliance with 3.5. Any of the following defects shall be cause for rejection of that hook and, at the discretion of-the procuring activity, the entire related lot. a. One or more dimensions out of tolerance. b. Improper pl at i ng . c. Thickness of plating not in accordance wit
43、h the specified tolerance. d. Improper hardness level. e. f . Finish not in accordance with the specified values. Packaging not in accordance with contract or purchase order (see 5.). 4.6.2 Magnetic particle inspection. Each hook shall be subjected to magnetic particle inspections in accordance with
44、 MIL-1-6868. Magnetic particle inspections shall be performed after final machining, after heat treating, and after prestressing. Special attention shall be given to the throat area and pivot pin hole area of the hooks. Both the longitudinal and circular magnetization methods shall be used. A curren
45、t of 2,000 amperes minimum shall be applied for the circular magnetization method using a copper bar at the pivot pin hole and throat. A 2,000 ampere current shall also be used for the longitudinal magnetization method. There shall be no evidence of cracks, seams, discontinuity of surface or other d
46、etrimental defects in any region of the hook, except for surface indentations on the lug bearing surface which occur as a result of the prestress operation. prestress indentation line are acceptable. Chipping of the plating or any of the defects listed above shall be cause for rejection. Cracks in t
47、he plating along the 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-H-850LlZA 10 W 7777906 03b3165 T W MI L -H -8504 2A ( AS ) TABLE II. ULTIMATE TENSION LOADS, DYNAMIC LOADS AND CYCLE RANGES. HO OK TYPE Type 1 Type II Type III Type IV (Delet
48、ed) Type v Type VI Type VI1 Type VI11 Type IX Type x Type XI ULTIMATE LOADS (POUNDS ) 30,000 15,000 25,000 70,000 50,000 45,000 . 50,000 28,000 20,000 13,000 - CYCLES 150,000 75,000 250,000 300,000 150,000 250,000 250,000 250,000 150,000 25,000 DYNAMIC (POUNDS) 2,250 2,250 2,250 v 8,000 8,000 2,250
49、2,250 2,250 2,250 2,250 HIGH RANGE (POUNDS 7,750 7,750 7,750 12,000 12,000 7,750 7,750 7,750 7,750 7,750 TABLE II I. FIRST ARTICLE INSPECTIONS - SCHEDULE AND SEQUENCE. SEQUENCE AND NUMBER - I- Inspection, Hooks2 4.6.1 Magnetic Particle Inspection 4.6.2 U1 timate Load 4.6.3 Dynamic Load 4.6.4 Al 1 Al 1 5 20 1 Inspection sequence is as listed in the table. 2 If prestressing is required, it shall be accomplished after hook inspecti
