1、c -15- 7g MIL-T-2342bD 17 9999906 0192541 O TYPE I II III MIL-T-23426D(AS) 27 Oc tober 1986 TYPE OF NAEC BREAK1 NG MATERIAL OR PART STRENGTH PROCESS NUMBER POUNDS NEWTONS Hol 1 ow Bar 502822-4 . 28,500 2 1500 126,774 5 6,672 Solid Bar 51 3436-1 36,200 2 1500 161,025 5 6,672 41 3745-1 38,000 2 1500 1
2、69,032 6,672 41 7599-1 53,000 2 1500 235,755 2 6,672 506409- 1 63,000 2 1890 280,237 5 8,407 5087 1 3- 1 63,000 2 1890 280,237 5 8,407 - .- - -. . Forging 51 7891 -1 46,453 2 1353 206,632 2 6,018 Superseding 30 June 1978 MIL-T-23426C(AS) MILITARY SPECIFICATION TENSION BAR/RELEASE ELEMENT, AIRCRAFT L
3、AUNCHING 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 .r 1. SCOPE 0 1.1 Purpose. This specification covers requirements for the procurement of tension bars
4、/release elements (TBIRE) of the types and part numbers shown in 1.2. are referred to as release elements. Frangible elements that are used to launch nose gear launch aircraft 1.2 Classification. The tension barIrelease element (TB/RE) shall be classified by type as follows in Table I: Beneficial co
5、mments (recommendations, additions, deletions) and any pertnent data which may be of use in improving this document should be address to: NAVAL AIR ENGINEERING CENTER, SYSTEMS ENGINEERING AND STANDARDIZATION DEPARTMENT (CODE 93), Lakehurst, NJ 08733-5100, by using the self-addressed Standardization
6、Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 0 AMSC N/A THIS DOCUMENT CONTAINS 23 PAGES. FSC 1720 DISTRIBUTION STATEMENT A. Approved for pub1 ic release; distri bution is un1 imi ted. Provided by IHSNot for ResaleNo reproduction or networking permi
7、tted without license from IHS-,-,-MIL-T-2342bD 17 W 77777Ob 0172542 2 MI L-T-2 3426D (AS) 2. APPLICABLE DOCUMENTS 2.1 Government Documents. 2.1.1 Specifications and Standards. The following specifications and standards form a part of this specification to the extent specified herein. Unless otherwis
8、e specified, the issues of these documents shall be those listed in the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS Federal L- P- 378 P-D-680 TT-L-32 PPP-B-636 PPP-B-640 PPP-F-320 Mi 1 i tary MIL-P-116 MI L-S-
9、5000 MIL-S-6758 MIL-H-6875 MI L-F-7 1 90 MIL-S-8699 MI L-C- 1 5074 MIL-P-23377 MIL-L-35078 STANDARDS Federal FED-STD-151 FED-STD-595 Military . MIL-STD-129 MIL-STD-147 Plastic Sheet and Strip, Thin Gauge, Polyolefin Dry Cleaning Solvent Lacquer, Cellulose Nitrate, Gloss and Aircraft Use Box, Shippin
10、g, Fiberboard Box, Fi berboard, Corrugated, Tri pl e-#al 1 Fi berboard, Corrugated and Sol id, Sheet Stock (Contai ner Grade) and Cut Shapes Preservation, Methods of Steel, Chrome-Ni ckel-Molybdenum (E4340) Bars and Reforging Stock Steel, Chrome-Molybdenum (41 30) Bars and Reforging Stock (Ai rcraf
11、t Qual i ty) Heat Treatment of Steel, Process For Forging, Steel, for Aircraft and Special Ordnance Appl i cations Steel Bars and Forging Stock (4330) Vanadium Modified, Ai rcraf t Qual i ty Corrosion Preventive, Fi ngerpri nt Remover Primer Coating, Epoxy Polyamide, Chemical and Solvent Res i s tan
12、 t Load Unit, Preparation of Nonperishable Subsistence Items, General Specification For . Metals, Test Methods Col or Marking fori Shipment and Storage Palletized Unit Loads 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2342bD 17 7777906 03
13、72543 4 W MIL-T-23426D(AS) Mi 1 i tary MI L-STD-41 O Nondestructive Testing Personnel Qualification and MI L-STD-414 Sampling Procedures and Tables for Inspection by Variables MIL-STD-1944 Inspection, Magnetic Particle MI L-STD-6866 Inspection, Liquid Penetrant Certification (Eddy Current, Liquid Pe
14、netrant, Magnetic Particle, Radiographic and Ultrasonic) for Percent Defective 2.1.2 Other Government Documents and Drawings. The following other government documents and drawings form a part of this specification to the extent specified herein. those in effect on the date of the solicitation. Unles
15、i otherwise specified, the issues shall be . DRAW I NGS Naval Air Engineering Center 41 3745 41 7599 42 356 1 502822 506409 5087 1 3 51 3436 51 7891 609480 Tension Bar, Holdback, F-8 Series, Noninterchangeable (Sol id Type) Release Element (A-6, C-2, E-2) Fixture Adapters, S-3 Tension Bar, Holdback-
16、Tabulated (Hollow Type) (A-4, C-i) Tension Bar, Holdback, F-4, Noninterchangeable (Solid Type) Tension Bar, Holdback, A-3 Series, Noninterchangeable (Solid Type) Release Element (A-7) Release Element (S-3) Test Fixture, Tension Bar (Copies of specifications, standards, drawings and publications requ
17、ired by contractors in connection with specific acquisition functions should be obtained from 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 reference cited herein (except for as
18、sociated detail specifications, specification sheet or MS Standards), the text of this specification 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 Qualification. The te
19、nsion barslrelease elements (TBIRE) furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time set for opening of bids (See 4.3 and 6.3). Provided by IHSNot for ResaleNo reproduction or networ
20、king permitted without license from IHS-,-,-MIL-T-23Ll2bD 17 W 7777906 01725LlLl b W MI L-T-23426D(AS) 3.1.1 Qualification by TBIRE type. Contractors who qualify for a specific TBIRE type shall not necessarily be considered a qualified suppl ier for bars of that general type (See 4.3.2.3). 3.2 Mater
21、ials. The metal for TB/RE shall be made in accordance with materi al s specified on appl i cable drawi ngs . 3.3 Design and manufacturing processes. The design and manufacturing processes shall be in accordance with this specification and the following drawings: 413745, 417599, 423561, 502822, 50640
22、9, 508713, 513436, 517891 and 609480. 3.3.1 Manufacturing Sequence. The sequence of operations for the manufacture of TBIRE shall be as specified in 3.3.1 thru 3.3.1.7. 3.3.1.1 Forging. Forged TBIRE blanks shall be forged as specified in MIL-F-7190 Grade A and the applicable drawing. 3.3.1.2 Identif
23、ication of TBIRE blanks. Each TBIRE lot shall be identified by the contractor qual i ty control designation as specified in 3.5.1 at the time it is cut from the raw metal bar or forging stock. shall maintain its lot identity throughout the fabrication process. The minimum blank envelope shall be dim
24、ensionally as shown on the applicable drawing. This blank is heat treated prior to final machining. Each lot 3.3.1.2.1 Traceability. The contractor shall describe (See 6.5 and 6.8 for submittal time and addressee) his method of control 1 i ng TB/RE traceabi 1 i ty from the end product back to heat t
25、reat lot to raw material bar/forging stock to mill heat number. Said procedure shall be retained by NAEC for possible future use necessitated by Fleet usage problems. . The NAEC reserves the right to required adjustment to procedure if found inadequate for total traceabi 1 i ty. may request a waiver
26、 of submission provided that the procedures previously submitted are fully applicable under the current contract. quenched in accordance with Table II. During heating and quenching all blanks shall be held vertically in separate areas of a wire basket or fixture. A minimum of one-quarter inch (6.35
27、mm) clearance shall separate al 1 P/N 517891-1 blanks from another blank in the basket or fixture. Contractors having previously submitted traceabi 1 i ty procedures 3.3.1.3 Heating and quenching. The TBIRE blanks shall be heated and 3.3.1.3.1 Heat treat lot identification. The contractor is require
28、d to identify each heat treat lot and correlate these lots with the TB/RE blank lot identification as specified in 3.3.1.2. 3.3.1.4 Preparation for hardness test. The TBIRE blanks shall be prepared for hardness testing by machining or grinding 0,030 (t.005, -.OOO) inch (0.762 t .127 - .O00 mm) depth
29、 for a length of 0.50 inch (12.7 mm) over the location of the notched area,.or at an adjacent location not less than 0.375 inch (9.53 mm) from the corner of the notch. The flatness and surface finish shall be as shown on the applicable drawing. Any proposed optional method to be used must be submitt
30、ed to the Naval Air Engineering Center, Code 93, for approval prior to production. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a 4 O a MIL-T-23Li2bD 17 W 777790b 0172545 B m MIL-T-23426D(AS) TABLE II. Hardening requirements for TB/RE P ROC ES S 1
31、. Heat to 2. Hold temperature for 3. Quench in 4. Temper or age (as applicable) .5. Hold temperature for 6. Cool in 7. Rockwell hardness range MIL-S-8699 1550-1 650F 843-989C 1 hour oi 1 Approx. 1 175“F, 635C 2 hours still air C27-31 MATER1 AL MIL-S-6758 1575-1625F 852-8850 112 hour brine (1) 950“F,
32、 510C or higher 2 hours still air C27-31 MIL-3-5000 1 500- 1550“ F 833-861 “C 1 hour oi 1 Approx. 1175“F, 635C 2 hours still air C27-31 Notes: (1) Quench vertically in an agitated brine bath solution of 1 pounds (.680 kg) rock-salt per gallon of water. The bath shall not exceed 140F (60C) during que
33、nch. The bath shall be checked daily and shall show a hydrometer reading of 1.12. 3.3.1.4.1 Rockwell hardness range. Three Rockwell hardness tests shall be made on each TBIRE blank at the prepared surface as specified in 4.5.4. The variation in Rockwell hardness between all tension bar blanks cut fr
34、om the same metal bar representing a lot (See 4.4.1.1) shall not exceed a two point range within the limits specified in Table II for the applicable material. Typical examples of acceptable hardness ranges are Rockwell C 27, 28, 29; 28, 29 and 30. Any TB/RE in a lot not conforming to the two point h
35、ardness range of the lot shall be discarded from the lot before continuing the manufacturing process. another lot. These TBIRE shall not be reheat treated and submitted for approval in 3.3.1.5 Determination of diameter in notched area. 3.3.1.5.1 Type I. For the Type I TBIRE, the hole under the notch
36、 shall be finished to the size and mechanical finish requirements shown on the appl i cable drawi ng . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-23q2bD 17 W 7777706 O1725LIb T W MIL-T-fi426D(AS) 3.3.1.5.2 Middle range for Rockwell hardnes
37、s. For either the Type I, Type II or Type III TBIRE, a TBIRE having a Rockwell hardness corresponding to the middle of the range for the raw metal bar from which it was cut shall be selected for the test bar. The notched area diameter shall be ground or machined to the nominal size shown on the appl
38、icable drawing. 3.3.1.5.3 Test TBIRE data. The test TBIRE shall be pulled at a rate of 25,000 to 30,000 pounds per minute (111,206 to 133,447 newtons per minute) to determine the breaking load. From the results of this test, the notched area diameter required to produce the specified breaking load s
39、hall be calculated. Another TBIRE having a Rockwell hardness corresponding to the middle of the range for the TBIRE as in 3.3.1.5.2 shall be selected and the notched area diameter ground or machined to the calculated dimension plus or minus .O01 inch (.O254 mm) . 3.3.1.5.4 Type III Grain Flow. The g
40、rain flow shall be verified (4.5.5) to follow the contours of the metal as established by the forging process. A sample TBIRE shall be sent to NAEC (Code 91.234) for approval each time there is a major change in the forging technique or process. 3.3.1.6 W. If a pull test on this TBIRE confirms the s
41、pecified breaking load, the remaining blanks shall be finished machined and the notched area diameter ground or machined to the same dimension plus or minus .O01 inch (.O254 mm). 3.3.1.7 Quality control. At each manufacturing operation, each TBIRE shall be checked in and out on the production inspec
42、tion report. Upon detection, at any stage of manufacture, a defective TBIRE shall be immediately mutilated and removed from the production run for disposal and the production inspection report so noted. 3.4 Heat treatment. The equipment requirements of Section 3 and the inspection and test procedure
43、s of Section 6 relating to the heat treating equipment of MIL-H-6875 (for steel) shall apply. 3.5 Identification of product. Letters and numbers shall be etched or metal stamped on the TBIRE as shown on the applicable drawings. is used, the TBIRE head shall be supported to prevent the stamping load
44、from being applied to the notched area. fluorescent penetrant inspection marking (when applicable) and part number, Federal Supply Code for Manufacturers, nominal breaking load (if required by the applicable drawing) and the contractor qual i ty control designation shall be included. When stamping M
45、agnetic particle inspection and 3.5.1 Contractor qual i ty control designation. The contractor qual i ty control designation for each TBIRE shall consist of a lot number and a supplemental dash number. TB/RE which comprise a lot as specified in 4.4.1.2. with Al, A2, . . . A99, B1, 82 and continue in
46、 alphanumeric sequence to 299. The sequence shall continue using double letter alphanumeric AA-1 thru AA-99; AB-1 thru AB-99; AZ-1 thru AZ-99; BA-1 thru BA-99; BB-1 thru BB-99; BZ-1 thru BZ-99; thru ZZ-99 before upsetting the lot control number for each TR/RE The lot number shall be assigned to each
47、 group of Lot numbers shall begin e P . O a 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2342bD 17 77779Ob 0172547 I part number. contracts so that any repeat numbers will occur only after many years. Letters I. L. O. Q. shall not be used.
48、 Each TBIRE within each lot shall be identified with a supplemental dash number. Examples of contractor qual i ty control designations are: Al-1 through Al-60, A2-1 through A2-60, to 299-1 through 299-60. The sequence shall be carried anew by the vendor into subsequent 3.5.2 Color coding for identif
49、ication. The TBIRE shall be cleaned prior to application of primer and paint with materials and processes which have no deleterious effects on the bars. The TB/RE shall be treated and painted as shown in Table III with finish colors to FED-STD-595 applied as shown on the applicable drawings. 3.6 Hardness records. Records of the results of all hardness tests shall be maintained by the contractor. 3.7 Performance. The TBIRE shall satisfy the performance r
