1、MIL-C-87772A 53 W 7777706 0332984 W MIL-8797 2A 7 December 1987 SPEBSEXXNG MIX-8797 2 4 May 1984 MILITARY SPECIFICATION This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCCIPE 1.1 Scape. This specification covers rigid and swivel casters for air
2、craft maintenance stands in flightline use. 1.2 Classification. Items covered by this specification are identified as follows : Caster assembly, swivel Caster assembly, rigid Wheel assembly 2.1 Government documents. 2.1.1 Sptcifications and standards. The following specifications and standards, form
3、 a part of this specification 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 (DDISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS l?ED
4、EmL PPP-B-576 - Boxes, wood, Cleated, Veneer, Paper Overlaid PPP-B-591 - Boxes, Shipping Fiberbard, woodleated PPP-B-585 - Box, wood, Wirebound Benef icial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: S
5、an Antonio Air Logistics Center, AFLC: SA-ALC/hMEXO, Kelly -8 Texas 78241- 5990 by using the self-addressed Standardization Document Inprovement Proposal (DD Form 1426) appearing at the end of this document or by letter. DISTRIBTION ST“ A. App roved for public release; distribution is unlimited. r 1
6、 THIS DOCUMENT CONTAINS /z PAGES, f- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIX-8797 2A PPP-Ei-601 - Boxes, Wood, Cleated-Plywood PpP-B-621 - Boxes, wood, Nailed and Lock-Corner PPP-T-60 - Tape, Packaging, Waterproof MILITAW MIL-P-116 - Pres
7、ervation, Methods of MIM-121 - Barrier Material, Greaseproofed, Waterproofed, Flexible MIL-F-3541 - Fitting, Lubrication ML-M-8090 - Wility, Towed Aerospace Ground Equipment, General Requirements for MIL-L-10547 - Liner, Case and Sheet, Overwrap, Water-Vaporproof or Waterproof, Flexible MIL-G-10924
8、- Grease, Automotive and Artillery FEDERAL FED-STD-601 - Rubber: Sampling and Testing MILITAW DOD-CTD-100 - Engineering Drawing Practices MIL-STD.105 - Sampling Procedures and Tables for Inspection by MIL-STWl29 - Marking for Shipment and Storage MIL-STD-130 - Identification Marking of U.S. Military
9、 Property MIL-SID-794 - Parts and Equipment, Procedures for Packaging of MIL-STD-808 - Finish Material and Processes for Corrosion Prevention MIL-STD-810 - Environmental Test Methods MIL-STD-831 - Test Reports, Preparation of MIL-ST-889 - Dissimilar Metals MIL-STD-1186 - Cushioning, Anchoring, Braci
10、ng, Blocking and Water- Attributes and Control in Support Equipment proof ing, with Appropriate Test Methods (wies of specifications, standards, handbooks, drawings, publications and other Government documents required by contractors in connection with specific acquisition functions should be obtain
11、ed from the contracting activity or as directed by the contracting activity.) specification to the extent specified herein. Unless otherwise specified, the issues o the documents which are DoD adopted shall be those listed in the issue of the DODISC specified in the solicitation. Unless otherwise sp
12、ecified, the issues of documents not listed in the DODISS shall be the issue of the non- government documents which is current on the date of the solicitation. 2.2 ther publications. The following documents form a part of this 2 I 3 Provided by IHSNot for ResaleNo reproduction or networking permitte
13、d without license from IHS-,-,-MIL42-87972A ASm ASm D3951 - Sadar Practice for cormrierFia ASTM A48 - Grey Iron Castings (Application for copies should be addressed to SIM, 1916 Race Street, Philadelphia, PA 19103.) AMERICAN NATIONAL STANaARDs INCTIIVJE (ANSI) ANSI Yl4.5M - Dimensioning and Toleranc
14、ing (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway New York, Ny 10018.) (Non-governmnt standards and othercpublications are normally available fran the organizations which prepare or which distribute the documents. documents also may be availa
15、ble in or through libraries or other informational services. ) In the event of a conflict betwen the text of this specification and the references cited herein (except for associated specification sheets) , the text of this specification shall take precedence. Nothing in this specification, however,
16、 shall supersede applicable laws and regulations unless a specific exemption has been obtained. These 2.3 Order of precedence. 3. FEQUI- 3.1 First article. When specified, samples shall be submitted to the activity designated in the contract or purchase order for first article inspection to determin
17、e conformance to the requirements of this specification (see 4.3 and 6.2). 3.2 Camnents. The casters shall consist of the following components: a. Munting plate b. Horn assembly c. Wheel assembly d. Kingpin 3.3 Material. The material shall be as specified herein. However, when a definite material is
18、 not specified, a material shall be used which will enable the casters to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.3.1 Dissimilar metals. When dissimil
19、ar metals are used in inthte contact, suitable protection against galvanic corrosion shall be applied in accordance with MIL-SW889. defined in Mu;-STD-889. Determination of dissimilar mtals shall be as 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
20、,-MIL-C-87972A 3.3.2 Protective finish. Materials used in the construction of the casters shall be suitably finished to provide corrosion protection against the performance requirements specified herein and in mrmal conditions of use, storage and exposure. The protective finish shall be stable and d
21、urable, shall not crack, chip, flake, powder or scale, and shall not interfere with the applicable performance requirements specified herein and in accordance with MIL-SIW808 . 3.3.3 Fkccle, virqin and reclaimed materials. There is no requirement that an item be manufactured from virgin materials. 3
22、.4 Desicin. The casters shall be plate munted, single wheeled, solid rubber tired, in accordance with Figure 1 or Figure 2. 3.5 Construction. The casters shall be so constructed that no parts will wrk loose in service. They shall be designed to withstand the strains, jars, vibrations, and other cond
23、itions incident to shipping, storage, installation, and service for which it is intended (see 6.1). 3.5.1 Mwntinq plate. and be a flat plate type. The mounting plate shall be made of carbon steel, 3.5.2 Horn assembly. The horn assenbly shall be made of carbon steel. n swivel casters, the horn assemb
24、ly shall be asse a. First article inspection (see 4.3) b. Quality conforniance inspection (see 4.4) 4.4 ality conformance inspection. Quality conformance inspection shall be in accordance with Table II. o INSPrnIoN Group A Examinat ion Group B Brake test Humidity Static load Tread hardness Group C S
25、alt fog Sand and dust U 3.5.8 3.6.1 3.6.4 3.6.5 3.6.2 3.6.3 TEST METHD PARAGRAPH 4.5.1 4.5.3 4.5.4.1 4.5.5 4.5.6 4.5.4.2 4.5.4.3 r/ Ail requirements not covered by tests. 4.4.1 produced under essentially the same conditions, ami offered for inspection at one time. Inspection lot. An inspection lot s
26、hall consist of all casters 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIGC-8797 2A 4.4.2 Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct thedefects, or screen out the defective units and resubit for re
27、inspection. Resubmitted lots shall be inspected ushg tightened inspection. Such lots shall be separate fra new lots, and shall be clearly . identified as reinspected lots, 4.4.3 Samplinq for Group A inspection. Sampling shall be in accordance with MUL-CTD-105 Inspection Level II with an Acceptable Q
28、uality Level (QL) of 1.5 percent defective far major defects. For minor defects, Inspection Level I with an AQL of 4.0 percent defective shall apply. specified in Table III. 4.4.3.1 Classification of defects. Defects shall be classified as TABLE III. CLASSIFICATION F DEFEcrs amGORy CEFECT Critical I
29、 None defined Major 101 102 103 104 105 106 LO7 Zerk-type lubrication fittings missing Improperly ascembled Bowed, bent, buckled or otherwise deform4 Wheel bearings or swivel bearings bind when rotated Tire loose on wheel Wlds contain cracks, burnt holes, porosity, or incomplete fusion Welds contain
30、 pits or fissures Minor 201 202 203 204 205 206 207 Tire contains blisters, pits, cracks, prosilq, gouges, checks or discoloration &idence of rust or corrosion Not treated or painted as applicable Dimensions not in accordance with Figure 1 Burrs and sharp edges Tiireads stripped Marking incaplete, n
31、ot legible, not permanent, not located as specified 4.4.4 Samplinq for Group B inspection. Sampling shall be in accordance with MIL-STD-105t Inspection Level S-2 with an AQL of 2.5 percent defective and may be made on sample units which have been subjected to and have passed Group A inspection, 4.4.
32、4.1 Disposition of samp le units. Sample units which have passed all the Group B inspection may be delivered on the contract or purchase order if the lot is accepted and the sample units are still within specified requirements . 10 Provided by IHSNot for ResaleNo reproduction or networking permitted
33、 without license from IHS-,-,-MIL-C-87972A 53 W 9999906 033299Li O m a * 0 a MIL-c-8797A 4.4.5 Sarrrplinq for Group C inspection. Dimsition of samp le units. Sampling shall be in accordance with MIL-STD-105, Inspection Level S-2 with an AQL of 4.0 percent defective. Sample units which have been subj
34、ected to Group C inspection shall not be delivered on the contract. 4.4.5.1 4.5 Methods of inspection. 4.5.1 Examination. Sample casters shall be thoroughly examined to determine conformance with this specification with respect to all requirements not covered by tests. 4.5.2 Test fixture. The follow
35、ing test fixture shall be used for the brake (4.5.3) and static load (4.5.4) tests. A platform or circular or triangular design shall be used. The platform shall be capable of supporting a minimm of 2,500 pounds and have a means of securing three caster asselies utilizing all four mounting bolt hole
36、s in the top plate. such a manner that when the load is applied to the platform, it will be equally distributed through each caster. caster, a total of 1,500 pounds will be used to acccqlish the test and when 800 pounds is required for a caster 2,400 pounds will be used to accomplish the test. The c
37、asters shall be positioned in When a total of 500 pounds is rquired for a 4.5.3 Brake. Brakes shall be tested as follows: The caster shall be loaded to 500 lbs an the brakes applied. wheel motionless whether headed up or down on a dry, concrete, 20 degree incline. environmental tests described in 4.
38、5.3. brakes shall be examined. reject ion. The brakes shall hold the caster The brakes shall be installed on the caster when subjected to the At the conclusion of these tests, the Band separation or other damage shall be cause for 4.5.4 Environmental tests. The following tests shall be conducted in
39、accordance with the specified procedures of MIL-STD-810. 4.5.4.1 Humidity. The caster shall be subjected to humidity in accordance with Method 507.2 procedure I, non-hazardous items, natural cycle 1, Table 504.2-11 of MIL-STD-810D. 4.5.4.2 Salt fos. The caster shall be subjected to salt fog in accor
40、dance with Method 509, procedure I for a period of 50 hours. substantial evidence of corrosion, bearing failure, orfailure of coatings or finishes. There shall be no 4.5.4.3 Sand and dust. The caster shall be subjected to sand and dust in accordance with Method 510.2, procedure I (blowing dust) of M
41、iL-STD-810D. A velocity of 1500 to 2000 fpm for steps 2 and 7 and a temperature of 63C (1451) for step 5 are considered acceptable for this procedure. At the conclusion of the test, there shall be no evidence of dust particles in the bearings of either the wheels or the swivel and no failure of coat
42、ings or finishes. 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-8797 2A 4,5.5 Static load test. Caster, without the rubber tread, shall be subjected to the static load test. A static proof load equal to the rated load of 500 pounds shall be
43、applied through the tcp plate of the caster by means of weights or a press for a period of 15 minutes followed by a static ultimate load of 800 pounds for a period of 15 minutes. The caster assembly shall then be inspected to determine that no damage or permanent deformation has occurred. Any damage
44、 or permanent deformation in the caster assembly shall be cause for rejection, 4.5.6 Tread hardness test. The hardness of the tread as received shall be measured on the face of the tread by a Type A Shore durometer and shall be 75 -0 points when tested according to EED-STD-601, Method 3021. 4.5.7 Fi
45、rst article test report. When specified, the contractor shall prepare a report of the first article tests in accordance with MIL-STD-831 (see 6.3). 5. PACUGING 5.1 Preservation and packaqinq. Preservation and packaging shall be Level 5.1.1 Level A. A, C or industrial/coamiiercial packaging (see 6.2)
46、 . 5.1.1.1 Unit packaqinq. Casters shall be preserved in accordance with Method 1 of MIL-P-116. Ball or roller antifriction bearings shall be adequately lubricated with a preservative grease conforming to MIL-G-10924. Each caster shall be wrapped in Grade A greaseproof barrier material conforming to
47、 MIL-B-121. and further overwrapped with kraft paper, 60 pound (24 by 36) to prevent abrasion. Unit quantities shall be as specified by the procuring activity . 5*1.2 Level C. Casters shall be preserved and packaged in accordance with the MIL-STD-794. 5.1.3 Indusfxial/commercial. Casters shall be pr
48、eserved and packaged in accordance with ASTM-D-3951. 5.2 Packinq. Packing shall be Level A, B, C or industrial/comniercial as specified (see 6.2). packaged in exterior shipping containers conforming to PPP-B-576, Style B, Class 2, PPP-B-585, Style 3, PPP-B-601, Overseas Type, or PPP-B-621, Class 2.
49、As far as practical, exterior container shall be of uniform shape and size, of mininaun cube an tare consistent with the protection required, and shall contain identical quantities. The gross weight of each pack shall be limited to approximately 200 pounds. Containers shall be closed an strapped in accordance with the applicable container specification or appendix thereto. 5.2.1 Level A. Casters preserved and packaged as specified in 5.1 sha
