1、NIL-G-L557C PA m 7777706 0287590 5 MIL-G-81559C 23 March 1984 SUP ERS ED I NG MI L-G-81559A MIL-G-O081559B(AS) 9 July 1971 15 March 1974 MILITARY SPECIFICATION GYROSCOPE ASSEMBLIES AND ATTITUDE AND DIRECTIONAL REFERENCE INSTRUMENTS FOR AIRCRAFT; PACKAGING OF This specification is approved for use by
2、 all Departments and Agencies of the Department of Defense. I. SCOPE 1.1 Scope. This specification covers procedures for the packaging of sensi tive gyroscope assemblies and other atti tude and directional reference instruments for aircraft (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents
3、. 2.1.1 Specifications and standards. Unless otherwise specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation, form a part of this specification to the extent .
4、specified herein. SPECIFICATIONS FED ERAL TT-C-490 Cleaning Method and Pretreatment of Ferrous Surfaces for Organic Coatings TT-E-485 Enamel, Semi-gloss, Rust-inhibi ting TT-E-529 Enamel, Alkyd, Semi-gloss Beneficial comments (recommendations, additions, deletions) and any pertinent data which may b
5、e of use in improving this document should be addressed to: Commanding Officer, Naval Air Engineering Center, Code 9321, Lakehurst, NJ 08733 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. _- 7 r t NO DELIVE
6、RABLE DATA REQUIRED BY THIS DOCUMENT c J E I AREA PACK 1 THIS DOCUMENT CONTAINS PAGES. Licensed by Information Handling ServicesMI L-G-81559C SPECIFICATIONS (continued) FEDERAL (continued) TT-P-1757 PPP-6-636 PP P-T- 60 MILITARY MI L-P-116 MIL-C-3133 MI L-C-5501 MI L-C-5541 MI L-A-8625 DOD-P-15328 M
7、I L-P-15930 MI L-P-23377 MI L-V-27 1 66 MI L-C-46 1 68 MIL-P-52192 MI L-C-83286 STANDARDS FEDE RA L FED-STD- 1 O1 FED-STD-595 MILITARY MIL-STD-105 MIL-STD-129 MIL-STD-130 Primer Coating, Zinc Chromate, Low Moisture Sensi tivi ty Boxes, Shipping, Fi berboard Tape, Packaging, Waterproof Preservation,
8、Methods of Cellular Elastomeric Materials, Molded or Fabricated Parts Cap and Plug, Protective, Dust and Moisture Seal Chemical Conversion Coatings on Aluminum and Aluminum Alloys Anodic Coatings, For Aluminum and Aluminum Alloys Primer (Wash), Pretreatment Primer Coating, Shipboard, Vinyl-Zinc Chro
9、mate Primer Coating; Epoxy Polyamide, Chemical and Solvent Resistant Valve, Pressure Equalizing, Gaseous Products Coating, Aliphatic Polyurethane, Chemical Agent Resi stant Primer Coating, Epoxy Coating Urethane, Aliphatic Isocyanate, for Aerospace Appl i cations Test Procedures for Packaging Materi
10、als Col ors Sampl i ng Procedures and Tab1 es for Inspection by Attributes Marking for Shipment and Storage Identification Marking of U. S. Military Property 9 2 . 3 Licensed by Information Handling Services MIL-G-L559C PA 999970b 0287592 9 m MI L-G-81559C STANDARDS (Continued) MILITARY (Continued)
11、MIL-STD-670 MIL-STD-794 Classification System and Tests for Cellular Elastomeric Materials Parts and Equipment, Procedures for Packaging of MS25043 MS9037 6 Cap, Dust, Plastic, Electric Connector Cover, Electrical Connector, Receptacle, AN Type (Copies of specifications and standards required by man
12、ufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer). 2.1.2 Other publications. The following document forms a part of this specification to the extent specified herein. The issue of the document whic
13、h is indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D951 (Application for copies should be addressed to the American Society for Water Resistance of Shipping Containers by Spray Met
14、hod Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) O NATIONAL AEROSPACE STANDARDS NAS 813 Cap - Protective, Electrical Connector NAS 820 Plug - Protective, Electrical Connector (Application for copies should be addressed to the Aerospace Industries Association, 1725 DeSales Street
15、, N.W., Washington, DC 20036,) 2.2 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS 3.1 First article. When specified, a sample shall be subjected t a first ar
16、ticle inspection (see 4.3, 6.2 and 6.3). 3.2 Definition of terms. For purposes of this specification, the following definitions shall apply: a. Container system - the shipping container only with a dummy load instal led b. Pack - the shipping container including the applicable item packed as for shi
17、pment 3 - Licensed by Information Handling Services I MIL-G-L559C PA W 999990b 0289573 O W . - MI L-G-81559C 3.3 Packaging requirements. 3.3.1 General. Packaging of gyroscope assembl ies or other attitude reference display instruments shall meet the requirements for level A or B protection of MIL-ST
18、D-794, as specified (see 6.2). The method of cleaning shall be C-1 of MIL-P-116. The method of preservation shall be IC, IA or II, as specified (see 6.2), accomplished in accordance with the detail requirements specified herein. The gyroscope assembly or other atti tude reference display instrument
19、shall be packaged in shipping containers prescribed herein. The interior handling case, when used, shall be designed so that its insertion and removal from the exterior container can be easily accompl i shed. When exposed termi na1 s or connectors subject to corrosion are present, the terminals or c
20、onnectors shall be closed with metal caps or plugs conforming to MIL-C-5501 or MS25043, plastic caps or plugs conforming to MS90376, NAS 813 or NAS 820, or waterproof tape conforming to PPP-T-60, or equivalent. The complete unit, after cushioning any sharp edges or points with nondusting, noncorrosi
21、ve cushioning material as necessary, insertion of desiccant in accordance with MIL-P-116, if required, and enclosing in a heat-sealed bag fabricated of appropriate material, shall , when specified, be immobilized in an interior handling case (see 6.2). closing the interior handling case, it shall be
22、 centrally placed in the shock-isolation media of the exterior container. The exterior container shall be closed so as to accomplish a water resistant pack. 3.3.3 New materials. The use of newly developed packaging materials or products is encouraged and recommended providing they are equal or bette
23、r than simi lar approved materials or products without increasing the overall cost to the Government. inclusion in a Government specification, their use will be permitted under conditions outlined herein. In instances where the material or product is not covered by a specific military specification,
24、 the manufacturer or fabricator of the material or product shall furnish documented evidence certified by an approved testing laboratory, that the material or product meets or exceeds al 1 requirements of the performance specification for a similar material or product. The request for approval shall
25、 be submitted to the acquiring activity via the technical packaging element of the contract administration activity. compliance report, or the witnessing of the stipulated tests, it is the opinion of the approving authority that the material or products meets or exceeds the criteria established for
26、similar material or products, interim authorization for use may be granted pending preparation of a new specification. 3.3.2 Detai 1. After To expedite their use prior to their If, after a review of the material or product and related certified 3.4 General design requirements. The shipping container
27、 shall be designed to accomodate the gyroscope assembly or other atti tude reference instrument through its entire logistical cycle, which includes initial delivery of instrument from the supplier through retrograde shipments. The container with its interior preservation and packaging provisions sha
28、ll protect the equipment from damaging shock, vibration, rough handling, or contamination that might occur during handling, transit and storage (see 6.1). container with the use of simple tools. satisfactorily in ambient temperatures ranging from -20“ to 120F. The packaged equipment shall be quickly
29、 and easily removable from the The container shall function 4 Licensed by Information Handling ServicesMI L-G-81559C 3.5 Detail design requirements. 3.5.1 Interior handling case. If an interior handling case is used (see 6.2), it shall be molded of fiberglass, virgin polyethylene, or other vi rgi n
30、syntheti c/pl as t i c mater i al s , or fabr i cated from syntheti c/pl ast i c foams, plastic board, corrosion resistant metals or a combination of these materials. Weather-resi stant corrugated fi berboard boxes conforming to PPP-6-636 may be used, if specified (see 6.2). Unless corrugated materi
31、als are used a handle shall 6e provided. Closure hardware shall be captive. unit to be packaged shall be centrally located and snugly restrained within the hand1 ing case using convoluted polyurethane or other suitable cushioning material having a minimum thickness of one inch. The size of the handl
32、ing case cavity shall be as specified by the acquiring activity (see 6.2). The 3.5.2 Exterior container. Unless otherwise specified the container shall be molded of fiberglass,. virgin polyethylene, or other virgin synthetic/pTastic materials, or fabricated from syntheticlplastic foams, plastic boar
33、d, or corrosion resistant metal or a combination of these materials. Containers so constructed shall consist basically of a lower and upper shell (body and cover). she1 1s shall be secured with recessed captive quarter-turn fasteners or overcenter spring loaded latches. A water resistant seal shall
34、be maintained by a suitable tongue-in-groove type closure with the groove portion located in the container cover. replaceable. Separately applied sealing compounds or materials shall not be allowed. Nhen assembled, the loading force on the gasket shall be uniform and no greater than that required fo
35、r sealing. Weather-resi stant corrugated fiberboard boxes conforming to PPP-6-636 or wood containers may be employed, when specified (see 6.2). The mating surfaces of the upper and lower The gasket shall be one continuous length and easily 3.5.2.1 Size and equipment weight. The overall size of the e
36、xterior container shall be engineered to minimum dimensions consistent with the exterior dimensions of the item or the interior handling case, as applicable, the weight range of items being packaged, and the shock attenuation and vibration isolation required to meet the rough handling tests specifie
37、d in 3.7.1 (see 6.2). 3.5.2.2 Cover. Unless otherwise specified (see 6.2), exterior container covers shall be detachable from the base. The cover shall be so designed to prevent damage to the attaching hardware during impacts as encountered in service and testing. Also, provisions shall be incorpora
38、ted to ensure a unique orientation of the detachable cover when mated with the base of the container. 3.5.2.3 Handles. Unless otherwise specified (see 6.21, handles Handles shall be a chest type designed for surface shall be provided on all containers other than those constructed of wood or corrugat
39、ed fiberboard. mounting with stops to hold the bail at a right angle to the mounting plate when in a carrying position and springloaded to fold the bail into a down position when released. not less than 4.25 inches with a minimum clearance of 1.8 inches between the bail grip and the mounting plate.
40、Handles shall be attached by sealed rivets. The handles of the container shall not malfunction nor shall the handles unduly deform or cause the container to deform when the container is tested in accordance with 4.5.2. Two handles (one on each end) will be The bail of the handle shall have an inside
41、 length of 5 Licensed by Information Handling ServicesMIL-G-L557C PA 777770b 0287595 4 MI L-G-81559C required for containers with an anticipated gross weight under 120 pounds; four handles (two on each end) for containers with an anticipated gross weight over 120 pounds. 3.5.2.4 Protection of extern
42、al hardware. The container shall incorporate bosses, corrugations or recesses so as to provide protection for any exterior hardware and handles. 3.5.2.5 Shock and vibration isolation. The container shall have provisions for isolating the item or interior handling case, as applicable, from shock and
43、vibration encountered in shipment and storage. accompli shed by use of a shock-mounted platform securely attached to the inside of the exterior container or a resilient cushioning system. isolation system shall be capable of satisfactory operation over the temperature range specified in 3.4. This ma
44、y be The shock 3.5.2.6 Platform. If a shock mounted platform is employed (see 3.5.2.51, the platform shall either be molded of the same material as the container shell or fabricated from aluminum. Platform size shall be sufficient to accomodate the applicable interior handling case with item install
45、ed. The platform shall have a minimum one inch vertical flange around its outer edge. A 1/4 inch thick, open cell, neoprene sponge mat conforming to MIL-C-3133 and MIL-STD-670, Type 5, Class SC, Grade SCO-3 (Groendyk #571-N or equivalent) shall be provided on the mounting surface of the platform. Al
46、uminum, if used, shall be anodized in accordance with MIL-A-8625. The payload shall be secured to the platform with two or three tie-down straps (AGM Cargo Ties, P/N (08992)CT1460 or equivalent). the width of the platform. The third strap, when required, shall be located along the longitudinal cente
47、rline of the platform. Straps shall be captive. 3.5.2.7 Pressure relief valve. Unless otherwise specified (see 6.21, an automatic pressure/vacuum relief valve with manual pressure release and minimum flow rate conforming to MIL-V-27166 shall be installed in the exterior container wall for all contai
48、ners other than those constructed of wood or corrugated fiberboard. The valve shall crack at a pressure differential of 1.0 psig (2 0.15) and shall reseal at a minimum pressure differential of 0.5 psig for both vacuum and pressure relief. resealing pressure may be lowered to 0.5 psig (20.1) and .25
49、psig respectively, if the design of the container inherently allows expansion and contraction of the container wall s to compensate for this decreased pressure differential. This reduction, however, must be demonstrated by appropriate pressure/temperature testing by the container manufacturer. Two straps shall traverse Cracking and 3.5.2.8 Accessory attachment. A commercially acceptable waterproof seal (i .e. gasket) shall be required for al 1 externally mounted accessories. 3.5.2.9 Fork lift provisions. Containers over 40 inches in the longest dimension or over 150 pounds gross
