1、.=3 w . .- MIL-D-2757E 66 m 777770b 0129152 1 m F-0 1-45 MIL-D-2759E(SH) 18 December 1987 SUPERSEDING MILITARY SPECIFICATION DEAD RECKONING TRACER (DRT) (NAVAL SHIPBOARD) MIL-D-2759D(SHIPS) 18 October 1963 (See 6.7) This specification is approved for use within the Naval Sea Systems Command, Departm
2、ent of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the design of Dead Reckoning Tracer (DRT) for use in Naval ships. 2. APPLICABLE DOCUMENTS 2.1 Government documents. P 2.1.1 Specifications and standar
3、ds. The following specifications form 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 (DODISS) and supplement thereto, cited in
4、 the solicitation. SPECIFICATIONS MILITARY MIL-E-17555 - Electronic and Electrical Equipment, Accessories, and Provisional Items(Repair Parts): Packaging of. MIL-E-16400 - Electronic, Interior Communications, and Navigation Equipment Naval Ship and Shore, General Specifica- tion For. Beneficial comm
5、ents (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101. by using the self-addressed Standardization Document Improveme
6、nt Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 6605 DISTRIBUTION STATEMENT A Approved for public release; distrubution unlimited THIS DOCUMENT CONTAINS /I PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
7、-,-,- MIL-D-2757E bb 77?7706 032Lll153 3 MIL-D-2759E(SH) I 2.1.2 Other Government drawing and publication. The following other O Government drawing and publication form a part of this specification to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the
8、 date of the solicitation. DRAWING I NAVAL SEA SYSTEMS COE.IMAND (NAVSEA) S2457-533730 - Drafting Plachine, MK 3 Mod 3, Details. PUBLICATION I NAVY HYDROGRAPHIC OFFICE (“0) Publication No. 9 - American Practical Navigator. (Application for copies should be addressed to the Superintendent of Document
9、s, U.S. Government Printing Office, Washington, D.C. 20401.) t (Copies of specifications, drawings and publications required by con- tractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity,) 2.2 Other publ
10、ications. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of the DoDISS specified in the solicitation, Unless otherwise specifed, the issues of d
11、ocuments not listed in the DoDISC shall be the issue of the non- government documents which is current on the date of the solicitation. AMERICAN GEAR MANUFACTURERS ASSOCIATION (AGIIA) 236 - Inspection of Fine-Pitch Gears. ( Application for copies should be addressed to the American Gear Elanu- factu
12、rers Association, 1500 King Street, Suite 201, Alexandria, VA 22314,) UNIFORM CLASSIFICATION COIMITTEE AGENT Uniform Freight Classification Ratings, Rules and Regulations. (Application for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106
13、, 222. South Riverside Plaza, Chicago, IL 60606.) (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. These documents also may be available in or through libraries or other inform- ational services.) 2.3 Order
14、 of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this speci- fication shall take precedence. Nothing in this specification, however, shall
15、 supersede applicable laws and regulations unless a specific exemption has been obtained. O 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L - MIL-D-2757E bb 7399706 0129159 5 MIL-D-2759E( SH) 3. REQUIREMENTS 3.1 First article. When specified in t
16、he contract or purchase order, a sample shall b2 subjected to first article inspection (see 4.4 and 6.4). 3.2 Operation. The DRT shall operate as follows: North and east compo- nents of own ships distance traveled in the form of step by step signals of 115 volts direct current (Vdc) at 750 revolutio
17、ns per nautical mile from dead reck- oning analyzer-indicators are supplied to the DRT. DRT plotting head so that own ships geographic position is continuously indic- ated on an overlayed chart of any scale specified in 3.5.4 as the center of polar diagram and recorded as a pencil mark on plotting p
18、aper. Own ships current position in latitude and longitude are also continuously displayed on dials. These signals position the 5 = . 3.3 General features. The DRT shall be in accordance with the following “E requirements of MIL-E-16400, in addition to the requirements specified herein: General requ
19、irements Definitions Materials , general Substitution of (equal or superior) naterials or parts Fungus-inert materials Unacceptable materials Acceptable materials Flammable materials Arc-resistant materials Toxic materials Wood Metals Plastics Ce rami cs Impregnating, embedding and encapsulating com
20、pounds Glass Lubricants and lubrication Pa i nt i ng Protection against corrosion Bolts, machine screws, studs and nuts Gaskets Dials and pointers Dial sizes Locking devices Was hers Ball bearings (precision grade required) Parts - electrical - general Requirements for semiconductor devices Electron
21、 tube or capacitor sockets Capacitors Variable resistors Transformers Relays Synchros Electrical tapes Bat teries 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-PIIL-D-27 59E( SH) Dial illumination lamps Switches Indicator lights and lampholders F
22、uses Fuseholders and fuse clips Metallic rectifiers Printed wiring and circuits Enclosures - general Enclosure - accessibility Enclosure - degree of (dripproof) (see 3.5.1) Enclosure - mounting (see 3.5.1) Stiffening grooves llinimum sheet metal thickness (watertight enclosures) Through bol. t ing C
23、able entrance Ventilation Size (for submarines) Threaded devices Rounded corners and edges Internal subassembly protection (see 3.5.2) Drilled tapped holes i?e Id ing Temperature and humidity (see 3.5.1) Accelerated life Shock, vibration, and inclination (vital vibration test required)(see 3.4) Prim
24、ary power supply circuits Power supply tolerances Personnel protection Shielding and radio frequency noise reduction Ground potential and grounding Soldering Electrical parts mounting Internal Subassembly connection Terminal boards, connectors and terminals Wiring Dial illumination Electrical insula
25、tion Dielectric strength and insulation resistance clearances Airborne noise Structureborne noise Drawings - general Drawings - preliminary Drawings - working Schematic diagrams - Wiring diagram - Assembly drawings Drawings - manufacturing Bill of materials Interchangeability and standardization lla
26、nuals O 4 ? I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-D-2757E 66 M 7777706 0324356 7 MIL-D-2759E( SI) Repair parts Repair parts (electronic) Designation and marking Rep or t s Nomenclature Workmanship and general examination 3.4 Constr
27、uction. The DRT shall be so constructed that vibration, shock, or acceleration, which may be encountered in service on board any of the types of ships for which the equipment is intended, will not adversely affect the accuracy of the equipment under normal conditions, nor, under extreme condi- tions
28、, derange any part of the equipment beyond normal adjustment at sea. The equipment shall be so constructed that the operator will not receive aii electric shock when making any ordinary adjustment while the equipment is in operation. 3.4.1. Excessive play between moving parts, resulting in noise whe
29、n the equipment is subjected to vibration, shall be eliminated insofar as practicable. 3.4.2 The equipment and its operation shall not be adversely affected by magnetic fields up to 5 gausses. 3.4.3 Adjusting devices shall be free from excessive friction. Each adjusting device requiring a setting sh
30、all be provided with a suitable graduated dial, scale, or indicator, which shall be so constructed that it may be read without difficulty. Handles of adjusting devices shall be so constructed or protected that accidental contacts will not disturb them or change their setting or shall be provided wit
31、h protective covers attached to the unit in such a manner as not to cause interference or affect ease of handling. 3.4.4 Resolvers, friction disks, rollers, and other mechanical components shall be of a suitable material, properly and evenly hardened or treated to prevent wear. They shall, wherever
32、practicable, be provided with oil-saturated felt wipers for lubrication. 3.4.5 Bearings shall be double-shielded, shall be at least class ABEC3, and shall be the prelubricated sealed-for-life type. 3.4.6 Viewing windows, where required, shall be so mounted as to minimize danger of breakage or cracki
33、ng due to stress at the edges. 3.4.7 Electrical connections from each unit to external circuits shall be brought out to common termination connectors. I 3.4.8 Parts of the equipment requiring accurate placing shall be marked or doweled, so that when disassembled for repairs or adjustments, the parts
34、 may be replaced in their proper position. Parts requiring occasional renewal due to unavoidable service wear shall be constructed for maximum practicable ease of replacement. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-2757E bb m 797770b
35、 OL2LIL57 O m MIL-D-2 7 5 9E ( SH) O 3.4.9 Interchangeability. In no case shall parts be physically inter- changeable or reversible unless such parts are also interchangeable or revers- able with regard to function, performance and strength. 3.4.10 Proposed changed in design affecting interchangeabi
36、lity of parts of assemblies, including repair parts, shall be satisfactory to the Command or agency concerned before being made effective. 3.4.11 Terminal boards shall be provided with protective covers to prevent accidental short circuits while working on the tracer. 3.4.12 The effect of roll and p
37、itch shall not adversely affect the opera- tion of any unit of equipment (see 4.6.2) 3.4.13 Provision shall be made to protect the DRT against possible damage in case the equipment is allowed to run to or beyond its operating limits. .1 3.4.14 Mercury and radium, in any form, shall not be used in th
38、is equip- ment nor in the manufacture or test of this equipment. 3.4.15 All cable shields shall be tied to a common point and grounded at that point within the equipment. 3.4.16 Gears. Gears used in critical backlash applications shall be at least sixty-four pitch and precision 1C as defined by AGMA
39、 236 and of a material satisfactory to the Command or agency concerned. gears may be used where this material will provide superior performance. Low torque, high precision gears shall not be lubricated unless they are fully sealed in an enclosure. Corrosion resisting steel O 3.5 Mechanical f eatures
40、. 3.5.1 Enclosure. All parts required for the proper operation of the DRT shall be mounted in an enclosing case (degree of enclosure dripproof or better) constructed for horizontal mounting. Provision shall be made for the protection of gears from dust. Mounting and external wiring of the equipment
41、shall be accomplished without removal of components from the enclosure and without expos- ing the gears to dust. Internal subassemblies shall not be supported by the enclosure. operation at any ambient temperature within the limits specified in MIL-E-16400. Adequate natural ventilation shall be prov
42、ided to permit proper 3.5.2 Accessibility. All units and subassemblies of the equipment shall be easily accessible for replacing plotting paper, adjustment plotting section and the control section access doors shall be equipped with hinges and brackets so that they lock in the open position. Protect
43、ion of the internal subassembl- ies shall be provided in accordance with MIL-E-16400. 3.5.3 Weight and size. The effective plotting area shall be not less than 30 by 30 inches. The vertical thickness of the DRT shall not exceed 6 inches. The overall weight and size of the DRT shall be kept to a mini
44、mum. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-2 7 5 9E ( SI) 3.5.4 The scale of the track shall be adjustable and through a gear shift 200 yards per inch; 1/4 to 0 arrangement shall provide for the following ranges: 1 nautical mile per
45、 inch; 1 to 4 nautical miles per inch; 4 to 16 nautical miles per inch. hundredths of a nautical mile per inch over the lower variable range. The adjustment shall be indicated on a scale reading to 3.5.5 The track shall indicate intervals of time by interruption of the track for approximately 15 sec
46、onds each minute and additonal interruption for 1 minute every 10 minutes. The timing shall be controlled by an 8-day clock which shall be accurate within 3 minutes at all times during a period of 96 hours when wound every 24 hours, irrespective of whether the track timing contacts are in operation.
47、 The contacts shall have ample clearance in the open position, and shall not impose an unduly heavy or variable load on the clock mechanism. 3.5.6 The track shall be clearly defined and shall be uniform irrespective of the position in which the tracer is operated. 3.5.7 Provision shall be made for c
48、onveniently starting the track at any point in the tracking area, correcting the position of the tracking mechanism, changing the scale of the track, and making all other normal operating adjust- ments and observations without moving the auxiliary plotting board. 3.5.8 The tracking device shall not
49、cut, tear, or unduly abrade the chart paper when run back and forth repeatedly over the same course. device shall be satisfactorily protected against breakage of pencil lead when The tracking the tracer is subjected to shock in any position. 3.5.9 Provision shall be made for starting and stopping the mechanism of O the tracer. 3.5.10 Provision shall be made for electrically interchanging the course components to permit shifting the reference axes of the tra
