1、-. MIL-C-23697 bb 999990b 0332387 5 W M I L-C-23697 (WEP) 15 JULY 1963 MILITARY SPECIFICATION Computer Set, Navigational A N/ASN- 4 2( * ) This specification has been approved by the Bureau of Naval Weapons, Department of the Navy, 1. SCOPE 1.1 Scope - The equipment covered by this specification sha
2、ll, when integr ted with doppler ground velocity sensor, provide accurate navigational outputs for Naval aircraft. 1 1.2 Classification - The Navigational Computer Set AN/ASN-42 shall consist of the follow- ing items: DESCRIPTION Gyroscope Assembly Mounting,Gyroscope Assembly Computer, Navigational
3、Mounting Power Supply Mounting Control, Navigational Computer Set (Alignment Control) Converter, Signal Data Mounting Amplifier, Electronic Control Mounting Control, Gyroscope Assembly Control, Inertial Navigation TYPE DESIGNATION APPLICABLE PARAGRAPH CN- 793/ASN- 42 MT-ZOO/ASN- 28 CP- 6 3 2/ASN- 4
4、2 M T- 295 9/ASN- 4 2 PP- 3100/ASN-42 MT- 2962/ASN-42 C- 3833/ASN-42 CV- 1227/ASN-42 MT-2961/ASN-42 AM- 31 13/ASN-42 M T- 29 6 O/ASN- 4 2 C- 38 32/ASN- 42 C-4061/ASN-42 3.4.1 3.4.2 3.4.3 3.4.4 3.4.5 3.4.6 3.4.7 3.4.8 3.4.9 3.4.10 3.4.11 3.4.12 3.4.13 1.3 Associated Equipment - The equipment shall op
5、erate with the following associated equipment which shall not be supplied as part of the equipment. Navigator Computer, Doppler/Air Mass, AN/ASA- 47 Attitude - 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-23b77 bb 7979306 0132188 7 MIL- C
6、- 23697(WEP) 1.3 Associated Equipment (Coiitiiiued) Remote Compass Transmitter, Type ML- 1 AN/ARN-21A or AN/ARN-52 TACAN MW- 2 (MS 28090- 1) Compass Repealer Indicator Indicator Group AN/ASA-l6 Navigational Plotter, PT- 396/AS Flight Statioii Plotter, PT-GS4/ASA-13 Power Supply and Relay Unit Dopple
7、r Radar Set AN/APN-l22(V) Doppler Radar Set AN/APN-l53(V) 2. APPLICABLE DOCUMENTS 2.1 General - The following documents of the issue in effect on the date of iiivitntioii for bids form a part of this specification to the extent speciied herein: SPECIFICATIONS Military MIL- E-4682 Electron Tubes and
8、Transistors, Choice and Application of MIL- W-5088 Wring, Aircraft, Installation of MIL- E-5400 Electronic Equipment, Aircraft, General Specification of Testing, Environmental, Aircraft Electronic Equipme iit Interference Limits, Tests and Design Requirements, Aircraft Electrical and Electronic Equi
9、pment Control Panel; Aircraft Equipment, Rack or Console Mounted MIL- T- 5422 MIL- I- 61 81 MIL- C- 6781 MIL-M-7793 Meter, Time Totalizing MIL- E- 7894 MIL-E-17555 Electric Power, Air craft; Characteristics of Preparation for Delivery of Electronic Ei,uipmeiit, Miscellaneous Electrical Equipment (ex
10、cept Rotating Electrical Equipment) anci Associated Repair Parts MIL- T- 18 303 Test Procedures; Preproduction and Inspection, for Aircraft Electronic Equipment, Format for Nomenclature and Nameplates for Airborne Electroiiic and Associated Equipment Reliability Assurance for Production Acceptance o
11、f Avionic Equipment; General Specification for . _-. MIL- N- 18307 MILR- 23094 STANDARDS Fed er a 1 FED-STD-595, March 1, 1956 Colors Military - MS-28073 Meter, Time Totalizing, 115 Volt 400 Cy Rev B Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
12、L-C-23697 66 m 9979906 0132187 9 m fl -, 2.2 Availability of Documents (1) When requesting specifications, standards, drawings and publications refer to both title and number, Copies of this specification and applicable speci- fications required by contractors in connection with specific procurement
13、 functions may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code DCS, 5801 Tabor Avenue, Philadelphia 20, Pennsylvania. 3. REQUIREMENTS Parts and Materials - In the selection of parts and materials, fulfillment of major (1) Parts and materials requirements shall confor
14、ln to Specification MIL- E-5400. (2) Nonrepairable subassemblies, as outlined in Specification MIL- E-54 00, shall be used when practicable. The general size of the subassembly and the amount of circuitry to be included therein shall be approved by the procuring activity, Nonrepairable subassemblies
15、 must be reliable, (See 6.4) - 3.1 design objectives shall be the prime conaideration. In so doing the following shall govern: 3.1.1 Nonstandard -_- Parts and Materials kPproval - Approval for the use of nonstandard parts and materials shall be obtained as outlined in Specification MIL- E-5400. 3.1.
16、2 Electron Devices - Electron tubes, transistors and diodes shall be chosen and applied, and the complements reported as outlined in Specification MIL- E-4682. The complement report must be submitted to the procuring activity for review and approval prior to preproduction testing. 3.2 Design and Coc
17、struction - The equipment shall conform with all the applicable requirements of Specification MIL-TWfor design, construction and workmanship, except as other- wise specified herein. minimum consistent with good design and shall not exceed 180 pounds, 3.2.1 , Total Weight - The total weight of the eq
18、uipment, excluding cables shall be a 3. 2. 2 Reliability 3. 2. 2.1 Operational Stability - The equipment shall operate with satisfactory performance, continuously or intermittently forriod of at least 50 hours without the necessity for readjustment of any controls which are inaccessible to the opera
19、tor during normal use. 3.2.2.2 Operating Life - The equipment shall have a minimum total operating life of 3000 hours with reasonable servicing and replacement of parts. Parts requiring scheduled replacement due to wear during the life of the equipment, and the wearout life of such parts, shall be d
20、etermined by the contractor and submitted to the procuring agency. 4.4.3, tne mean (operatingpime between failures shall be 80 hours. Procedure i1 of Specification MIL-R-23094 shall be used. 3.2.2.3 Reliability In Mean Time Between - Failures (MTBF) - For the test program under -_ _-_ 3.2. 2.4 Time
21、Totalizing Meter - The equipment shall contain time totalizing meters in accordance with Specification MIL-M- 7793. Elapsed time indicators shall b,e provided for both the Doppler System and the Navigational Computer Set. Both indicators shall be located in the Signal Data Converter and shall have a
22、 maximum scale of 10,000 hours. 3.2.3 3.2.3.1 - Cabling and Connections - =les and Connectors- The equipment shall provide for the use of cables and connectors in accordance with Specification MIL-E-5400. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
23、-,-,- - MIL-C-23b7 66 77777Ob 0332370 5 E MIL- C- 23697(WEP) 3.2.3.2 Interconnection Cabling - The equipment shall be capable of satisfactory operation usrng external wiring in accordance with the applicable requirements of Specification MIL-W-5088. The external wiring shall be unshielded, except th
24、at a minimum number of the individual wires may be shielded when demonstrated as necessary to meet interference control requirements and provided the assembly of the cable to its plugs may be easily accomplished. External cables and that portion of the connectors attached to the cables shall not be
25、supplied as part of the equipment. 3.2.4 Control Panels - All rack or console mounted control panels shall conform to the applicable requirements of Specification MIL- C-6781. The configuration of all control panels must be approved by the procuring activity prior to preproduction testing. The color
26、 of the control panels shall conform to the following: Outer Backing Coating Plate Knob Lamp Holder Color Color Filter Color *Gray *Gray Black Clear *Gray *Gray Black Clear - C-4061/ASN-42 Black Black Black Black Aviation Red I* Color number 36231 Federal Standard Number 595 (Lusterless Dark Gull Gr
27、ey) i 3.2.5 Interchangeability - The equipment shall meet the interchangeability Pequirements as defined in Specification MIL-m00. 3.2.6 Interference Control - The generation of radio interference by the equipment and the vulnerability of the equipment to radio interference shall be controlled withi
28、n the limits of Specification MILI-6181. 3.2.7 Maintenance Provisions and - Field Testing - Provisions for maintenance shall be as specified in Specification MIL-E-5400. Specific test points and test facilities shall be provided to the greatest extent practicable for ease of field testing and mainte
29、nance, 3.2.8 Nomenclature and Nameplates - Nomenclature assignment and nameplate approval for equipment identificationhal1 be in accordance with Specification MIL- N- 18307. 3.2.9 Standard Conditions - The following conditions shall be used to establish normal Room ambient (25“ C I5“C) performance c
30、haracteristics under standard conditions and for making laboratory bench tests. Temperature Altitude Normal ground Vibration None Humidity Input power Service Conditions - lhe equipment shall operate satisfactorily under any of the Room ambient up to 90% relative humidity 115 11. O V AC and/or 27.5
31、IO. 5 V DC 3.2.10 environmental service conditions or reasonable combination of these conditions as specified in Spec- ification MIL-E-5400 for Class 1 equipment, except as modified herein: 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2369
32、3 66 m 9997706 0132191 7 m MIL- C- 23697(WEP) 3.2.10.1 Vibration - When normally mounted (with vibration isolators in place, if any), the equipment shall operate satisfactorily when subjected to continuous vibration within the frequency range of 5 to 500 cps, and having a double amplitude of O. 036
33、inch in any direction, with a maximum acceleration of log (except that the acceleration may be reduced to 2g for the Gyroscope Assembly), whichever is the limiting value. Except for the Gyroscope Assembly, equipment which is normally mounted on vibration isolators shall operate satisfactorily with i
34、solators removed when subjected to 2gs, , O1 inch double amplitude vibration within the frequency range of 5 to 500 cps in accordance with curve II of MIL- E-5400. 3.2.10. 2 Temperature - Five (5) pounds per minute of cooling air at not more than 110“ must be available to Gyroscope Aszmbly, CN-793/A
35、SN-42 for any operation in ambient of over 110F. Cooling air is not supplied by the Inertial Navigation equipment. 3.2.10.3 Shock - This equipment shall operate satisfactorily when subjected to the shock conditions specified in MIL-E-5400, except that the shock amplitude of 15g will be reduced to lo
36、g for the Gyroscope assembly. In addition, the equipment and its mounting shall be so designed and con- structed that the equipment shall not tear loose from its mounting when subjected to an anticipated ditching shock of 16g along the longitudinal axis of the airplane. Warm-up and Align Time - The
37、equipment shall be capable of operating within the specified performance tolerancesaftern-gn time of 20 minutes at temperatures above 25“ C, 30 minutes for temperatures from 0C to and including 25C; 45 minutes for temperatures from -45C to and including 0C. The above requirements apply for initial a
38、lignment and operation within the latitude of North 70“ and South 70“ and after initial rough alignment to within Is“ of local level and true North. 3.2.11 3.2.12 Input Power Requirements - This equipment shall meet all applicable re- quirements of Specification MIL-E-7894 except as modified herein.
39、 AC Voltage Limits - The line to neutral steady state voltage will be nominally 115 volts plus or minus 5 volts with fault limits of 103 to 129 volts. These faults may exist for an in- definite length f time during which the system may operate with decreased performance, but shall not be damaged. Vo
40、ltage Transient Limits - Voltage transients will be within the transient en- velope shown on Figuremansients which exceed the fault limits of Paragraph 3.2.12.1 will exist for a maximum of 5 volt-seconds. The equipment shall not be damaged when these transients occur. 3.2.12.1 3. 2.12.1.1 3. 2.12.1.
41、 2 Overvoltage - Overvoltage will be limited in accordance with the overvoltage curve shown in Figure 1. Overvoltage conditions exceeding the fault limits of Paragraph 3.2.12.1 will exist for a maximum of 5 volt-seconds. Phase Balance - - Voltage unbalance will not exceed 4% under normal conditions.
42、 Voltage Modulati- - Voltage modulation will not exceed 2%. Undervoltage Protection - - The equipment shall not be damaged by voltages AC Frequency Limits - - The normal power system frequency will be 380 to 3. 2.12.1.3 All three-phase equipment shall present a balanced load insofar as practicable.
43、3.2.12.1.4 3.2.12.1.5 below the minimum specified. 3.2.12. 2 420 CPS. The over/under frequency limits are 360 15 and 425 15 CPS. . Under certain ground oper- ating conditions, these frequency limits may exist for 5 seconds maximum and under these conditions, no damage to the equipment shall occur. 3
44、.2.12. 2.1 Harmonic Content - No harmonic will exceed 5%. The crest factor will be 1.41 110%. 3. 2.12. 2. 2 Frequency Modulation - The contractor shall declare any susceptibility of the equipment to frequency modulation and shall indicate the tolerable amplitude limits over any critical band. -.- I
45、-. - ., - *_ ,- 5 i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23677 66 7977706 0332372 7 i MIL- C-23697(WEP) 3.2.12.2.3 Underfrequency - Protection - The equipment shall not be damaged by frequency voltage value combinations falling withi
46、n the shaded envelope defined by Figure 3. 3.2.12.3 DC Voltage Limits - The steady state voltage limits for DC power will be with- in the limits of 24 to 30 volts, except that the limits for the “Emergency (generator out)“ condition will be between 14 and 29 volts. 3.2.12. 3.1 Transient Limits - Vol
47、tage transient limits will be within the envelope shown on Figure 2. The equipment shall notrequire recycling when these transients occur. 3.2.12.3.2 Overvoltage - The equipment shall not be damaged when subjected to voltages above the normal and below the overvoltage limit of the curves shown on Fi
48、gure 2. 3.2.12.4 Power Interruptions - During and at the beginning of operation AC power may be interrupted in a feeder to one or more phases. The equipment shall not be damaged by such fail- ures and shall stay within specified accuracy following the occurrence of two .O60 second interruptions per
49、flight; interruptions to be time separated by at least five (5) minutes. allowable if such failures are more frequent. Any transient beyond lower transient envelope of Figure 1 shall be considered a power interruption. Decreased accuracy is 3.2.12.5 Total Power - The total AC primary input power requirement for this equip- ment shall not exceed 1.4 KVA. 3. 2.13 Standby Provisions - The equipment shall provide for a standby position whe
