1、MIL-N-81497A( AS ) AMENDMENT 2 . Amendment-1 15 Mey,1971 MILITARY SPECIFICATION NAVIGATION SET, INERTIAL AN/ASN-84 !Chis Amendment forms a part of Military Specification MILN-81497A(AS) date 15 March i970 and has been approved. by: the Naval Air Systems Command, Department of the Navy. *Page 2, Para
2、graph 2.1: “2.1 specification to the extent specified herein. issues of the documents in effect for the previous procurement. However, in lieu of the issue listed, the contractor shall use the latest issue in effect of these documents where feasible. If the use of the latest issue will affect design
3、 performance, testing, data or interchangeability of any replacement part, then the issue of the document listed below shall be used, Delete and substituke General - The following documents form a part of this Listed are the SPECIFICATIONS ,- y. ._ - - - Military MIL-W-OC Wiring, Aircraft, Installat
4、ion of MIL-E-5400H * MILI-6181 MIL-C-6781B Electronic Equipment, Aircraft, General Specification For Testing, Environmental, Aircraft Electronic Equipment Interference Control Requirements , Aircraft Equipment Control Panel : Aircraft Equipment, Rack or ConsoleMounted MIL-P-7788A Plate, Plastic, Lig
5、hting MIL-M-7793C Meter, Time Totalizing o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81477A (2) 58 779970b 0170984 1 _ MIL-E-175 5 5F MIL-N-18307C MIL-T-19576 MIL-N-81497S (.AS AMENDMEIJT 2 Electronic and.Electrical Equipment and Associat
6、ed Repair Parts, Preparation for Delivery of Test Procedures: Preproduction and Inspection, for Aircraft Electronic Equipment, Format For I?omenclature and Nameplates for Aeronautical Electronic and Associated Equipment Transmitter, Remote Compass Thin Wing Type ML-1 (Unstabilized) Synchros, 60 and
7、400 cycles, General Specification For SPECIFICATIONS Naval Air Systems Command WR-98 Microelectronic Devices Used in Avionics Equipment, Procedures for Selection and Approval of AR-34 Failure Classification for Reliability Testing, General Requirments For MS91403 MIL-STD-704 MIL-S TD-7 81 2 /-? . .
8、. . . . . -. Meter, Time Totalizing, Miniature Digital, li5 volt 400 cycle Cases, Large Size (For Use with Electronic Equipment in Aircraft) Standard General Requirements for Electronic Equipment Electric Power, Aircraft Character- istics and Utilization of Reliability Tests, Exponential Distributio
9、n f U Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81497S(AS ) AMENDMENT 2 MIL-STD-794 Parts and Equipment , Procedures for Packaging and Packing of Federal FED-S TD-5 9 5 Colors Other ARINC 407 synchro Standard anual , ARINC 407-1 AeronautT
10、cal Radio , Inc . PUBLI CATIONS Naval Air Systems Command - EI-554 Avionics Installation Instructions for Navigation Set, Inertial AN/ASN- *Page 4 , Pargra.pM3.2.1 and 3.2.2 : Delete “AR-5“ and substitute “WR-98“. *page-5, Paragraph 3.3.1: Delete “85.0“ and substitute “90.0“. .% Page 5, Paragraph 3.
11、3.2.3: #Page 7, Paragraph 3.3.7.2.3: Delete “750 hours“ and substitute “200 hours“. Add new paragraphs “3.3.7.2.3 Flight Line Maintenance - Navfgation Computer Operation Program Load - Verify Capability - The equipment shall have the capability which will provide a means to load and verify the.ASN-8
12、4 operational computer program, normally stored in the W-924/ASN-84 Navigation Computer Memory, utilizing the existing Central Data Processor interface (3.4.3.4.4). AII appropriate external computer with special test program containing, in part, the ASN-84 operation computer program shall be provide
13、d to complete this capability. .al (i) Load - Verify Maintenance Switch - The navigation computer shall contain a load-verify mafntenance switch which shall be used to allow the equipment to perform load verify operation. (2) simultaneous operation of the load-verify maintenance switch and equipment
14、 turn-on. Load - Verify Operation Restrictions - (a) Load - Verify Operation shall only commence upon the , o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-N-L497A (2) 58 U 9997906 0170986 5 MIL-N-81497A(AS ) Amendment 2 (b) fioiitiiEU qilipi
15、nert aperation ( 3.4 .l. 2) subsequent to load-verifSr opera5idn shall require a removd of system power. EeqUE!IIkia1 load/vrify operation without system shut-dom . I “oagitue It m “veiocity“r (e) The squiBmeilt tgit;a .,we. kon f start of flew word fihall be one logic 3 pds Whith ehali follow & tot
16、al of ten (10) VE andlor TH (b) (12) Belecta. v I ti) &ih6m pi-P&tion EhUl be terminated by a receipt 6f kW6 (E) BC6elBVe VN logic 1 selects without inter- fetihg Vi8 nd(er !& aeects. 4 4 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81497A
17、(AS ) Amendment 2 Velocity East (VE) and True Heading (TH) select signal shall be interpreted as “1“ bit and “O“ bit data to be loaded when they are respectively pulsed to logic 1 status. Minimum select duration: 88 microseconds . Minimum time between select pulses: 12 microseconds. Logic i definiti
18、on: 3.4.3.4.4 (6). Minimum time between successive load operations or successive load-verify operations shall be 600 micro- seconds. Clock signal - not applicable. Data signal - The equipment shall supply 22 bit serial data with all data bits, including channel identifica- tion bits set to zero. Ent
19、er signal - 3.4.3.4.4(10). Navigation Computer memory load shall occur sequentially starting with the first memory word and shall terminate , with the last memory word. (22) The following shall specify the central data processor interface during CP-924/ASN-84 Navigation memory verification operation
20、. The velocity north (VN) select signal shall be designated as both a control signal and as a control for supplying one CP-924/ASN-84 memory data word. Definition of the start of verify operation shall be the receipt of two successive VN logic 1 selects. Definition of the request to transmit CP-924
21、memory word #i shall be a logic VN select. End of verify operation shall be the receipt of two successive VN selects. Velocity East (VE) and True Heading (TH) selects shall be utilized tu select for transmission words 2 and 3 from the (Tp-924 (respectively). The external computer/central data proces
22、sor shall shall VN, VE, !CH consecutively during memory verification. Navigation Computer memory verify shall OCCG Sequentially starting with memory word #1 and shall te+nate with the last memory word. I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
23、,- MIL-N-BL477A (2) 56 9- 7979706 0270980 7 MIL-N-81497A( AS ) Amendment 2 (h) Minimum select duration : 88 microseconds. (i) Minimum time between selects: 12 microseconds. (j) Minimum time between successive memory verification . operations or successive memory verify-load operations shall be 600 m
24、icroseconds. t (k) The equipment shall provide an enter signal (logic i) within 1 Mllisecond after receipt of a select signal. The select signal shall not be terminated unless the equipment has supp&ied an enter signal or 1 MS of elapsed time has occurred. (i) Logic levels shall be in accordance wit
25、h 3.4.3.4.5(6). (m) Clock signal shall be in accordance with 3.4.3.4.5.(7). (n) The output serid data format shall be: Velocity North (1st 10 Bit Memory Word) Velocity East (2nd 10 Bit Memory Word) *Page 25, Paragraph 3.4.3.4.5(1): Before “All other times, circuit is closed“, Add “Mavigation Compute
26、r Load verify operation in process .“ *Page 30, Paragraph 3.5.2.4: Delete 1 Torquer Control 1 Magnetic Heading Pre-Amplifier 9 Relay Drivers 7 Lamp Drivers“ o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81497A( AS I Amendment 2 . *Page 3, P
27、aregraph 3.5.2.5.2: Delete and Substitute “3.5.2.5.2 - Self Test Push Button Switch - (1) The self test push button switch provided shall be used to- initiate the eqGpments self test submode when the mode select or switch on the Control, Navigatioo is in the standby . mode. (2) of operations to vaii
28、date fail lamp indications.“ Parqgraph 3.5.2.5.3: Delete “standby not required“ and The self test push button switch shall be used in all modes *page 319 substitute “Mode - Standby/Self Test Function Used for initiai course True Heading Control of gyroscope As s embly . *Page 39, Paragraph 3.5.4.3:
29、Delete “19.9 pounds“ and substitute Delete “+ 55 Deg C“ and substitute “- 1 Deg C“. “20.2 pounds“. *Page 41, Paragraph 3.5.4.9: 41, Paragraph 3.5.4.U: Delete and Substitute 113.5.4.ii Gnoscope Assembly Environmental Limitations - The Gyroscope Assembly shall operate within the accuracies consistent
30、with the requirements of 3.4.2 for ambients between -54 and +55 deg. C.“ *Page 42, Pwagraph 3.5.5.2: Delete “17.03 inches“ and substitute Add to last s$ntence “exclusive of the load “17.73 inches“. verify maintenance switch, . *Page 42, Paragraph 3.5.5.3: Delete “21.65 pounds“ and substitute “22.15
31、ponds“. *Page 43, Paragraph 3.5.5.4: Delete “5 Input/Output Logic Cards“ and Add l1 Quant i ty Nomenclature 4 xput/utput Ixigic Cards 1 -6 voit requiator 1 Master Oscillator 1 Load-Verify Switch Ass&blyl -age, Paragraph 3.5.5.15: Correct 4J5 to be “MS3122-22E-55SY“. Provided by IHSNot for ResaleNo r
32、eproduction or networking permitted without license from IHS-,-,-MIL-N-81 4 97A ( AS ) Amendment 2 *Page 48: Add “3.5.5.18 - Load Verify Maintenance Switch - The Computer, Navigation shall contain a load-verify push button switch assembly which shall be chained to the unit and shall mate to test con
33、nector 46. *Page 48, Paragraph 3.5.6.3: Delete “23.6 pounds“ and substitute “27.6 pounds“. *Page 50, Paragraph 3.5.6.5.3(1): Delete n80“ and substitute “100“. *Page 50, Paragraph 3.5.6.5.3(2): Delete *Page 51, Paragraph 3.5.6.12 : Correct 2J4 to be “MS3112-E-18-32PN“. Page 56, Paragraph 4.4.1.3, Lin
34、e 6: Add “This test shall be deletedif the reliability test includes a test on each equipment which consumes at least ten hours of operation.“ Page 56, Paragraph 4.4.1.3. Under VIBRATION: Delete “20 to 30 cps“ and “+3Gs“ - and substitute “20 to 70 Hz“ and I+ - 2Gc“. Page 58, Paragraph 4.4.3.1, Line
35、6: Delete “All shall be used“ and substitute “shall be used except that the lower temperature chail be -25OC.I Page 58, Paragraph 4.4.3.2, Line 4: Add “except that the lower temperature shall be -25OC.I Page 58, Paragraph 4.4.3.2.1, Lines 4 and 5: Delete the sentence starting “If the burn-in period
36、. . . . . . . .I and subsitutute “If the burn-in period is to be used, the procuring activity shall be notified of the details thereof.“ Page 59, Paragraph 4.5: Delete and substitute 4.5 longevity Test - This test shall be of 500 hours duration and shall be conducted on one (1) CP-924/ASN-84 navigau
37、on computer that has passed the reliability test. the navigation computer sample and shall be responsible for accomplish- ing the longevity test. by the government inspector and initiation of test shall be authorized by NAVAIR, Code AIR-5337. !The contractor shall furnish The longevity test sample s
38、hall.be selected ! 3 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 60, Paragraph 4.5.1: Delete and substitute “4.5.1 Test Conditions - The longevity test shall be conducted in accordance with BL-STD-, Test Level E except that the lower tempe
39、rature shall be -25C.l Page 61, Paragraph 4.6, Line 2: Delete “life tests“ and substitute “longevity tests“. * An asterisk preceding a change denotes a change which did not appear in Amendment 1. Project Number 5826-No0 9# _ - - 7- o Provided by IHSNot for ResaleNo reproduction or networking permitt
40、ed without license from IHS-,-,-MIL-N-81497A (2) 58 H 7777906 0370772 O W -_ m- o H “? o - 0 H O v) O P O b 0 H s In t- O U3 * * 0 H Y? In O0 A U. S GOVERNMENT PRINTING OFFICL 1972- 714- 166/7 150 M-N-81497A( AS ) Amennent 2 * * * * * J Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
