OE-254_antenna_change_MWO11-5985-357-30-1_1991.pdf

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1、LIMITED URGENT MWO effective date is 1 February 1991 and completion date is 1 August 1991. MWO 11-5985-357-30-1 MODIFICATION WORK ORDER MODIFICATION OFANTENNA GROUP OE-254/GRC (NSN 5985-01-063-1574) Headquarters, Department of the Army, Washington, DC 1 February 1991 REPORTING ERRORS AND RECOMMENDIN

2、G IMPROVEMENTS You can help improve thiS MWO. If you find any mistakes or if you know of a way to improve the procedures please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publica- tions and Blank Forms) to: Commander, US Army Communications-Electronics Command and Fort Mon

3、mouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey 07703-5000.In either case, a reply will be furnished direct to you. 1.PURPOSE OF MODIFICATION. The purpose of this modification is to extend the life expectancy of existing OE-254/GRC antenna support sleeves, mast sections, and mast and base ass

4、embly. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes.This determination was made on 15 April l990.Other requests for this document will be referred to Commander, US Army Communications-Electronics Command

5、and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, NJ 07703-5000. DESTRUCTION NOTICE- Destroy by any method that will prevent disclosure of contents or reconstruction of the document. 1 MWO ll-5985-357-30-1 2. PRIORITY. This modification is classified as LIMITED URGENT as a result of an Operati

6、onal Safety of Use/Flight Message 201800Z MARCH 1990. Operating restrictions provided therein remain in effect until this modification is applied. 3. END ITEM OR SYSTEM TO BE MODIFIED. NomenclaturePart No.CAGESerial No. Antenna Group5985-01-063-1574OE-254/GRC80058 All OE-254/GRC NSN 4. MODULES (COMP

7、ONENTS, ASSEMBLIES, SUBASSEMBLIES, BOARDS AND CARDS) TO BE MODIFIED. The following item, Whether installed or in depot stock, shall be modified. Nomenclature NSNPart No. Cage Quantity_ Mast Assembly5985-01-124-5430AB-1244A/GRC80058 1 5. PARTS TO BE MODIFIED. The following items, whether installed or

8、 in depot stock, shall be modified. Stocked parts shall be modified prior to issue and shall be marked so that it can be easily determined that modification has been accomplished. Nomenclature Antenna Support Sleeve (upper) Antenna Support Sleeve (Iower) Mast Section (Lower) Mast Section (upper) Mas

9、t and Base Assembly 6. APPLICATION. NSN 5985-01-072-8016 5985-01-072-8015 5985-01-072-8065 5985-01-072-8066 5985-01-124-5431 a. Time compliance schedule. 1 February 1991 and its completion Part No.CAGE Quantity SM-D-65928680063 1 SM-D-65927980063 1 SM-C-65927680063 5 SM-C-65928380063 5 A300286880063

10、 1 The efftive date of this MWO is date is 1 August 1991. b. Level of maintenance. Direct Support is authorized to apply this MWO. 2 Work Force/Skills One Direct Support MWO 11-5985-357-30-1 Requirements Man-hours Level Repairer2.5 Not 7. 8. c. MWO to be applied prior to or concurrently with this mo

11、dification l Applicable. TECHNICAL PUBLICATIONS AFFECTED/CHANGED AS A RESULT OF THIS MWO. a. TM 11-5985-357-13, 1 February 1991. b. TM 11-5985-357-23P, 15 June 1988. MWO KITS, PARTS, AND DISPOSITION. a. Kits/Parts needed to apply the MWO.Not applicable. b.Contents of MWOkit. Not applicable. c. Bulk

12、and expendable materials. NSNCAGE PART NO.QUANTITY 7520-00-973-1059 Black Felt Tip Marker81348 GG-M-00114 1 (or equivalent) d. Parts DispositionNot applicable. NOMENCLATURE 9. SPECIAL TOOLS; JIGS; TEST MEASUREMENT,AND DIAGNOSTIC EQUIPMENT (TMDE);AND FIXTURES REQUIREDG NSN 5180-00-605-0079 NOMENCLATU

13、RECAGEPART NO. Quantity Tool Kit, Electronic80058 TK100/G 1 Equipment TK-100/G Pipe cutter1 Lathe (optional)1 10. MODIFICATION PROCEDURE. a. Disassembly/Assembly.Refer to TM 11-5985-357-13 for OE-254/GRC antenna disassembly/ assmebly instructions. b. Inspection.Inspect antenna support sleeves and ma

14、st sections for stress cracks at the squared corners of the notch. Antenna support sleeves and mast sections with stress cracks greater than 2.50 inches or that are noticeably deformed or bent should be turned in for disposition and replaced. Antenna Support sleeves and mast sections with stress cra

15、cks that are less than 2.50 inches can modified. 3 MWO 11-5985-357-30-1 ANTENNA SUPPORT SLEEVE AND MAST SECTION 11.Procedures a. Antenna Support Sleeves and Mast Sections. CAUTION Do not attempt to cut the antenna support Sleeve and mast section tubes with the pipe cutter. NOTE As an optional proced

16、ure, the antenna support Sleeve and mast section tubes can be cut with a lathe, if available. Using a sharp pipe cutter, lightly score line around each tube 2.50 inches from the notched end. Cut each (1)a guide cut tube using a hack saw. Ensure that each cut is made perpendicular to the antenna supp

17、ort sleeve and mast section to achieve a proper fit with the mating section. After cutting,remove burrs and sharp edge with a file. NOTE Ensure that the cut end support sleeve and mast of any cracks. (2) Inspect the tab on the mast sections. Inspection will reveal of each antenna section is free low

18、er antenna support sleeve and one of two types of tabs. Remove the metal tabs by filing off the tabs with a metal file. The punched-out tabs require hammering back of the tabs. Tap the tab using a ballpeen hammer to just inside of the outer diamter of the lower antenna support sleeve or mast section

19、. NOTE Take care when hammering the tabs not to punch them completely through, as this may induce a stress area. 4 MWO 11-5985-357-30-1 Tabs or Drift (Roll) Pins MAST AND BASE ASSEMBLY b. Mast and Base Assembly.Inspect the mast and base assembly. Inspection will reveal either the same types of tabs

20、as described for the lower antenna support sleeve and mast sections, or metal drift pins. Remove the metal drift pins with a punch and hammer. Use the same method of modification for those with tabs, as described for the lower antenna antenna support sleeve and mast sections tabs. c. Replace broken

21、orunrepairable antenna support sleeves, mast sections, or mast base with modified antenna support sleeves, mast sections, or mast base. 11 GCALIBRATION REQUIREMENTS. Not applicable. 12. WEIGHT AND BALANCEDATA. Weight and balance are not significantly affected. 13. QUALITY ASSURANCE REQUIREMENTS. Not

22、 applicable. 14. RECORDING AND REPORTING OF THE MODIFICATION. a. Records andreport forms. Prepare in accordance with DA Pam 738- 750 as contained in Maintenance Management Update. b.Completion of DA Form 2407 or DA Form 5504, Maintainance Request. After completing the DA Form 2407 or DA Form 5504, m

23、ail the NMP copy (copy 2) to: Commander,US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-PP,Fort Monmuth, New Jersey 07703-5000. Mail the control copy (copy 3)toCommander, US Army Depot System Command, ATTN: AMSDS-PM, Chambersburg, PA 17201, for PAC 98 (NonAIF Field Ac

24、tivities).Forward the Organizational copy (copy 4) as directed by local commander. c. Marking equipment. Specific marking instructions for the reidentification of modified items are: (1) Antenna Group OE-254/GRC or Mast Assembly.After a complete antenna has been modified, mark the carrying case. Usi

25、ng a black felt tip marker: (a) Print the word“MODIFIED” on the front cover of the carring case in the space which is located below the manufacturers CAGE nunber and above the serial number. 5 MWO 11-5985-357-30-1 (b) Mark an “X” across the entire yellow parts list label (P/N SM-D-944782) on the ins

26、ide cover of the carring case. (The part numbers are now as listed in paragraph 14.d.) (c) Mark an “X” across the ERECTION procedure paragraph and Figure 3 on the yellow assembly and erection procedure label (P/N SM-D-944780) on the inside cover of the carrying case. (The two person erection procedu

27、re is deleted in TM 11-5985-357-13 dated 1 February 1991.) (2) Antenna Support Sleeve or Mast Section. Rubber stamp, if available, or scratch the word “MODIFIED in the CARC paint on the bottom side of each tube. (3) Mast and Base Assemblv.Rubber stamp, if available, or scratch the word MODIFIED in t

28、he CARC painted part of the base. d.Identification data. Nomenclature Before Mod. After Mod. Before Mod. After Mod. Before Mod. After Mod. Before Mod. After Mod. Before Mod. 6 Antenna Group OE-254/GRC Mast Assembly Mast Assembly Antenna Support sleeve (Upper) Antenna Support sleeve (Upper) Antenna S

29、upport sleeve (Lower) Antenna Support Sleeve (Lower) Mast Section (Lower) CAGE and Part Number 80058 / OE-254/GRC *NO CHANGES* 80058 / AB-1244A/GRC 80058 / AB-1244B/GRC 80063 / SM-D-659286 80063 / A3159902 80063 / SM-D-659279 80063 / A3159895 80063 / SM-C-659276 NSN 5985-01-063-1574 5985-01-124-5430

30、 5985-01-324-3461 5985-01-072-8016 5985-01-326-5533 5985-01-072-8015 5985-01-327-1448 5985-01-0-8065 MWO 11-5985-357-30-1 After Mod. Before Mod. AFTER Mod. Before Mod. After Mod. Mast Section80063 / A31598925985-01-324-3462 (Lower) Mast Section80063 / SM-6592835985-01-072-8066 (Upper) Mast Section80

31、063 / A31598995985-01-324-3463 (Upper) Mast and Base80063 / A30028685985-01-124-5431 Assembly Mast and Base80063 / A31598905985-01-324-3464 Assembly 15. MATERIEL CHANGE (MC) NUMBER.This MWO is authorized by MC No. 1-90-07-0017. 16. MODIFICATION IDENTIFICATION. This MWO consists of cutting 2.50 inche

32、s off the notched end of the antenna support sleeves and mast sections; filing off the metal abs or hammering in the punched-out tabs on the lower antenna support sleeve, mast sections, and mast and base assembly; and punching out the metal drift pins on the mast and base assembly that does not have

33、 metal tabs or punched-out tabs. By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff Official: THOMAS F. SIKORA Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form 12-51E, block 2504, Operator, Unit, and Direct Support/General Support Maintenance requirements for MW0 11598535730-1. 7 / (8 blank) PIN: 049646-000