408 REVA_Antenna Coupler Maint.pdf

USNS Lenthall

( TAO 189 )

COMMUNICATION AND NAVIGATION CONTRACT NO. N32205-21-R-4006

ITEM NO. 0408 REV. A CATEGORY "A" 2020-06-25

Antenna Coupler Maintenance Coleman Ray

0408 - 1

1.0 ABSTRACT

1.1 Clean, inspect and refurbish Antenna couplers/tuners listed in paragraph 3.1

2.0 REFERENCES/ENCLOSURES

2.1 References:

2.1.1 AN/URA-38A Antenna Coupler Group Technical Manual NAVELEX

0967-LP-297-6010.

2.1.2 AN/URT-23D TECHNICAL MANUAL: EE150-FV-OMI-010_0_2 /

0913-LP-005-3900.

3.0 ITEM LOCATION/DESCRIPTION

3.1 Location/Quantity:

3.1.1 CU 938C/AN-URA-38 antenna coupler, AN/URA-38/RF-601 antenna coupler or Antenna Term box:

LVL FRAME P/S/C QTY

CPLR., RF-601 07 65 P/S 2

CPLR., RF-601 06 101 P/S 2

TERM. Box KPST 35 S 2 TERM. Box KPST 44 P 1

3.2 ITEM DESCRIPTION/MANUFACTURERS DATA: None

4.0 GOVERNMENT FURNISHED EQUIPMENT /MATERIAL/SERVICES:

4.1 None

5.0 NOTES:

5.1 The contractor and all subcontractors, regardless of tier must consult the General Technical Requirements (GTR) to determine applicability to this work item. In performance of this work item, the contractor and all subcontractors regardless of tier must comply with the requirements of all applicable GTR’s including but not limited to GTR’s 1 through 7, 22, 23, 24, 28 and 29.

COMMUNICATION AND NAVIGATION CONTRACT NO. N32205-21-R-4006

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5.2 The contractor and all subcontractors, regardless of tier are advised to review other work items under this contract to determine their effect on the work required under this work item.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 None additional

7.0 STATEMENT OF WORK REQUIRED:

7.1 Arrangements/Outfitting: None additional

7.2 Structural:

7.2.1 The prime contractor will provide crane and rigging services along with proper staging underneath the 06 and 07 HF transmit antenna platforms in order to accomplish disassembly, removal, and installation of HF whip antennas as well as preservation of antenna platforms. Crane services are to be provided for the removal and replacement of the three HF receive whip antennas forward.

7.2.2 The contractor shall remove rust and scale per SP-6 standards from the top and bottom of the entire four (4) triangular shape transit whip foundations located port and starboard sides, 07 level, frame 65 and port and starboard sides, 06 level, frame 101.

7.2.3 The contractor shall remove rust and scale from the three (3) receiver whip and receiver coupler foundations in 3.1.1 per SP-6 standards.

7.2.4 The contractor shall bead blast all four (7) AS-2537 antennas, prime, and paint using powder coat method.

7.3 Mechanical/Fluids: None additional

7.4 Electrical:

7.4.1 Upon completion of initial testing tag out all radio transmitters in accordance with contractor and MSC Electrical safety regulations. Notify the electrical tag out officer for annotation in the ship’s tag log book.

Upon completion of antenna overhaul and reinstallation clear the tag out and once again notify the ship’s tag out officer to clear the log book.

7.5 Electronic:

7.5.1 Perform initial test of antenna systems.

7.5.2 Perform a Megger test on all whip antennas. Additionally, the contractor shall perform a live operation and VSWR test of all antennas using the parent transmitter and independent thru-line test set. NOTE: VSWR should be in range as specified in antenna tech manual. Allow a 10% tolerance for variance of installations and accuracy of tests. Record and submit test results to MSC REP in writing within 48 hours of the test procedure. Test deficiencies shall be reported to the MSC REP with report

COMMUNICATION AND NAVIGATION CONTRACT NO. N32205-21-R-4006

0408 - 3 of further recommended action required. This test is to be repeated after reinstallation of overhauled couplers.

7.5.3 Disconnect and remove all equipment listed under paragraph 3.1 using reference 2.1.1 for guidance. Transport to the contractor’s shop for overhaul. Reinstall equipment on the ship as original upon completion of overhaul.

7.5.4 Preserve all coupler, aluminum label plates and converter decal/warning stickers and labels during refurbishment. Provide new decal/label plates for the ones found damaged and/or missing.

7.5.5 Perform maintenance and testing on couplers in accordance with references 2.1.1 and 2.1.2. Ensure that all cable connector ends are weatherized to prevent element intrusion while disconnected from the antenna or coupler.

7.5.6 Mechanically clean the coupler foundations including underside of foundations and supporting brackets and coupler platforms to remove all scale, rust, and corrosion.

7.5.7 Clean the equipment, removing all dirt, grime, corrosion, and salt spray.

7.5.8 Apply two (2) coats of epoxy gray (NSN 8010-01-350-4741) paint to the surfaces of the couplers. Contractor shall provide and replace coupler pressure gauges with new.

7.5.9 Reinstall couplers in original locations with new gaskets. Replace missing corona shields, and mount to foundations with stainless steel CRES 316 hardware. Contractor shall provide and replace missing, or deteriorated bond straps and install in accordance with MIL-STD-1310(G). The contractor shall provide and install NEW CRES 316 Stainless steel hardware, i.e. nuts, bolts, flat and lock washers to mount all couplers.

Apply a liberal coating of conductive anti-seize to all bolt threads.

7.5.10 Reconnect antenna/coupler leads to antennas, and weather-seal all connections at the antenna and coupler using vinyl electrical tape (three Full wraps) , self vulcanizing rubber tape (three Full wraps) , and 3M type weather sealer.

7.6 Preparation of Drawings: None additional.

7.7 Inspection/Tests

7.7.1 Perform a Megger test on all whip antennas. Do not Megger Dipoles.

Additionally, the contractor shall perform a live operation and VSWR test of all overhauled antennas and couplers using the parent transmitter and independent thru-line test set. Record and submit test results to MSC REP in writing within 48 hours of the test procedure. Test deficiencies shall be reported to the MSC REP with report of further recommended action required.

7.7.2 Perform an operational test on all AN/URA-38 couplers in accordance with the Manufacturer’s technical manuals and reference 2.1.2. Perform visual

COMMUNICATION AND NAVIGATION CONTRACT NO. N32205-21-R-4006

0408 - 4 inspection of couplers and test the nitrogen pressure in each. Submit pressure test results to the MSC REP in writing within 48 hours of testing.

7.7.3 The contractor shall contact the MSC REP upon completion of coupler antennas for inspection prior to reinstallation.

7.8 Painting

7.8.1 Apply two (2) coats of Amercoat 240 and a finish coat of Amershield Haze gray paint to match surrounding areas.

7.9 Marking: None additional

7.10 Manufacturers Representative

7.10.1 The contractor shall engage the services of a qualified Electronic COMM Systems representative to perform all work in this spec item.

8.0 GENERAL REQUIREMENTS:

8.1 None additional