ATT I PDD_150-ELM-260166_r3.pdf

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USS RAFAEL PERALTA (DDG-115) FY26 SIA BUNDLE#3
Solicitation number
N6264926RA052
Issued by

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This is an Engineering Liaison Memorandum (ELM) for ship repair work at the U.S. Naval Ship Repair Facility in Yokosuka, Japan, dated March 27, 2026. The document specifies installation of structural reinforcement for the leg base of a kingpost on the DDG 115 destroyer, specifically at 02 level, frames 324-333, on the starboard side. The reinforcement addresses missing underdeck reinforcement identified during structural inspection per NAVSEA Class Advisory DDG-51-0004-2025, serving as a short-term resolution until completion of a formal Ship Change Document.

The work requires fabrication and installation of five material components: one carbon steel sheet at 0.1046 inches thick (ASTM A569), two high-strength steel plates (15.3# and 20.4#), three high-strength steel angles (6 x 3/4 FB and 5 x 3 x 1/2 L), per MIL-S-22698 specifications. Installation must comply with referenced technical drawings including unit structural assembly drawings, RAS/FAS fitting fabrication standards, and hull outfit installation zone specifications. The work involves fabrication and installation of reinforcement members with specific dimensional requirements, welding butts per NAVSEA standards and MIL-STD-1689, and removal of existing structure members with matching dimensions. The facility is controlled by the Department of Navy and classified as Controlled Unclassified Information (CUI) with distribution limited to DoD and DoD contractors. The point of contact is Miyakoshi Kaito at 243-5969.

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1. TITLE 2. HULL NO 3. GROUP 4. NO. 5. REV

INSTL OF REINFORCEMENT

FOR LEG BASE OF KINGPOST

DDG 115 150 ELM - 260166 -

6. ICN 7. AUTH OR SCD

38K6115001 N/A

8. DATE 9. ORIGINATOR/CODE 10. CHECKED BY 11. APPROVED BY

3/27/2026 /s/

C250 K.MIYAKOSHI

/s/

C250 A.SOUMA

/s/

C250 A.SOUMA

ENGINEERING LIAISON MEMORANDUM

SHIP REPAIR FACILITY - JRMC

YOKOSUKA JAPAN

Reference Notes:

1. The references and their revision levels listed herein were verified as correct at the time of issue. Later revisions or changes of the cited references may be used if applicable to the work specified. If at any time during the planning or accomplishment of the specified work, the references are found to be incorrect or do not match the work specified, stop work and contact the cognizant technical code.

2. Asterisked (*) references are not required for production work.

REFERENCES:

*(a) DDG51CL-150-7026732 "L", UNIT STRL ARR DWG ASSY UNIT 4710 *(b) DDG51CL-571-6220741 "AN", FABRICATION OF RAS/FAS FITTINGS *(c) DDG51CL-600-7026502 "K", HULL OUTFIT INSTALLATION ZONE 4720 FR 317-FR 338 *(d) DDG51CL-621-6220314 "AN", FABRICATION OF CURT PLATES FR 300-338 BELOW 01 LEVEL

JCN: OD01-L081

Controlled by: DON Controlled by: SRF-JRMC/C241 CUI Category: CTI Distribution Statement: D POC: Miyakoshi Kaito/ 243-5969

DISTRIBUTION STATEMENT D: Distribution authorized to DoD and DoD contractors only; Critical Technology, (3/27/2026). Other U.S.

requests shall be referred to U.S. Naval Ship Repair Facility and Japan Regional Maintenance Center, Yokosuka, Japan, C241

CUI

NOTES:

1. THIS ELM WAS DEVELOPED TO PROVIDE INSTL OF REINFORCEMENT FOR LEG BASE OF

KINGPOST (02 LEVEL, FRAME 324-333, STARBOARD SIDE).

2. BACKGROUND INFORMATION: AS PER NAVSEA PMS421 CLASS ADVISORY

DDG-51-0004-2025, MISSING UNDERDECK REINFORCEMENT OF KINGPOST FAS STAION

NO.7 WAS IDENTIFIED AT 02 LEVEL, FR 317-338, STBD SIDE BY STRUCTURAL

INSPECTION. SHEET 3C9 OF REF (c) DOES NOT SPECIFY ANY UNDERDECK REINFORCEMENT FOR THE KINGPOST OF FAS STATION. HOWEVER, SHEET 97J OF REF (b)

SPECIFIES UNDERDECK REINFORCEMENT. PER DDG-51-0004-2025, THE REINFORCEMENT

IS REQUIRED TO BE INSTALLED IN ACCORDANCE WITH THIS ELM AS THE SHORT TERM

RESOLUTION UNTIL ACCOMPLISHMENT OF SHIP CHANGE DOCUMENT (SCD).

3. REMOVAL NOTE: EXISTING STRUCTURE MEMBER WHERE SHALL BE REMOVED WITH SAME

DIMENSIONS SHOWN ON INSTALLATION PLANS.

4. ADDITIONAL BUTTS IN PLATING MAY BE DETERMINED TO SUIT INSTALLATION AND

AVAILABLE MATERIAL. THE ADDITIONAL BUTTS SHALL MEET THE REQUIREMENT OF

NAVSEA S9086-AB-GOS-010/GSO, NAVSEA S9086-CH-STM-010/CH074-V1 AND

MIL-STD-1689 IN ORDER OF PRECEDENCE.

5. FOR INFORMATION OF HULL STRUCTURES NOT SHOWN ON THIS ELM, SEE REF (a).

6. FOR INFORMATION OF KINGPOST ASSY NOT SHOWN ON THIS ELM, SEE REF (b) AND (c).

7. FOR INFORMATION OF CURTAIN PLATE NOT SHOWN ON THIS ELM, SEE REF (d).

CUI

C U

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C U

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