38NBA16905_00_A01.pdf

Ship/HULL NO. Ship/HULL NAME

LCU-1651 NBU-7

TITLE:

Prefabrication of Bow Ramp ; accomplish

1 . SCOPE:

JON:

ICN:

38NBA16905

1.1 Title: Prefabrication of Bow Ramp ; accomplish

1 . 2 Location of Work:

1 . 2.1 Contractor's Shop

1 . 3 Identification:

1 . 3 . 1 Listed in 2 . 2 for Prefabrication o f Bow Ramp (Bow Ramp Approximately Size; 15 Inch H by 16 Feet and 11-1/2 Inch W by 17 Feet and 3-3/4 Inch L)

2 . REFERENCES :

2 . 1 Standar d Items (FY26)

2 . 2 169 - 5110389 Rev B, Bow Ramp Fabrication and Installation

2 . 3 ELM - 255189 , Naval Beach Unit Seven LCU-1651 , New Bow Ramp Fabrication ; Guidance for (Enclosed)

2.4 100 - 2889594 Rev F, Shell Expansion

2 . 5 108-28 89601 Rev A, Forecastle Deck Sid e Plating & Framing

2 . 6 114 -28 8 9610 Rev C, Transverse BHDS. FRS. 9 to 74

2.7 122-2889612 Rev F, Bow Ramp and Mechanical Details

2.8 160-5106612, INSTL of Bow Ramp Seal and Mounting Head Plate

3 . REQUIREMENTS:

3.1 Accomplish the requirements of 2.2 and 2.3 for prefabrication of B/A 327C bow ramp including each general note, using 2.4 through 2 . 8 for guidance.

3.1 .1 Fabrication is limited to the main structural shell, plating, framing, a n d permanent stiffeners.

3.1.2 Exclude the drilling of hinge pin holes and the final fit-up welding of components requiring templating from the existing hull (such as hinge pads, limit switch striker plates, seal retainers, and padeyes) from this prefabricat ion scope .

Shi /HULL NO. Shi /HULL NAME

TITLE:

Prefabrication of Bow Ramp; accomplish

JON:

ICN :

38NBA16905

Rev: Key Op:

A01

3 . 1.3 Accomplish the requ irements of 009 - 012 of 2.1, including Table 4, Column A, Lines One through 7 for welding. (See NOTE 4.3)

(V) "REPORT "

3.1.3.l Ensure to notify which welding standard has been selected to SUPERVISOR.

3.1 . 3.2 Accomplish nondestructive testi ng in accordance with Line 11, using Tl . of TEST NOTES of 2.2 for guidance .

3.2 Accomplish the requirements of 009 - 032 of 2.1 for cleaning and preservation of each new a nd d is t urbed surface to match surrounding area.

3 . 3 Deliver new prefabricated bow ramp including each excess material when SHIPSUPT notified where direc ted loca t ion during DSRA .

4. NOTE S :

4.1 Initial Condition - Project team requires the bow ramp will need to be prefabricated and ready to install s hortly afte r 7B1 DSRA start by t he other installation job .

4.2 SRF tool room will provide pressure gauge when required .

4.3 OPTION A) of Table 4 of 009-012 of 2 . 1 has been allowed to uti l ize under ELM-255171.

5 . GOVERNMENT FURNI SHED MATER I AL (GFM) :

5.1 See attached the Government Furnished Material List.

Shi /HULL NO. Shi /HULL NAME

LCU-1651 NBU-7

JON:

ICN:

38NBA16905

Rev: Key Op:

A01

TITLE:

Prefabrication of Bow Ramp; accomplish

MATERIAL LIST

QTY

ITEM PC REF STOCK HAZ DOC REQD/ PARA

NO. NO. NO. M/C DESCRIPTION NUMBER MAT NO. UNIT NO.

ELECTROD, WELDING ROD, 7018M, 3/32"DIA

9G 3439

001 M X 14"L, MIL-E-22200/10, P/N; 255014102,

SA4742861

N 5297E901 20/CN 3 1

1 0LB/CN, NO TEST IS REQUIRED

ELECTROD, WELDING ROD, 7018M, 1/8"DIA X

9G 3439

002 M 14"L, MIL-E-22200/10, P/N; 255014110,

SA4742863

N 5297E905 50/CN 3.1

10LB/CN, NO TEST IS REQUIRED

ELECTROD, WELDING ROD, 7018M, 5/32"DIA

9G 3439

003 M X 14"L, MIL-E-22200/10, PIN; 255014128,

SA4742865

N 5297E908 30/CN 3.1

10LB/CN, NO TEST IS REQUIRED

004 24 2.7 M

GREASE FITTING, 3/8"-18 NPT/ STRAIGHT, 9B 4730

N 5335E707 10/EA 3.1

STEEL, PIN H-400 SA2303016

005 57 2.7 M

BAR .METAL, ROUND BAR, BRONZE, 4.5" DIA 9B 9530 N 5258B053 1/FT 3.1

FOR THRUST WASHER 010302709

006 58 2.7 M

ROUND BAR, 2-3/4"OD, CRES 304/304L, 9B 9510

N 5336E705 3/FT 3.1

ASTM A276 , 3 FT REQUIRED, P/N 89535K73 SA2401478

007 C SHACKLE , 1-3/4 INCH, G-215, 1019070

9B 4030

N 5335E708 4/EA

SA2301337

008 2.3 M

304/304L SS ROD, MULTIPURPOSE 304/304L 9B 9510 N 5336E706 2/FT 3.1

STAINLESS STEEL ROD, 2" DIAMETER SA2202839

009 2.3 M

FLAT BAR, BRASS, 1/4" THK, 3" W X 12" L, 9B 9510

N 5336E707 1/EA 3.1

P/N 8954K102 SA2400488

010 2.3 M PIN .COTTER, CRES , 3/16" X 2",10 ENPG

9B 5315

N 5258B055 1/PG 3.1

016211371

011 M GREASE.UTILITY, GENERAL PURPOSE , MIL- 9B 9150 y 5339B831 1/CN 3.1

DTL-23549 009857316

GREASE.UTILITY, TERMALINE II. SEA

9B 9150

012 M WATER-WASH RESISTANT GREASE,

013069167 y 5339B841 1/CN 3.1

35LB/CN

013 2.8 M

ANGLE .STRUCTURAL, 1" X 1" X 1/8"THK, 9B 9520

N 5258B056 20/FT 3.1

ANGLE STEEL, ASTM A36 002775986

014 2.8 M

ANGLE .STRUCTURAL, 1" X 1" X 1/8"THK, 9B 9520 N 5258B057 20/FT 3.1

ANGLE STEEL, ASTM A36 002775986

015 2.8 M ANGLE .STRUCTURAL, 1" X 1" X 1/8"THK, 9B 9520 N 5258B058 20/FT 3.1

ANGLE STEEL, ASTM A36 002775986

016 2.8 M

ANGLE .STRUCTURAL, 1" X 1" X 1/8"THK. 9B 9520 N 5258B059 20/FT 3.1

ANGLE STEEL, ASTM A36 002775986

017 2.8 M

ANGLE.STRUCTURAL, 1" X 1" X 1/8"THK, 9B 9520

N 5258B060 20/FT 3.1

ANGLE STEEL, ASTM A36 002775986

018 C SWITCH.SENSITIVE, P/N : 6984H27A

3B 5930 N 5258B061 1/EA

002598810

019 C

STUFFING TUBE, NYST-2, SIZE 2. P/N: 9B 5975

N 5258B062 1/EA

M 19622/2-002 005034693

020 C

PACKING, PACKING ASSEMBLY, NYST-17, 9B 5330

N 5258B036 1/AY

SIZE 2E , P/N: M19622/17-0005 011082552 -

Ship/HULL NO. Ship/HULL NAME ICN: ' Rev: Key Op:

JON : 38NBA16905 A01

TITLE :

Prefabrication of Bow Ramp; accomplish

021 2.3 M

PLATE , METAL, 20.4 LB. 1/2" THK, ABS GR-A.

9B 9515 N 5339E502 1/EA 3.1

STEEL, 2 FT X 2 FT

022 2.3 M

PLATE .METAL, 30.6 LB. 3/4" THK, ABS GR-8.

98 9515 N 5339E503 1/EA 3.1

STEEL. 1 FT X 2 FT

023 C

PLATE , METAL. 1"THK (40.8LB) X 4FT X 8FT,

9B 9515 N 5339E504 1/PM .

ASTM A36

024 C

PLATE. METAL. 1-1/4"THK (51LB) X 1FT X

9B 9515 N 5339E505 1/EA .

2FT. ASTM A36/ ABS GRADE

025 52 2.7 M SQUARE BAR. 1 INCH SIZE, ASTM A36/A36M

9B 9515

N 5332E700 1/EA 3.1

SA2201957

PLATE .METAL, PLATE .METAL, 12.75 LB. 9B 9515

501 1 2.2 M 5/16"THK, STEEL, ASTM A36, 6 FT X 20 FT (3 SAMS0031 N 5317E506 3/PM 3. 1

PM REQUIRED) 2

PLATE.METAL, PLATE .METAL, 20.4 LB, 1/2"

9B 9515

502 2 2.2 M THK , ASTM A572, GRADE 50, STEEL, 5 FT X

SA2100640

N 5317E507 2/PM 3.1

15 FT (2 PM REQUIRED)

PLATE .METAL, PLATE , METAL, 25.5 LB, 5/8"

98 9515

503 3 2.2 M THK, ASTM A572 , GRADE 50 , STEEL, 1 FT X 2

SA2202659

N 5237E210 2/SF 3.1

FT REQU IRED.

PLATE .METAL, PLATE.METAL, 40 .8 LB, 1" 98 9515

504 4 2.2 M THK, ASTM A36, STEEL. 4 FT X 4 FT SAMS0100 N 5239E954 16/SF 3.1

REQUIRED. 0

PLATE .METAL, PLATE .METAL, 61 .2 LB. 1-1 /2"

9B 9515

505 5 2.2 M THK. ASTM A572, GRADE 50 , STEEL, 2 FT X 2

SA2302053

N 5237E211 4/SF 3.1

FT REQUIRED.

PLATE .METAL, PLATE .METAL, 81 .6 LB, 2"

98 9515

506 6 2.2 M THK, ASTM A36, STEEL, 1 FT X 2 FT

SA2202651

N 5237E212 2/SF 3.1

REQUIRED.

507 7 2.2 M

S-BEAM, S-BEAM , S15 X 42 .9 (0.41 " WEB X 98 9520

N 5317E508 165/F1 3.1

5.64" FLANGE), STEEL, ASTM A36 SA2201956

508 8 2.2 M C-CHANNEL. C-CHANNEL, C15 X 40 .00(0.52" 9B 9540

N 5317E500 53/FT 3.1

WEB X 3.52" FLANGE ), STEEL, ASTM A36 SA2201952

MC-CHANNEL, MC-CHANNEL, MC18 X 45.8

98 9540

509 9 2.2 M (0 .50" WEB X 4.0" FLANGE), STEEL, ASTM

SA2201953

N 5317E501 9/FT 3.1

A36

C-CHANNEL, C-CHANNEL, C15 X 50 .0 (0.72"

9B 9540 510 10 2.2 M WEB X 3.72" FLANGE ), ASTM A572 , GRADE

SA2201954

N 5317E502 18/FT 3.1

50, STEEL

511 11 2.2 M

BAR.METAL, BAR.FLAT, 4" X 1/2" THK, 9B 9510

N 5232B029 12/FT 3.1 STEEL, ASTM A36 001891620

512 12 2.2 M

FLAT BAR , FLAT BAR. 7" X 1/2" THK , STEEL, 9B 9530

N 5330E722 19/FT 3.1

ASTM A36 SA2201955

513 13 2.2 M

PIPE .SCH ED 80 , PIPE , 6" NPS (SCHED 80), 9B 4710

N 5330E723 22/FT 3.1

STEEL, ASTM A53 SA2201959

514 14 2.2 M

PIPE, SCHED 80 , PIPE , 10" NPS (SCHED 80), 9B 4710

N 5330E724 2/FT 3. 1

STEEL, ASTM A53 SA2201960

515 15 2.2 M

ANGLE .ST, ANGLE , 3" X 3" X 3/8" , STEEL, 9B 9520

N 5231B015 18/FT 3.1

ASTM A36 002774948

516 16 2.2 M

SQUARE BAR, SQUARE BAR, 1" X 1" X 8FT X 9B 9510

N 5317E503 50/EA 3.1

50 EA REQUIRED , STEEL, ASTM A36 SA2201957

Ship/HULL NO. I Ship/HULL NAME · ICN:

38NBA16905 LCU-1651 I NBU-7 JON:

TITLE :

Prefabrication of Bow Ramp; accomplish

517 17 2.2 M

ROUND BAR, ROUND BAR, 2-7/8" OD, CRES 9B 9510

N 316, ASTM A276 SA2202647

518 18 2.2 M

BOLT ,HEX HD, BOL T,HEX HD, 3/8"-16 UNC-2A 9B 5305

N X 3" LONG, CRES 316, ASTM F593 SA2202666

NUT,HEX,SLF-LKG, NUT.HEX, SELF-

9B 5310 519 19 2.2 M LOCKING, 3/8"-16 UNC-3B, NYLON-INSERT,

SA2202667

N

CRES 316, ASTM F594

520 20 2.2 M

WASHER FLAT, WASHER FLAT, 3/8" 9B 5310

N

NOMINAL. CRES 316, B18.22.1 SA2402007

THRUST WASHER, THRUST WASHER, 2" X 4"

9B 5310

521 21 2.2 M NOMINAL, 1/4 " THK, BRONZE (OILITE PLUS

SA2202825

N

/3.98" 00), P/N TP-4002

BUMPER.WING TYPE, BUMPER.WING TYPE,

522 22 2.2 M

O-BORE , CODE NO. DB-405, EPDM. 400 9B 5340

N

SERIES, WIDTH=S". THICKNESS(BT)=1 /2" , SA2301112

OUTSIDE DIAM(D)=2-1/2",BORE DIAM=1"

523 23 2.2 M FLAT BAR, FLAT BAR, 5" X 1/2" THK, STEEL, 9B 9510

N

ASTM A36 SA2302052

PLATE.METAL, PLATE .METAL, 30.6# ,

9B 9515 524 24 2.2 M 3/4"THK, ASTM A572, GRADE 50, STEEL, 2 FT

SA2202660

N

X 2 FT REQUIRED.

525 11 2.2 M

BAR.METAL, BAR,FLAT, 4" X 1/2" THK, 9B 9510

N STEEL, ASTM A36 001891620

Rev: Key Op:

A01

5240E953 2/FT 3.1

5233E704 10/EA 3.1

5233E705 10/EA 3.1

5232E704 20/EA 3.1

5232E705 20/EA 3.1

5232E706 60/FT 3.1

5339E705 60/FT 3.1

5339E506 4/SF 3.1

5231B008 30/FT 3.1

6/2-2-

CUI/ /S P-CTI/FEDCON

Cuntrollcd b) DO ENGINEERING LIAISON MEMORANDUM Co11trollcd b) SRF-.I RMC/S245 l'll l Catcgorv CTI D1stribut1011 Siatcinent 01 I.DC C POC C II ad not / 3 I )-252-83 17

Slff-J H~IC DET. SASEBO p)J\1 HIHI 1r11)N 'il ~JI MJ'"lT <. ll1,1nh11,,,i1 •111l11•111~J1n II\ <,,,,cnunc1,1

'11'-ll,. 5< .\UJ tho.II ,,'11lla..l.11, (11t1,.,1I J L' IJ1oul1•~• '<i'I 2<1:~ l I '1/)1. 1 [ I , tqm ,h t.,11/u, .lo,um,111 d1~II I, u1<'11.:Jh• I', Kl\ 11 ,1111• It, p,m J ...,1l1tl m,I IJl'On ~ ... p1on.il M.11111L11,,ntl' (.f11r11 Y,,I,.,, .11. • 1,r,iu

I. ll llLL j';Q , / S11111 NAMf: / TITL•: ~- 1:1.M NO. l,l . REV II, ICNIKO '5, [ SR NO.

255 189 I - I 38NBA 16903-A0 I ILCU5 1-0l 14 Naval Beach Un it SEVEN ••.SCD IJ. DFS REQ UIRED

LCU- 165 1

BOATA LT: 327C DFS: NIA

New Bow Ramp Fabrication: Guidance fo r ~.SWIJS I). ADDITIO,, AL APl'UCAU ILIT \ ':

169 I NIA

10. APPROVAL

01ia:i1uuor Dalt' , :-r Ht\'itwtr Daer

Y. IIDA 09/08/2025 A. CA MPBELL CAMPBELL ANOR[W ~-ic.~~r .. ,, • , '"' TAtBOl 1'6300 1111 ~•;_.,;,.,.,."' ' '".,. 911 09/08/2025

Projt<'I Support F.n t inr~r

E. AKUNA

~24S llrsign Branch I lt'ad

AKUNA EVAN.tSA =~~\:;_., ,.._._ ..

AC 1534633609 r.- :<':'I.,. .... ,,..,_""

C'. R. HADNOT

11. CORRECTIVE ACTION

I. REFERENCE:

09/08/2025 U:llt'

09/08/2025

(a) NA VSEA DWG 169-5110389 Rev B. BOATALT 327C. I 35FT La nding Craft Utility (LCU).

Bow Ramp Fabrication and Install ation

(b) ELM 235 123 Rev B. LCU-1666. New Bow Ramp Fabrication; Guidance ror

(c) ELM 24504 1 Rev A. LCU- 1631 and 1634. New Bow Ramp Fabrication; Guidance for

(d) NA VS EA DWG 122-2889612 Rev F. I ,CU 1646 Class. Bow Ramp and Mechanical Detail s

(e) NAVSEA DWG 160-5106612 Rev-. BoatAlt LCU/228C. l.CU 1646 Class. Inst! ol'Bow Ramp

Sea l and Mounting Head Plate (() NA VS EA DWG 122-5500750 Rev -. Bow Ramp Sec uring Padeyes

(g) Design Test Memorandum 611 -50725 Rev-. Padeyes Bow Ramp Securing Sta tic Load Test

2. ENC LOSURE:

( I) LAR No. 135 LC lJ-2507 lSRF Sasebo LA R No . BA3 27C/LCU l666/401], Fi nal in stalled dimensions. administrati ve error and les ons' lea rn s to be updated in BoatA lt drawing. dated 24 Feb 2025

(2) LAR No. 135LCU-2409 ISRF Sasebo I.AR No. REPAIR/LC Ul631/383]. Bow Ramp Wate11 ight Sea l, dated 16 Mar 2024

3. BACKG RO UN D:

a. SRF Sasebo wa ta. ked to upgrade a bow ramp on I.CU 165 1 in accordance with Boat Altera tion

327C. rererence (a). and repl ace all bow ramp sea ls with new. This is the 4th cra ft planned to receive the bow upgrade in SRF-JR MC Detachment Sasebo. I.CU 1666 and 163 1 have acco mpli shed the altera tion. LCU 1634 was planned in 2025. However, it was dererred due to the delay of material acquirement. Lessons learned have been noted in references (b) and (c) and LARs including enclosure ( I ).

b. ESR LC lJ 5 I-0 11 4 requ ested SRF Sa ebo Design Branch Code S245 to provide the requirement customi zed to LC U 165 1 other than refere nce (a).

ELM 255 189

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4. GENERAL NOTES:

a. The purpose of thi s ELM is to prov ide guidance for the fabrication and test ing of th e ne,v bow ramp in accordance with reference (a).

b. A two (2) inch clearance shown in Det 31 -F (Zone 30-H) in reference (a) shall be maintained for proper seating of the ramp sea l when the ramp i closed. A minor dimensional adjustm ent is all owed to make the clearance.

c. All dimensions at th e interfaces with LCLJ craft hull , including th e lifting pocket padeyes. shall be inspected prior to the com mencement of the new bow ramp fabrication .

d. All genera l and test notes in references (a) apply unl ess otherwi se pecitied.

5. REQU IR ED ACTIONS:

a. Accompli sh the bow ram p alterati on in accordance with reference (a) and the following:

b. When the ex isting bow ramp is removed from the cra ft , measure th e distances and dimensions li sted below and notify SRF of them via CFR. Annotate any differences from referen ces (a), (d) or (e).

except (2) below. and a rccomrncndcd dimension for the new bow ramp to be sa ti sfied with General Note (b) as necessary . NBU7 Project Team shall requ est Des ign Branch Code S245 to eva luate the measurements and recommendation via ES R.

( I). Di tance from an upper face or the bow ramp sk in plating to a center or hinge hole of the existing bow ramp.

• It is shown as 7-1/2 inches on Elev T-5· ' OFF CL (Zone 4-A) of refe rence (d). Per refe rence

(a). the same di stance of new bow ramp is 8-11 / I 6 ... calculated as 8-3/8 inches plus 5/ 16 inches. which are shown on Sect 38-G (Zone 40-G) of reference (a) and the ramp sk in pl ating thickness I Item I of reference (a)l . respecti ve ly.

(2). Distance from the upper head plate (Item 6 in Det 15-B and Det 15-E or reference (e)] to a center of the hinge hole of hull hinge pads. No designed distance is shown in references.

(3) . Distance between the center of existing Port/ tbd lifting pocket padeyes on the ex i ting bow ramp and centerline.

(4) . Locati on of ex isti ng Port/S tbd bow ramp securing T-bolts.

(5). Dimensions of' ex isting Port/Stbd padeyes and thei r locations on the ex isti ng bow ramp

c. Install two (2) bow ramp securing padeyes on new bow ramp per reference (I).

d. If the existing ramp sea l is replaced per Tt::ST NOTE T2.5.5 in reference (a). fab ricate and install new gasket I Item 22 in reference (a)I in acco rda nce wit h reference (e} and the addi tio nal guidance bel ow per enc losu re (2) .

( I). Cutting of the sea l shal l be accomplished usi ng a band saw or a hydra ulic guil lotine type cutt er vice hand too ls.

(2) . Use Loctite 42 11 adhesi,·e I Para 7. Item bJ to glue the sc:a ls together.

ELM 255189

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(3) . Clean al l mating su rfaces with alcohol before app lying the Loctit e adhesive.

(4). A co rner clamp or jig shou ld be used to hold the ends ol' the sea ls together until the ad hesive cures.

(5). Lei the Loctite ad hes ive cure fo r 24 hours before removing the sea ls from th e jig.

6. TEST NOTES:

a. TEST NOTE T2 .3. IO in reference (a) shoul d read as fo ll ows:

"Inspect hinge padeve welds in accordance ll'ith General Note 15. Table 2. Lines 7 and JO.

Column A ...

b. Perform a static load lest for the install ed bo\\ ramp securi ng padeyes in accordance with refe rence (g).

7. MATERI ALS:

a. See references (a) and (().

b. Ad hes ive. Loctite 42 1 I. Qty: As required

ELM 255189

CUI//SP-CTI/FEDCON

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I c,., '><:i::1on - - ·-·------- <e) Enclosure (1) LIAISON ACTION RECORD

I - -· ..

CUI

Fro~wiet 1 of 11 To: Priority:

U.S. Naval SRF-JRMC Detachment Sasebo, Japan Naval Surface Warfare Center Carderock 0 No Response Needed

Engineering and Planning Division Division Det Norfolk D Emergent (24 Hours)

Design Branch Code S245 2600 Tarawa Court, Suite 303

□ Urgent (3 Working Days)

Virginia Beach, VA. 23459-3239 PSC 476 Box 16, FPO, AP 96322 Attention: □ Routine (20 working days)

CRDR_LC_NAVY _BOATS_I SEA@us.navy.mi l Date Needed By

Date: 2/20/2025 lu1c: 62758 LAR No. 135LCU-2507 Originator No. BA327C/ LCU1 666/401

Originator

Name: Phone:

I Email :

Yoshizumi IIDA +81-80- 1794-5536 Yoshizumi.11da. ln@us.navy. mil

Planner: N/A Reference (BOATALT/JCN/DFS/OTHER): BOATALT 327C

Submitting Authority Signature: 'lj&fiv1.umi J J'J)a Date : 2/20/2025

Subject/Title: Final installed dimensions, administrative error and lessons· learns to be updated 1n BoatAlt drawing

Priority Justification:

Notification purpose only.

Request/Problem: I Boat Type: 135 FT LCU-1627 CLASS Hull No. : LCU 1631 and 1666

SRF Sasebo accomplished Boat Alteration 327C on LCU 1666 and 1631 using Ref (1) thru (6). The Boat Alt for LCU 1666 and 1631 were executed in 2023 and

2024 docking avai labilities, respectively. Then, on 2024 winter, SRF received an updated BoatAlt drawing Ref (7) involving Ref (2) thru (6). This LAR notifies

Planning Yard of final dimensions, an administrative error and lesson's learns to be updated in the BoatAlt drawing Ref (7). The details are as follows: T""

I I.() O> <D T""

Att. / Ref : 1. NAVSEA DWG 169-5110389 Rev A, 135 FT Landing Cra~ Uti lity (LCU), Bow ramp Fabrication and Installation (BA 327() co z

2. LAR 135LCU-2316 [BA327C/LCU1666/346), Dimensional adjustment for Bow Ramp Hinge plates and Missing plate material specification co

Reply/ Resolution:

1. Updates for the install of BA 327C on LCU 1631 and 1666 are greatly appreciated. NSWCCD wi ll include these changes in the next drawi ng revision.

Any changes in this Liaison Acllon Reco1·d (LAR) shall be addressed by LAR in accordance with the Engineering and Technica l Authority Process 3.2.5. The LAR shall be addressed as follows:

Naval Surface Warfare Center

Carderock Division, Detachment Norfolk

2600 Tarawa Court, Suite 303

Virginia Beach, VA 23459-3239

Att,/Ref:

Technical POC: David A, Campbell Approved By (Branch Head): Michael M. Fetsch Code: 8323

Phone: 757-287-1432 Signature n1 al) ~~ FETSrn.MICIIACL.M.125~777952 Date: 2/24/2025 Email : dav1d.a.campbell.civ@us.navy.mil ,' 2025.02.]4 17:03: I B -05 00

DISTRJBUTION STATEMENT D: DISTRIBUTION AUTHORJZED TO DEPARTMENT OF DEFENSE AND U.S. DOD CONTRACTORS ONLY; ADMINISTRATIVE OR OPERATIONAL USE (2025). OTHER REQUESTS SHALL BE REFERRED TO DIRECTOR, NAVAL SURFACE WARFARE CENTER, CARDEROCK DIVISION, DETACHMENT

NORFOLK. Page of 2 / 0L_ NSWCCDN Form (03/ 22) C LJ I / ZZ

ELM 255189

Enclosure (1) Sheet 2 of 11

Continuation:

Att/Ref (cont'd):

I""' I II

LIAISON ACTION RECORD

3. LAR 135LCU-2318 [ BA327C/LCU1666/347), Welding requirement to fabricate new Bow Ramp

LAR No:

DATE:

CODE:

PAGE: 2

135LCU-2507

2/20/2025 of 2

4. LAR 135LCU-2328 [BA327C/LCU1666/362), B/ A 327C Bow Ramp Replacement Weld Guidance, other than listed in LAR BA327C/LCU1666/347

5. LAR 135LCU-2327 [BA327C/LCU1666/361), B/ A 327C Bow Ramp Replacement Weld Guidance

6. LAR 135LCU-2317, Bow Ramp Static Load Test

7. NAVSEA DWG 169-5110389 Rev B, 135 FT Landing Craft Util ity (LCU), Bow ramp Fabrication and Installation (BA 327C) (As Att. 1)

8. NAVSEA DWG 122-2139878 Rev B, LCU 1610 Class, Bow Ramp and Mechanical Details (LCU 1631 thru 1636)

9. NAVSEA DWG 122-2139876 Rev D, LCU 1610 Class, Bow Ramp and Mechanica l Details

10. NAV5EA DWG 122-288961 2 Rev F, LCU 1646 Class, Bow Ramp and Mechanical Details

Request/Problem (cont'd):

1. For 1666 only. Regarding the STBD lifting pocket on Det 50-A in Ref (7), a padeye plate [Item SJ was insta lled with 1-1/8" STBD offset from the designed dimension shown as 4-3/ 8'' on Zone 49-D. Recommend to add a note for the dimension as 5-1/2" for LCU 1666 STBD lifting pocket. The change was made to resolve an issue that a shackle [Item R2) interfered with the hull structure when the bow ramp was closed,

2. For 1631 only. Sect 67-A and Det 67-C in Ref (7) applied to LCU 1631. Recommend to add LCU 1631 m the applicability notes.

3. For 1631 and 1666. Regarding the hinge pad on Sect 67-A (Zone 70-A) in Ref (7), a dimension for the hinge hole center was made as 7-1/8" vice 7-1/ 2" in accordance with Request and Reply 1 1n Ref (2). Recommend to update the dimension on Sect 67-A (Zone 70-A) in Ref (7).

4. Regarding Test Note T2.3.10 in Ref (7), recommend to change the material to be inspected from "UmNG POCKET" to "HINGE PADEYE".

5. For 1631 only. The following issues were found during execution of the BoatAlt :

(a). The existing bow ramp structure conformed to Ref (8) vice Ref (9) listed as reference 7 in Ref (1). The existing had nine (9) hinges, which were arranged with the equal space, to connect to the craft hull structure, vice ten (10) hinges shown in Ref (9). Therefore, new bow ramp designed with ten l1inges per Ref (1) was unable lo be installed. The actions below were accomplished to install the new bow ramp.

,. The existing hull hinge pads, except the outboard most port and starboard pairs, were removed.

ii. (16) new hull hinge pads, l " thickness OSS, were fabricated and installed using double bevel-groove weld with 3/8" reinforcing fill et weld.

iii . 2-3/4" LG square bar, 1" x l " OSS, was installed on one side of the hinge pad with 3/ 16" fi llet weld. Eight pairs of hull hinge pads were made.

iv. One ramp hinge pin, CRES 304, was fabricated.

v, All welding were inspected by VT in accordance with MJL-STD-1689A.

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(b). The existing port and starboard bow ramp chains were connected to the existing bow ramp using a common link conforming to Sect 9-C 1n Ref (8), vice shackle per Item R2 in Ref (1). Add itionally, as existing condition one 1-1/ 2" detachable link was used to connect common link to the port and starboard chains. The existing detachable link was unable to fit to the procured 1-1/2" shackle mentioned in sub-paragraph i below. The actions below were accomplished to install chain to new bow ramp.

i. Two new 1-1/2" shackles [Crosby PN G-215) were procured and installed as shown on Elev 6-A in Ref (10).

ii. Two new 1-5/8" detachable links were procured and installed between the shackle and chain at port and starboard. The size is specified on Item 16 in Ref (9). As a note, ship check on LCU 1666 revea led the existing detachable link size was 1-5/8".

iii. A common link was removed from the end of the chain connecting to the detachable link in order to attain the proper orientation of the chains.

Removal of the common link reduced the length of the port and starboard ramp chain by approximately 6".

6. The above paragraphs 1 thru 4 are shown as the redlines in Attachment ( 1 ).

Please send LAR reply to Mark.Shores@srf.navy.mil (Controlled/Technology Data Specialist) and TechDocs@srf.navy.m1l for uses review prior to release to

Japanese MLC workforce. Please Cc lo chnstopl1er.r.hadnot.civ@us.navy.mil (Code S245 Branch Head) and daniel.t.malsuo.civ@us.navy.mil (Project Support

Engineer).

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