Printed from https://fiscalreceipts.com/program/2150/ — data as of July 28, 2026. Every figure is citation-backed; see the page online for per-number provenance.
SSN Acoustic Equipment
Budget Figures
FY2026 award data is a partial year — USASpending awards are reported on a rolling basis and the fiscal year does not close until September 30. why partial FY2026 data? →
- FY24
- $519.3M
- FY26
- $498.6M
● actuals (line) · ○ enacted · ◇ request — gaps are editions the program is absent from, never interpolated.
| Series | FY22 | FY23 | FY24 | FY25 | FY26 |
|---|---|---|---|---|---|
| Actuals | $379.5M | $446.6M | $519.3M | ||
| Enacted | – | $446.7M | $463.6M | $465.8M | |
| Request | – | – | $463.6M | $502.1M | $498.6M |
blank = series not published for this year; – = absent from that edition.
Asked vs spent: the PB2024 book requested $463.6M for FY2024; the PB2026 book reports $519.3M actually spent — $55.7M above the request.
Program Lineage
No predecessor/successor lineage was recorded for this program element — no FY-to-FY transfer into or out of this line was stated in the ingested J-books, and none was inferred from the program structure.
Description
Description — SSN Acoustic Equipment
MISSION DESCRIPTION AND BUDGET ITEM JUSTIFICATION: This program procures submarine systems and equipment for installation on all classes of submarines to maintain clear acoustical, tactical, and operational superiority over submarine and surface combatants in all scenarios through detection, classification, localization, and contact following. All future acoustic upgrades of Acoustic Rapid COTS Insertion (A-RCI) equipment are incorporated into this budget item. Future procurements, detailed below, are focused on supporting Littoral Warfare, Regional Sea Denial, Strike Group Support, Diesel Submarine Detection, Surveillance, and Peacetime Engagement. A-RCI is a multi-phased, evolutionary development effort geared toward addressing acoustic superiority issues through the rapid introduction of interim products applicable to SSN 688, 688I Flight, SSN21, SSGN, VIRGINIA Class, and OHIO Class Submarines. A-RCI Phase II provided towed array processing improvements; A-RCI Phase III provides spherical array processing improvements, and A-RCI Phase IV provides AN/BSY-1 High Frequency Upgrades for SSN 688I, SSGN, and SEAWOLF Classes. As part of Navy's plan to maintain acoustic superiority for in-service submarines, reduce obsolescence, and provide increased capability, the A-RCI program will modernize and sustain approximately 8-12 SSNs and 2-3 SSBNs per year through executing bi-annual software Advanced Processing Builds (APBs) and bi-annual hardware Technical Insertions (TIs). A-RCI annual funding varies based on the number of modernizations funded as well as the particular class of submarine being modernized. Towed System procurements of TB-29C and TB-34A provide reliability improvements to maintain Acoustic Superiority, increase the service life, reduce failures, and maintain the inventory of arrays available for fleet use. Towed Array Refurbishment & Reliability Upgrades sustain current in-service TB-16/34 Fatline and TB-23/29A Thinline towed arrays. Towed System procurements provide upgrade/support for OK-276, OK-634, OK-542 and OA-9070 Series Towed Array Handlers installed on SSN688, SSN 688I, SSN21, SSGN, VIRGINIA Class, and OHIO Class Submarines. Procurement of Low Cost Conformal Array (LCCA) provides enhanced situational awareness and collision avoidance capability in high contact density environments experienced in the littorals. Procurement of VA Unique Sensors sustains unique hull sensor systems for the VA platforms under the Critical Transducer Program as VIRGINIA Class submarines transition into fleet service. Procurement of the OHIO Class Large Vertical Array (LVA) provides improved detection and enhanced tactical situational awareness capability for tracking targets of interest and supports acoustic superiority objectives for the OHIO class submarines. SSBN systems will be approximately half the width of their SSN counterparts. This variance reflects the difference in mission, expected environment, and requirements. Procurement of the VIRGINIA Class Large Vertical Array (LVA) and installation provides improved detection and enhanced tactical situational awareness capability for tracking targets of interest and supports acoustic superiority objectives for the VIRGINIA class submarines. SSN systems will be approximately twice the width of their SSBN counterparts. This variance reflects the difference in mission, expected environment, and requirements. Procurement of the High Frequency Sail Array (HFSA) provides high frequency active and passive capability supporting ASW and ASUW for SSNs, and contact avoidance for SSNs and SSBNs. This capability enables close in situational awareness with high bearing accuracy. HFSA improves situational awareness and tactical control in high -density contact areas, of particular importance for Pacific Fleet SSBNs based at Bangor, WA inside the Puget Sound with three major commercial shipping ports as well as the Atlantic Fleet SSBNs based at Kings Bay, GA as increased global shipping density has increased the risk posed to SSBNs from merchant traffic. Procurement of hydrophones, transducers, cables, associated Out-Board Electronics bottles (OBE), and acoustic windows for In-Service Undersea Warfare Sonars on all classes of submarines are required to support units in the fleet on a replacement basis, at regularly scheduled ship overhauls, and at interim availabilities when units are defective, and for upgrades. Procurement of Light Weight Wide Aperture Array (LWWAA) Unit 6512 receiver hardware for technology refresh for Software and Hardware updates to accommodate shifts in technology to counter obsolescence on Block I/II VIRGINIA Class submarines. The LWWAA on Block I/II VIRGINIA Class submarines will no longer be operable without this technology refresh. Installation funds are for actual hardware installations during shipyard and pier-side availabilities. Procurements support a 18-24 month lead-time for installations. [P40A / SA102 TOWED SYSTEMS]: Procures TB-34A Fatline and TB-29C Thinline Arrays to provide increased acoustic capability and reliability to the fleet. The program supports refurbishment/upgrades and reliability improvements to TB-16 series, TB-23, TB-29A to maintain in-service Towed Array inventory and increased array availability. Reliability improvements include new telemetry, hose material, improved internal connectors, hydrophones, tow cables, Vibration Isolation Modules (VIMS), and Heading Sensors. [P40A / SA105 SONAR SUPPORT EQUIPMENT]: Funds provided to procure BQN-17(A) and associated equipment. [P40A / SA106 HULL SENSORS]: Procurement of Low Cost Conformal Array (LCCA), which provides enhanced situational awareness and collision avoidance capability, Large Vertical Array (LVA), which provides improved detection and enhanced tactical situational awareness capability, and VA Unique Sensors required to sustain unique hull sensor systems for the VA platforms under the Critical Transducer Program. [P40A / SA201 BLOCK CHANGES]: Minor Engineering Change Proposals (ECP's) and hardware changes affecting all classes of submarines are procured through this line. Funding will be used to support non-recurring first article test efforts associated with the changing COTS environment as well as Reliability, Maintainability, and Availability modifications requested by the Fleet. This line also supports the procurement of hardware necessary to implement the ECP's into the System or end item being procured. [P40A / SA202 PRODUCTION/ENGINEERING SUPPORT]: Funding supports the procurement of Acoustic Upgrades equipment, Towed Systems hardware, Large Vertical Array in-board processing equipment, Large Vertical Array shipyard installation support & support equipment, and Low Cost Conformal Array engineering and production to support the reduced weight variant. [P40A / SA203 TOWED ARRAY UNIQUE TEST EQUIPMENT]: Funding procures various Towed Array test equipment simulators and handling system/stowage tube inspection test equipment. [P40A / SA302 OP TRAINER UPGRADES]: Funding procures hardware upgrades and production engineering for Acoustic Upgrades operational trainer sites. [P40A / SA303 COTS SUPPORTABILITY UPGRADES]: Provides for Technology Refresh/Insertion for A-RCI kits. Tech Refresh provides for Software and Hardware updates to accommodate shifts in technology to the execution procurement years' "current state-of-the-practice" hardware. A-RCI has already undergone several technology insertion phases to accommodate integrating Advanced Processing Builds (APBs). Updates are necessary for signal and display processing hardware as APBs are introduced or as commercial support for the hardware is phased out. Tech Insertion procures the hardware necessary to upgrade and back fit the A-RCI kits. When A-RCI systems are being upgraded to subsequent phases of A-RCI, signal processing and display hardware will be procured from this line to accommodate common technology consistent with the APB being implemented in the year of introduction. In future years, requirements include additional equipment in technology insertion to prevent COTS hardware from becoming unsupportable/obsolete. Funding also supports the procurement and engineering for COTS Underwater Comms and the CYBER Reliability Support. [P40A / SA401 INITIAL TRAINING]: Provides for initial training curriculum development, training management materials, exercise control group development, pilot services, and services to the Fleet. [P40A / SA900 CONSULTING SERVICES]: Includes specification validation, contract deliverable monitoring, prime contractor monitoring for cost, schedule, and performance slips, ILS planning, and coordination of GFI. Additional support will include production planning, business case analysis, technical refresh and insertion planning and market analysis to review implementation strategies for procurement of current year "state of the practice" hardware in Acoustics programs. Consulting services will also provide production monitoring, installation planning and coordination support. [P40A - 2 / PU100 SONAR, SWITCHES, AND TRANSDUCERS]: Included in this line are procurements of transducers, hydrophones, windows, cables, domes, accelerometers, Out-Board Electronics (OBE), domes and their associated mounting hardware, and other support equipment and materials for the following Undersea Warfare Sonars: BSY-1, BSY-2, BQQ-5, BQQ-6, BQQ-10, BQG-5, BQS-15, BQS-14A, WQC-2, WLR-9/12, BQN-13, BQN-17, BQA-8, BQH-1 and BQS-25. In-Service Enginering Agent (ISEA) and Technical Design Agent (TDA) support for these procurements is also included in this line. [P40A - 2 / CABLES]: Procures sonar cables to support Fleet usage requirements to maintain submarines in an operational status, adjustments are made to product types and quantities. Items not procured in a single year do not impact the production line. [P40A - 2 / SENSORS AND ARRAYS]: Procures sonar sensors, arrays, and transducers to support Fleet usage requirements to maintain submarines in an operational status, adjustments are made to product types and quantities. Items not procured in a single year do not impact the production line. [P40A - 2 / DOMES AND WINDOWS]: Procures sonar domes and windows to support Fleet usage requirements to maintain submarines in an operational status, adjustments are made to product types and quantities. Items not procured in a single year do not impact the production line. [P40A - 2 / PU200 ENGINEERING CHANGES]: Funds ECPs, Value Engineering awards, and hardware changes affecting the SSN 688, 688I, SEAWOLF, SSBN 726 (TRIDENT), SSGN/SSBN, and VA Class submarines. [P40A - 2 / ENGINEERING CHANGES]: Supports engineering changes to maintain submarines in an operational status. [P40A - 2 / PU300 PROGRAM SUPPORT]: Supports the procurement of equipment of sonar hydrophones, transducers, cables, Out-Board Electronics (OBEs), and acoustic windows for In-Service Undersea Warfare Sonars. [P40A - 2 / PROGRAM SUPPORT]: Supports procurement of equipment of sonar hydrophones, transducers, cables, Out-Board Electronics (OBEs), and acoustic windows and domes for In-Service Undersea Warfare Sonars. [P3A / SA101 LWWAA TECH REFRESH]: Funding supports procurement of Light Weight Wide Aperature Array (LWWAA) Unit 6512 receiver hardware for technology refresh for Software and Hardware updates to accommodate shifts in technology to counter obsolescence on Block I/II VIRGINIA Class submarines. [P3A - 2 / SA101 SSBN LEGACY INTERFACE HARDWARE]: Procurement of hardware to accommodate increased power requirements of SSBN modernization equipment.
Justification
Justification — SSN Acoustic Equipment
FY26 funding provides the following procurement requirements in support of submarine modernizations: Acoustic Rapid COTS Insertion (A-RCI) equipment VA Mod (Blk I/II and Blk III/IV) (4), and (2) SSBN Ohio Class, and SSBN Columbia Class (1); TB-34A Fatline (5) and TB-29C Thinline (4) Towed Arrays; Towed Array refurbishment & reliability upgrades to sustain current in-service TB-16/34 Fatline and TB-23/29A Thinline arrays; OK-276, OK-634, OK-542, and OA-9070 Series Towed Array Handlers; HFSA (1) for SSBN, LCCA (2 SSN); and various hull sensors, transducers, and associated equipment for all classes of In-Service submarines. The FY 2026 request was reduced by $.567 million for Advisory and Assistance Services to promote efficiencies and advance the policies of the Administration in alignment with Executive Order 14222, "Implementing the President's Department of Government Efficiency Cost Efficiency Initiative." Overall increase from FY25 to FY26 of $32.7M is driven by Submarine Industrial Base (SIB) investment in several critical efforts to further address Sonar sustainment. These efforts include increased support for LOS ANGELES (LA) Sphere Interface Unit (SIU) Tech Refresh, update In-Service VACL Chin Array modules to a newer, more capable network interface, replacement of obsolete technology, and addresses several EOL components. VACL BLK I-IV TSMS Reliability Telemetry Backfit, LACL and SEAWOLF TSMS TAIPT Telemetry Obsolescence Refresh, and LA & VACL BLK I/II Spherical Array Legacy Transmit Group Tech Refresh efforts were also increased starting in FY25.
Budget Line Items(workbook-cited)
Exhibit P-1
| Account | Org | Type | Amount |
|---|---|---|---|
| Other Procurement, Navy | N | FY24 Actuals | $519.3M |
| Other Procurement, Navy | N | FY25 Enacted | $465.8M |
| Other Procurement, Navy | N | FY26 Disc. Request | $498.6M |
| Other Procurement, Navy | N | FY26 Total | $498.6M |
Budget Details(R-2/P-40 facts)
| Project | All Prior Years | FY24 Actuals | FY25 Total | FY26 Base | FY26 Request |
|---|---|---|---|---|---|
| Program Element | $2.48B | $519.3M | $465.8M | $498.6M | $498.6M |
No follow-the-dollar view — this program's awards haven't been crosswalked at high confidence (flows cover 17 of 1741 programs). why coverage is partial? →
Awards
No awards are linked to this program element at high confidence — the budget→award crosswalk only asserts links it can defend, and this line has none yet.
Lobbying Mentions
No Senate LDA lobbying filing in the tracked data mentions this program element by code or alias.
No research dossier for this program — dossiers cover 50 of 1741 programs, the largest fully J-book-detailed lines by FY2026 requested dollars. why no dossier here? →