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Mk 48: Before and After
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The Mk-48 is the standard heavyweight torpedo used by the US military, and is mounted primarily on submarines. Surface ships use the smaller Mk46 or Mk50. The Mk-54, in contrast, stemmed from the need for a smaller, lighter, and cost effective advanced torpedo – one that could be dropped from helicopters, planes, and smaller ships. In recent years, the US has moved to modernize and maintain its Mk-48 inventory; the Mk-54 also requires servicing and spares.

These contracts are being issued under a total enterprise partnership between Raytheon and the US Navy called Team Torpedo, dedicated to meeting the needs of U.S. and allied naval fleets. Team Torpedo combines Raytheon’s manufacturing, design engineering, and support services expertise with the systems engineering and testing capabilities of Naval Undersea Warfare Center (NUWC) operations in Newport, RI, and Keyport, WA. Total announced awards under that consolidated torpedo contract since its announcement on June 22, 2004 have now risen to $261.9 million, issued on behalf of the US and Royal Australian navies.

DID has the complete set of contracts below… plus more details regarding the torpedos involved, and the answer to the question “what the heck is CBASS standard”?

• Heavyweight & Flyweight: Mk-48 ADCAP and Mk-54
• Team Torpedo Contracts & Key Events
• Additional Readings

Heavyweight & Flyweight: Mk-48 ADCAP and Mk-54

US torpedos
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The Mk-48 is a huge 533mm torpedo (19 feet long, 3,500+ pounds) with advanced homing, wire guidance capabilities, and devastating consequences when its 300kg warhead hits a target. It is designed to kill both fast, deep-diving nuclear submarines and high performance surface ships, and is carried by US Navy and Royal Australian Navy submarines. The Mk 48 ADCAP has improved target acquisition range, reduced vulnerability to enemy countermeasures, reduced shipboard constraints such as warm-up and reactivation time, and enhanced effectiveness against surface ships. These torpedoes can operate with or without wire guidance, and can use active and/or passive homing, conducting multiple re-attacks if they miss the target. Cost estimates for this weapon are around $2 million each, rising to almost $3 million in some cases with upgrades factored in.

The Common Broadband Advanced Sonar System (CBASS) kit is for the Mk48, and includes a Broadband Sonar Analog Receiver, preamplifier and interfacing hardware. This gives the retrofitted torpedoes the ability to transmit and receive over a wide frequency band, and takes advantage of broadband signal processing techniques to improve their targeting & tracking capabilities. This is especially helpful in shallower waters, where the bottom and other clutter is more likely to be in the way. The CBASS kits procured in before the end of FY 2007 are for Mk-48 ADCAP Mod 5 and below, and so they include the Torpedo Propulsion Upgrade (TPU) modification required for forebody/ afterbody compatibility.

Raytheon also manufactures the AN/BYG-1 combat management system used in new American submarines and scheduled for retrofit to older Los Angeles Class boats and the Royal Australian Navy’s Collins Class submarines. This reportedly allows for a degree of synergy that improves the Mk-48 ADCAP torpedo’s effectiveness.

Mk54 HAWC
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The Mk-54, on the other hand, stemmed from the need for a smaller, lighter, but cost effective advanced torpedo that could be dropped from helicopters, planes, and smaller ships. To achieve this, it combined the expensive Mk-50’s search and homing system with the propulsion system of the Mk-46 torpedo (the previous NATO/US standard), and added off-the-shelf electronic components. Its size improves its ability to go after targets in shallower littoral regions, but it is designed for both deep water and near-shore or shallow environments. It is the primary torpedo system used by US P-3C Orion aircraft, for instance, and a kit called HAAWC/Longshot is under development by Lockheed Martin to allow launches from high altitude instead of the usual ceiling of several hundred feet. Cost estimates for this weapon are around $1 million each.

The MU90 Eurotorp is the Mk-54’s primary international competitor. It has been very successful in the international marketplace, and has been selected by Australia as its main lightweight torpedo.

Team Torpedo Contracts & Key Events

Loading a Mk-48
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Unless otherwise specified, contracts are awarded under consolidated contract # N00024-04-C-6101 by The Naval Sea Systems Command in Washington, DC, to Raytheon Integrated Defense Systems Keyport in Keyport, WA.

Oct 9/08: A $171.1 million modification to previously awarded contract (N00024-04-C-6101) to provide MK48 and MK54 torpedoes on a firm fixed-price basis, plus engineering and support. This is a continuation of MK48 ADCAP, MK48 CBASS and MK54 torpedo programs under contracts N00024-98-C-6107, N00024-00-C-6100, N00024-00-C-6102 and N00024-03-C-6104. The total amount funded at contract award will be $166.3 million, and contract funds in the amount of $48.9 million will expire at the end of the current fiscal year (Sept 30/09)

July 28/08: A $12.3 million modification to previously awarded contract (N00024-04-C-6101) for production material in support of the FY 2007/2008 MK48/MK54 torpedo buy. This effort is a continuation of MK48 ADCAP, MK48 CBASS and MK54 torpedo programs under contracts N00024-98-C-6107, N00024-00-C-6100, N00024-00-C-6102 and N00024-03-C-6104. Work will be performed in Keyport, WA and is expected to be complete by September 2008.

Dec 21/06: Raytheon announces that Naval Sea Systems Command has awarded them a $12.5 million contract for technical engineering, repair and maintenance services in support of the MK48 Advanced Capability (ADCAP) heavyweight torpedo. This award is a contract modification exercising a one-year option that was included in the original technical services contract awarded in April 2006. Under the contract, IDS will perform intermediate-level maintenance, repair and refurbishment of MK48 ADCAP torpedoes currently in the U.S. Navy’s fleet inventory of training and warshot torpedoes. The inventory is used for fleet training, readiness and submarine-launched torpedo warshot exercises. Work on the contract will be performed in Pearl Harbor, HI; Yorktown, VA; and Poulsbo, WA.

Dec 7/06: A NAVSEA announcement notes that the first Warshot MK 48 Mod 7 Advanced Capability (ADCAP) Common Broadband Advanced Sonar System (CBASS) Heavyweight Torpedoes were delivered to the Fleet and loaded aboard the Improved Los Angeles Class submarine USS Pasadena [SSN 752] in Pearl Harbor, HI. See NAVSEA release for further details.

Aug 1/06: A $5 million firm-fixed-price modification to purchase additional spares, and issue a technical issue to support fleet operational requirements for the various torpedo product lines. This will satisfy additional fiscal year 2006 Navy and Royal Australian Navy requirements for MK48 advanced capability and MK54 Mod 6 lightweight torpedo spares and MK48 common broadband advanced sonar system Mod 7 heavyweight production engineering support. This modification combines requirements for the US Navy (99%) and the Royal Australian Navy (1%). Work will be performed in Keyport, WA (90%), and Portsmouth, RI (10%), and is expected to be complete by June 2009.

July 31/06: An estimated $95.4 million firm-fixed-price modification for the necessary quantities of Mk48 heavyweight torpedo and Mk 54 lightweight torpedo support services necessary to support fleet operational requirements. It represents the consolidated MK48 and MK54 torpedo kit hardware buy, with engineering and repair services. This contract combines support for the US Navy (70%) and the Government of Australia (30%) under the foreign military sales program. Work will be performed at Raytheon’s Torpedo and Readiness Center, co-located with the U.S. Navy at NUWC Division Keyport and at the Maritime Mission Center in Portsmouth, RI (10%) and in Keyport, WA (90%), and is expected to be complete by June 2009.

For the modifications announced on July 31 and August 1, 2006 under the consolidated torpedo contract, Raytheon will deliver electronic systems and components, spares and services for 105 MK-54 lightweight torpedoes and 107 MK-48 heavyweight torpedoes. They will also support the MK-48 upgrade and configuration to CBASS standard, which entered full-rate production in June 2006. The August 1,2006 contract also covers torpedo spares, production engineering and technical support for fleet operational requirements for the U.S. and Royal Australian Navy’s inventories.

These were described as “fiscal year 2006 procurement quantities,” indicating that this is the full order for the year.

Jan 11/05: A $78.7 million firm-fixed-price modification to previously awarded contract (N00024-04-C-6101) for fiscal year 2005 consolidated MK-48 and MK-54 torpedo hardware and associated engineering and repair services. Work will be performed in Keyport, WA (90%) and Portsmouth, RI (10%), and is expected to be completed by September 2007. Contract funds will not expire at the end of the current fiscal year. This modification supports requirements for the U.S. Navy (90%) and Royal Australian Navy (10%), under the Foreign Military Sales program. The Naval Sea Systems Command, Washington, D.C., is the contracting activity.

Oct 26/04: Raytheon begins full rate production of the Mk54 lightweight torpedo. “Under the consolidated procurement contract for fiscal year 2004, Raytheon will deliver 51 MK54 lightweight torpedoes and associated whole-life support services. The five-year contract value, including exercised options, is expected to exceed $500 million.” See complete news release.

June 22/04: Raytheon Systems Co. Integrated Defense Systems in Keyport, WA received a firm-fixed price letter contract with a not to exceed value of $70.2 million for the consolidated procurement of FY 2004 undersea weapons requirements including 91 MK48 advanced capability (ADCAP) Mod 6 heavyweight torpedoes, including 15 kits in support of the next generation MK-48 CBASS Mod 7 initial production; production enginnering for the MK48 Common Broadband Advanced Sonar System (CBASS) Mod 7 heavyweight (HWT); 51 MK54 Mod 6 lightweight (LWT) torpedoes; and associated support services.

This effort is a continuation of MK48 ADCAP, MK48 CBASS and MK54 torpedo for the primary purpose of purchasing the necessary quantities of torpedoes and support services necessary to support further operational evaluation, future milestone decisions, and initial operational capability for the various torpedo product lines. Work will be performed in Keyport, WA (90%) and Portsmouth, RI (10%), and is expected to be completed by June 2009. Contract funds will not expire at the end of the current fiscal year. This contract was not competitively procured. The Naval Sea Systems Command, Washington, D.C., is the contracting activity (N00024-04-C-6101).

See also Raytheon release, which adds 20 MK-48 ADCAP Mod6 kits for Australia to the above totals.

Additional Readings

• Department Of The Navy Fiscal Year (FY) 2006/FY 2007 Budget Estimates (February 2005) – Justification Of Estimates: Weapons Procurement, Navy [PDF format]

• Jane’s – Background Information: Mk 48 ADCAP

• GlobalSecurity.org – Mk-48 Torpedo

• Navysite.de – Mk-48 Torpedo

• Deagel – Mark 54

• Federation of American Scientists – MK-54 Lightweight Hybrid Torpedo

• Raytheon – Mark 46, Mark 48, Mark 50 Torpedoes. No, they don’t include their own Mk-54 on their site.

• Eurotorp Consortium

• US Dept. of the Navy Acquisition One Source – Exchange of Non-Excess Property for New Assets in the MK46 and MK54 Torpedo Programs. Innovative idea.

• DID (May 31/07) – Longshot: A Swooping HAAWC for Torpedos. Enables high-altitude launch, turning the Mk54 into a GPS-guided glide weapon that releases the torpedo near sea level.

• Australian Defence Materiel Organization (June 21/06) – JP 2070 ADF – Lightweight ASW Torpedo – Project Djimindi. Selected the MU90 Eurotorp.

• Spacewar (June 14/06) – Navy Selects LockMart For MK-54 Torpedoes High Altitude Launch Capability

• DID (Nov 15/05) – Australia’s Collins Class Subs, Submariners On Track for Upgrades. Mk-48 ADCAP torpedos are part of those upgrades.

• Seapower Magazine (June 2005) – Boeing Eyes High-Flying Torpedo. For the P-8A MMA program. The 737-based P-8A is a capable aircraft, but doesn’t do as well as a turboprop when flying just 100 feet above the waves.

• Undersea Warfare Magazine (Winter/Spring 2002) – Torpedoes and the Next Generation of Undersea Weapons

• Thanks to reader Gregory L. Bender, P.E. of Defense Holdings, Inc. for catching an (incorrect) reference to the Mk48’s use on surface ships. At present, they use smaller Mk46 and Mk50 torpedoes.