Mark 54 Lightweight Torpedo

The Mark 54 Lightweight Torpedo (formerly known as Lightweight Hybrid Torpedo, or LHT) is a standard 12.75 inch (324 mm) anti-submarine warfare (ASW) torpedo used by the United States Navy.

Mark 54 Lightweight Torpedo
Mark 54 Torpedo aboard the USS Ross (DDG-71) in March 2008.
Type	Lightweight torpedo
Place of origin	United States
Service history
In service	2004–present
Used by	United States Navy Royal Australian Navy Indian Navy Royal Air Force Royal Thai Navy Royal Netherlands Navy
Production history
Designer	Raytheon Systems
Designed	1999
Unit cost	US$839,320 (FY2014)[1]
Produced	2003
Specifications
Mass	608 lb (276 kg)[2]
Length	106.9 in (2.72 m)[2]
Diameter	12.75 in (324 mm)[2]
Warhead	PBXN-103
Warhead weight	96.8 lb (43.9 kg)[2]
Blast yield	238lb TNT
Engine	reciprocating external combustion
Propellant	Otto II (liquid)
Operational range	approx. 10 km
Maximum speed	>40 kn (74.1 km/h; 46.0 mph)
Guidance system	Active or passive/active Acoustic homing
Launch platform	Mark 32 Surface Vessel Torpedo Tubes, ASW Aircraft, RUM-139 VL-ASROC

Development

The Mark 54 was co-developed by Raytheon Integrated Defense Systems and the U.S. Navy under the U.S. Navy's Lightweight Hybrid Torpedo program in response to perceived problems with the extant Mark 50 and Mark 46 torpedoes. The Mk 50, having been developed to counter very high performance nuclear submarines such as the Soviet Alfa class, was seen as too expensive to use against relatively slow conventional submarines. The older Mk 46, designed for open-ocean use, performed poorly in the littoral areas, where the Navy envisioned itself likely to operate in the future.

USS Roosevelt (DDG-80) launches a Mk 54 torpedo.

The Mk 54 was created by combining the homing portion of the Mk 50 and the warhead and propulsion sections of the Mk 46, improved for better performance in shallow water, and with the addition of commercial off-the-shelf (COTS) technology to further reduce costs. It shares much of the software and computer hardware of the Mk 48 ADCAP heavy torpedo, based around a custom PowerPC 603e chip.

Developmental testing began in July 1999, and a successful critical design review was completed in November 1999.

In April 2003, Raytheon was awarded a sole source contract for the production of the Mk 54. Full rate production began in October 2004. In March 2010 the Fifth Fleet requested improvements in the Mk 54's performance against diesel-electric submarines via an Urgent Operational Need Statement (UONS). This led to a software Block Upgrade (BUG) program which began testing in August 2011 and which continues, having been criticised by the Director, Operational Test and Evaluation (DOT&E) for using unrealistic proxies for threat submarines.[3]

The Mk 54 can be fired from surface ships via the Mark 32 surface vessel torpedo tubes or the vertical launch anti-submarine rocket (ASROC) systems, and also from most ASW aircraft, although they are slightly different lengths and weights. The P-8 Poseidon uses the High-Altitude Anti-Submarine Warfare Weapons Capability (HAAWWC) GPS-guided parachute kit to drop torpedoes from high altitude.

The FY14 DOT&E report assessed the Mk 54 (BUG) torpedo as not operationally effective in its intended role. "During operationally challenging and realistic scenarios, the Mk 54 (BUG) demonstrated below threshold performance and exhibited many of the same failure mechanisms observed during the FY 2004 initial operational testing". Shortfalls were also identified with the employing platforms’ tactics and tactical documentation, and interoperability problems with some platform fire control systems.[4]

Users

The Mark 54 is carried by the U.S. Navy and the Royal Australian Navy. In October 2010, Australia ordered 200 more torpedoes.[5]

In June 2011, it was reported that India will get 32 Mk 54 All-Up-Round Lightweight Torpedoes and associated equipment, parts, training and logistical support for an estimated cost of $86 million through U.S. government's Foreign Military Sales program for P-8I LRMP.[6]

In January 2018 it was announced that the P-8 Poseidon aircraft to be operated by the RAF will carry the Mk 54.[7]

In 2018 the acquisition of MK 54 torpedo's by the Royal Netherlands Navy via the Foreign Military Sales process.

In early 2018 the U.S. State Department approved the sale of Mark 54 torpedoes to the Mexican Navy, who will deploy them from their new Sigma-class design frigates, the first of which is being jointly built with Dutch shipbuilding company Damen Schelde Naval Shipbuilding. [8]

In April 2018, the US State Department cleared the sale of an additional 30 Mark 54 torpedoes to the Mexican Navy, which may be carried on MH-60R helicopters, which the Mexican Navy plans to order in the near future.[9]

In May 2019 Canada requested 425 Mk54 lightweight torpedo conversion kits, plus ancillary training, exercise and maintenance spare parts. This procurement will allow Canada to upgrade its current inventory of Mk46 torpedoes. If the sale is finalised, the Mk54 lightweight torpedoes are expected to be used on the Royal Canadian Navy’s Halifax-class ships, and the Royal Canadian Air Force’s CP-140 Aurora aircraft. The torpedoes are also planned to be deployed from the CH-148 maritime helicopters.[10]

See also

• APR-3E torpedo - Russian equivalent
• A244-S - Italian equivalent
• MU90 Impact - French/Italian equivalent
• Sting Ray (torpedo) - British equivalent
• TAL Shyena - Indian equivalent
• Yu-7 torpedo - Chinese equivalent

References

1. "Senate Report 113-044 - NATIONAL DEFENSE AUTHORIZATION ACT FOR FISCAL YEAR 2014". Library of Congress. 20 June 2013. Retrieved 7 November 2013. 150 Mk 54 cost $125.898m in financial year 2014
2. "Fact File: Mk54 Torpedo". US Navy. 27 November 2012. Archived from the original on 13 May 2013. Retrieved 7 November 2013.
3. "Mk 54 Lightweight Torpedo" (PDF). Director, Operational Test & Evaluation (DOT&E). 2012. Archived from the original (PDF) on 26 August 2014. Retrieved 7 November 2013.
4. "Mk 54 Lightweight Torpedo FY14" (PDF). Director, Operational Test & Evaluation (DOT&E). 2015. Archived from the original (PDF) on 31 May 2015. Retrieved 25 January 2015.
5. "Team Torpedo: US Firms Sell & Support MK48s and MK54s". Defense Industry Daily. 21 August 2014. Archived from the original on 15 September 2012. Retrieved 12 October 2010.
6. "US clears sale of anti-submarine torpedoes to Indian Navy". The Indian Express. 28 June 2011. Archived from the original on 15 September 2012. Retrieved 29 June 2011.
7. "Britain to Purchase Mk 54 Lightweight Torpedo array kits destined for P-8 Poseidon". UK Defence Journal. 4 January 2018. Archived from the original on 5 January 2018. Retrieved 4 January 2018.
8. http://www.dsca.mil/major-arms-sales/mexico-harpoon-block-ii-missiles-ram-missiles-and-mk-54-torpedoes/ Archived 4 May 2018 at the Wayback Machine January 2018, Defense Security Cooperation Agency
9. https://thedefensepost.com/2018/04/20/us-approves-sale-mexico-mh-60r-seahawk-helicopters/ Archived 4 May 2018 at the Wayback Machine - April 2018, The Defense Post
10. https://www.naval-technology.com/news/canada-requests-387m-sale-of-mk-54-torpedoes-from-us/ Archived 23 May 2019 at the Wayback Machine - 22 May 2019, Naval Technology

External links

• MK-54 Lightweight Hybrid Torpedo via FAS
• MK-54 at deagel.com