Specifications

General Description:
Amphibious transport dock ships are warships that embark, transport, and land elements of a landing force for a variety of expeditionary warfare missions.

Features:
LPDs are used to transport and land Marines, their equipment and supplies by embarked air cushion (LCAC) or conventional landing craft and Expeditionary Fighting Vehicles (EFV) or Amphibious Assault Vehicles (AAV) augmented by helicopters or vertical take off and landing aircraft (MV 22). These ships support amphibious assault, special operations or expeditionary warfare missions and can serve as secondary aviation platforms for amphibious ready groups.

Background:
As the San Antonio-class LPDs have entered service in recent years, Austin-class LPDs have been decommissioned. Collectively, these ships functionally replace over 41 ships (LPD 4, LSD 36, LKA 113, and LST 1179 classes of amphibious ships) providing the Navy and Marine Corps with modern, seabased platforms that are networked, survivable, and built to operate with 21st century transformational platforms, such as the MV-22 Osprey, the Expeditionary Fighting Vehicle (EFV), and future means by which Marines are delivered ashore. A contract for final design and construction of San Antonio (LPD 17), the lead ship in the class, was awarded in December 1996; actual construction commenced in August 2000. USS San Antonio was delivered to the Navy in July 2005. LPDs 18-23 have also been delivered to the Navy. New York (LPD 21) is the first of three LPD 17-class ships built in honor of the victims of the Sept. 11, 2001, terrorist attacks. The ships bow stem was constructed using 7.5 tons of steel salvaged from the World Trade Center. The Navy named the 8th and 9th ships of the class -- Arlington and Somerset -- in honor of the victims of the attacks on the Pentagon and United Flight 93, respectively. Arlington and Somerset are also incorporating materials salvaged from those sites. LPDs 24-27 are currently under construction at Huntington Ingalls Industries (HII) on the Gulf Coast, and will deliver over the next few years. The Navy awarded a long lead time material contract to HII for LPD 27 in 2010.

General Characteristics, San Antonio Class Amphibious Transport Dock - LPD

Builder: Huntington Ingalls Industries (formerly Northrop Grumman Ships Systems), with Raytheon Systems Corporation and Intergraph Corporation.

Propulsion: Four sequentially turbocharged marine Colt-Pielstick Diesels, two shafts, 41,600 shaft horsepower.

Length: 684 feet (208.5 meters).

Beam: 105 feet (31.9 meters).

Displacement: Approximately 25,586 long tons (full load).

Speed: 22 knots

Crew: Ship's Company: 380 Sailors (29 officers, 351 enlisted) and 3 assigned Marines.
Embarked Landing Force: 699 (66 officers, 633 enlisted); surge capacity to 800.

Armament: Two MK 46 Mod 2 guns, fore and aft; two Rolling Airframe Missile (RAM) launchers, fore and aft: nine .50 caliber machine guns.

130326-N-BM466-033 USS ANCHORAGE, At Sea (March 26, 2013) Sailors assigned to San Antonio-class amphibious transport dock Anchorage (LPD 23) fired off the ship's rolling air frame missiles (RAM) as part of a combat systems certification that took place off the coast of Southern California. Anchorage is set to commission in her namesake city of Anchorage, Alaska, in May. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kristopher Regan/RELEASED)


Aircraft: Launch or land two CH53E Super Stallion helicopters or two MV-22 Osprey tilt rotor aircraft or up to four CH-46 Sea Knight helicopters, AH-1 or UH-1 helicopters.

Landing/Attack Craft: Two LCACs or one LCU; and 14 Expeditionary Fighting Vehicles/Amphibious Assault Vehicles.

Medical:
    Two Operating Rooms
    24 Person Hospital Ward
    100 Casualty Overflow Capacity

Electric Plant:
    5 - 2500 KW Ship Service Marine Diesel Generators
    5 - Main Ship Service 60 Hz SWBS
    3 - Ship Service 400 Hz SWBS
    3 - 60 to 400 Hz solid State Frequency changers
    Zonal 60 Hz Power distribution system
    Advanced Degaussing System

Auxiliaries:
    7 - 700 KW Non-CFC Air conditioning Plants
    5 - 12000 GPD Reverse Osmosis Desalination Plants
    10 - 1000 GPM Navy Standard Firepumps
    2 - HP Air Compressors
    3 - LP Air Compressors
    3 - Deballast Air Compressors

Navigation:
    Digital Flux Gate Magnetic Compass
    AN/WSN-7(V)1 Inertial Navigation System
    AN/WQN-2 Doppler Sonar Velocity Log System
    AN/UQN-4A Sonar Sounding Set, Dead Reckoning System
    Navigation Telex System
    AN/SSN-6 NAVSSI

Command & Control:
    AN/SPQ-12(V) Radar Display Dist. Distribution System
    MK 2 SSDS
    AN/USQ-119C(V)27 JMCIS
    AN/KSQ-1 Amphibious Assault Direction System
    MK 91, 2 Channel MFCS
    AN/USG-2 CEC

Radar Systems:
    AN/SPS-48E
    AN/SPQ-9B
    AN/SPS-73

EW & Decoy Systems:
    AN/SLQ-25A NIXIE
    AN/SLQ-32Q(V)2
    MK 36 SRBOC
    MK 53 / NULKA