Editing Los Angeles-class submarine (section)

==Design==

===Flights===
[[File:SSN719.svg|thumb|left|280px|Flight II 688 VLS.]]
[[File:SSN772.svg|thumb|left|280px|Flight III 688I.]]
In 1982, after building 31 boats, the class underwent a minor redesign. The following eight that made up the second "flight" of subs had 12 new vertical launch tubes that could fire [[Tomahawk (missile family)|Tomahawk missile]]s. The last 23 had a significant upgrade with the '''688i''' improvement program. These boats are quieter, with more advanced electronics, sensors, and noise-reduction technology. The [[diving plane]]s are placed at the bow rather than on the [[Sail (submarine)|sail]], and are retractable.<ref>{{cite web |url=http://nationalinterest.org/commentary/the-five-best-submarines-all-time-9728 |title=The Five Best Submarines of All Time |first=Robert |last=Farley |work=[[The National Interest]] |date=18 October 2014 |url-status=live |archive-url=https://web.archive.org/web/20141020161239/http://nationalinterest.org/commentary/the-five-best-submarines-all-time-9728 |archive-date=20 October 2014 }}</ref> A further four boats were proposed by the Navy, but later cancelled.<ref>{{Cite book |last=Polmar |first=Norman |url=https://archive.org/details/navalinstitutegu0000polm_19ed/ |title=The Naval Institute Guide to Ships and Aircraft of the U.S. Fleet |publisher=Naval Institute Press |year=2013 |isbn=9781591146872 |edition=19th |location=Annapolis, Maryland |page=82 |url-access=registration}}</ref>

===Capabilities===
[[File:LA sub1.jpg|thumb|Crewmen monitor consoles at the diving station aboard a ''Los Angeles''-class submarine]]
According to the [[U.S. Department of Defense]], the top speed of the submarines of the ''Los Angeles'' class is over {{convert|25|kn|lk=in}}, although the actual maximum is classified. Some published estimates have placed their top speed at {{convert|30|to|33|kn}}.<ref name="Polmar">{{cite book |last1=Polmar |first1=Norman |last2=Moore |first2=Kenneth J. |title=Cold War Submarines: The Design and Construction of U.S. and Soviet Submarines |page=271 |publisher=Brassey's |year=2003 |isbn=1-57488-594-4}}</ref><ref>{{cite book|last=Tyler |first=Patrick |author-link=Patrick Tyler |title=Running Critical |publisher=Harper and Row |year=1986 |location=New York |pages=24, 56, 66–67 |isbn=978-0-06-091441-7}}</ref> In his book ''Submarine: A Guided Tour Inside a Nuclear Warship'', [[Tom Clancy]] estimated the top speed of ''Los Angeles''-class submarines at about {{convert|37|kn}}.

The U.S. Navy gives the maximum operating depth of the ''Los Angeles'' class as {{convert|650|ft|m|abbr=on}},<ref>{{cite book |last=Waddle |first=Scott |author-link=Scott Waddle |title=The Right Thing |publisher=Integrity Publishers |year=2003 |isbn=1-59145-036-5 |pages=xi (map/diagram) |quote=This reference is for operating depth only |url=https://archive.org/details/rightthing00wadd }}</ref> while [[Patrick Tyler]], in his book ''Running Critical'', suggests a maximum operating depth of {{convert|950|ft|m|abbr=on}}.<ref>Tyler, (1986). pp. 66–67, 156</ref> Although Tyler cites the 688-class design committee for this figure,<ref>"Notes in pp. 64–67: Deliberations of ad-hoc committee on SSN 688 design taken from confidential sources and from interviews with Admiral [Ret] Rickover. ..." From Tyler, p. 365</ref> the government has not commented on it. The maximum diving depth is {{convert|1475|ft|m|abbr=on}} according to ''[[Jane's Fighting Ships]], 2004–2005 Edition'', edited by Commodore Stephen Saunders of the Royal Navy.<ref>Saunders, (2004). pp. 838</ref>

===Weapons===
[[File:USS Santa Fe (SSN-763) VLS doors open.jpg|thumb|A portside bow view of the fore section of {{USS|Santa Fe|SSN-763|6}} tied up at the pier in February 1994: The doors of the Mark 36 vertical launch system for the Tomahawk missiles are in the "open" position.]]
''Los Angeles''-class submarines carry 24 [[torpedo tube]]-launched weapons, as well as Mark 67 and [[Mark 60 CAPTOR]] [[Naval mine|mines]] and were designed to launch [[Tomahawk (missile family)|Tomahawk]] [[cruise missile]]s, and [[Harpoon (missile)|Harpoon missiles]] horizontally (from the torpedo tubes). The last 31 boats of this class (Flight II and Flight III/688i) also have 12 dedicated [[vertical launching system]] tubes for launching Tomahawks. The tube configuration for the first two boats of Flight II differed from the later ones: ''Providence'' and ''Pittsburgh'' have four rows of three tubes vs. the inner two rows of four and outer two rows of two tubes found on other examples. The 688i ("improved") model submarines are capable of deploying the Mk 67 [[Submarine Launched Mobile Mines]].<ref name="Winnefeld 2023">Winnefeld, James A. "[https://www.usni.org/magazines/proceedings/2023/december/mine-warfare-could-be-key|Mine Warfare Could Be Key]." ''Proceedings of the U.S. Naval Institute'', December 2023.</ref>

===Control systems===
Over close to 40 years, the control suite of the class has changed dramatically. The class was originally equipped with the Mk 113 mod 10 fire control system, also known as the Pargo display program. The Mk 113 runs on a [[AN/UYK-7|UYK-7]] computer.<ref>{{cite book|title=U.S. Submarines Since 1945: An Illustrated Design History|page=118}}</ref><ref>{{cite web|url=http://vipclubmn.org/sysnavy.html|title=Systems, Navy Chapter|website=vipclubmn.org|url-status=live|archive-url=https://web.archive.org/web/20121002232805/http://vipclubmn.org/sysnavy.html|archive-date=2 October 2012}}</ref>

The Mk 117 FCS, the first "all [[Digital electronics|digital]]" [[fire control system]], replaced the Mk 113. The Mk 117 transferred the duties of the analog Mk 75 attack director to the UYK-7, and the digital Mk 81 weapon control consoles, removing the two analog conversions, and allowing "all digital" control of the digital Mk 48 control.<ref>{{cite book|last1=Friedman|first1=Norman|title=The Naval Institute Guide to World Naval Weapons Systems, 1997–1998|date=1997|publisher=Naval Institute Press|isbn=9781557502681|page=152}}</ref> The first 688 sub to be built with the Mk 117 was {{USS|Dallas|SSN-700|6}}.

The Mark 1 Combat Control System/All Digital Attack Center replaced the Mk 117 FCS, on which it was based. The Mk 1 CCS was built by [[Lockheed Martin]], and gave the class the ability to fire Tomahawk missiles.<ref>{{cite web |url=https://fas.org/man/dod-101/sys/ship/weaps/mk-1-css.htm |title=Mk 1 Combat Control System &#91;CCS&#93; |access-date=4 April 2015 |url-status=live |archive-url=https://web.archive.org/web/20150409020527/https://fas.org/man/dod-101/sys/ship/weaps/mk-1-css.htm |archive-date=9 April 2015 }}</ref> The CSS internal tracker model provides [[Electronic data processing|processing]] for both [[Towed array sonar|towed-array]] and spherical-array trackers. [[Sonar|Trackers]] are signal followers that generate bearing, arrival angle, and frequency reports based on information received by an acoustic sensor. It incorporated the Gyro Static Navigator into the system in replacement of the AN/WSN-1 DMINS (Dual Mini Ship's [[Inertial navigation system]])<ref name="fas-man-DMINS">{{cite web |title=Electronics Material Officer Course – Navigation Systems/Equipment  |url=https://man.fas.org/dod-101/navy/docs/swos/e1/MOD4LES4.html |website=man.fas.org |publisher=[[Federation of American Scientists]] |access-date=22 September 2024}}</ref> of the earlier 688 class.

The Mk 1 CCS was replaced by the Mk 2, which was built by [[Raytheon]]. Mk 2 provides Tomahawk Block III vertical launch capability as well as fleet-requested improvements to [[Mark 48 torpedo|Mk 48 ADCAP torpedo]] and Towed Array Target Motion Analysis operability. The Mk 2 CCS paired with the AN/BQQ-5E system is referred to as the QE-2" system. The CCS MK2 Block 1 A/B system architecture extends the CCS MK2 tactical system with a network of tactical advanced computers (TAC-3). These TAC-3s are configured to support the SFMPL, NTCS-A, LINK-11 and ATWCS subsystems.

===Sensors===
====Sonar====
=====AN/BQQ-5=====
AN/BQQ-5 sensor suite consists of the AN/BQS-13 spherical sonar array and AN/UYK-44 computer. The AN/BQQ-5 was developed from the AN/BQQ-2 sonar system. The BQS 11, 12, and 13 spherical arrays have 1,241 transducers. Also equipped are a conformal hull array with 104 to 156 hydrophones and two towed arrays: the TB-12 (later replaced by the TB-16) and TB-23 or TB-29, of which there are multiple variants. There are five versions of the AN/BQQ-5 system, sequentially identified by letters A–E.

The 688i (Improved) subclass was initially equipped with the AN/BSY-1 SUBACS submarine advanced combat system that used an AN/BQQ-5E sensor system with updated computers and interface equipment. Development of the AN/BSY-1 and its sister the AN/BSY-2 for the {{sclass|Seawolf|submarine|4}} was widely reported as one of the most problematic programs for the Navy, its cost and schedule suffering many setbacks.

A series of conformal passive hydrophones are hard-mounted to each side of the hull, using the AN/BQR-24 internal processor. The system uses FLIT (frequency line integration tracking) which homes in on precise narrowband frequencies of sound and, using the Doppler principle, can accurately provide firing solutions against very quiet submarines. The AN/BQQ-5's hull array doubled the performance of its predecessors.

=====AN/BQQ-10=====
The AN/BQQ-5 system was replaced by the AN/BQQ-10 system. Acoustic Rapid Commercial Off-The-Shelf Insertion (A-RCI), designated AN/BQQ-10, is a four-phase program for transforming existing submarine sonar systems (AN/BSY-1, AN/BQQ-5, and AN/BQQ-6) from legacy systems to a more capable and flexible COTS/Open System Architecture (OSA) and also provide the submarine force with a common sonar system. A single A-RCI Multi-Purpose Processor (MPP) has as much computing power as the entire ''Los Angeles'' (SSN-688/688I) submarine fleet combined and will allow the development and use of complex algorithms previously beyond the reach of legacy processors. The use of COTS/OSA technologies and systems will enable rapid periodic updates to both software and hardware. COTS-based processors will allow computer power growth at a rate commensurate with the commercial industry.<ref>{{cite web |url=https://fas.org/man/dod-101/sys/ship/weaps/an-bqq-10.htm |title=BQQ-10 A-RCI Acoustic Rapid COTS Insertion |access-date=4 April 2015 |url-status=live |archive-url=https://web.archive.org/web/20150409015938/https://fas.org/man/dod-101/sys/ship/weaps/an-bqq-10.htm |archive-date=9 April 2015 }}</ref>

===Engineering and auxiliary systems===
[[File:Ssn 759 deck.jpg|thumb|The aft end of the control room for {{USS|Jefferson City|SSN-759|6}} in June 2009]]
Two watertight compartments are used in the ''Los Angeles''-class submarines. The forward compartment contains crew living spaces, weapons-handling spaces, and control spaces not critical to recovering propulsion. The aft compartment contains the bulk of the submarine's engineering systems, power generation turbines, and water-making equipment.<ref>SSN-688 ''Los Angeles'' Class Design. [http://www.globalsecurity.org/military/systems/ship/ssn-688-design.htm Los Angeles Class] {{webarchive|url=https://web.archive.org/web/20080415203456/http://www.globalsecurity.org/military/systems/ship/ssn-688-design.htm |date=15 April 2008 }} at Globalsecurity.org.  Accessed on 7 January 2009</ref> Some submarines in the class are capable of delivering [[Navy SEAL]]s through either a [[SEAL Delivery Vehicle]] deployed from the [[Dry Deck Shelter]] or the [[Advanced SEAL Delivery System]] mounted on the dorsal side, although the latter was cancelled in 2006 and removed from service in 2009.<ref>Polmar & Moore, (2003).  pp. 263</ref> A variety of atmospheric control devices are used to allow the vessel to remain submerged for long periods of time without ventilating, including an [[Electrolytic cell|electrolytic]] [[oxygen generator]], which produces oxygen for the crew and hydrogen as a byproduct. The hydrogen is pumped overboard but there is always a risk of fire or explosion from this process.<ref name=fas /><ref>Treadwell Supplies Oxygen Generator Components for Nuclear Subs [http://www.defenseindustrydaily.com/treadwell-supplies-oxygen-generator-components-for-nuclear-subs-2-04690/ Defense Industry Daily] {{webarchive|url=https://web.archive.org/web/20101216024150/http://www.defenseindustrydaily.com/treadwell-supplies-oxygen-generator-components-for-nuclear-subs-2-04690/ |date=16 December 2010 }} 28-January-2008</ref>

[[File:USS Greeneville (SSN-772).jpg|thumb|{{USS|Greeneville|SSN-772|6}} with an attached [[Advanced SEAL Delivery System|ASDS]]]]
While on the surface or at snorkel depth, the submarine may use the submarine's auxiliary or emergency [[Diesel-electric transmission|diesel generator]] for power or ventilation<ref>Fairbanks Morse Engines [http://www.fairbanksmorse.com/installations_marine.php Marine Installations] {{webarchive|url=https://web.archive.org/web/20080926105037/http://www.fairbanksmorse.com/installations_marine.php |date=26 September 2008 }} Accessed on 29 April 2008</ref><ref>Auxiliary Division on USS Cheyenne [https://fas.org/man/dod-101/navy/unit/dept-ssn-773.htm#ENGINEERING%20DEPARTMENT USS ''Cheyenne''  SSN-773 Department & Divisions] {{webarchive|url=https://web.archive.org/web/20150409020439/https://fas.org/man/dod-101/navy/unit/dept-ssn-773.htm |date=9 April 2015 }} from [[Federation of American Scientists]]. Accessed on 29 April 2008</ref> (e.g., following a fire).<ref>Firefighting and Damage Control Update [http://www.dcfp.navy.mil/library/dcra/181044ZJUN98.htm 181044Z JUN 98 (SUBS) Message] {{webarchive|url=https://web.archive.org/web/20090114121731/http://www.dcfp.navy.mil/library/dcra/181044ZJUN98.htm |date=14 January 2009 }} [[COMSUBLANT]] (1998) Accessed on 29 April 2008</ref> The diesel engine in a 688 class can be quickly started by compressed air during emergencies or to evacuate noxious (non[[Volatile (astrogeology)|volatile]]) gases from the boat, although 'ventilation' requires raising a snorkel mast. During nonemergency situations, design constraints call for operators to allow the engine to reach normal operating temperatures before it is capable of producing full power, a process that may take from 20 to 30 minutes. However, the diesel generator can be immediately loaded to 100% power output, despite design criteria cautions, at the discretion of the submarine commander on the recommendation of the submarine's engineer, if necessity dictates such actions to: (a) restore electrical power to the submarine, (b) prevent a reactor incident from occurring or escalating, or (c) to protect the lives of the crew or others as determined necessary by the commanding officer.<ref>{{cite book|last1=DiMercurio |first1=Michael |last2=Benson |first2=Michael |title=The Complete Idiot's Guide to Submarines |place=New York |publisher=Alpha Books |year=2003 |pages=49–52 |isbn=978-0-02-864471-4}}</ref>

[[File:Periscope Depth.jpg|thumb|{{USS|Key West|SSN-722|6}} submerged at [[periscope depth]] off the coast of [[Honolulu]], [[Hawaii]] in July 2004]]

===Propulsion===
The ''Los Angeles'' class is powered by the General Electric [[S6G reactor|S6G]] [[pressurized water reactor]]. The hot reactor coolant water heats water in the steam generators, producing steam to power the propulsion turbines and ship service turbine generators (SSTGs), which generate the submarine's electrical power. The high-speed propulsion turbines drive the shaft and propeller through a reduction gear. In the case of a reactor plant casualty, the submarine has a diesel generator and a bank of batteries to provide electrical power. An emergency propulsion motor on the shaft line or a retractable 325-hp secondary propulsion motor power the submarine off the battery or diesel generator.

The S6G reactor plant was originally designed to use the D1G-2 core, similar to the D2G reactor used on the [[guided missile cruiser]] {{USS|Bainbridge|CGN-25|6}}. The D1G-2 core had a rated thermal power of 150 MW and the turbines were rated at 30,000 shp. All ''Los Angeles''-class submarines from {{USS|Providence|SSN-719|6}} on were built with a D2W core and older submarines with D1G-2 cores have been refueled with D2W cores. The D2W core is rated at 165 MW and turbine power rose to approximately 33,500 shp.<ref>[https://www.globalsecurity.org/military/systems/ship/systems/s6g.htm S6G] Accessed on 9 April 2020</ref>