Boeing P-8 Poseidon

The Boeing P-8 Poseidon (formerly the Multimission Maritime Aircraft or MMA) is a military aircraft developed for the United States Navy (USN). The aircraft has been developed by Boeing Defense, Space & Security, modified from the 737-800ERX.

The P-8 conducts anti-submarine warfare (ASW), anti-surface warfare (ASUW), and shipping interdiction, along with an electronic signals intelligence (ELINT) role. This involves carrying torpedoes, depth charges, SLAM-ER missiles, Harpoon anti-ship missiles, and other weapons. It is able to drop and monitor sonobuoys. It is designed to operate in conjunction with the Northrop Grumman MQ-4C Triton Broad Area Maritime Surveillance unmanned aerial vehicle. The aircraft has been ordered by the Indian Navy as the P-8I Neptune, and the Royal Australian Air Force. The Royal Air Force also intends to order the P-8.

Boeing P-8 Poseidon
Class Aircraft
Type Utility
Manufacturer Boeing Defense, Space & Security
Origin United States of America
Country Name Origin Year
United States of America 2009
Country Name Operational Year Retirement Year
Australia View
India View
United States of America 2013 View
ManufacturerName Production From Production To Quantity
Boeing Defense, Space & Security 2009 15 View

The P-8 is a militarized version of the Boeing 737-800 with 737-900-based wings. The fuselage is similar, but longer, than the 737-700-based C-40 Clipper transport aircraft in service with the United States Navy. The P-8 has a strengthened fuselage and Boeing 767-400ER-style raked wingtips, instead of the blended winglets available on 737NG variants. In order to power additional onboard electronics, the P-8 has a 180kVA electric generator on each engine, replacing the 90kVA generator of civilian 737s; this required the redesigning of the nacelles and their wing mountings.

The five operator stations (two naval flight officers plus three enlisted Aviation Warfare Operators/naval aircrewman) are mounted in a sideways row, along the port side of the cabin. None of the crew stations have windows; a single observer window is located on each side of the forward cabin. A short bomb bay for torpedoes and other stores opens behind the wing. The P-8 is to be equipped with the High Altitude Anti-Submarine Warfare Weapon Capability (HAAWC) Air Launch Accessory (ALA), turning a Mark 54 torpedo into a glide bomb for deploying from up to 30,000 ft (9,100 m).

The P-8 features the Raytheon APY-10 multi-mission surface search radar; the P-8I features an international version of the APY-10. Unlike the preceding P-3, the P-8 lacks a magnetic anomaly detector (MAD) due to its higher operational altitude. Various sensor data are combined via data fusion software to track targets. Following the cancellation of Lockheed Martin's Aerial Common Sensor project, Boeing proposed a signals intelligence variant of the P-8 for the Navy's requirement.

In U.S. service, the P-8 fleet will be complemented by around 40 Northrop Grumman MQ-4C Triton unmanned aerial vehicles (UAVs) for the Broad Area Maritime Surveillance system to provide continuous surveillance. In January 2015, BAE Systems was awarded a contract for the Navy's High Altitude ASW (HAASW) Unmanned Targeting Air System (UTAS) program to develop a sub-hunting UAV equipped with a MAD for launching from the P-8. The P-8 cannot use the Navy's typical hose-and-drogue in-flight refueling method, instead featuring a flying boom receptacle on the upper-forward fuselage. For extended endurance, six additional fuel tanks from Marshall Aerospace are housed in the forward and rear cargo compartments.


The Lockheed P-3 Orion, a turboprop ASW aircraft, has been in service with the United States Navy since 1962. In the 1980s, the Navy began studies for a P-3 replacement, the range and endurance of which was reducing due to increasing weight and airframe fatigue life limitations. The specification required a new aircraft to have reduced operating and support costs. In 1989, the Navy awarded Lockheed a fixed-price contract to develop the P-7, but this was canceled the following year. A second competition for a replacement began in 2000. Lockheed Martin submitted the Orion 21, an updated new-build version of the P-3. Boeing's proposal was based on its 737-800 airliner. BAE Systems offered a new-build version of the Nimrod MRA4, a British jet-powered maritime patrol aircraft. BAE withdrew from the competition in October 2002, recognizing that without a production partner based in the United States, the bid was politically unrealistic. On 14 May 2004, Boeing was selected as the winner.

In June 2004, the U.S. Navy awarded a development contract to Boeing. The project was planned to be for at least 108 airframes for the Navy. More orders are possible from the other nations operating over 200 P-3s. Project value is expected to be worth at least $15 billion. Raytheon, Northrop Grumman, Spirit AeroSystems, GE Aviation Systems, Marshall Aerospace and Defence Group, CFMI, BAE Systems, and Marotta are major subcontractors. In July 2004, the Navy placed an order for five MMA aircraft, and the first flight-test aircraft was to be completed in 2009. On 30 March 2005, the P-8A designation was assigned to the aircraft.

Design phase and testing

The P-8 is to replace the P-3 Orion. At first, it will be equipped with legacy P-3 systems, but later upgrades will incorporate more advanced technology. The Government Accountability Office credited the incremental approach with keeping the project on schedule and on budget. In 2008, the Naval Air Systems Command (NAVAIR) deleted the requirement for the P-8A to be equipped with magnetic anomaly detection (MAD) equipment as part of an effort that reduced weight by 3,500 lb (1,600 kg) to improve endurance and range. A hydrocarbon sensor detects fuel vapors from diesel-powered submarines and ships.

The P-8's first flight was on 25 April 2009. The second and third P-8s had flown and were in flight testing in early August 2010. On 11 August 2010, the US approved the P-8 for low-rate production. A P-8 released sonobuoys for the first time on 15 October 2010, dropping six sonobuoys in three separate low-altitude passes. In 2011, it was found that the P-8's ice detection system was defective due to the use of counterfeit components; allegedly these computer parts were poorly refurbished and sold to subcontractor BAE Systems as new by a Chinese supplier.

The first production P-8A was handed over to the Navy on 4 March 2012. It flew to Naval Air Station Jacksonville, Florida, for training with the Fleet Replacement Squadron (FRS), Patrol Squadron 30 (VP-30). On 24 September 2012, Boeing announced a $1.9 billion order for 11 aircraft. On 10 June 2013, a DoD Inspector General (IG) report noted that the Navy should delay full-rate production over a lack of key information to assess if the P-8 meets operational requirements. Additional testing was also needed to guarantee a 25-year lifespan. Boeing executives dismissed the report, saying that the test program is on track. In 2013, full-rate production was delayed until the P-8 could demonstrate it can survive its 25-year lifespan without structural fatigue, overcome mission-limited deficiencies, track surface ships, and perform primary missions.

On 24 June 2013, a P-8 successfully scored a direct hit with a live AGM-84D Block IC Harpoon anti-ship missile during weapons integration testing. On 1 July 2013, an initial operational test and evaluation (IOT&E) report found that the P-8A was "operationally effective, operationally suitable, and ready for fleet introduction." Six test and nine low-rate initial production aircraft had been delivered at that point. On 31 July 2013, Boeing received a $2.04 billion contract to build 13 P-8As in the fourth low-rate initial production lot, for a fleet of 37 aircraft by the end of 2016, and long-lead parts for 16 P-8As of the first full-rate production lot.

As of September 2013 it was intended to replace all Navy P-3s with 117 P-8As by 2019, but budget cuts may delay this by two years. On 3 January 2014, the Naval Air Systems Command proceeded with full-rate production of the P-8A. Increment 1 systems include persistent anti-submarine warfare capabilities and an integrated sensor suite; in 2016, Increment 2 upgrades will add multi-static active coherent acoustics, an automated identification system, and high-altitude anti-submarine weapons. Increment 3 in 2020 shall enable "net-enabled anti-surface warfare".

In July 2014, Fred Smith, business development director for the P-8, noted that the program had proved "so efficient, it saved $2.1 billion on 2004 estimates of the cost of production"; and that "the aircraft is now selling for $150 million, down from the forecasted $216 million". The halving of USN orders from 16 aircraft per year down to 8 in 2015 due to the expiration of the Bipartisan Budget Act of 2013 was expected to be partially offset by commercial 737 sales and export sales of the P-8.


In 2010, Boeing proposed to replace the U.S. Air Force's Northrop Grumman E-8 Joint STARS fleet with a modified P-8 at the same cost Northrop Grumman proposed for re-engining and upgrading the E-8s. The proposed P-8 Airborne Ground Surveillance (AGS) would integrate an active electronically scanned array (AESA) radar, and have ground moving target indicator (GMTI) and synthetic aperture radar (SAR) capabilities.

The main distinguishing feature of the P-8 AGS was a pod-mounted radar on the lower centerline of the fuselage; the pod is lowered so the engine nacelles do not interrupt the radar's line of sight. Two aft ventral fins increase aircraft stability. The P-8 AGS reused the P-8A's Raytheon AN/APY-10 multi-mission surface search radar. In 2010, the Air Force launched an Analysis of Alternatives (AoA) of the JSTARS platform. In 2013, Boeing proposed repackaging P-8 systems in the smaller and less expensive Bombardier Challenger 600 series business jet, as the Boeing Maritime Surveillance Aircraft (MSA), instead. In 2014, Boeing also offered a JSTARS replacement based on the Boeing 737-700, rather than the P-8's 737-800.

United States

In February 2012, the P-8 made its mission debut during "Bold Alligator" 2012, an annual littoral warfare exercise. In April 2012, it took part in Exercise Joint Warrior, flying out of RAF Lossiemouth. During RIMPAC 2012 in the Hawaiian area, two P-8As participated in 24 scenarios as part of Air Test and Evaluation Squadron One (VX-1) while forward deployed to Marine Corps Base Hawaii. On 29 November 2013, the P-8's inaugural deployment began when six aircraft and 12 air crews of squadron VP-16 departed its home station of NAS Jacksonville, Florida, for Kadena Air Base in Okinawa, Japan. This forward deployment with the U.S. Pacific Fleet was pre-planned as part of a regional re-balance, but occurred shortly after China's establishment of the East China Sea Air Defense Identification Zone, heightening tensions.

During exercises in 2012 and 2013, and an overseas deployment to Japan, the P-8 reportedly exhibited radar, sensor integration, and data transfer problems, leading to additional testing. In January 2014, the Pentagon's Director of Operational Test and Evaluation office called the P-8A "ineffective" for large area ISR and anti-submarine warfare missions, and said that the initial aircraft were not ready for deployment. The same report found that the P-8 was effective at the small-area search mission, and with much better range, speed, and reliability than older aircraft. Pentagon acquisition undersecretary Frank Kendall disputed the report, saying that although its findings are factual, it did not acknowledge future capability upgrades for anti-submarine and wider-area surveillance.

A second squadron, VP-5, completed its transition to the P-8 in August 2013 with its next overseas deployment slated for mid-2014. A third squadron, VP-45, began its transition to the Poseidon in July 2013. During mid-2014, a pair of P-8s were dispatched to Perth, Australia for two months as part of an international search for the missing Malaysia Airlines Flight 370. USN P-8s may routinely rotate through bases of allies such as the Philippines and Thailand. In September 2014, Malaysia offered the use of bases in Borneo for P-8s, but no flights have yet been approved.

On 19 August 2014, a People's Republic of China J-11 fighter came within 30 feet of a P-8 around 135 miles east of Hainan Island. The J-11 flew past the P-8's nose and performed a barrel roll at close proximity. A Pentagon spokesperson said the J-11's unit had made close intercepts earlier that year. The U.S. sent a diplomatic note to China about the pattern of behavior by the commander of the Chinese fighter group. China stated that the claims were "totally groundless", and that the event's root was U.S. surveillance of China; the U.S. stated it will continue to operate in international airspace and waters.


In January 2008, Boeing proposed the P-8I, a customized export variant of the P-8A, for the Indian Navy. It features two major components not fitted on the P-8A, a Telephonics APS-143 OceanEye aft radar and a magnetic anomaly detector (MAD). On 4 January 2009, India's Ministry of Defence signed a US$2.1 billion agreement with Boeing for the supply of eight P-8Is to replace the Indian Navy's aging Tupolev Tu-142M maritime surveillance turboprops. Each aircraft has an average cost of about US$220 million. India was the P-8's first international customer, and was also Boeing's first military sale to India. In October 2010, India's Defence Acquisition Council approved the purchase of four additional P-8Is; this purchase is reportedly under consideration as of 2014. In 2011, India planned to order 12 more P-8Is at a later date.

The Bharat Electronics Limited (BEL) Data Link II communications allows the P-8I to exchanging tactical data between Indian Navy aircraft, ships and shore establishments. The P-8I features an integrated BEL-developed IFF system. India has purchased AGM-84L Harpoon Block II Missiles and Mk 54 All-Up-Round Lightweight Torpedoes for the P-8I. In July 2012, Boeing began flight testing of the P-8I. On 19 December 2012, the first P-8I was handed over to an Indian naval team at Boeing's Seattle facility. The Indian Navy inducted its first P-8I on 15 May 2013. The second and third P-8Is were received on 16 and 22 November 2013 respectively. The aircraft are based at INS Rajali, in Tamil Nadu. In 2014, several Indian Navy P-8Is conducted search operations for the missing Malaysia Airlines Flight 370. The fourth, fifth and sixth aircraft was delivered in May, September and November 2014 respectively. The program is on schedule to deliver two more aircraft in 2015, for a total of 8 P-8Is.

Foreign involvement and potential exports

The U.S. Department of Defense wants to follow a program template for the P-8 similar to that of the Lockheed Martin F-35 Lightning II Joint Strike Fighter (JSF) program, with international cooperation from prospective MMA users. Boeing publicly identified New Zealand as a potential customer.


On 20 July 2007, the Australian Minister for Defence announced selection of the P-8A MMA as the preferred aircraft to replace the Royal Australian Air Force fleet of Lockheed AP-3C Orions in conjunction with a yet-to-be-selected unmanned aerial vehicle. The last AP-3C is scheduled to be retired in 2018, after nearly 30 years of service. In March 2009, Australia's Chief of Air Force stated that subject to government approval, the RAAF would begin to introduce the P-8 in 2016. In October 2012, Australia formalized its participation with a commitment of A$73.9m (US$81.1m) in an agreement with the USN. In July 2013, Air Marshal Geoff Brown, head of the Royal Australian Air Force, said Australia is considering purchasing more P-8s and fewer MQ-4C Triton unmanned aircraft than earlier plans. On 21 February 2014, Prime Minister Tony Abbott announced Australia's intention to procure eight P-8s plus options for four more. Development work shall be performed in South Australia and deliveries are planned from 2017 to 2021.

In July 2014, negotiations commenced between Boeing and the Department of Defense for integration of the AGM-84 Harpoon Block 1G anti-ship missile onto the P-8A on behalf of Australia. The missile's integration is largely a matter of interfacing with the aircraft's combat system software. The Block 1G is an upgraded version of the AGM-84D Block 1C variant, giving the missile an enhanced seeker and the capability to re-attack a target. In August 2014, it was reported that the US Navy had concluded an advanced acquisition contract on the first four of up to 12 P-8As to be purchased by Australia, with delivery expected from 2017.


Italy indicated interest in purchasing MMA aircraft, with fleet support provided by Alitalia in 2004. However, in December 2008, Italy announced the purchase of four ATR 72 turboprop aircraft to replace its aging Atlantic Maritime Patrol Aircraft, possibly as a temporary solution because Italy remained interested in the P-8.


The Norwegian newspaper ''Dagbladet'' reported in March 2014 that the Norwegian Navy is looking at the possibility to lease the aircraft directly from Boeing. The Navy currently has six P-3 Orions, but is having increasing difficulty keeping them operational.

United Kingdom

In August 2012, AirForces Monthly reported that "Boeing sees the UK as a prime market for its P-8A Poseidon" following the cancellation of Nimrod MRA4. The British government has declined to comment on rumors of the UK leasing four Poseidons; the official position is that a decision will be taken in the next Strategic Defence and Security Review after the 2015 UK general election. In mid 2015 UK media sources announced that the RAF was to get a £2 billion fleet of MPA aircraft.


  •     P-8A Poseidon – Production variant for the U.S. Navy
  •     P-8I Neptune – Export variant for the Indian Navy.
  •     P-8 AGS – An Airborne Ground Surveillance variant proposed to the United States Air Force in 2010 as an alternate to upgrades to the Northrop Grumman E-8 Joint STARS fleet. Its design adds a pod-mounted, active electronically scanned array (AESA) radar on the bottom of the fuselage.

Role Anti-submarine warfare, anti-surface warfare and maritime patrol aircraft
National origin United States of America
Manufacturer Boeing Defense, Space & Security
First flight 25 April 2009
Introduction November 2013
Status In service
Primary users United States Navy
Indian Naval Air Arm
Produced 2009–present
Number built 15 as of July 2013
Program cost US$33.638 billion (by FY2013)
Unit cost US$256.5m(FY2015)
US$275.7M (with R&D, FY13)
Developed from Boeing 737 Next Generation

General characteristics

  • Crew: Flight: two; Mission: seven
  • Length: 129 ft 5 in (39.47 m)
  • Wingspan: 123 ft 6 in (37.64 m)
  • Height: 42 ft 1 in (12.83 m)
  • Empty weight: 138,300 lb (62,730 kg)
  • Useful load: 19,800+ lb (9,000+ kg)
  • Max. takeoff weight: 189,200 lb (85,820 kg)
  • Powerplant: 2 × CFM56-7B turbofan, 27,000 lbf (120 kN) each


  • Maximum speed: 490 knots (907 km/h, 564 mph)
  • Cruise speed: 440 kn (815 km/h, 509 mph)
  • Combat radius: 1,200 nmi (2,222 km) ; 4 hours on station (for anti-submarine warfare mission)
  • Service ceiling: 41,000 ft (12,496 m)


  • 5 internal and 6 external stations for AGM-84H/K SLAM-ER, AGM-84 Harpoon, Mark 54 torpedo, missiles, mines, torpedoes, bombs, and a High Altitude Anti-Submarine Warfare Weapon system


  • Raytheon APY-10 multi-mission surface search radar
  • (Advanced Airborne Sensor surface search radar and SIGINT package to be follow on system)

End notes