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Naval Warfare

BNS Atlantico (A140)

Helicopter Carrier Warship [ 2018 ]

BNS Atlantico is the former HMS Ocean, sold to Brazil by the British Royal Navy to continue her ocean-going career.

Authored By: Staff Writer | Last Edited: 12/10/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

With the retirement of the ex-French Foch aircraft carrier, BNS Sao Paulo (A12), in November of 2018, the Brazilian Navy was left without an aircraft carrier and a flagship. This was remedied by the acquisition of the ex-Royal Navy HMS Ocean helicopter carrier, which became BNS Antlatico (A140) in Brazilian Navy service. The purchase was completed on February 19th, 2018 following decommissioning of HMS Ocean from the inventory of the British Royal Navy and BNS Atlantico began formal operations with the Brazilian Navy on June 29th, 2018. The warship homeports out of Arsenal de Marinha do Rio de Janeiro and carries pennant number "A140".

Atlantico is classified as a "Multi-Purpose Aircraft Carrier" but is more or less a helicopter carrier - her air wing is limited to rotary-wing types of light, medium, and attack classifications and no fixed-wing aircraft are supported. Up to eighteen helicopters can be carried about the ship, either on her flight deck or within her hangar spaces. Dimensions of the vessel include a running length of 667 feet, a beam of 115 feet, and a draught of 21 feet. The relatively shallow draught allows her to operate within striking distance of shorelines, suitable for amphibious assault support operations.

Internally, power is from 2 x Crossley Pielstick 12-cylinder diesel engines driving 2 x Shafts astern. This provides the ship with an ocean-going speed of 18 knots under ideal conditions (cruising is closer to 10 knots) with a range out to 8,000 miles.

The warship is cleared to carry up to 830 combat-ready troops along with forty military vehicles (housed on the vehicle deck) and an air wing of 180 personnel in addition to the typical 285 operating crew complement. The vessel is equipped to support ship-to-shore operations and beyond, outfitted with Type 997 "Artisan" radar, Type 1008 navigational radar, and 2 x Type 1007 Aircraft Control Radar (ACR). Electronic Warfare (EW) is handled through the UAT Electronic Support Measures (ESMs) system.

Its primary weapons scheme is largely defensive, led by 4 x 30mm DS30M Mk.2 series automatic guns in turret emplacements. Beyond this are 4 x 7.62mm minigun weapons and up to 8 x 7.62mm General Purpose Machine Guns (GPMGs). Prior to its transfer to the Brazilian Navy, the warship (as HMS Ocean) had its 3 x 20mm Phalanx Close-In Weapon Systems (CIWSs) removed.

Supported helicopter types include the Sikorsky S-70B "Seahawk" navalized helicopter, the Airbus Helicopters EC725 "Caracal" series, and the AS350 "Ecureuil" line. In British Royal Navy service, HMS Ocean also operated AH-64 "Apache" attack helicopters from her decks putting this capability within reach for the Brazilian Navy. Helicopters are operated from the flight deck via hangar elevators/lifts.

As Atlantico's entry into service has been relatively recently had, her career while sailing under the Brazilian flag has yet to be fully written.©MilitaryFactory.com
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Service Year

Brazil national flag graphic

In Active Service.

Atlantico (Ocean-class)

BNS Atlantico (A140)

National flag of Brazil Brazil
(OPERATORS list includes past, present, and future operators when applicable)
Amphibious Assault
A shallow draught, and other qualities, give this vessel the ability to support amphibious assault operations close-to-shore.
Flag Ship / Capital Ship
Serving in the fleet Flag Ship role or Capital Ship in older warship designs / terminology.

687.0 ft
209.40 m
115.0 ft
35.05 m
21.0 ft
6.40 m

Installed Power: 2 x Crossley Pielstick 12-cylinder diesel engines driving 2 x Shafts astern.
Surface Speed
18.0 kts
(20.7 mph)
6,952 nm
(8,000 mi | 12,875 km)

kts = knots | mph = miles-per-hour | nm = nautical miles | mi = miles | km = kilometers

1 kts = 1.15 mph | 1 nm = 1.15 mi | 1 nm = 1.85 km
4 x 30mm DS30M Mk.2 automatic guns.
4 x 7.62mm Miniguns.
8 x 7.62mm General Purpose Machine Guns (GPMGs).

Supported Types

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft automatic cannon
Graphical image of an aircraft Gatling-style rotating gun

(Not all weapon types may be represented in the showcase above)
Up to 18 helicopters of various makes and models including light- and medium-lift types as well as attack platforms.

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Military lapel ribbon for early warship designs
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Military lapel ribbon for the Attack on Pearl Harbor
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Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2

Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective naval campaigns / operations / periods.

Images Gallery

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Image of the BNS Atlantico (A140)
Image of HMS Ocean in action.

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