Projects

Apache Attack Helicopter (AH-64A/D)

The Apache attack helicopter was developed by McDonnell Douglas (now Boeing) for the US armed forces.

Crew

2 - pilot and co-pilot / gunner

Maiden Flight

30 September 1975

Entry into Service

1984

Manufacturer

Hughes Helicopters, McDonnell Douglas, and Boeing Integrated Defense Systems

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The Apache attack helicopter was developed by McDonnell Douglas (now Boeing) for the US armed forces. It entered service with the US Army in 1984 and has been exported to Egypt, Greece, Israel, the Netherlands, Japan, Saudi Arabia, United Arab Emirates (UAE) and the UK.

The US Army has more than 800 Apaches in service, and more than 1,000 have been exported. The Apache was first used in combat in 1989 in the US military action in Panama. It was used in Operation Desert Storm and has supported low intensity and peacekeeping operations worldwide, including in Turkey, Bosnia and Kosovo.

The first Apache Longbow was delivered in April 1997 to the US Army.

AH-64D Longbow was deployed by the US Army in Afghanistan as part of Operation Anaconda in support of Operation Iraqi Freedom and, from June 2003, in South Korea.

AH-64D Longbow is fitted with the Longbow millimetre wave fire control radar and the Longbow Hellfire missile. 501 AH-64A Apaches upgraded to AH-64D standard have been delivered to the US Army. Deliveries were completed in August 2006.

An additional 13 new-build Apaches were initially ordered, along with another 11 in November 2006. The US Army ordered 96 additional remanufactured helicopters in January 2007 and 18 new-build helicopters in April 2007.

During the same year, 30 AH-64Ds were ordered by the UAE. The first new-build AH-64D was delivered to the US Army in June 2007 and the first of the additional remanufactured helicopters in October 2007.

The US Army awarded a $247m contract to Boeing in October 2010 to start low-rate initial production (LRIP) of the AH-64D Apache Block III helicopter. Boeing will produce 51 AH-64D Apache Block III helicopters for the US Army under the LRIP contract. The first AH-64D Apache Block III helicopter was delivered to the US Army in October 2011.

International Apache orders and deliveries

The Longbow has been ordered by the Netherlands (30 deliveries complete), Singapore (20 deliveries complete, first delivered in May 2002), Israel (designated ‘Seraph’ nine new, nine remanufactured, first delivered April 2005) and Egypt (35 remanufactured, deliveries completed in January 2007).

The Royal Netherlands Air Force received its first AH-64D Apache and first Boeing AH-64D Apache Block III aircraft in May 1998 and in May 2012 respectively.

A number of AH-64A helicopters have been upgraded to AH-64D standard for South Korea. A total of 30 UAE Apache helicopters are being upgraded to AH-64D Longbow standard, and deliveries began in May 2008. In June 2006, Saudi Arabia requested the upgrade of 12 Apaches to standard and, in September 2008, the sale of 12 new AH-64Ds. In October 2008, Taiwan requested the sale of 30 AH-64D Block III Apaches.

In August 2001, the AH-64D was selected by the Japanese Ground Self-Defence Force with a requirement for 55 helicopters. The Apache for Japan is designated AH-64DJP and is armed with Stinger air-to-air missiles.

Kuwait ordered 16 AH-64D helicopters in September 2002. The first was delivered in February 2007. The Kuwaiti Apaches are equipped with BAE Systems HIDAS defensive aids system. In September 2003, Greece signed a contract for 12 (plus four options) AH-64D Longbow, also to be fitted with HIDAS. The first was delivered in January 2007.

In June 2011, Taiwan placed a $2.5bn order for 30 AH-64D Apache block III helicopters. The helicopters are scheduled to be delivered between 2013 and 2014.

AH-64A/D Apache upgrades

The first of the upgraded block II Apaches was delivered to the US Army in February 2003. Block II included upgrades to the digital communications systems of 96 A-model Apaches to improve communications within the ‘tactical internet’. In October 2007, Boeing delivered the first extended block II to the US Army.

In July 2005, the US Army awarded Boeing a development contract for block III improvements, which entered service in 2011. In December 2009, the maiden flight test of AH-64D Apache with block III structures was completed.

Block III includes increasing digitisation, the joint tactical radio system, enhanced engines and drive systems, the capability to control UAVs and new composite rotor blade. The new blades, which successfully completed flight testing in May 2004, increase the Apache’s cruise speed, climb rate and payload capability.

The block III system development and demonstration (SDD) contract was awarded to Boeing in July 2006. First flight of the Apache Block III was in July 2008. The US Army plans to upgrade all its Apache fleet to block III standard.

Science Engineering Services (SES) is a partner to Boeing in upgrading the AH-64D helicopters to the block III configuration. It will perform disassembly, inspection and repair of the AH-64D Apache helicopters.

The disassembly, inspection and repair works take place at the SES West Aviation and Integration Facility in Huntsville. The helicopters are then shipped to Boeing in Mesa, Arizona, for incorporating the AH-64D Apache block III.

In July 2012, Boeing received the first batch of ten new fuselages for block III production. The fuselages were delivered by the long-time supplier Korea Aerospace Industries (KAI).

The first AH-64E Apache built in Mesa was delivered in October 2011. In April 2016, the US Army returned 117 AH-64 D models to be remanufactured as Apache AH-64E, under a $1.5bn contract.

In March 2017, a $3.4bn multi-year agreement was signed between the US Army and Boeing for 268 AH-64E Apaches.

The AH-64E Apaches are expected to replace Apache MK1 by 2022. The upgraded version of the helicopter will feature improved sensors and avionics to deliver improved performance.

WAH-64 Longbow Apache

A consortium of GKN Westland (now AgustaWestland), Boeing, Lockheed Martin, Northrop Grumman and Shorts bid a version of the Longbow Apache for the UK Army attack helicopter requirement which was selected in July 1995. Assembly of the WAH-64 Longbow Apache was carried out in the UK by AgustaWestland.

The first helicopter entered service in January 2001 designated as the AH mk1. A total of 67 helicopters have been delivered, with the last being formally handed over at the Farnborough Air Show in July 2004.

The initial operating capability was achieved in October 2004 and, in May 2005, the first of three Army Air Corps regiments of 18 helicopters was declared fully operational. The other two regiments are expected were fully operational by 2010. The AH mk1 helicopter has also been operated successfully on HMS Ocean helicopter carrier and, in November 2006, made a first landing on the Invincible Class aircraft carrier, HMS Ark Royal.

Boeing AH-64 Apache weapons

A 30mm automatic Boeing M230 chain gun is located under the fuselage. It provides a rate of fire of 625 rounds a minute. The helicopter has capacity for up to 1,200 rounds of ammunition.

AH-64D is armed with the Lockheed Martin / Boeing AGM-114D Longbow Hellfire air-to-surface missile, which has a millimetre wave seeker that allows the missile to perform in full fire and forget mode. Its range is 8km to 12km.

The Apache attack helicopter can be equipped with air-to-air missiles (Stinger, AIM-9 Sidewinder, Mistral and Sidearm) and the advanced precision kill weapon system (APKWS), formerly known as Hydra, family of guided and unguided 70mm rockets. Plans to arm the Apache with the advanced precision kill weapon system (APKWS) II, a laser-guided version of the Hydra, were shelved in the FY2008 budget. The US Army awarded BAE Systems a development contract for the APKWS II in April 2006.

British Army AH mk1 helicopters are armed with the CRV7 70mm rocket system from Bristol Aerospace of Winnipeg, Manitoba.

The Longbow Apache carries the combination of armaments chosen for the particular mission. In the close support role, the helicopter carries 16 Hellfire missiles on four four-rail launchers and four air-to-air missiles.

Sensors of Apache attack helicopter

AH-64D Longbow Apache is equipped with the Northrop Grumman millimetre-wave Longbow radar. The Longbow fire control radar incorporates an integrated radar frequency interferometer for passive location and identification of radar-emitting threats. An advantage of the millimetre wave is that it performs under poor visibility conditions and is less sensitive to ground clutter. The short wavelength allows a very narrow beamwidth, which is resistant to countermeasures.

Longbow Apache can conduct an attack in 30 seconds. The radar dome is unmasked for a single radar scan and then remasked. Processors determine the location, speed and direction of travel of a maximum of 256 targets.

The target acquisition designation sight, TADS (AN/ASQ-170), and the pilot night vision sensor, PNVS (AN/AAQ-11), were developed by Lockheed Martin. The turret-mounted TADS provides direct-view optics, television and three-fields-of-view forward-looking infrared (FLIR) to carry out search, detection and recognition, and Litton laser rangefinder / designator. PNVS consists of a FLIR in a rotating turret located on the nose above the TADS. The image from the PNVS is displayed in the monocular eyepiece of the Honeywell integrated helmet and display sighting system (IHADSS), worn by the pilot and copilot / gunner.

Lockheed Martin has developed a new targeting and night vision system for the AH-64 Apache, using second-generation long-wave infrared sensors with improved range and resolution. The new system is called Arrowhead and has a targeting FLIR with three fields of view, a dual field-of-view pilotage FLIR, a CCD TV camera, electronic zoom, target tracker and auto-boresight.

Arrowhead entered production in December 2003 and the first unit was delivered to the US Army in May 2005. The first Arrowhead system was integrated to the Apache helicopter in June 2005. The 500th delivery was made in 2008 and the remaining deliveries were completed as scheduled. The US Army has also placed follow-on contracts for additional Arrowhead fittings to its Apache attack helicopter fleet, increasing the total number of Arrowhead integrations for the US Army.

A contract to equip the UK AH Mk1 helicopters with Arrowhead was placed in May 2005. The first two were delivered in November 2008 and deliveries concluded in 2010.

Apache AH-64A/D countermeasures

The Apache attack helicopter is equipped with an electronic warfare suite consisting of: AN/APR-39A(V) radar warning receiver from Northrop Grumman (formerly Litton) and Lockheed Martin; Lockheed Martin AN/APR-48A Radar Frequency Interferometer Electronic Support target acquisition system; AN/ALQ-144 infra-red countermeasures set from BAE Systems IEWS (formerly Sanders, a Lockheed Martin company); AN/AVR-2 laser warning receiver from Goodrich (formerly Hughes Danbury Optical Systems then Raytheon); AN/ALQ-136(V) radar jammer developed by ITT; and chaff dispensers.

US Army AH-64D Apache Longbow helicopters were to be fitted with the ITT AN/ALQ-211 SIRCM (suite of integrated radio frequency countermeasures) suite. However, the availability of funding for this project is uncertain.

UK AH mk1 Apaches are fitted with BAE Systems helicopter integrated defensive aids suite (HIDAS), also chosen by Kuwait and Greece. HIDAS, which includes the Sky Guardian 2000 radar warning receiver, entered service on the AH mk1 in July 2003.

Israeli AH-64D helicopters are fitted with the Elisra Seraph self-protection system, including SPS-65 missile warner and SPJ-40 radar jammer.

Dutch AH-64D helicopters are fitted with the Northrop Grumman directional infrared countermeasures (DIRCM) pod.

Apache attack helicopter engines

The Apache attack helicopter is equipped with two turboshaft engines, each providing 1,265kW. The American AH-64D has General Electric T700-GE-701 engines and the UK Apache is fitted with RTM322 engines from Rolls-Royce / Turbomeca.

AH-64 Apache performance

The Boeing AH-64 Apache can climb at a rate of 889m/min. The maximum and cruise speeds of the helicopter are 279km/h and 260km/h, respectively. The ferry range and service ceiling of the helicopter are 1,900km and 6,400m respectively. The endurance is three hours and nine minutes. The helicopter weighs around 5,165kg, while the maximum take-off weight is 10,433kg.

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