"Apache Longbow"
Apache Longbow Attack helicopter.
Powerplant:T700-GE-701 from General Electric
Country:USA=800 ,Egypt, Greece, Israel, the
Netherlands, Saudi Arabia, United Arab Emirates and
the United Kingdom.
"Apache Longbow Attack helicopter"
AH 64A/D Apache:
The Apache is a twin-engined army attack helicopter
developed and built by McDonnell Douglas (now
Boeing) and is in service with the US Army and has
been exported to Egypt, Greece, Israel, the
Netherlands, Saudi Arabia, United Arab Emirates and
the United Kingdom.
Programme Development:
The US Army took first delivery of the Apache in
1984. All AH- 64A Apaches are to be upgraded to
AH-64D with a more powerful engine by the year
2010. The AH-64D Longbow is fitted with the
Longbow millimetric fire control radar and the
Longbow Hellfire missile. The US Army have more
than 800 Apaches in service and more than 1000
have been exported. A consortium of GKN Westland,
McDonnell Douglas, Lockheed Martin, Westinghouse
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-64D Longbow Apache is being carried out in
the UK by GKN Westland.
The Apache was first used in combat in December
1989 in the US military action in Panama. The
Apache was used again in the Gulf War in which 15
battalions were equipped with 288 Apache
helicopters. The Apache has also supported low
intensity and peacekeeping operations world wide
including Turkey and Bosnia.
Weapon Systems :
A 30 mm automatic McDonnell Douglas M230 Chain
Gun is located under the fuselage. It provides a rate
of fire of 625 rounds per minute. The helicopter has
capacity for up to 1,200 rounds of ammunition.
missiles:
The Longbow Apache, AH-64D, is equipped with the
millimetre-wave Longbow radar from Westinghouse
and the AGM-114D Longbow Hellfire missile from
Lockheed Martin and Boeing. The Longbow fire
control radar incorporates an integrated radar
frequency interferometer for passive location and
identification of radar emitting threats. An advantage
of 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.
The Longbow Apache can effect an attack in thirty
seconds. The radar dome is unmasked for a single
radar scan and then remasked. The processors
determine the location, speed and direction of travel
of a maximum of 256 targets. Longbow Hellfire has a
millimetre wave seeker which allows the missile to
perform in full fire and forget mode. Range is 8 to 12
kilometres. The Apache has been equipped with
air-to-air missiles (Stinger, AIM-9 Sidewinder, Mistral
and Sidearm) and 2.75 inch rockets. Short Brothers
of Belfast, Northern Ireland has been contracted by
the US Army for the trial of the Starstreak missile on
the Longbow Apache helicopter, and the integration
with the Target Acquisition Designation Sight (TADS).
The Longbow Apache carries the combination of
armaments chosen for the particular mission. In the
close support role the helicopter carries 16 Hellfire
air-to-surface missiles on four 4-rail launchers and
four air-to-air missiles.
Systems:
The Longbow Apache also has an improved
reconnaissance capability. Modifications to the
design include an integrated navigation system
incorporating a global positioning system, GPS,
Doppler navigation, inertial navigation, and air
data/laser and radar altimeter navigation. A data
modem provides the interface for the secure transfer
of digital data with Joint-STARS which is the US Air
Force surveillance and target attack radar system,
and with the UH-60 Black Hawk.
Target Aquisition :
The Target Acquisition Designation Sight, TADS,
designation AN/ASQ-170, and the Pilot Night Vision
Sensor, PNVS, designation AN/AAQ-11, were
developed by Lockheed Martin. The turret-mounted
TADS provides direct view optics, television and three
fields of view forward looking infra-red (FLIR) to carry
out search, detection and recognition. The laser
rangefinder/designator integrated with the TADS was
developed by Litton Laser Systems. PNVS consists
of a FLIR in a rotating turret located on the nose of
the Apache immediately above the TADS. The image
from the PNVS is displayed in a monocular eyepiece
which is part of the Honeywell integrated Helmet And
Display Sighting System, HADDS, which is worn by
the pilot and by the copilot gunner.
Electronic Warfare :
The Apache is equipped with an electronic warfare
suite consisting of: AN/APR-39A(V) radar warning
receiver from Litton and Lockheed Martin;
AN/ALQ-144 infra-red countermeasures set from
Sanders, a Lockheed Martin company; AN/AVR-2
laser warning receiver from Hughes Danbury Optical
Systems; AN/ALQ-136(V) radar jammer developed by
ITT; and chaff dispensers.
Structure:
The Apache has been designed for high survivability
in combat. The helicopter can continue flight for a
further 30 minutes following impact by 12.7 mm
rounds directed from the ground. Some sections of
the helicopter, such as the main rotor blades, are
also tolerant to hits by 23 mm rounds. The crew
stations are fitted with Kevlar seats. The cockpits are
protected by boron armour shielding rated to provide
protection against 12.7 mm rounds. The four blades
of the main rotor can be folded or removed for
transportation, and are specified to be tolerant to 23
mm shell impact.
Engines:
The Apache is equipped with two turboshaft engines
each providing 1265 kW. The American Apache has
the type T700-GE-701 from General Electric and the
engine chosen for the UK Apache is the type
RTM322 from Rolls-Royce/Turbomeca. The engines
mounted above the fins on either side of the fuselage
are armour protected. The thermal signature of the
helicopter has been reduced by incorporating a
system of exhaust nozzles to reduce the temperature
of the gasses from the engine exhaust and the
temperature of the external metal surfaces.
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