F 117    nighthawk
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F 117    nighthawk F 117 nighthawk Document Transcript

  • F-117 NighthawkF-117 Nighthawk F-117 Nighthawk
  • The Lockheed F-117A Nighthawk, nicknamed "The Black Jet", is the worlds firstoperational aircraft completely designed around stealth technology. Flown only bythe United States Air Force, it is a direct descendant of the Have Blue stealthprototype program.The F-117A was widely publicized during the Gulf War. The Air Force has beentrying to retire the F-117, due mainly to the deployment of the more effective F-22Raptor. The Air Force is planning to retire the F-117 from October 2006 over thenext several years, and no new pilots will be trained to fly the plane.
  • DesignationThe "F-" designation for this aircraft has not been officially explained; however, itseemed to use the pre-1962 USAF fighter sequence like the F-111. Other modernaircraft also have old pre-1962 numbers (such as the B-52, C-130, and a number oflesser known aircraft), but the F-117 seems to be the only later aircraft not to use thenew system. Most modern U.S. military aircraft use post-1962 designations whichfollow (somewhat) predictable pattern whereby "F-" was usually an air-to-air fighter,"B-" was usually a bomber, and "A-" was usually a ground-attack aircraft. Examplesof the foregoing include the F-15 Eagle, the B-2 Spirit and the A-6 Intruder. Still,since the Stealth Fighter is actually primarily a ground-attack plane, the fact that itretains an "F-" designation is one of the reasons there are several other theories. TheUSAF has always been more proud of its fighters than its ground-attack aircraft,which are sometimes denigrated as "mud movers." Officials may have felt that theycould more easily generate political and military support for the radical new aircraft ifit were called a "fighter" rather than a bomber or attack plane. Or, the "F-" designationmay have been part of the attempt to keep the Nighthawk secret (the program wasclassified until the late 1980s). This misdirection could have also served to keep theNighthawk from violating treaties or angering other countries. During developmentthe term LT, for Logistics Trainer, was often used. The Lockheed U-2 should havehad "R" for reconnissance instead of a "U" for utility, but, was purposely given thewrong letter to cover its true mission.Also, a recent televised documentary quoted a senior member of the F-117Adevelopment team as saying that the top-notch fighter pilots required to fly the newaircraft were more easily attracted to an F- plane, as opposed to a B- or A- aircraft.There has been something of a class distinction between fighter and bomber crews,particularly in the days of the Strategic Air Command (1945-1991), and flying onetype often limited a pilots prospects for flying the other.The USAF maintains that the F-117A can carry air-to-air missiles, giving it air-to-aircombat capability in addition to its primary air-to-ground mission. While that may betechnically true, the aircraft is of unknown capability in air-combat. It is likely a poordogfighter, but there is no expert opinion on its other abilities.There is some conjecture about its abilities. It is said that it cannot turn at greater than5 g, though the information is classified. It lacks the radar to guide longer-rangemissiles, and does not carry shorter-range ones for self-defense. Either radar or ahelmet mounted sight system is normally used for initial targeting of a short rangeinfra-red guided missile. The lack of radar makes the use of any sort of AAMunlikely. USAF officials once considered putting AIM-9 Sidewinder air-to-airmissiles on the F-117 � pilots were even trained to fire them � but there is noevidence that AIM-9s have ever been loaded aboard. Its stealth capabilities makes ithard to locate by other fighters and target with radar tracking air-air missiles.Design and operationAbout the size of an F-15C Eagle, the single-seat, twin-engine F-117A is powered bytwo non-afterburning General Electric F404 turbofan engines, and has quadruple-redundant fly-by-wire flight controls. It is air refuelable. In order to lower
  • development costs, the avionics, fly-by-wire systems, and other parts are derived fromthe F-16 Fighting Falcon, F/A-18 Hornet and F-15E Strike Eagle. The parts wereoriginally described as spares on budgets for these aircraft, to keep the F-117 projectsecret.Among the penalties for stealth are 30% lower engine power, a very low wing aspectratio, and a high sweep angle needed to deflect incoming radar waves to the sides.The F-117A is equipped with sophisticated navigation and attack systems integratedinto a digital avionics suite. It carries no radar, which lowers emissions and cross-section. It navigates primarily by GPS and high-accuracy inertial navigation. Missionsare coordinated by an automated planning system that can automatically perform allaspects of a strike mission, including weapons release. Targets are acquired by athermal imaging infrared system, slaved to a laser that finds the range and designatestargets for laser-guided bombs.The F-117As split internal bay can carry 5,000 lb (2,300 kg) of ordnance. Typicalweapons are a pair of GBU-10, GBU-12, or GBU-27 laser-guided bombs, twoBLU-109 penetration bombs, two Wind- Corrected Munition Dispensers (WCMD), ortwo Joint Direct Attack Munitions (JDAMs), a GPS/INS guided stand-off bomb. Itcan theoretically carry two examples of nearly any weapon in the USAF inventory,including the B61 nuclear bomb. There are a number of bombs that it cannot carry,either because they are too large to fit in its bomb bay, or are incompatible with theF-117s carry system.HistoryThe decision to produce the F-117A was made in 1973, and a contract awarded toLockheed Advanced Development Projects, popularly known as the "Skunk Works,"in Burbank, California. The program was led by Ben Rich. The first flight was in1977, only 31 months after the full-scale development decision. The first F-117A wasdelivered in 1982, operational capability was achieved in October 1983, and the lastdelivery was in the summer of 1990. The Air Force denied the existence of the aircraftuntil 1988, then in April 1990 an example was put on public display at Nellis AirForce Base, Nevada, attracting tens of thousands of spectators.Current inventory is 54 airplanes; 36 of those are combat-ready, the rest are fortraining, etc.During the programs early years, from 1984 to mid-1992, the F-117A fleet was basedat Tonopah Test Range, Nevada where it served under the 4450th Tactical Group. The4450th was absorbed by the 37th Tactical Fighter Wing in 1989. In 1992, the entirefleet was transferred to Holloman Air Force Base, New Mexico, where it was placedunder the command of the 49th Fighter Wing. The move eliminated the need for KeyAir flights, which flew 22,000 passenger trips on 300 flights from Nellis to Tonopahper month.As the Air Force has stated, "Streamlined management by Aeronautical SystemsCenter, Wright-Patterson AFB, Ohio, combined breakthrough stealth technology withconcurrent development and production to rapidly field the aircraft... The F-117Aprogram demonstrates that a stealth aircraft can be designed for reliability andmaintainability." The aircraft maintenance statistics are comparable to other tacticalfighters of similar complexity. Logistically supported by Sacramento Air LogisticsCenter, McClellan AFB, California, the F-117A is kept at the forefront of technologythrough a planned weapon system improvement program located at USAF Plant 42 atPalmdale, California.
  • CombatThe F-117 has been used several times in war. Its first mission was during the UnitedStates invasion of Panama in 1989. During that invasion two F-117A Nighthawksdropped two bombs on Rio Hato airfield. Later, during the Gulf War, it performedwell by dropping smart bombs on Iraqi military targets. It has since been used in theKosovo War in 1999, the Operation Enduring Freedom and in the 2003 invasion ofIraq.Combat lossesOne F-117 has been lost in combat, to Serbian/Yugoslav forces. On March 27, 1999,during the Kosovo War, the 3rd Battalion of the 250th Missile Brigade under thecommand of Colonel Zolt�n Dani, equipped with the Isayev S-125 Neva-M (NATOdesignation SA-3 Goa), downed F-117A serial number 82-806 with a Neva-Mmissile. According to NATO Commander Wesley Clark and other NATO generals,Yugoslav air defenses found that they could detect F-117s with their "obsolete" Sovietradars operating on long wavelengths. This, combined with the loss of stealth whenthe jets got wet or opened their bomb bays, made them visible on radar screens. Thepilot survived and was later rescued by NATO forces. However, the wreckage of theF-117 was not promptly bombed, and the Serbs are believed to have invited Russianpersonnel to inspect the remains, inevitably compromising the US stealth technology.The SAMs were most likely guided manually with the help of thermal imagers andlaser rangefinders included in the Pechora-M variant of the SA-3s believed to havebeen used. Reportedly several SA-3s were launched, one of which detonated in closepromixity to the F-117A, forcing the pilot to eject. According to an interview, Zolt�nDani was able to keep most of his missile sites intact and had a number of spottersspread out looking for F-117s and other aircraft. Zolt�n and his missile crewsguessed the flight paths of earlier F-117As from occasional visual and radar spottingsand judging from this information and what target had just been bombed, Zolt�n andhis missile battery determined the probable flight path of F-117A #82-806. Hismissile crews and spotters were then able to locate it and fire their missiles. Zolt�nalso claims to have modified his radars to better detect the F-117A, but he has notdisclosed what was changed. Parts of the shot-down aircraft are now presented to thepublic in the Museum of Yugoslav Aviation in Belgrade.Some sources claim a second F-117A was also damaged during a raid in the KosovoWar, and although it made it back to its base, it never flew again.FutureWith its successes in the Kosovo and Iraq Wars and its high mission-capable rate, theF-117 has secured its place as the aerospace "tip of the spear" -- serving to blind theenemy by destroying command, control and radar early in the campaign. However theF-117 is nonetheless designed with late 1970s technologies. Its stealth technology,while still more advanced than that of any other aircraft but the B-2 Spirit and F-22A,is maintenance heavy. Furthermore, the facet-based stealth design (which hasaerodynamic cost) represents an old counter-radar technique that has since beengreatly refined. Consequently there has been a preliminary decision to retire the fleetin 2008.
  • The increase of production of the F-22A by four planes and its entry as an operationalaircraft into the US Air Force has created debate about retiring the F-117 fleet. A draftversion of the 2006 Quadrennial Defense Review and the 2007 Defense Budget thatwere leaked proposed retiring the entire fleet to make room for buying more F-22As.This plan was removed from both the final 2007 Budget and the final QDR.Critics say that efforts to retire the F-117 (a single-purpose ground attack plane), isinfluenced by the largely former-fighter pilots that populate the highest ranks of theAir Force. Furthermore, critics contend that the F-117A Nighthawk is able to carryfive thousand pounds of ordnance in its internal bay (even including a B61 nuclearbomb) and remain stealthy, whereas the F-22A is only able to carry two thousandpounds of ordnance in its internal bays and can only carry larger bombs on its externalpylons, thereby compromising its stealth and maneuverability.Supporters of the proposal, however, argue that the high maintenance costs and olderstealth technology that is vulnerable to long-wavelength radar, combined with asubsonic speed limit, makes the F-117 more dangerous to fly. They contend that theF-22A is the logical successor considering that:  Its stealth is nearly as advanced as the B-2s, and reportedly more effective than the F-117s.  It can fly at supersonic speeds without using afterburners and thus can reach targets and transit high-threat area faster.  Its radar-absorbing material requires far less maintenance than that of the F-117.  The new 250 lb small diameter bomb (SDB) has entered service. It is designed specifically to fit in the F-22As internal munitions bays, and provides the same penetrating power as a larger 2000 lb BLU-109 bomb.  The F-22 has more advanced avionics than the F-117, providing better situational awareness of possible ground or air threats.  As the F-22 is a fighter aircraft, it is able to self escort on many of its strike missions.Although the proposal of the retirement of the F-117 fleet was withdrawn, the AirForce has closed the F-117 pilot school, and has announced the retirement of theF-117. This puts the F-117s future in doubt.Interestingly, several of the F-117s were painted in a grey camouflage pattern in anexperiment to determine the effectiveness of the F-117s stealth during daylightconditions. If the experiment is successful, it might lead to part or all of the fleetchanging from their trademark black to this new color scheme, enabling, for the firsttime, daylight operations in warzones. As of early 2006 the outcome of thisexperiment is unknown. Also, 2004 and 2005 saw several mid-life improvementprograms being implemented on the F-117, including an avionics upgrade.Operators  USAFGeneral characteristics
  •  Crew: 1  Unit Cost: $45 million  Length: 63 ft 9 in (20.08 m)  Wingspan: 43 ft 4 in (13.20 m)  Height: 12 ft 9.5 in (3.78 m)  Wing area: 780 ft� (73 m�)  Empty weight: 29,500 lb (13,380 kg)  Loaded weight: 52,500 lb (23,814 kg)  Powerplant: 2� General Electric F404-F1D2 turbofans, 10,600 lbf (48.0 kN)  Inventory: Active force - 55Performance  Maximum speed: High Subsonic (1,130 km/h)  Range: 535 miles (860 km)  Service ceiling: 33,000 ft (10,000 m)  Thrust/weight: 0.40Armament  2 x internal weapons bays with one hardpoint each (total of 2 weapons) including:  Bombs: BLU-109 hardened penetrator, GBU-10 Paveway II laser- guided, GBU-27 laser-guided  Missiles: AGM-65 Maverick air-to-surface, AGM-88 HARM air-to- surface