Cessna Citation
In 1968, long time piston aircraft manufacturer Cessna  decided to produce an executive jet under the name ' Fanjet 500'.  A prototype first flew in September 1969, when the project was re-named 'Citation', starting a family of aircraft that has become the biggest and most prevalent of all the executive jets, in fact almost 3000 of all models have now been produced.  All aircraft are built at Wichita-Mid Continent Airport, Kansas.
Cessna Unit numbers were initially allocated on top of the C500, C501, 550 and 551 construction numbers which leads to a certain amount of confusion, although later on the two coincide.  Web Site:  http://www.cessna.textron.com/home.html

C550
C550B
S550
C551
C552/T47A

C500 Citation 1
Powered by Pratt & Whitney JT15D-1 turbofans, the 500 prototype first flew on 15th September 1969 and around 400 were subsequently built.  It has a range up to 1,400 miles with six passengers.


C500 Citation Eagle
http://www.sijet.com/
 A small number of Citation I's have been upgraded by Sierra industries of Uvalde, Texas.  Known as the Citation Eagle, it consists of a wing modification to give improvements in range, field length, climb and other areas. The Sierra Industries web site is at 










C501 Citation I/SP
This upgraded version of the 500 first flew in 1976.  It has uprated P&W JT15D-1A engines plus a 7ft larger wing span but is otherwise externally similar to the 500. Around 320 C501's were built. A single pilot version is known as the Citation 1/SP.
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C501 Citation Eagle 2
http://www.sijet.com/
 This is an upgraded Citation 501, designed by Sierra Industries of Uvalde, Texas.  The aircraft is re-engined with Williams-Rolls FJ44-2A Turbofans which give lower fuel consumption, better hot and high performance, a speed increase of 50kt and range increase of 300nm over the previous Pratt & Whitney engines.  The Sierra Industries web site is at 
Citation Stallion

http://www.sijet.com/
 This is an upgraded Citation 500/501SP, designed by Sierra Industries of Uvalde, Texas.  The aircraft is re-engined with Williams-Rolls FJ44-2A Turbofans.  It first flew on 14th June 2006 and has a shorter range than the Eagle 2.  The maximum ceiling increases to 43,000ft, also giving over 30kt increase in speed.  Conversion takes about 10 weeks and costs around 1.6 million dollars. 
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C525 Citationjet
Designed to replace the 500/501 as Cessna's entry level executive jet, the C525 is powered by Rolls Royce/Williams FJ44 turbofans giving a maximum cruising speed of 440mph.  The aircraft can accommodate up to five passengers and a single pilot.  It first flew on 29th April 1991 and is slightly smaller than the earlier 500 although internal area is greater.  It has a range of up to 1,727 miles and over 400 had been produced by late 2000. The most obvious difference from the aircraft it replaces is the T-tail.
C525 Citationjet CJI
This is an updated version of the C525 Citationjet, replacing the former on the production line and deliveries began in mid 2000. Improvements include a higher MTOW and improved avionics.  Production ceased at c/n 558 when it was superseded by the CJ1+.
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C525 Citationjet CJI+
Certification of the CJ1 successor was granted on 17th June 2005, the aircraft having first flown on 8th October 2004.  It is powered by two Williams’ FJ44-1AP engines giving a greater speed, a range  of 1,285 nm and better payload than the CJ1.  Avionics are upgraded to those of the CJ2+ and CJ3.  Deliveries started in late 2005 with construction numbers staring at no. 600.
C525A Citationjet CJ2
This stretched version of the Citationjet is powered by two FJ44-2C engines giving speeds up to 460mph with a range of 1600nm.  Six passengers are accommodated in a cabin which is just over three feet longer than the C525.  Avionics are identical to the CJ1. First flight took place on 27 April 1999 with certification achieved in June 2000. Over 360 had been built by mid 2007.
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C525A Citationjet CJ2+
The successor to the Citationjet CJ2, the CJ2+ was announced at the NBAA show in 2004 and made its first flight on 4th April 2005.  Improvements include the addition of Williams' FJ44-3A-24 engines giving increased performance, plus updated avionics. Certification was attained in October 2005 with deliveries beginning in mid 2006.
C525B Citationjet CJ3
Announced at the NBAA show 2002, the CJ3 is a stretched version of the CJ2, with a 2ft longer passenger cabin and powered by uprated Williams FJ44-3A turbofans and enhanced avionics.  It has a 0.53m longer wing span, 0.3m higher vertical tail and a range of 3080km with a maximum cruise speed of 417kt.  First flight was made on 17th April 2003. Type certification was achieved on 18th October 2004, with first customer deliveries following soon after. Over 160 had been built by mid 2007.
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C525 Citationjet CJ4

First flight of the latest version of the Citationjet took place on 5th April 2008 with deliveries planned to start start two years later.  Powered by the Williams FJ44-4A which gives extra thrust compared to the CJ3, thus greater speed, payload, range and better economics.  Carrying up to eight passengers in cabin that is 0.5m longer than the CJ3, the CJ4 features a 'moderately' swept wing giving good short field performance. Range is 1,825nm.
Citation 510 Mustang
Announced at the NBAA show 2002, the Mustang is a 6 seat personal jet aimed at owner flown operators of piston twins and turboprops, in competition with other jets such as the Eclipse.  Cruise speed is 340kt with a range of 1300nm off a runway of 950m. Powered by two P&WC PW615F's,  It is slightly smaller overall than the CJ1 but has a new straight wing design.  Introductory price was $2.3 million, with almost 200 orders claimed in the first 48 hours!.  Cost later increased to 2.6m dollars.  First flight took place on 23rd April 2005, certification was achieved on 8th September 2006 with the first aircraft being delivered in late April 2007.  Over 500 orders were claimed in mid 2008.
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