The Cessna 550 Citation II is a twin-engined corporate jet aircraft produced by the US-American manufacturer Cessna Aircraft Company. The Cessna Citation II is a stretched development of the Cessna 500 Citation I (+1,29m / 4ft 3in). The Cessna 550 Ciation II flew first on 31 January 1977. The aircraft accomodate two crew and up to twelve passengers and is powered by two Pratt & Whitney Canada JT15D-4 engines. The ICAO code for this business jet is C550. When production ended a total of 667 were manufactured.

On 12 March 1993, the 1992-built Cessna 550 Citation II s/n 550-0378 (ex (PH-LNR/PH-NLY/PH-SLV), N12030) was registered PH-LAB with Stichting Nationaal Lucht- en Ruimtevaartlaboratorium, Amsterdam. On 26 March 2014, the registered ownership changed to Stichting Laboratoriumvliegtuig NLR/TU Delft, Amsterdam.
On 16 June 2022, Cessna 550 Citation II PH-LAB 'Prof. Ir. H.J. van der Maas' was seen at Groningen Airport Eelde with TUDelft logo and TUDelft / Delft University of Technology titles.

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