Mad Dog BLAST OFF!⠀ ⠀ The Pratt & Whitney JT8D-200 series engines of the MD-80 family were developed specifically for the aircraft as a significant upgrade to the JT8D engine product line that had been in production since 1964 for the 727, DC-9, and 737-100/200 families. ⠀ ⠀ Compared to the IAE V2500 engine of the MD-90 and the Rolls Royce BR715 of the MD-95/717, the Pratt & Whitney JT8D-200 of the MD-80 is one loud beast from a different era. ⠀ ⠀ Compared to the first generation of JT8D engines used on the 727, DC-9 and 737-100/200 variant families, the engine was upgraded significantly for the JT8D-200 series used on the MD-80, the most obvious change being an increase in the fan diameter from 1.01m to 1.27m which increased its bypass ratio and made it relatively quieter and more fuel efficient than the earlier versions but not as quiet as the current generation of commercial turbofan engines. ⠀ ⠀ There are three basic versions to the JT8D-200 family- the -209 powered the earliest MD-80s off the production line. The -209 was a bit of a pig and was quickly supplanted by the more powerful -217 and even more powerful -219. The -209 could be converted into a -217 and most were; this required a new air-cooled HP turbine and a modified LP turbine that has aerodynamic tweaks. There is a -217 subvariant, the -217C, that’s just a derated -219 but otherwise identical to the -219.⠀ ⠀ I took this photo of N471AA back in 2015. She was retired to Roswell in April 2016. ⠀ ⠀ #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #dfwavgeek #airport #planespotting #airlines #McDonnellDougas #MD80 #American #AmericanAirlines #N471AA #instagramaviation #splendid_transport #instaaviation #aviationlovers #aviationphotography #flight #AvGeeksAero #AvgeekSchoolofKnowledge #AvGeekNation #TeamAvGeek #MD80Sunset (at DFW Airport) https://www.instagram.com/p/B5aPVctB-El/?igshid=qegycolz6pap