1981 McDONNEL DOUGLAS 500D. Beautiful Helicopter with New mini turbine and great component times remaining (always USA). Call for specs. Airframe: 1981 Hughes/MD 500D Serial Number: 811051D N Number: N5074L (tape not painted N numbers) TTAF: 21272 Engines: Component Times Remaining (detailed sheet on request): Mini Turbine: 1551.5 hrs Compressor: 1564.3 hrs M/R Blades: 3116.5 hrs T/R ......more.