The retrofit of JT8D-109 (refan) engines are evaluated on a 727-200 airplane in terms of airworthiness, performance, and noise. Design of certifiable hardware, manufacture, and ground testing of the essential nacelle components is included along with analysis of the certifiable airplane design to ensure airworthiness compliance and to predict the in-flight performance and noise characteristics of the modified airplane. The analyses confirm that the 727 refan airplane is certifiable. The refan airplane range would be 15% less that of the baseline airplane and block fuel would be increased by 1.5% to 3%. However, with this particular 727-200 model, with a brake release gross weight of 172,500 lb (78,245 kg), it is possible to operate the airplane (with minor structural modifications) at higher gross weights and increase the range up to 15% over the 727-200 (baseline) airplane. The refan airplane FAR Part 36 noise levels would be 6 to 8 EPNdB (effective perceived noise in decibels) below the baseline. Noise footprint studies showed that approach noise contour areas are small compared to takeoff areas. The 727 refan realizes a 68% to 83% reduction in annoyance-weighted area when compared to the 727-200 over a range of gross weights and operational procedures. (Author)
Phase 2 Program on Ground Test of Refanned JT8D Turbofan Engines and Nacelles for the 727 Airplane. Volume 4: Airplane Evaluation and Analysis
1975
323 pages
Report
No indication
English
Jet & Gas Turbine Engines , Air Transportation , Aircraft performance , Boeing 727 aircraft , Ground tests , Turbofan engines , Aircraft design , Exhaust systems , Intake systems , Noise reduction , Propulsion system performance , Structural design , Commercial aircraft , JT-8 engines , JT-8D engines