Oversight Hearing on Noise Control Act: Hearing Before the Subcommittee on Aviation of the Committee on Commerce, United States Senate, Ninety-third Congress, First Session ...U.S. Government Printing Office, 1973 - 183 pages |
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Page 146
... inlet and dis- charge ducts with surfaces which were acoustically absorbent . This suppression technique is often referred to as SAM ( sound absorbent material ) . Noise reductions as high as 10 to 15 EPNdB were obtained under approach ...
... inlet and dis- charge ducts with surfaces which were acoustically absorbent . This suppression technique is often referred to as SAM ( sound absorbent material ) . Noise reductions as high as 10 to 15 EPNdB were obtained under approach ...
Page 158
... INLETS HOT ENGINE AIR JET ONLY Figure 5. -. A January 1972 paper ( 1 ) summarized 15 years of activity by The Boeing ... INLET TREATMENT P & WA BG - 19 ENGINE TREATMENT 2 3 RANGE , 1000 NMI 5 Figure 2. - Payload - Range Comparison of the ...
... INLETS HOT ENGINE AIR JET ONLY Figure 5. -. A January 1972 paper ( 1 ) summarized 15 years of activity by The Boeing ... INLET TREATMENT P & WA BG - 19 ENGINE TREATMENT 2 3 RANGE , 1000 NMI 5 Figure 2. - Payload - Range Comparison of the ...
Page 159
... inlet to suppress forward - radiated fan noise , and fan duct treatment to reduce aft - radiated fan noise . The ... INLET DOOR S ENGINE AIR INLET CRUISE MODE SECONDARY INLETS CLOSED IN CRUISE CURRENT TWO - STAGE FAN JT8D PRODUCTION ...
... inlet to suppress forward - radiated fan noise , and fan duct treatment to reduce aft - radiated fan noise . The ... INLET DOOR S ENGINE AIR INLET CRUISE MODE SECONDARY INLETS CLOSED IN CRUISE CURRENT TWO - STAGE FAN JT8D PRODUCTION ...
Page 164
... inlet that can be easily modified to the treated configuration . Retrofit kits for quieting the current 737 fleet could be delivered in approximately 15 months from the date of order . Figure 20 includes a summary of the noise levels ...
... inlet that can be easily modified to the treated configuration . Retrofit kits for quieting the current 737 fleet could be delivered in approximately 15 months from the date of order . Figure 20 includes a summary of the noise levels ...
Page 165
... inlet acoustic - geometric relationships , inlet splitters have been tested . A complete assessment of performance , weight , and other installation penalties has not yet been accomplished ; preliminary results indicate that the penal ...
... inlet acoustic - geometric relationships , inlet splitters have been tested . A complete assessment of performance , weight , and other installation penalties has not yet been accomplished ; preliminary results indicate that the penal ...
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acoustically action Administrator air transportation aircraft noise airlines airplane airport noise airport operators Angeles International Airport approach Boeing California carriers certified Chairman commerce committee Congress consultation cost Court criteria decibels Department of Airports effective Environmental EPNdB FAA's FADEM Federal Aviation Federal Aviation Administration Figure fleet noise level flight test Front Fan funds going health and welfare hearing Highline School District industry Inglewood inlet installation jet aircraft jet noise JT3D JT8D JT8D engines legislation Mayor MERGELL meet MEYER million MITCHELTREE MOORE NASA noise abatement Noise Control Act noise emission noise pollution noise problem noise reduction noise regulations noise standards noise suppression port procedures QUIET NACELLE quieter refanned requirements runway RUSSELL Senator CANNON Senator TUNNEY SKULLY splitter Stat statement subsection takeoff Task Group Thank tion Treated Nacelle Washington zoning