Date: 05 Dec 96 02:27:20 From: email@example.com (nkjjb ) Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA References: 1
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Jeff To answer both posts Turnaround Maintenence Usally Include Thru-Flight Inspection. This involves Checking the Fluids- Hydrulic, Engine oils, Fuel (a refuel base on next destination and payload, You don't just top it off It would cost money to fly the extra fuel around). Inspect the engine intakes and first stage Compressor blades for impact damage. Check the landing gear tires and brakes ( in case the landing was hard and damaged anything. Flaps and Slats(leading edge flaps) for proper deployment and security (not falling off) . A general "Walk Around" is performed Looking for visable damage. Most of these Tasks can be performed while the passengers are exiting and the cabin is being restocked. The sound you here as the jet approaches is the harmonic vibration of the compressor blades spinning, much like an electric fan produces its own tone while spinning (much lower frequency and volume). As the jet passing you here the engine thrust. This is produced from the combustion of the compressed fuel -air mixture igniting in the cumbustion chamber passing thru the turbine blade and exiting the exhust nozzle. during take-off and climb to altitude you might notice a sharper crackle or popping of the exhust sound, this is caused by the fact that the exhust gases are leaving the engine at super-sonic speeds and the miniture sonic booms produce by these exhust gases -- NASA/Goddard Space Flight Center The opinions expressed in the article above are not necessarily those of NASA or any of its contractors. The poster is respon- sible for the accuracy of the statements above.