班级练习分析和总结.docx

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Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwithagun,butthemanwiththeportablecomputerinbusinessclass.Inthelast15years,pilotshavereportedwellover100incidentsthatcouldhavebeencausedbyelectromagneticinterference.Thesourceofthisinterferenceremainsunconfirmed,butincreasingly,expertsarepointingtheblameatportableelectronicdevicessuchasportablecomputers,radioandcassetteplayersandmobiletelephones.

RTCA,anorganizationwhichadvisestheaviation(航空)industry,has

recommendedthatallairlinesban(禁止)suchdevicesfrombeingusedduringcriticalstagesofflight,particularlytake-offandlanding.Someexpertshavegonefurther,callingforatotalbanduringallflights.Currently,rulesonusingthesedevicesareleftuptoindividualairlines.Andalthoughsomeairlinesprohibitpassengersfromusingsuchequipmentduringtake-offandlanding,mostarereluctanttoenforceatotalban,giventhatmanypassengerswanttoworkduringflights.

Thedifficultyispredictinghowelectromagneticfieldsmightaffectanaircraftscomputers.Expertsknowthatportabledevicesemitradiationwhichaffectsthosewavelengthswhichaircraftusefornavigationandcommunication.But,becausetheyhavenotbeenabletoreproducetheseeffectsinalaboratory,theyhavenowayofknowingwhethertheinterferencemightbedangerousornot.

Thefactthataircraftmaybevulnerable(易受损的)tointerferenceraisesthe

riskthatterroristsmayuseradiosystemsinordertodamagenavigationequipment.Asworrying,though,isthepassengerwhocantheartheinstructionstoturnoffhisradiobecausethemusicstooloud.

Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwithagun,butthemanwiththe(1) computerinbusinessclass.Inthelast15years,pilotshavereportedwellover100(2) thatcouldhavebeencausedbyelectromagneticinterference.Thesourceofthisinterferenc

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