波音737飞机B787Sink-Rate技术解释

Abaut CG SINK RATEOn the 787,CG SINK RATE is calculated from accelerometers locatedin the center electronics bay.These accelerometers are located insidethe Inertial Reference Units(IRU)and Attitude Heading Reference Units(AHRU).CG sink rate is the airplane CG sink rate in feet/min,which isused as a direct measure of the severity of the landing.CG SINK RATE is displayed on the ATA 51 Landing Conditionsmaintenance page.The CG sink rate calculation involves several parameters such as bankangle,pitch rate,etc.and is considered Boeing proprietary.Boeingregrets that this information cannot be shared outside Boeing.Theclosest match to the CG sink rate on the Landing ConditionsMaintenance Page is CPL parameter FCEVERTSPDVTDCP DCAIOBIxwhere x=1,2,3 and 4."FCEVERTSPDVTDCP DCAIOBIx where x=1,2,3 and 4"is the VotedCaptain's Vertical Speed from Flight Controls and published by Displaysand Crew Alerting function.It is the vertical velocity value displayed onthe Captain's PFD.There are four (4)different sources where thisparameter is available for redundancy purpose,thus the 1,2,3 and 4.The four different parameters (with the same value at any given time)areFCEVERTSPDVTDCP DCAIOBI1,FCEVERTSPDVTDCP DCAIOBI2,