31 July 2011 C1 CIVIL AVIATION DEPARTMENT HONG KONG ...

together necessary to provide thrust, independently of the continued operation ofany other power-unit(s), but not including short period thrust-producing devices.Pressure-altitude. An atmospheric pressure expressed in terms of altitudewhich corresponds to that pressure in the Standard Atmosphere.Required Communication Performance (RCP). A statement of theperformance requirements for operational communication in support of specificATM functions.Required Communication Performance Type (RCP Type). A label (e.g. RCP240) that represents the values assigned to RCP parameters for communicationtransaction time, continuity, availability and integrity.Rotocraft. A power-driven heavier-than-air aircraft supported in flight byreactions of the air on one or more rotors.Self-sustaining Powered Sailplane. A powered aeroplane with available enginepower which allows it to maintain level flight but not to take off under its ownpower.Standard Atmosphere. An atmosphere defined as follows:a) the air is a perfect dry gas;b) the physical constants are:- Sea level mean molar mass: M 0 = 28.964420 x 10 -3 kg mol -1- Sea level atmospheric pressure: P 0 = 1013.250 hPa- Sea level temperature: t 0 = 15 0 C, T 0 = 288.15 K- Sea level atmospheric density: ρ 0 = 1.2250 kg m -3- Temperature of the ice point: T i = 273.15 K- Universal gas constant: R* = 8.31432 JK -1 mol -1c) the temperature gradients are:Geopotential altitude(km)Temperature gradientFrom To (Kelvin per standard geopotential kilometer)-5.0 11.0 -6.511.0 20.0 0.020.0 32.0 +1.032.0 47.0 +2.847.0 51.0 0.051.0 71.0 -2.871.0 80.0 -2.015 February 2009 AN-1A P.4