FLYING QUALITIES OF PILOTED AIRCRAFT - CAFE Foundation

MIL–STD–1797AkRatio of “commanded roll performance” to “applicable roll performance requirement”of 4.5.8.1, where:a. “Applicable roll performance requirement,”( φ requirement is determinedfrom 4.5.8.1 for the Class and Flight Phase Category under considerationb. “Commanded roll performance,”( φ , is the bank angle attained commandin the stated time for a given step roll command with yaw control pedalsemployed as specified in 4.5.8.1k =φ tφ tcommandrequirementt nβ Time for the dutch roll oscillation in the sideslip response to reach the nth localmaximum for a right step or pulse roll–control command, or the nth local minimumfor a left command. In the event a step control input cannot be accomplished, thecontrol shall be moved as abruptly as practical and, for purposes of this definition,time shall be measured from the instant the cockpit control deflection passesthrough half the amplitude of the commanded value. For pulse inputs, time shall bemeasured from a point halfway through the duration of the pulseψ βPhase angle expressed as a lag for a cosine representation of the dutch rolloscillation in sideslip, whereψ β with n as used in the definition of t360 T dt nβ n – 1) 360 (degrees)n βabove( p/β Phase angle between roll rate and sideslip in the free dutch roll oscillation. Angle ispositive when p leads β by an angle between 0 and 180 deg φ β d At any instant, the ratio of amplitudes of the bank–angle and sideslip–angleenvelopes in the dutch roll mode14