"Green dot speed" for the B777

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B 777 FMC speeds :

Maximum angle climb speed:

The maximum angle climb speed schedule is a fixed CAS/Mach schedule which is evaluated and displayed to the pilot in terms of current KCAS equivalent. The schedule is designed to yield minimum distance to optimum altitude, but also provides excellent instantaneous climb gradient performance. The maximum angle climb CAS is limited by a minimum speed equal to VREF30+80, to ensure full maneuvring capability. The maximum angle climb speed is provided as a function of gross weight in the FMC performance database. The corresponding maximum angle climb Mach numbert does not vary with gross weight, and is provided as constant in the performance database.


Engine Out climb/driftdown speed

The engine Out climb/driftdown speed schedule is a variable CAS schedule wich is computed using a fixed lift coefficient (CL) and then limited by the CAS equivalent of a fixed mach number. The schedule provides near maximum climb gradient performance with one engine inoperative. The CL value and corresponding limit mach number value are provided as constants in the FMC performance database.


Flaps up holding speed

The flaps up hold speed schedule approximates minimum fuel flow (low altitudes) or minimum drag (higher altitudes), subject to a lower limit of VREF30+80. The pilot may enter alternate hold speed values wich fall within the allowable speed enveloppe. Flaps up hold speeds are defined as lift coefficient (CL) as a function of gross weight divided by atmospheric pressure ratio in the FMC performance database.