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B737-300 Cruise and Step Climb

 
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K.Haroon
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Joined: 11 Dec 2005
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PostPosted: Thu Feb 07, 2008 5:02 am    Post subject: B737-300 Cruise and Step Climb Reply with quote

Cruise Speed Determination

ECON cruise is a variable speed schedule that is a function of gross weight, cruise altitude, cost index and headwind component. It is calculated to provide minimum operating cost for the entered cost index. Entry of zero for cost index results in maximum range cruise. Headwind increases the ECON CRZ speed. Tailwind decreases ECON CRZ speed, but not below the zero wind maximum range cruise airspeed.

LRC is a variable speed schedule providing fuel mileage 1% less than the maximum available. FMC provides wind correction to LRC.

Required Time of Arrival (RTA) speed is generated to meet a time required at an RTA specified waypoint on the FMC LEGS page.


Step Climb

It is usually beneficial to climb to a higher altitude if recommended by the FMC or the flight plan, provided the wind information used is reliable. Fuel saved at higher altitude does not normally justify a step climb unless the cruise time of the higher altitude is approximately 20 minutes or longer.
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