Posted: Thu Feb 07, 2008 3:29 am Post subject: 737-300 Econ, Max Angle, Max Rate & One Eng Inop Climb
Economy Climb Speed Schedule of FMC:
The normal economy climb speed schedule of FMC minimizes trip cost. It varies with gross weight and is influenced by cost index. The FMC generates a fixed speed schedule as a function of cost index and weight.
Economy climb speed normally exceeds 250 knots for all gross weights. FMC climb speed is limited to 250 knots below 10,000 feet (FAA Airspace), or a lower waypoint speed restriction, if entered. If the use of a higher speed below 10,000 feet is allowed, ECON speed provides additional cost savings.
Economy Climb Speed Schedule without FMC Data:
- 250 knots below 10,000 feet
- 280 knots / 0.74 M above 10,000 feet
Maximum Rate Climb:
A maximum rate climb provides both high climb rates and minimum time to cruise altitude. FMC provides maximum rate climb speeds. Maximum rate climb can be approximated by using the following:
" Flaps up maneuvering speed + 50 knots until intercepting 0.74 M "
Maximum Angle Climb:
The FMC provides maximum angle climb speeds. This speed is normally used for obstacle clearance, minimum crossing altitude or to reach a specified altitude in a minimum distance. It varies with gross weight and provides approximately the same climb gradient as flap up maneuvering speed.
Engine Inoperative Climb:
The engine inoperative climb speed is approximately maximum angle climb speed and varies with gross weight and altitude. MOD ENG OUT CLB page provides advisory data for an engine out condition. Do not execute the page if VNAV is required for any arrival procedure. If this page is executed, all performance predictions are blanked, VNAV cannot be engaged and though the FMC transitions to ENG OUT CRZ, after a new cruise altitude is inserted, it does not transition to descent.
Selecting CON on the FMC N1 LIMIT page moves the N1 bug to maximum continuous thrust. Thrust must be set manually. Leave thrust set at maximum continuous thrust until airspeed increases to the commanded value. If computed climb speeds are not available, use flaps up maneuvering speed and maximum continuous thrust.
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