Engine Icing During Climb
Engine icing may form when not expected and may occur when there is no evidence of icing on the windshield or other parts of the airplane. Once ice starts to form, accumulation can build very rapidly. Although one bank of clouds may not cause icing, another bank, which is similar, may cause icing.
Note: The engine anti-icing system should be turned on whenever icing
conditions exist or are anticipated. Failure to follow the recommended
anti-ice procedures can result in engine stall, overtemperature or engine
damage.
Economy Climb
The normal economy climb speed schedule of the 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 Schedule - FMC Data Unavailable
737-300 - 737-500
.
250 knots - Below 10,000 feet
737-300 - 737-500
.
280 knots/0.74M - Above 10,000 feet
737-600 - 737-900
.
250 knots/VREF 40 + 70, whichever is higher - Below 10,000 feet
737-600 - 737-900
.
280 knots/0.76M - Above 10,000 feet
Maximum Rate Climb
A maximum rate climb provides both high climb rates and minimum time to cruise altitude. Maximum rate climb can be approximated by using the following: 737-300 - 737-500
.
flaps up Maneuver Speed + 50 knots until intercepting 0.74M
737-600 - 737-900
.
flaps up Maneuver Speed + 50 knots until intercepting 0.76M
Note: The FMC provides maximum rate climb speeds.
Maximum Angle Climb
The FMC provides maximum angle climb speeds. Maximum angle climb 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 flaps up maneuvering speed.
Engine Inoperative Climb
The engine inoperative climb speed is approximately maximum angle climb speed and varies with gross weight and altitude. After flap retraction and all obstructions are cleared, on the FMC ACT ECON CLB page, select ENG OUT followed by the prompt corresponding to the failed engine. This displays the MOD ENG OUT CLB page (ENG OUT CLB for FMC U10.3 and later) which provides advisory data for an engine out condition.
737-300 - 737-500
Note: 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. ENG OUT cannot be executed on FMC update 10.0 and beyond.
Copyright . The Boeing Company. See title page for details.
FCT 737 (TM) October 31, 2006
737 Flight Crew Training Manual
If a thrust loss occurs at other than takeoff thrust, set maximum continuous thrust on the operative engine and adjust the pitch to maintain airspeed.
Note: Selecting CON on the FMC N1 LIMIT page moves the N1 bug to
maximum continuous thrust until another mode is selected or
automatically engaged. Thrust must be manually set.
The MOD ENG OUT CLB (ENG OUT CLB for FMC 10.3 and later) page displays the N1 for maximum continuous thrust, maximum altitude and the engine out climb speed to cruise altitude, or maximum engine out altitude, whichever is lower. Leave thrust set at maximum continuous thrust until airspeed increases to the commanded value.
Note: If computed climb speeds are not available, use flaps up maneuvering speed and maximum continuous thrust.
Cruise
This section provides general guidance for the cruise portion of the flight for maximum passenger comfort and economy.
Maximum Altitude
Maximum altitude is the highest altitude at which the airplane can be operated. It is determined by three basic characteristics, which are unique to each airplane model. The FMC predicted maximum altitude is the lowest of:
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