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October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 4.3
Transition to Climb
Maintain flaps up maneuvering speed until clear of obstacles or above minimum
crossing altitudes. If there are no altitude or airspeed restrictions, accelerate to the
desired climb speed schedule. The sooner the airplane can be accelerated to the
climb speed schedule, the more time and fuel efficient the flight.
Climb Speed Determination
Enroute climb speed is automatically computed by the FMC and displayed on the
climb and progress pages. It is also displayed as command speed when VNAV is
engaged. Below the speed transition altitude the FMC targets the transition speed
limit stored in the navigation data base for the departure airport (250 knots below
10,000 feet MSL in FAA airspace), or flaps up maneuvering speed, whichever is
higher. The FMC applies waypoint-related speed restrictions displayed on the
LEGS pages, and altitude-related speed restrictions displayed on the climb page.
The FMC provides optimum climb speed modes for economy (ECON) operation
and engine out (ENG OUT) operation. These optimum speeds can be changed
before or during the climb. Reference speeds are also provided for maximum
angle climb (MAX ANGLE) operation.
The ECON climb speed is a constant speed/constant Mach schedule optimized to
obtain the minimum airplane operating cost. The constant Mach value is set equal
to the economy cruise Mach calculated for the cruise altitude entered in the FMC.
For very low cruise altitudes the economy climb speed is increased above normal
values to match the economy cruise speed at the entered cruise altitude. For ECON
climb, the speed is a function of gross weight (predicted weight at top of climb),
predicted top of climb wind, predicted top of climb temperature deviation from
ISA, and cost index.
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 AUTO or 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.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
4.4 FCT 777/787 Preliminary (TM)
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
777-200 - 777-300ER
• 250 knots/VREF 30 + 80, whichever is higher- Below 10,000 feet
787-8
• 250 knots/VREF 30 + TBD, whichever is higher- Below 10,000 feet
777-200 - 777-300ER
• 310 knots/0.84M - Above 10,000 feet
787-8
• TBD knots/0.TBDM - 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:
• flaps up Maneuver Speed + 60 knots until intercepting 0.82M
Note: The FMC does not provide 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. At high altitudes and weights, a fixed
Mach is used as an upper limit on the engine out climb speed. Engine out climb
speed is the FMC default used during climb when ENG OUT CLIMB is selected.
Select ENG OUT CLIMB after flap retraction and all obstructions are cleared.
If a thrust loss occurs at other than takeoff thrust, set maximum continuous thrust
　
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