757 Flight Crew Training Manual 机组训练手册(31)

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V2 + 15 is the optimum climb speed with takeoff flaps. It results in the maximum altitude gain in the shortest distance from takeoff. Acceleration to higher speeds reduces the altitude gain. If airspeed exceeds V2 + 15 during the initial climb, stop the acceleration but do not attempt to reduce airspeed to V2 + 15. Any speed between V2 + 15 and V2 + 25 knots results in approximately the same takeoff profile. Crosscheck indicated airspeed for proper initial climb speed.
Retract the landing gear after a positive rate of climb is indicated on the altimeter. Do not apply brakes after becoming airborne. Braking is automatically applied when the landing gear lever is placed in the up position. After gear and flaps are retracted, the PNF should verify the gear and flaps indications are normal.

Minimum Fuel Operation - Takeoff
The minimum fuel recommended for takeoff is trip fuel plus reserves. On very short flights this fuel quantity may not be enough to prevent forward fuel pump low pressure lights from illuminating after takeoff.
If any main tank fuel pump indicates low pressure do not turn off fuel pump switches. Avoid rapid acceleration of the airplane, reduce nose-up body attitude and maintain minimum nose-up body angle required for a safe climb gradient.

Immediate Turn after Takeoff - All Engines
Obstacle clearance, noise abatement, or departure procedures may require an immediate turn after takeoff. Initiate the turn at the appropriate altitude (normally at least 400 feet AGL) and maintain V2 + 15 to V2 + 25 with takeoff flaps.
Note: A maximum bank angle of 30° is permitted at V2 + 15 knots with takeoff flaps.
After completing the turn, and at or above flap retraction altitude, accelerate and retract flaps while climbing.
Note: The possibility of an engine failure along the departure track must be
considered. Special engine out procedures, if available, are preferable to a
takeoff weight reduction to ensure all obstacles are cleared.

Roll Modes
After takeoff and climb is stabilized, select LNAV after passing 400 feet AGL. If the departure procedure or route does not begin at the end of the runway, it may be necessary to use the HDG SEL mode at 400 feet AGL to intercept the desired track for LNAV capture. When the departure procedure is not a part of the active flight plan, use HDG SEL or HDG HOLD mode. When an immediate turn after takeoff is necessary, the desired heading may be preset before takeoff.
Note: On Pegasus and PIP FMC equipped airplanes, LNAV may be armed before takeoff and engages automatically at 50 feet.
Navaids and appropriate radials or tracks required for use during the departure may be displayed on the navigation display using the FIX page feature. Use of the STA and WPT switches on the EFIS control panel provides additional information on the map display.

Autopilot Engagement
The autopilot is FAA certified to allow engagement at or above 200 feet AGL after takeoff. Other regulations or airline operating directives may specify a higher minimum altitude. The airplane should be in trim, and the flight director commands should be satisfied prior to autopilot engagement. This prevents unwanted changes from the desired flight path during autopilot engagement.

Flap Retraction Schedule
During training flights, 1,000 feet AFE is normally used as acceleration height to initiate thrust reduction and flap retraction. For noise abatement considerations during line operations, thrust reduction typically occurs at approximately 1,500 feet AFE and acceleration typically occurs between 1,500 and 3,000 feet AFE, or as specified by individual airport noise abatement procedures.
At acceleration height, select climb thrust, accelerate and retract flaps on the Flap Retraction Schedule. Selection of VNAV is the recommended technique for acceleration.
Note: On early models, climb thrust must be selected on the Thrust Mode Select
panel. On later models, selecting a pitch mode (other than V/S) or an
autothrottle mode automatically selects climb thrust.
With VNAV engaged, an acceleration is automatically commanded. Retract flaps on schedule. Check that the thrust reference changes from TO to CLB on the EICAS. If the thrust reference does not change automatically, manually select climb thrust.
If VNAV is not used, at acceleration height select FLCH and set the command speed to flaps up maneuvering speed. Check that the thrust reference changes from TO to CLB on the EICAS. If the thrust reference does not change automatically, manually select climb thrust.
With airspeed increasing, additional flap retraction should be initiated:
. 
for airplanes with Mach/Airspeed indicators; when airspeed reaches the
fixed maneuvering speed for the existing flap position.

. 
for airplanes with speed tape; when airspeed reaches the maneuvering
speed “F” for the existing flap position.
　
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