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20. altitude acquire     [ ' kwai ]  vt.    高度截獲(達(dá)到)
21. active flight plan                     (正在) 實(shí)施的飛行計(jì)劃
22. originate          [ 'rid  ineit ]  v.     起源;產(chǎn)生; 發(fā)源
23. process           [ 'prouses ]   n. ; vt.    過(guò)程; 處理
24. arrival            [ ' raivl ]   n.     到達(dá)
25. approach procedure                進(jìn)近程序; 進(jìn)場(chǎng)著陸程序
26. inbound course    [ ' inbaund ]       歸航航道
27. preset course error                  預(yù)調(diào)航道誤差
28. beam error rate  [ bi:m ]             波束誤差率
29. disappear       [ dis' pi ]  vi.      消失; 隱去
TEXT
[1] In the normal sequence, the F/D is used for TAKEOFF. The autopilot is engaged shortly after TAKEOFF, and the LNAV, VNAV mode of A/P are used in cruise, climb and descent. The approach and AUTOLAND are made using both A/P and F/D. Finally a dual channel A/P GO-AROUND is made. We will introduce TAKEOFF, LNAV, VNAV, and AUTOLAND in lesson 39 and lesson 40.

[2] Figure 39-1 illustrates the TAKEOFF operational procedure.

 

 

 

 

Fig. 39-1    TAKEOFF

A. Initial condition and preflight --------- After power is applied to the airplane, the IRS is placed in the NAV position. The airplane must not be moved until the IRS has completed alignment. During this time, the preflight operations are performed on the other systems. For the DFCS, assure the stab trim (A/P)cutout switch is in NORMAL, engage the yaw damper, check the FMS WARN annunciators and preflight of the FMC. Place both F/D switches to ON. A roll and pitch mode must be selected to bring the F/D bars into view. This occurs when TO/GA is selected. The master light located adjacent to the F/D switch illuminates. The DFCS status annunciation is F/D. Select the runway heading with the heading knob and the desired bank angle limit. Set V2 (Scheduled Target Speed) speed with speed knob on the MCP. The A/S cursor drives to the set speed. Set the MCP altitude to the ATC clearance altitude.

B. Takeoff Roll -------- Place the  A/T engage switch on the MCP to ARM, then the A/T switch is solenoid held in the ARM position and the A/T green light is illuminated. Pressing the TO/GA switch engages the F/D and A/T in the takeoff mode. The flight director bars come into view, TO/GA and N1 (Low Pressure Rotor Speed) are annunciated. The thrust mode annunciation annunciates TO. As the takeoff roll begins and prior to reach 60 knots, the throttle are automatically adjusted to the target N1. In roll, the F/D commands wing level at a maximum of 4 degrees of bank, the F/D does not provide runway steering or rotation commands. At the airspeed greater than 64 knots, the F/D commands 15 degrees nose up. The A/T goes into throttle hold (THR HOLD) and the annunciation is A/T-THR HOLD. Throttle hold remains for 17.5 seconds after liftoff until a radio altitude of 400 feet is attained. The power is removed from the throttle servos to ensure no A/T movement during the takeoff phase.
　
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本文鏈接地址：第31課 大氣數(shù)據(jù)系統(tǒng) LESSON 31 AIR DATA SYSTEM(40)