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時間:2010-05-22 22:51來源:藍天飛行翻譯 作者:admin
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Note: Do not trim during the flare or after touchdown. Trimming in the flare
increases the possibility of a tailstrike.
Landing Flare Profile
The following diagrams use these conditions:
• 3° approach glide path
• flare distance is approximately 1,000 to 2,000 feet beyond the threshold
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.12 FCT 777/787 Preliminary (TM)
• typical landing flare times range from 4 to 8 seconds and are a function of
approach speed
• airplane body attitudes are based upon typical landing weights, flaps 30,
VREF 30 + 5 (approach) and VREF 30 + 0 (landing), and should be
reduced by 1° for each 5 knots above this speed.
777-200 - 777-300ER
787-8
Typically, the pitch attitude increases slightly during the actual landing, but avoid
over-rotating. Do not increase the pitch attitude after touchdown; this could lead
to a tail strike.
Shifting the visual sighting point down the runway assists in controlling the pitch
attitude during the flare. A smooth power reduction to idle also assists in
controlling the natural nose down pitch change associated with thrust reduction.
Hold sufficient back pressure on the control column to keep the pitch attitude
constant.
Avoid rapid control column movements during the flare. If the flare is too abrupt
and thrust is excessive near touchdown, the airplane tends to float in ground effect.
Do not allow the airplane to float; fly the airplane onto the runway. Do not extend
the flare by increasing pitch attitude in an attempt to achieve a perfectly smooth
touchdown. Do not attempt to hold the nose wheels off the runway.
4°- 5°
h=50’
1° - 2°
Threshold Touchdown
TBD°
h=50’
TBD°
Threshold Touchdown
TBD
TBD
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 6.13
Bounced Landing Recovery
If the airplane should bounce, hold or re-establish a normal landing attitude and
add thrust as necessary to control the rate of descent. Thrust need not be added for
a shallow bounce or skip. When a high, hard bounce occurs, initiate a go-around.
Apply go-around thrust and use normal go-around procedures. Do not retract the
landing gear until a positive rate of climb is established because a second
touchdown may occur during the go-around.
Bounced landings can occur because higher than idle power is maintained through
initial touchdown, disabling the automatic speedbrake deployment even when the
speedbrakes are armed.
Rejected Landing
A rejected landing maneuver is trained and evaluated by some operators and
regulatory agencies. Although the FCOM/QRH does not contain a procedure or
maneuver titled Rejected Landing, the requirements of this maneuver can be
accomplished by doing the Go-Around Procedure if it is initiated prior to
touchdown. Refer to Chapter 5, Go-Around after Touchdown, for more
information on this subject.
Normal Touchdown Attitude
The following figures illustrate the effect of airspeed on body attitude at
touchdown. It shows airplane attitude at a normal touchdown speed for flaps 30
(VREF30 to VREF 30 - 5 knots). With proper airspeed control and thrust
management, touchdown occurs at no less than VREF - 5. The illustration also
shows that touchdown at a speed below normal touchdown speed, in this case
VREF30 - 10 knots, seriously reduces aft fuselage-runway clearance.
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.14 FCT 777/787 Preliminary (TM)
Touchdown Body Attitudes
777-200
12
14
8
10
2
4
6
0
Gross Weight - 1000 lbs (kgs)
Pitch Attitude - (Degrees)
280 320 360 400 440 480 520 560
Body Contact Possible
V
V
V
(127) (145) (163) (181) (200) (218) (236) (254)
Attitude Limit:
Main Gear Struts Extended
Main Gear Struts Compressed
REF 30 - 10
REF 30 - 5
REF 30
- 150 fpm at Touchdown
Sea Level Standard Day
Flaps 30
Forward CG Limit
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 6.15
777-200LR
12
8
10
2
4
6
0
Pitch Attitude - (Degrees)
360 400 440 480 520 560 600 640
 
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本文鏈接地址:787機組訓練手冊Flight Crew Training Manual 787(97)
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