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3°. Three-bar VASI installations provide two visual glide paths. The lower glide
path is provided by the near and middle bars and is normally set at 3° while the
upper glide path, provided by the middle and far bars, is normally 1/4° higher
(3.25°). This higher glide path is intended for use only by high cockpit (long
wheelbase) airplanes to provide a sufficient threshold crossing height.
Note: The use of a two bar VASI system is not recommended. A two bar VASI
system provides a visual aim point that results in main landing gear
touchdown at, or very near, the end of the runway threshold.
Two Bar/Three Bar VASI Landing Geometry
The following diagrams use these conditions:
• data is based upon typical landing weight
• airplane body attitudes are based on Flaps 30, VREF 30 + 5 and should be
reduced by 1° for each 5 knots above this speed.
• eye height is calculated at the moment the main gear is over the threshold.
Two Bar VASI Landing Geometry
777-200 - 777-300ER
VASI lights
1000'
(no flare)
touchdown point
Main gear
VASI glide path
Threshold
Aim point
Main
Gear Path
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.6 FCT 777/787 Preliminary (TM)
Three Bar (Upper Glide Path) VASI Landing Geometry
777-200 - 777-300ER
Flaps 30 AIM Point at 1,000 Feet
777
Model
Visual Glide
Path
(degrees)
Airplane
Body Attitude
(degrees)
Threshold Height Main Gear
Touchdown
Point - no flare
(feet)
Pilot Eye
Height (feet)
Main Gear
Height (feet)
-200 3.0 1.9 47 20 373
-200LR 3.0 0.9 48 22 416
-300 3.0 1.4 46 19 363
-300ER 3.0 1.7 47 19 363
Flaps 30 AIM Point at 1,800 Feet
777
Model
Visual Glide
Path
(degrees)
Airplane
Body Attitude
(degrees)
Threshold Height Main Gear
Touchdown
Point - no flare
(feet)
Pilot Eye
Height (feet)
Main Gear
Height (feet)
-200 3.25 1.7 97 69 1221
-200LR 3.25 0.6 97 72 1262
-300 3.25 1.2 96 69 1211
-300ER 3.25 1.5 97 69 1211
VASI lights
1800'
(no flare)
touchdown point
Main gear
Threshold
Main
Gear Path
VASI glide path
Aim point
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 6.7
Two Bar VASI Landing Geometry
787-8
Three Bar (Upper Glide Path) VASI Landing Geometry
787-8
Flaps 30 AIM Point at 1,000 Feet
Visual Glide Path
(degrees)
Airplane Body
Attitude
(degrees)
Threshold Height Main Gear
Touchdown
Point - no flare
(feet)
Pilot Eye
Height (feet)
Main Gear
Height (feet)
3.0 TBD TBD TBD TBD
Flaps 30 AIM Point at 1,800 Feet
Visual Glide Path
(degrees)
Airplane Body
Attitude
(degrees)
Threshold Height Main Gear
Touchdown
Point - no flare
(feet)
Pilot Eye
Height (feet)
Main Gear
Height (feet)
3.25 TBD TBD TBD TBD
VASI lights
1000'
(no flare)
touchdown point
Main gear
VASI glide path
Threshold
Aim point
Main
Gear Path
TBD
VASI lights
1800'
(no flare)
touchdown point
Main gear
Threshold
Main
Gear Path
VASI glide path
Aim point
TBD
October 31, 2006
777/787 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.8 FCT 777/787 Preliminary (TM)
Precision Approach Path Indicator (PAPI)
The PAPI uses lights which are normally on the left side of the runway. They are
similar to the VASI, but are installed in a single row of light units.
When the airplane is on a normal 3° glide path, the pilot sees two white lights on
the left and two red lights on the right. The PAPI may be safely used with respect
to threshold height, but may result in landing further down the runway. The PAPI
is normally aligned to intersect the runway 1,000 to 1,500 feet down the runway.
PAPI Landing Geometry
Landing Geometry
Visual Aim Point
During visual approaches many techniques and methods are used to ensure main
landing gear touchdown at the desired point on the runway. One of the most
common methods used is to aim at the desired gear touchdown point on the
runway, then adjust the final approach glide path until the selected point appears
　
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本文鏈接地址：787機組訓練手冊Flight Crew Training Manual 787(95)