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The configuration changes are based on maintaining full maneuvering and/or
maximum performance unless specified differently in individual procedures. It is
necessary to apply wind correction to the VREF speeds. See the Command Speed
section in chapter 1 for an explanation of wind corrections.
Non-Normal Landing Configurations and Speeds
The Non-Normal Configuration Landing Distance table in the Performance
Inflight chapter of the QRH shows speeds and landing distances for various
non-normal landing configurations and runway conditions. The target speed for
the approach is the appropriate approach VREF plus the wind and gust additives.
Non-Normal Landing Distance
Because of higher approach speeds associated with the non-normal landing
condition the actual landing distance is increased. The flight crew should review
the non-normal landing distance information in the QRH.
October 31, 2004
767 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.2 FCT 767 (TM)
Visual Approach Slope Indicator (VASI/T - VASI)
The VASI is a system of lights arranged to provide visual descent guidance
information during the approach. All VASI systems are visual projections of the
approach path normally aligned to intersect the runway at a point 1,000 or 1,800
feet beyond the threshold. Flying the VASI glide slope to touchdown is the same
as selecting a visual aim point on the runway adjacent to the VASI installation.
When using a two-bar VASI, the difference between the eye reference path and the
gear path results in a low approach with marginal threshold height. Therefore, the
two-bar VASI system should not be used to determine proper approach profile. It
may provide useful information in alerting the crew to low profile situations.
Some airports have three-bar VASI which provides two visual glide paths. The
additional light bar is located upwind from a standard two-bar installation. When
the airplane is on the glide path, the pilot sees the two white bars and one red bar.
Three-bar VASI may be safely used with respect to threshold height, but may
result in landing further down the runway.
For a T-VASI, flying the approach with one additional white fly down light visible
provides additional wheel clearance.
October 31, 2004
767 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 6.3
Three Bar VASI/T - VASI
Fly Down Lights
Fly Up Lights
Well Below
Glide Path
Slightly Low Low Very Low
Below
Glide Path
On
High
On Glide Path
Very High High Slightly High
High Cockpit Airplanes (3-bar)
Glide Path
Well Below
Glide Path
White VASI Lights
Indicator (VASI)
Visual Approach Slope Visual Approach Slope
Red VASI Lights
White T-VASI Lights
Red T-VASI Lights
Indicator (T-VASI)
October 31, 2004
767 Flight Crew Training Manual
Landing
Copyright © The Boeing Company. See title page for details.
6.4 FCT 767 (TM)
VASI Landing Geometry
Two-bar VASI installations provide one visual glide path which is normally set at
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
Flaps 30 AIM Point at 1,000 Feet
767
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 2.3 49 25 476
-300 3.0 2.2 48 24 461
-400 3.0 2.4 47 22 415
VASI lights
1000'
(no flare)
touchdown point
　
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