737机组训练手册 Flight Crew Training Manual FCTM(87)

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When using a two-bar VASI, the difference between the eye reference path and the gear path results in a normal approach and threshold height. It provides 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 one white bar and two red bars. 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.

737 Flight Crew Training  Manual

Three Bar VASI/T - VASI
Visual Approach Slope
Visual Approach Slope Indicator (VASI)
Indicator (T-VASI)
Red T-VASI Lights White VASI Lights
Red VASI Lights White T-VASI Lights
Fly Down Lights
Standard (3-bar)

High Very High High Slightly High

 

Above
Glide
Path

 

On Glide Path On Fly Up Lights Glide Path
Below Glide Path

 

Slightly Low Low Very Low

Well Below
Glide Path

Copyright . The Boeing Company. See title page for details.
FCT 737 (TM) October 31, 2006
737 Flight Crew Training  Manual

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.
Two Bar VASI Landing Geometry
The following diagrams use these conditions:
.  
data is based upon typical landing weight
737-800SFP

.  
data shown for the 737-800SFP airplane equipped with a 2-position tail
skid. For the 737-800SFP airplane equipped with a 1-position tail skid,
use basic 737-800 data. Differences between basic 737-800 data and the
737-800SFP airplane equipped with a 1-position tail skid are negligible.

.  
airplane body attitudes are based on Flaps 30 and Flaps 40, VREF (for the
flap setting used) + 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.

VASI Glide Path

Main Gear
Main
Gear Path

Threshold

 

737 Flight Crew Training  Manual
737-300 - 737-500
Flaps 30  AIM Point at 1,000 Feet 
737 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) 
-300  3.0  3.2  50  35  662 
-400  3.0  3.1  50  34  652 
-500  3.0  3.3  50  35  670 

737-300 - 737-500
Flaps 40  AIM Point at 1,000 Feet 
737 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) 
-300  3.0  1.7  50  36  686 
-400  3.0  1.5  50  36  681 
-500  3.0  1.9  50  36  690 

737-600 - 737-900
Flaps 30  AIM Point at 1,000 Feet 
737 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) 
-600  3.0  3.7  50  36  657 
-700  3.0  3.7  50  34  647 
-800  3.0  2.4  49  34  651 
-800SFP  3.0  3.6  50  33  633 
-900  3.0  1.6  49  35  659 

Copyright . The Boeing Company. See title page for details.
FCT 737 (TM) October 31, 2006
737 Flight Crew Training  Manual
737-600 - 737-900
Flaps 40  AIM Point at 1,000 Feet 
737 Model  Visual Glide Path in (degrees)  Airplane Body Attitude (degrees)  Threshold Height  Main Gear Touchdown Point - no flare (feet) 
Pilot Eye Height (feet)  Main Gear Height (feet) 
　
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