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| Visual Approach Slope Indicator (VASI) |
What is Visual Approach Slope Indicator (VASI)
VASI are light systems to assist pilots with visual guidance during an aircraft landing by indicating the pilot’s right angle of approach. They are located on the side of the runway and can be used both during the day and at night. The VASI is especially effective during approaches over water or featureless terrain where other sources of visual reference are lacking or misleading, and at night. It provides optimum descent guidance for landing and minimizes the possibility of undershooting or overshooting the designated touchdown area.
Fact of VASI :
1) VASI may have 2 bars (rows) of lights.
2) A 2-bar system has one near and one far bar. Each bar can contain 2 light units.
3) If both bars show white lights, you are too high for your landing.
4) If both bars show red, you are too low.
5) If the far bar is red and the near bar is white you are just right (be on the glide path).
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| Precision Approach Indicator (PAPI) |
What is Precision Approach Indicator (PAPI)?
A precision approach path indicator (PAPI) is a visual aidthat provides guidance information to help a pilot acquire and maintain the correct approach (in the vertical plane) to an airport or an aerodrome. It is generally located on the left-hand side of the runway approximately 300 meters beyond the landing threshold of the runway.
Fact of PAPI:
PAPI works in a similar manner to the VASI. The difference is PAPI only has one row of lights.
PAPI works in a similar manner to the VASI. The difference is PAPI only has one row of lights.
1) This one row contains 4 light units.
2) If all four lights show white, you are too high for your landing.
3) If all four lights show red, you are too low.
4) If two lights show red and two lights show white you are just right (be on the glide path).
Please refer to sources given below for more information.
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