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This characteristic makes the color change very conspicuous, a key feature of the PAPI signal.

The transition between the two colours must take place over an angle not greater than three minutes of arc. The lower segment of the beam is red, and the upper part is white. Each light unit emits a high-intensity beam.

A color filter may not be necessary with colored LED lights.

Lamps and reflectors replaceable without recalibration.Įach light unit consists of one or more light sources, red filters and lenses.

Schematic diagram of longitudinal section It is generally located on the left-hand side of the runway approximately 300 meters beyond the landing threshold of the runway.Ī typical engineering design specification for a PAPI light unit is shown below: The aircraft is slightly below the glideslope.Ī precision approach path indicator ( PAPI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach. The PAPI can be seen to the right (non-standard) side of the runway.

JSTOR ( December 2009) ( Learn how and when to remove this template message).

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