PAPI Data Sheet
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Precision Approach Path Indicator RESEARCH ENGINEERS LIMITED

The PAPI (Precision Approach Path Indicator) system is a simple and efficient, positive visual aid to the pilot on final approach. The PAPI system consists of a line of four units at 90˚ to the runway centre line which are typically spaced at 9 metres apart. Units are identical, producing a beam of light with the upper portion white and the lower red. A pilot sees the four individual lights in a combination of red and white, depending on his vertical position. Typically the elevation settings of each unit vary by 20 minutes of arc, the nominal 3˚ glideslope angles being midway between the...

The Modular Concept The Research Engineers PAPI with its modular design is unique. Interchangeable pre-aligned projectors can be easily fitted onto a variety of bases for both fixed and portable applications. • Proven Design – Over fifteen thousand projectors installed around the world in over thirty countries for both civil and military use. • Interchangeable Projectors – Individual projectors are fully interchangeable, simplifying maintenance and spares management. • Stable Reference – Projectors are mounted on a rigid aluminium casting which has integral clinometer reference pads. This...

Clinometer A precision Clinometer has been specifically designed by Research Engineers. It has a longitudinal spirit level with a micrometer type screw calibrated in degrees and minutes. Overall accuracy is better than one minute of arc. The Clinometer has a broad temperature operating range (-50˚C to +70˚C), being constructed in aluminium and stainless steel, and is FAA approved. Needing no electrical supply, the Clinometer is supplied in a fitted protective case. Three Projector PAPI - Available in ICAO or UK CAP168 beam performance. Clinometer - Supplied in a fitted protective case....