Pilots say they see this PAPI before they see any competing brand. The interlock relay option operates PAPI in conjunction with runway lights. The level is also used to adjust the tilt switch that is standard with both models. Lamps are adjusted to the correct glide slope angle (± 3′ of arc) by means of an optional aiming device kit equipped with a spirit level. Light distribution curves far exceed FAA requirements.įor FAA style units, a tilt-switch in each PAPI shuts down the entire system if any unit becomes misaligned. On a normal day a 2-lamp PAPI unit is visible from over 10 miles out. PAPIs are manufactured to meet two temperature standards: Class I for normal operation to as low as -35° C, and Class II, with lens heaters, for temperatures to -55° C.įlight Light PAPIs have the most reliable photometrics in the industry. This style is of particular value on remote airstrips where it would be uneconomical to bring in power lines. Style C is a 48V system powered by auto batteries. Lamp brightness is controlled by the output setting on the regulator.
Style B is current powered and operates on 6.6 amp series circuits from an L828 constant current regulator. Style A operates from a 240VAC (120V is also available), single phase, 60 Hz power supply.
The PAPI can be configured to read white/green/red for use on heliports. The two-box PAPI system uses only two LHAs and provides simplified glide slope information. The 3 lamp configuration permits normal operation with one lamp out. The four-box PAPI system consists of four LHAs that use either 2 lamps (ZA757) or 3 lamps (ZA737). A row of PAPI light housing assemblies (LHAs) placed perpendicular to the approach path are seen by the pilot in combinations of red and white to indicate a path that is too high, too low or correctly on slope.
The precision approach path indicator (PAPI) provides the pilot with a safe and accurate glide slope on final approach to the runway. Read the Right Glide Slope From Over Ten Miles Out! Angle deviations that are too high show one or two white lights, and those that are too low show one or two red lights. The CHAPI Heliport System: The CHAPI system is similar to the two-unit PAPI but with a filter inserted between the white and red filters of each lens to provide a 2° wide green sector that, when visible from both units, signals the proper glide slope angle of 6°. A photoelectric control sensor adjusts the PAPI's brightness in response to ambient light conditions. The power adapter is mounted on 2" EMT legs (not supplied) or wall mounted. L867 bases and baseplates are sold separately.
Flexible, water tight conduit and wiring (48"), frangible floor flanges and mounting hardware are provided. The PAPI light housing assembly (LHA) is supported by 2" EMT legs (not included). Where control wire must circle runways or control several devices, a radio modem remote system is a very cost effective alternative. of touchdown.Ī wireless remote control system obviates the need for long runs of control wire to distant PAPIs.
The PAPI projects a distortion free beam of uniform intensity over ten degrees of azimuth and is effective to within 1000 ft. Four legs equipped with frangible floor flanges provide extra stability.