Read the Right Glide Slope
From Over Ten Miles Out!
The precision approach path indicator (PAPI) provides the pilot with a safe and accurate glide slope on final approach to the runway. 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 four-box PAPI system consists of four LHAs that use either 2 lamps (ZA757) or 3 lamps (ZA737). The 3 lamp configuration permits normal operation with one lamp out.
The two-box PAPI system uses only two LHAs and provides simplified glide slope information. The PAPI can be configured to read white/green/red for use on heliports.
Three energy styles are available:
Style A operates from a 240VAC (120V is also available), single phase, 60 Hz power supply. 120V and 50Hz are also available.
Style B is current powered and operates on 6.6 amp series circuits from an L828 constant current regulator. Lamp brightness is controlled by the output setting on the regulator.
Style C is a 48V system powered by auto batteries. This style is of particular value on remote airstrips where it would be uneconomical to bring in power lines.
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.
Flight Light PAPIs have the most reliable photometrics in the industry. On a normal day a 2-lamp PAPI unit is visible from over 10 miles out. Light distribution curves far exceed FAA requirements.
For FAA style units, a tilt-switch in each PAPI shuts down the entire system if any unit becomes misaligned.
Optional Aiming Device
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. The level is also used to adjust the tilt switch that is standard with both models.
Interlock Relay Option
The interlock relay option operates PAPI in conjunction with runway lights.
||A wireless remote control system obviates the need for long runs of control wire to distant PAPIs. Where control wire must circle runways or control several devices, a radio modem remote system is a very cost effective alternative. Call for details.