ZS100 Helicopter Approach Path Indicator (HAPI)
Compliances: FAA L-881 Photometrics per FAA Advisory Circular 150/5345-28G
FAA AC 150/5390-2B Heliport Design Guide
Registered ISO 9001:2008
ICAO Annex 14, Volume II
HAPI is a modified PAPI system for use as visual slope guidance on heliports.
One HAPI system is for one helicopter approach path.
It is installed on the side opposite the approach, facing across the landing area.
Each HAPI system consists of two (2) HAPI units
A single lamp unit consists of a lamp body and three stents. The lamp body is composed mainly of top cover, front glass panel, box body, lens, color filter, light bulb and bracket, and the lamp is always provided with optical element positioning and protection. The bracket assembly consists of flanges, easy folds, long poles, screws, nuts and gaskets, which are used to support the lamp body and control the height and elevation of the lamp body.
The PAPI system is used to guide aircraft to approach the runway at an appropriate altitude.
The upper half of PAPI’s beam is yellow, with green in the middle and red in the lower half. In
the visual range, different elevation lights in PAPI systems allow the aircraft to see different
colors at different altitudes. The pilot can judge and adjust the height of the plane by seeing
the color of the beam, making it at the right height. When the pilot saw the yellow ray means
to fly too high; when the pilot saw green said height at the right moment; when the pilot saw
the red light said flying too low, could hit obstacles.