A helicopter approach path indicator (HAPI) is a visual glideslope indicator (VGSI), providing visual vertical course and descent cues for pilots. A HAPI system consists of:
PAPI units may be voltage powered (style A) or current powered (style B).
Class I systems operate -31 to 131° F (-35 to 55° C) whereas class II systems operate -67 to 131° F (-55 to 55° C).
While VSGs are optional for helipads, provide one if:
Install a visual approach slope indicator (VASI) to serve the heliport approach to a heliport if one or more of the following conditions exist, especially at night:
A standard VASI for helicopter operations consists of the following:
The HAPI signal format includes 4 discrete signal sectors, providing an “above slope”, an “on slope”, a “slightly below” and a “below slope” signal. The signal repetition rate of the flashing sector should be at least 2 Hz.
|Sector||Color and Format|
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