The Helicopter Approach Path Indicator (HAPI) system is a highly advanced visual aid designed to enhance the safety and precision of helicopter landings by providing pilots with a clear and accurate glide slope on final approach. Through the use of distinct red and green LED indicators, pilots can quickly assess whether their descent path is too steep, too shallow, or correctly aligned with the optimal approach slope. This visual guidance is vital for both day and night operations, in permanent or temporary landing environments, and in civil or military scenarios.
The LED-based HAPI system is available in two core models with a wide range of configurations to meet international aviation standards, including ICAO Annex 14, Volume 2, FAA AC 150/5390-2C, and STANAG requirements. It has been successfully deployed worldwide across diverse conditions—from remote emergency helipads and hospital rooftops to high-security military airfields—proving its durability and effectiveness.
One of the standout features of the LED HAPI system is its advanced optical design. Utilizing patented LED optics, the system achieves exceptional power efficiency while delivering high-intensity illumination and an ultra-sharp transition between red and green light zones. This ensures precise and unambiguous visual cues for approaching pilots. The inclusion of NVG-compatible infrared (IR) LEDs further supports night vision goggle operations, making it suitable for military and low-visibility applications.
Installation of the HAPI system is designed for both ease and flexibility. For permanent installations, standard frangible mounting ensures compliance with aviation safety protocols. For temporary or mobile use, the system features retractable legs, a lightweight and compact form factor, and durable construction for quick setup and transport. An integrated digital level assists with accurate positioning, and LED control panels are designed for gloved operation. The removable, replaceable antenna enhances maintainability in the field.
The LED HAPI is engineered for ultra-low power consumption, which allows it to be powered through various sources without compromising performance. Available power options include solar kits with air-transportable containers, battery kits with AC input backups, generator kits (gas or diesel), and standard AC connections (100–240 VAC, 50/60 Hz) with 3- or 5-step current compatibility. This versatility makes the system ideal for use in locations with unreliable or unavailable electrical infrastructure.
Control options are equally flexible. The system supports both local and remote operation through wired or wireless interfaces. Non-wireless control includes local access and AC input for 3- and 5-step adjustments. Wireless configurations utilize either 900 MHz FHSS or 2.4 GHz DSSS technology, both encrypted for secure communication. These options enable integration with broader airfield lighting systems or allow for stand-alone, remotely managed installations.
Built for rugged field conditions, the HAPI light features a powder-coated aluminum chassis in standard aviation orange, with custom color options available. Stainless steel and anodized aluminum hardware further contribute to its weather resistance and mechanical durability. The optical system includes a glass lens to ensure long-term photometric stability. The fixture is rated for wind speeds up to 161 kph (100 mph) and operates reliably in ambient temperatures ranging from -35°C to +55°C (-31°F to +131°F). In terms of ingress protection, the system is rated NEMA 4 and EN 60529 IP55, with an upgrade path to IP66 for marine or extreme environments.
The LED HAPI system can be tailored to a wide range of applications, offering both visible-only and visible/IR output options. Mounting can be permanent or portable, and power and control configurations can be selected to meet the specific requirements of each site. Whether installed at a busy urban hospital, a remote mountaintop rescue station, a temporary military forward operating base, or a civil aviation facility, the HAPI system consistently delivers reliable performance and compliance with global aviation safety standards.
https://www.avlite.com/product/helicopter-approach-path-indicator-hapi/
