Description

    In 1978, the United States Federal Aviation Administration (FAA) chose Disan Corporation to design and manufacture the new version of the Visual Approach Slope Indicator (VASI) per FAA Standard FAA-E-2610A. Subsequently, the system has been installed in airports throughout the world. Disan has continued to upgrade the system and is presently delivering to the FAA. Many of the original systems are still in operation after 15 years of service.

    The VASI systems projects concentrated light beams to a pilot landing at an airport. As the pilot aligns the plane with the runway (on final approach), the lights will be visible. If the plane is above the glide path (slope) recommended for the particular airport, the pilot will see a white light beam over a white light beam. If the plane is below the recommended glide path, the pilot will observe a red light beam over a red light beam. If the plane is descending on the proscribed glide path to the runway, the pilot will observe a white light beam over a red light beam.

    The system is designed to be used under Visual Flying Rules. Thus, the pilot has obtained Visual Approach Slope Indication (VASI) to permit access to the runway. The pilot also has runway alignment data available from the beam of light, as the lamp housings are located near the end of a runway.

    During periods of daylight, the light emitted by the VASI is automatically increased to permit observation at a greater distance. During nighttime, the emission is automatically reduced. Normally, the pilot will be able to obtain the VASI signal several miles from the airport.

    The lamps are current regulated for increased life and reliability. In the event of an over-current condition, the system will automatically limit the current to the lamps. Each lamp housing contains three lamps. In the event of a lamp failure, the system will automatically bypass the bad lamp and continue to operate. Solid state electronics are utilized in the power and control assembly. The system has passed the rigid environmental and structural requirements of FAA-E-2610A and applicable documents i.e. MIL-STD-810C.

    The normal installation will include: 2 to 12 lamp housings (as determined by the customer), and one power and control assembly all located at each end of a runway. Also included are: An Aiming Instrument Set complete with a level, aluminum storage case and instruction manuals. The purchaser must supply the site preparation and installation per the manuals. The purchaser normally supplies the lamps.