Airport/Heliport Approach Light-System for Approach Azimuth Guidance(SAGA System)

Application

The SAGA (System of Azimuth Guidance for Approach) provides a combined signal of approach azimuth guidance and threshold identification.

Features & Benefits

• Safe operation as the SAGA system is automatically stopped when at least one of its light units is out of service. A signal is available for monitoring of this default status in the control room.
• Easy maintenance through easy access to the lamp and all terminals. No special tools are required.
• The remote control of three brilliancy levels is possible for a better visual comfort for the pilot (no dazzling).
• Efficiency as coupled with a PAPI, the SAGA system supplies the pilot with the security and the comfort of an Optical ILS.
• In order to maintain operation even in very cold and/or wet areas, the light units of SAGA are equipped with heating resistors.
• Additions of red filters (option) provide to the SAGA system with the option of emitting red Flashes corresponding to fly exclusion zone due to obstacles.

Specification

• The System of Azimuth Guidance for Approach will comply with ICAO recommendations Annex 14, Volume I paragraph 5.3.4 and French STAC.
• It will comprise of two flashing units (Master and Slave) located symmetrically on both sides of the runway, or TLOF for heliport, threshold.
• Depending of his position on the approach axis, the pilot will receive visual information of two flashes supplied by the two flashing units of the SAGA.
• If the pilot is on the axis +/- 0.45°, the two flashes are simultaneous.
• If the pilot is not on the axis within an angle comprise between -30 and +30°, the two flashes will be see delayed of a time between 60 and 330 ms (the further the aircraft is from the axis, the greater the delay). The delay between the two flashes produces a sequence effect which shows the direction of the axis.
• The SAGA system will be powered in 230 Vac 50/60 Hz. It will be equipped with 12 Vac 100 W pre-focused reflector lamps.
• It will be remotely controlled in 48Vdc.
• Monitoring will be possible through 2 dedicated dry contacts.
• The SAGA system will be available with heating resistors for cold and/or wet areas.
• The system will be automatically put out of service if at least one of its two flashing units becomes defective.
• The Body, Cap and Support of the flashing unit will be in aluminum alloy, phosphated and painted in aviation yellow. All fixings and fastenings will be stainless steel. The Power Supply Box will be made of reinforced polyester and will be IP 65 rated.
• The legs of the flashing units will be frangible.

Test Video

Operation principle

The SAGA system includes two light units (one Master and one Slave) placed symmetrically on both sides of the Runway, or TLOF, threshold supplying unidirectional rotating beams which give a flashing effect.The pilot receives, each second illumination of two flashes provided in sequence by the two light units.

• When the aircraft flies inside a 9° width angular sector, centered on the approach axis, the pilot sees the two lights flashing simultaneously.
• When the aircraft flies inside a 30° width angular sector, centered on the approach axis and outside the previous one, the pilot sees the two lights flashing with a variable delay (60 to 330 ms) according to the position of the aircraft in the sector. The further the aircraft is from the axis, the greater the delay. The delay between the two flashes produces a sequence effect which shows the direction of the axis.
• The visual signal is not visible when the aircraft flies outside the 30° angular sector

Location on the field
The two light units of a SAGA system must be installed at 10 metres from the runway Edge symmetrically on both sides of the Runway threshold. For TLOF the two units must be installed as close as possible to the threshold edges. The Master unit must be installed on the right of the Threshold and the Slave unit on the left.

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