If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user
Pulse Light Approach Slope Indicator (PLASI)
From SKYbrary Wiki
Revision as of 09:48, 11 April 2018 by Editor1 (Editor1 moved page Work in progress:Pulse Light Approach Slope Indicator (PLASI) to Pulse Light Approach Slope Indicator (PLASI) without leaving a redirect)
A visual approach aid for use in visual flight conditions which assists the execution of a stabilised approach by transmitting visible beams up the approach from a position adjacent to the intended touchdown point of a runway or helipad rather like a PAPI. A PLASI system usually has an effective visual range of 5 nm during the day and up to 20 nm at night. When on the correct vertical profile, a steady white light will be seen, if above it, the white light will flash and if below it, a steady red light will show. This red light will begin to flash when much too low. Suitably configured PLASI systems may be used to assist either fixed wing or rotary wing approaches.