Originally Posted by
ldt_py
There are several different types of VGSI's:
Visual Approach Slope Indicator (VASI)
Precision Approach Path Indicator (PAPI)
Pulsating Visual Approach Slope Indicator (PVASI)
Three-color Visual Approach Slope Indicator (T-VASI)
Helicopter Approach Path Indicator (HAPI)
Don't forget the alignment of elements non-lighting system. Have never actually encountered one yet.
https://books.google.ca/books?id=B3a...rcraft&f=false
And maybe even the paddles guy on an aircraft carrier.
Landing Signal Officer - Wikipedia, the free encyclopedia