a group of aeronautical ground lights so arranged and located as to give early direction and roll guidance on the approach to a runway

lighting measuring system with runway alignment indicator lights that use by pilots during instrument landing approach to align the aircraft with the centerline of the runway, valgustusmõõtesüsteem koos lennuraja joondamise indikaatortuledega, mida kasutavad piloodid instrumentaalmaandumislähenemise ajal, et joondada õhusõiduk raja keskjoonega