Precision Approach Path Indicator
|Term||Precision Approach Path Indicator|
1. An approach path indicator system consisting of four light units situated on the left side of the runway (on both sides of the runway, in the case of the military) in the form of a wing bar.
2. An airport lighting facility, similar to VASI, providing vertical approach slope guidance to aircraft during approach to landing.
1. CANADA (2010) Transport Canada, "Glossary for Pilots and Air Traffic Services Personnel" (TP 11958E) 
2. FAA (2010) Pilot Controller Glossary, August 2010