![Aerospace | Free Full-Text | The PAPI Lights-Based Vision System for Aircraft Automatic Control during Approach and Landing Aerospace | Free Full-Text | The PAPI Lights-Based Vision System for Aircraft Automatic Control during Approach and Landing](https://www.mdpi.com/aerospace/aerospace-09-00285/article_deploy/html/images/aerospace-09-00285-g001.png)
Aerospace | Free Full-Text | The PAPI Lights-Based Vision System for Aircraft Automatic Control during Approach and Landing
Comparison of PAPI, VASI, and OLS meatball and datum lights... PAPI - Precision Approach Path indicator. A precision approach path indicator (PAPI) is a visual aid that provides guidance information to help
![landing - What is the average deviation from the PAPI glide slope at the threshold? - Aviation Stack Exchange landing - What is the average deviation from the PAPI glide slope at the threshold? - Aviation Stack Exchange](https://i.stack.imgur.com/Pciif.png)