Here’s a really quick and easy rule of thumb to get an approximate descent rate once established on the PAPI approach lighting system. Here’s how it’s done:
(This should work on most IF Aircraft fairly well)
Just X your Groundspeed (GS) by 5!
Yep, that’s it. It’s that easy!
There’s also another (more accurate) way that I know of where you use the actual 3% gradient, but by the time you’ve finished calculating, you’re on the ground already. So this is far more practical!
Hope you all found this useful✈️
Let me know if I missed anything.