At departure, why would a pilot need to know the pressure altitude instead of just setting altimeter to the current altimeter setting for the airport? - Quora
![altimeter - When calculating takeoff performance why include airport elevation in pressure altitude? - Aviation Stack Exchange altimeter - When calculating takeoff performance why include airport elevation in pressure altitude? - Aviation Stack Exchange](https://i.stack.imgur.com/WbseN.png)
altimeter - When calculating takeoff performance why include airport elevation in pressure altitude? - Aviation Stack Exchange
![Hey guys, how do I interpolate in these types of questions? Question: Determine the pressure altitude at an airport that is 1386 feet MSL with an altimeter setting of 29.97. 29.97 is Hey guys, how do I interpolate in these types of questions? Question: Determine the pressure altitude at an airport that is 1386 feet MSL with an altimeter setting of 29.97. 29.97 is](https://preview.redd.it/hey-guys-how-do-i-interpolate-in-these-types-of-questions-v0-evqk3txp747a1.png?auto=webp&s=23d76d365f530fed1751859c5864fe8deb567819)