A HEATWAVE IS SWEEPING OVER EUROPE. WITH HIGH TEMPERATURES , THE AIR EXPANDS TO A WING AND PROPELLER AERODYNAMIC S AND ENGINE PERFORMANCE DIRECTLY DEPEND ON THE AIR DENSITY. LOWER DENSITY COMPARED WITH THE ISA*. *ISA: INTERNATIONAL STANDARD ATMOSPHERE CREDIT: METDESK SUNNY AND VICKY ARE PLANNING A FLIGHT ACROSS THE I REMEMBER FROM THEORY THAT THE DENSITY ALTITUDE SINCE PERFORMANCE IS DRIVEN BY THE AIR DENSITY, ALPS . IMPACTS FROM BOTH THE PRESSURE AND THE TEMPERATURE GIVES AN INDICATION OF THE EXPECTED PERFORMANCE. HOW DOES IT WORK? AT THE AIRFIELD NEED TO BE CONSIDERED . +10 º ~+1 200 FT DENSITY ALTITUDE DENSITY ALTITUDE IS THE ALTITUDE RELATIV E TO ISA AT WHICH THE AIR DENSITY WOULD BE EQUAL TO THE INDICATED AIR DENSITY HERE. THE POH HAS TAKE -OFF, LANDING AND CLI MB /CEILING PERFORMANCE AS A FUN CION OF LOWER AIR DENSITY MEANS L ESS LIFT AND POORER ENGINE PERFORMANCE. THEREFORE TAKE-OFF IS LATER, AND THE CLIMB RATE IS LACKLUSTRE. TEMPERATURE AND PRESSURE ALTITUDE. FOR THIS ROUTE , WE NEED TO REACH AN ALTITUDE OF 10 000 F T. AT THAT ALTITUDE, THE TEMPERATURE IS TOO HIGH TO HAVE ENOUGH CLIMB PERFORMANCE. WE COULD POSTPONE THE FLIGHT UNTIL THE AIR GETS COOLER, OR WE’LL HAVE TO TAKE ANOTHER ROUTE. +10 º ~+10% T/O DISTANCE THIS TIME, VICKY AND SUNNY DECIDE TO TAKE A THEY CROSS THE HIGHEST PA SS WITH A SAFE ALTITUDE DIFFERENT ROUTE WITH A LOWER ALTITUDE. MARGIN. You can find links to the -Skybrary hot and high operations -FAA density altitude in the downloads section of this issue Please send your comments and ideas to [email protected] Join the GA Community! www.easa.europa.eu/community/ga #13 (2019 ) BY ELENA GARCIA & MONICA MESTRE @ EASA .