A HEATWAVE IS SWEEPING OVER EUROPE. WITH HIGH , THE AIR EXPANDS TO A WING AND PROPELLER AERODYNAMIC S AND ENGINE LOWER DENSITY COMPARED WITH THE ISA*. PERFORMANCE DIRECTLY DEPEND ON THE AIR DENSITY.

*ISA: INTERNATIONAL STANDARD ATMOSPHERE CREDIT: METDESK

SUNNY AND VICKY ARE PLANNING A FLIGHT ACROSS THE I REMEMBER FROM THEORY THAT THE DENSITY SINCE PERFORMANCE IS DRIVEN BY THE AIR DENSITY, ALPS . GIVES AN INDICATION OF THE EXPECTED PERFORMANCE. IMPACTS FROM BOTH THE PRESSURE AND THE 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.

LOWER AIR DENSITY MEANS L ESS LIFT AND POORER ENGINE PERFORMANCE. THEREFORE THE POH HAS TAKE -OFF, LANDING AND CLI MB /CEILING PERFORMANCE AS A FUN CION OF TAKE-OFF IS LATER, AND THE CLIMB RATE IS LACKLUSTRE. TEMPERATURE AND .

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]

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#13 (2019 ) BY ELENA GARCIA & MONICA MESTRE @ EASA