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# Density altitude aviation

Posted on 2013-06-23

I wanted to check my logic for the following question:

"You are contemplating a take-off at a high aerodrome(1460ft elevation) on a hot day(temperature 29 degrees Celsius). Approximately what is the current density altitude if the QNH is 1013mb?

The answer is 3500?

Density altitude= pressure altitude + (120x (OAT-ISA))

So taking isa at sea level as 15 degrees Celsius and -2 for every 1000 feet then isa at say 1500 feet 12degrees Celsius.

29-12= 17 x 120->2040

2040 + 1013= 3053

Am I just being to approximate with my answer or am I doing something wrong?

Thanks for the help.

Regards,

Ross