On Dec 26, 7:37*pm, terry wrote:
Air density is criticial to aircraft performance, which is why it
surprises me that both Piper and Cessna Landing performance charts
show the climbout weight limit as a function of pressure height and
not density height. *As I understand it ( at least from Australian
Regs) the aircraft needs to have a minimum climb gradient of 3.2% in
the event of a go around being required. *Surely the achievable climb
out gradient must be density ht dependant. *I dont think I have a
problem with the the understanding of what pressure and density hts
are and how to determine them, but I cant reconcile my understanding
of what they are with the performance chart. *.Am I missing something
here?

The Cessna and Piper POH's I have include both pressure altitude and
then a correction for temp. Its probably easier that way (at least
before computers) since the student doens't need to computer density
altitude. You just follow the chart with the pressure altitude and
then move over to the temp on the cahrt.

-Robert