On Aug 11, 5:50*am, Mike Ash wrote:
In article ,

Many runways are only roughly level, and contain small but noticeable
slopes. This is especially true at smaller airports. These slopes are
usually hard to discern from the ground (although I'm sure people will
chime in with counterexamples here)


I seem to remember that the runway in my hometown Bangalore had its
maximum elevation at roughly the center


and don't affect aircraft performance significantly.


From what I've heard, (a) aircraft are certified for a 2% slope and
(b) you're barred from employing flexible takeoffs where the runway is
sloped (I don't know if this applies to *any* slope).

The other aspect this influences - and I think this doesn't apply for
GA aircraft - is the maximum takeoff weight. FAR 121.189(e) mentions
runway gradient as a factor in MTOW calculations.

Ramapriya