In article 16772588594cea8dcd1e4785b1122d71@TeraNews, "Richard Kaplan"
writes:

Take the airplane up to an altitude near its service ceiling, practically
speaking about 10,000 or 11,000 feet for a 172. Lots of engine problems
can show up at altitude which are not apparent down low.


Richard,

I've never heard this before. What are the problems to look for when at up
there?

Chuck