Turbine performance question
On the AS350BA the flight manual calls for reducing the MTP and MCP .05 percent for each degree Celsius above Standard temp. For example the Max continuous is usual 98 percent Ng (N1) but on a 100 degree + day it is reduced to around 97%. The Ng is the percentage of compressor rpm (around 51800 I believe - don't have the book handy) My question is this: why then, when the air is thinner and the engine would need to move more volume through by turning faster (increasing rpm) does the FM call to decrease the limit??
Thanks