Edit:
Both CAS/IAS and Mach no will decrease.
Mach: when temp increases, the local speed of sound increases. Since your TAS is constant, it is now a lower percentage of LSS.
IAS/CAS: when temp increases, air density decreases. With decreasing air density, IAS/CAS reduces for a given TAS.
Last edited by bfisk; 13th November 2009 at 18:05.