In the flight conditions window the gas turbine ambient operating conditions, which affect model performance through components such as the Inlet and the Exhaust components can be specified.

Three model types are available to determine the relation between altitude, air speed and air temperature and pressure:

•ISA

The International Standard Atmosphere with a fixed altitude - pressure - temperature relation. Pressure altitude parameter name in GSP is 'Zp'.

The implemented ISA from ICAO supports altitude - pressure - temperature ranging from -5 km to 80 km (see ref. [8]).

•ISA+

As ISA, but with a user specified deviation dTs from the standard temperature

•Custom

User specified pressure and temperature independent of altitude

Air speed can be specified in:

•Mach

Flight Mach number

•Vt

True air speed in m/s

•Vc

Calibrated air speed in m/s

The resulting total pressure Pt and temperature Tt are automatically calculated.

Density is not used in GSP calculations.