ITT Indicator
Inter-Turbine Temperature (ITT or T5) is shown by the ITT indicator found on
each EICAS page. The instrument shows the gas temperature between the
compressor and power turbines. The ITT indicator uses a circular scale with
a moving pointer and a digital value indicating Inter-Turbine Temperature in
degrees Celsius with 1°C increments. The pointer moves through a range
from 0 to 1200°C.
During engine start, the instrument markings indicate a normal operating
range (green arc) from 200°C to 925°C, caution range (yellow arc) from
926°C to 1090°C and a red radial line at >1090°C. The indicator also shows
“STRT” directly above the ITT digits, signifying the indicator is in start mode.
If the ITT is greater than 1090°C, the title, pointer, and digits will ash red. If
the ITT is between 926°C and 1090°C, the title, pointer, and digits will ash
amber. Otherwise, the title and pointer are white and the digits are green.
During normal operation, the instrument markings indicate a normal operating
range (green arc) from 400°C to 740°C, caution range (yellow arc) from
741°C to 790°C and a red radial line at >790°C (max takeoff ITT). If the ITT
is >790°C for greater than 2 seconds, the title, pointer, and digits ash red.
When the ITT is between 741°C and 790°C, the title, pointer, and digits are
amber. Otherwise, the title and pointer are white and the digits are green.
Figure 7-65 – ITT Indicator
Engine Start
200°C to 925°C 926°C to 1090°C >1090°C
400°C to 740°C 741°C to 790°C >790°C
Normal
Operation
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