15.14 EXHAUST GAS TEMP/INTERSTAGE TURBIE TEMPN Flashcards
Why do gas turbine engines require an exhaust gas temperature (EGT) indication
Monitor high temp experienced by turbine engines to prevent thermal damage
Where is the highest temperature located
- directly behind combust chamber
Explain turbine inlet temp
- hot gas hits high pressure turbine
Explain the exhaust gas temperature (EGT) indicator
- shows average temp measured by the individual thermocouples
Explain turbine inlet temperature
- visual indication at instrument panel of the temperature of gases entering the turbine
Explain performance indications
- also known as primary indications
- monitor performance, limits of engine, and set thrust for different flight phases
Explain system indications
- also called secondary indications
- monitor oil or fuel systems
- also used to detect malfunctions quickly
Explain engine trend monitoring
- done on ground to detect engine problems at an early stage
- Uses engine parameters that are automatically recorded by aircraft condition monitoring system (ACMS)
What are the 2 engine performance indications
- rotational fan speed (N1)
- Engine pressure ratio (EPR)
Explain engine system indications (secondary engine indications)
- monitor correct operation of engine systems
E.g. for oil system -> monitors quantity,pressure temp etc
Advantage of engine trend monitoring
Alerts operator to a problem at an early stage
To determine EPR, where are the measurements taken from
- engine inlet
- and turbine exhaust
What does it mean if there is a AMBER/RED line indication on EPR DISPLAY
- shows maximum available thrust
What does the BLUE circle show on EPR display
- corresponds to the actual throttle position
Explain flexible take-off
- uses minimum thrust possible to take off depending on ambient temperature
- reduces engine wear