TURBINE OPERATION, INSTRUMENTS, AND MAINTENANCE PP 2

EGT exhaust gas temperature Monitors mechanical integrity of turbine section. Also indicates overall engine operating conditions.

variations of egt Turbine Inlet Temperature (TIT) Probes sense temp at inlet to the power turbine Turbine Outlet Temperature (TOT) Probes sense temp at turbine outlet Interstage Turbine Temperature (ITT) Probes sense temp between turbine stages Turbine Gas Temperature (TGT) Same as TOT, for all practical purposes

Engine indicating and crew alerting system (Eicas) Can be CRT or LCD

Ground operations

Engine starting Know your procedure Use the checklist Know potential problems and their solutions Hot start= ignition occurs when there is an excessively rich fuel/air mixture Monitor TIT or ITT during start If overtemp occurs shut off fuel immediately Hung start= occurs when engine startup is normal and EGT is normal but the engine fails to accelerate Starter released too soon Battery too weak to reach sufficient starting speed

Engine Starting Fire Immediately shut off fuel flow to the engine Motor starter Follow POH procedures

Calculating EPR or discharge pressure

Engine performance Rating Terminology Takeoff power rating= the amount of power that an aircraft engine is permitted to produce during takeoff Maximum continuous power = the amount of power an engine can be allowed to produce without any time limitations Maximum cruise power = the max power for aircraft cruise speeds-can be same setting as maximum continuous power Cruise power = best fuel economy during flight and extended range

Engine performance Rating Terminology continued Maximum climb power = used for normal climb to a cruising altitude, no time limitations on this setting Ground idle = lowest engine speed permitted for ground operations (50%-70%) Flight idle = lowest engine speed permitted in flight- often used for descent, approach, and landing (10% above ground idle) Derated Engine = engine power output is intentionally limited to less than the maximum power that engine can produce

Engine performance Rating Terminology continued Part-throttle engine(flat-rated) = an engine designed to produce takeoff thrust under standard sea-level conditions before the power lever is advanced to the full-throttle position Full-throttle engine = takeoff power is obtained when the power lever is advanced to the full throttle position

Fluid wash

Abrasive grit blast Used for removing heavy engine contamination Engine is run while a specific quantity of grit is fed into the engine

Jetcal Used for checking RPM, EGT, wire resistance, insulation breaks, and various other instruments depending on Jetcal model.

jetcal

Jetcal

Jetcal set up