ELO C Engines Flashcards
General Electric T-701C/D Series Engine Operational characteristics
Type: turboshaft, axial flow
Front drive, turbo shaft engine constructed in Four Modules: Accessory Section, Hot Section, Cold Section, Power Turbine
PCL Settings
(1.) OFF
(2.) IDLE
(3.) FLY
(4.) LOCKOUT
IPS Blower
high-speed blower that suctions small particles from the swirl frame collector scroll and blows them overboard to prevent FOD from entering the engine.
Accessory Module Front Components
Fuel filter, liquid to liquid cooler, engine driven fuel boost pump, chip detector, oil filter, oil pump, alternator, oil pressure sensor, oil temp sensor
Fuel Filter
an impending bypass indicator button and a bypass switch which illuminates the #1/#2 FUEL FLT BYPASS / FUEL 1/2 BYPASS caution lights when the filter becomes fully clogged.
liquid to liquid cooler
a liquid to liquid heat exchanger that uses fuel to cool the engine oil and engine oil to preheat the fuel
Chip detector
monitors scavenge oil stream for metallic particles, illuminates the CHIP #1/#2 ENGINE / CHIP ENG 1/2 caution lights. No Fuzz Burn-off feature.
Oil Filter
has an impending bypass indicator button and a bypass switch which illuminates the #1/#2 OIL FLTR BYPASS / ENG 1/2 OIL BYPASS caution lights when the oil filter is nearly/fully clogged
Oil Pump
a pump that pumps/scavenges engine oil through six scavenge screens.
Alternator
forwards an Ng tachometer signal to the cockpit, supplies electrical power to the engine ignition, and the DEC/EDECU.
Oil Pressure Sensor
transmits oil pressure to the cockpit, the #1/#2 ENGINE OIL PRESS / ENG 1/2 OIL PRESS caution lights illuminate when oil pressure is low
Oil Temp Sensor
transmits oil temperature to the cockpit, the #1/#2 ENG OIL TEMP / ENG 1/2 OIL HOT caution light illuminates at 150º C
Accessory Module Rear
Start, HMU, ODV, IPS
Accessory Module Rear
a pneumatic starter is powered by bleed air typically from the APU. Starter limitations exist because the bleed air powering it is hot and can damage the starter if exposure time is excessive.
Accessory Module Rear HMU
it has many functions, 3 main (pilot controllable) functions include: LDS (collective input), PAS (PCL input), and the Torque Motor DEC/EDECU (engine governor) input].
Accessory Module Rear ODV
protects against overspeed, allows fuel to be sent to the main fuel injectors, and purges fuel after shutdown.
IPS Blower Rear
suctions air particles from the collector scroll and discharges it overboard.
Cold Section Module Sections
High speed shaft, inlet particle separator, compressor, variable geometry actuation system
Cold Section Module- Compressor
Six stage air pump that continuously pressurizes the combustion chamber for combustion and to cool hot section components
*What are the four modules of the T-701C/D engine?
Accessory Section, Hot Section, Cold Section, and Power Turbine
Engine drive shaft links to what
Input module
Cold Section purpose
Catch and compress
Hot section purpose
Fireball
Power turbine section purpose
Send the shit back up
Components of engine fuel system
Engine driven boost pump.
Fuel filter.
Fuel pressure sensor.
HMU.
Oil cooler.
ODV.
Fuel Manifold.
ODV Location and purpose
located on the aft side of the AGB
The ODV has four functions:
Hot start prevention
Overspeed protection
Purges fuel
Sends fuel to 12 injectors
*Which components have a bypass indicator on them?
The oil filter and fuel filter
*What is the procedure for an emergency engine shutdown?
PCLs to off, fuel selector levers to off, fuel boost pumps off.
Turbo shaft engine constructed in four modules
Accessory Section Hot Section Cold Section Power Turbine
Power Control Lever (PCL)
The PCL sets the maximum power that may be called upon It is mechanically linked to the Power Available Spindle (PAS) attached to the Hydromechanical Unit (HMU) via a cable.
Power Available Spindle (PAS)
The PAS is connected to and operated by the ENG POWER CONT lever in the cockpit. (Goes between PCL and engine)
Load Demand Spindle (LDS)
This mechanical link between the collective and the HMU makes fuel scheduling adjustments in a proactive attempt to match engine power to rotor load.
Inlet Particle Separator Blower (IPS)
Blower that suctions small particles and blows them overboard to prevent FOD from entering the engine.
Hydro Mechanical Unit (HMU)
High-pressure pump mounted/driven by the AGB, receives filtered fuel and delivers fuel to the combustion chamber.
Accessory Module location
On top of cold section
Accessory Module Front line replaceable units
Fuel filter, Oil Filter, liquid to liquid cooler, oil pump, and alternator
Engine driven fuel boost pump
designed to suction fuel from the selected fuel cell
Chip Detector
Monitors scavenge oil stream for metallic particles, illuminates the CHIP #1/#2 ENGINE / CHIP ENG 1/2 caution lights. No Fuzz Burn-off feature.
What is the oil temperature sensor and how hot does it need to be for the caution light to illuminate?
transmits oil temperature to the cockpit the #1/#2 ENG OIL TEMP / ENG 1/2 OIL HOT caution light illuminates at 150C.
Accessory Module Rear components
Starter, HMU, ODV, and IPS Blower
The starter powered by what?
a pneumatic starter is powered by bleed air typically from the APU.
HMU main functions (3)
LDS (collective input), PAS (PCL input), and the Torque Motor DEC/EDECU (engine governor) input].
ODV
protects against overspeed, allows fuel to be sent to the main fuel injectors, and purges fuel after shutdown.
High speed shaft
delivers power from the power turbine to the helicopter powerstrain
Inlet Particle Separator (IPS) Blower
Evacuates the remaining dirty air from the collector scroll and discharges it overboard
Compressor
six stage air pump Pressurizes the combustion chamber for combustion and to cold hot section components
Variable Geometry Actuation System
linkage that positions the Inlet Guide Vanes, stage 1 and 2 variable stator vanes, and the Anti-Ice Start Bleed Valve (AISBV). IGV’s and variable stators (stage 1 and 2 variable vanes) are used to manipulate the airflow in the front of those compressor stages. The AISBV opens at low Ng speeds to allow the compressor to accelerate rapidly through its stall range.
Hot section components
Combustion liner and thermocouple harness
Combustion liner
where combustion occurs and energy in the form of “gas pressure “is directed back to act upon two separate turbine sections (Ng and Np). It also houses twelve fuel injectors, and two igniters.
Thermocouple harness
A seven probe harness placed just prior to the power turbine. They measure the temperature of the gasses between the two turbine sections. The thermocouple probes feed temperature data to the DEC/EDECU for TGT limiting function; the DEC/EDECU relays the TGT signal to the cockpit.
Power turbine components
converts gas pressure into rotational shaft energy to power the helicopter drive train
H-60 fuel system components (7)
Engine driven boost pump. Fuel filter. Fuel pressure sensor. HMU. Oil cooler. ODV. Fuel Manifold.
Engine oil tank capacity
capacity of 7 U.S. quarts.
