Powerplant and Related Systems - NATOPS CH 2.1 Flashcards
What is the name of the engines?
T700-GE-401C
What are the five sections of the engine?
Inlet, compressor, combustion, turbine, exhaust
How is inlet cowling air heated?
Fifth stage bleed air flowing into inlet cowling, and heating the exposed inlet surface through small perforations.
What do the swirl vanes do?
Impart rotation to the airflow at the intake.
Why are the swirl vanes hollow?
Anti-icing by fifth stage bleed air
What is the IPS?
Inlet Particle Separator
Particles are thrown outboard after the rotation is imparted to the air, into the collection scroll and then dumped overboard by the blower assembly.
What removes the rotation from the air to provide smooth airflow to the compressor?
Deswirl vanes
What type of compressor do we have?
Five stage axial, single stage centrifugal.
What type of combustion chamber do we have?
Flow through, annular
How many igniters per engine?
2 igniters
How many injectors per engine?
12 injectors
How do the injectors receive fuel?
Via the ODV
What two components does Ng drive?
Compressor and AGB
How many stages is Ng?
Two stage, air cooled, axial design
What does Np drive?
The power turbine drive shaft
Explain the Ng and Np shafts.
They are coaxial, with Np turning inside of Ng.
Explain the connection from Np to the transmission.
Np turbine drive the Np shaft, which extends forward and connects to the high speed shaft, which in turn connects to the input module.
Where is TGT sensed?
In between the gas-generator and the power turbine (Ng and Np).
How much airflow is used for combustion? What is the rest used for?
30%
Inlet temp (T2)
Discharge px (P3)
Combustion and turbine cooling
Engine oil seal pressurization
What provided gas generator control? What controls power turbine load?
HMU provided Ng control. EDECU trims the HMU to satisfy Np load requirements.
What does the engine control quadrant consist of?
PCLs
Fuel selector levers
Engine T handles
Rotor brake interlock
What are the four positions of the PCL?
OFF - IDLE - FLY- LOCKOUT
What is happening with the PCL in the off position?
The Power Available Spindle (PAS) is mechanically shutting off fuel at the shutoff valve in the HMU.
What is lost and what is retained in LOCKOUT?
TGT limiting, load sharing, and Np governing are lost.
Np overspeed protection is retained via a direct link between the EDECU and ODV.