Chapter 3 - Power Plant Flashcards
What does an engine front mounting consist of?
Torque tube
What loads does the torque tube carry?
Horizontal and torsional
Where is most of the engine weight carried through?
The rear mountings
How many engines are there on a Mk4?
3
No. 1 & 2 on the left, No.3 on the right
Name the 6 Modules of an engine
Module 1 - Air Intake and Compressor Module 2 - Combustion Chamber and Gas Generator Module 3 - Power Turbine Module 4 - Drive Shaft and Torque Meter Module 5 - Accessories Gearbox Module 6 - IPS
What does IPS stand for and what does it do?
Inlet Particle Separator
Uses centrifugal force to remove the unwanted particles from entering the engine and expels it through the exhaust and allows clean air to enter.
What does Module 1 provide?
Intake controls the air flow entering the engine
Compressor compresses air so it is suitable for combustion
Module 1 provides mounting for module 5 & provides LP air for air start system, ECS and compressor wash
What does Module 2 provide?
Stabilises airflow
Mixes air with fuel and combusted
Provides hot air for anti-icing
What does Module 3 provide?
Extracts power from the exhaust gases and transmits it to an output shaft
Provides HP air for the IPS
What does module 4 provide?
Transmits the rotation of the power turbine through the engine to the MGB
Torque meter measures the torque transmitted through the power output shaft
What does Module 5 provide?
Provides speed reduction for the accessories mounted to it
What does Module 6 provide?
Removes unwanted damage from entering the engine
Anti-icing supplied from Module 3
What does FCOC stand for and what does it do?
Fuel Cooled Oil Cooler
Acts as a heat exchanger, cooling the oil by passing cold fuel over the top via pipes
Where is the FCOC located?
Mounted on the accessory gear box
What does the oil pump do and where is it located?
Pump maintains the pressure and supplies the oil to the lubrication system
Located on the accessory gearbox
Where is the alternator located?
On the accessory gearbox
Where is the air starter motor located and what does it do?
On the accessory gearbox
rotates the power plant and then disengages at self-sustaining speed
What types of fuel pumps are there and what do they do?
LP Fuel pump - boosts fuel delivery to the HP pump
HP Fuel pump - boosts delivery pressure before entering the power plant
What does the gas generator speed probe do?
Senses the gas generator speed (Ng)
Where are the spark igniters located and what do they do?
Located at the rear of each power plant
Ignite fuel and air mixture during start sequence
What are the major accessories of an engine?
Gas generator speed probe
Spark igniters
Fuel pumps
Air starter motor
What are the major oil components in an engine?
Oil Sump Oil Filter Oil Pump Chip detector Mag plug x3 Fuel Cooled Oil cooler Pop out indicators Sight Glass Oil Jet Oil Temperature probe
What are the major fuel components on the engine?
Fuel Filter Fuel Pumps Pop out indicators Fuel Cooled Oil Cooler Fuel Jets
What are the major air components in an engine?
Anti-Ice valves VIGV Actuator Air starter motor PSV - pressurising start valve Bleed valve
What are the major electric components on an engine?
EECU
HEIU
Spark Igniter
LP/HP Switches
What does HEIU stand for?
High Energy Ignition Unit
What does EECU stand for?
Electronic Engine Control Unit
How many engine thermocouples are there and where are they located?
7
Located at the rear of the engine
Where are the air scoops located?
One on top and one on the side of each cowling
What does an IPS Diffuser do?
Slows the dirty air exiting the IPS and directs it towards the exhaust
What does exhaust design and engine bay scoops allow for?
Enough airflow to ensure a cooling effect around the engine and reduces a risk of fire
What is the nozzle assembly that straightens the airflow and is fitted to the exhaust called?
Anti-Swirl vanes
What are firewalls?
Fireproof casing around the engine
What are firewalls made of?
Titanium
What is special about the outboard top section of an engine bay firewall?
It is removable for access during engine installation/removal
What are engine drains used for and where are they located?
Carries away leaked fluids
Located at the bottom of the engine
What are engine wet drains?
Wet drains contain fluid as part of the normal operating cycle
What must be done in relation to fuel drain tanks after each AF inspection?
Must be emptied
Why are compressor washes necessary?
To ensure that the engines are maximum efficiency and FOD and dirt build up is removed from inside the engine
When are compressor washes done?
When the aircraft endures environmental damage to the engine
When the engines show a significant difference in the efficiency of each engine
How do you know if the engine is not as effective?
Information given through the PPI - Power Performance Index
Visual inspection of the engine
What is HUMS?
Health and Usage Monitoring System
How much shaft horse power does each power plant provide?
2000 - 3000 shaft horse power
How much shaft horse power is the MGB limited to and how does it allow for this?
A combined input of 5200 shaft horse power
Controlled by FADEC system
What is an RTM 322?
3 stage axial flow compressor
Centrifugal compressor
2 stage axial flow high power turbine
2 stage power turbine
