Engines day 4 Flashcards
How many N1 speed sensors are there?
Two. One sensor and the alternator
What measures the gas generator rotating speed?
The N1 sensors
Where are the N2 sensors located?
in the reduction gearbox
What is the purpose of the engine indicating system?
to be sure that the engines are operating in the proper limits
How many N2 speed sensors per engine?
3
What measures the power turbine rotation speed?
the N2 sensors
Where are the N1 sensors located?
on the alternator driveshaft
Which are the main components of the torque meter?
a reference shaft, output shaft, phonic wheel
What is the temperture of the combustion gases on the exhaust system?
660 C
What is the function of the exhaust system>
The exhaust system continuous the expansion phase of the engines gas cycle and expels the gases overboard to atmosphere
What is the function of the heat sheild in the exhaust system?
One to protect the battery, one to protect the gearbox.
How many strainers in each of the oil systems?
- One per scavenge line.
What is the purpose of the check valve in the oil system?
to prevent the oil going from the cooler to the engine
What is the oil consumption of the Arrial 2E?
0.1-0.2L per hour
How many oil pumps are on each engine?
- 1 Px, 3 scavange.
Where are the engine oil pumps driven from?
the N1 drive
What are the external oil pipes made from?
stainless steel
Where is the oil check valve located?
downstream of the scavenge pumps
If the engine is stopped, what position is the oil check valve in?
closed
What is the function of the oil strainers?
to protect the scavange pumps from large particles of metal
The oil filter pre-blockage indication will be visable when?
on the FND on the ground
If a filter blockage was detected, what indication would be given?
an amber caution
Where is the starter electro valve installed?
the engine
Where is the starter generator installed?
on the engine
When will the starter/generator move into generator mode?
at 61% N1
What are the functions of the starting system?
starting ventilation, ignition & overheat protection
What indication will a starter overheat give?
an amber caution
at the end of the start, what speed is acheived for idle?
78% N2
When N1 reaches 61%, what happens at the starter generator?
the starter contactor opens, cutting electrical supply to the starter gernerator and the starter generator starts to operate in generator mode.
Where is the EDR powered from?
the aircraft electrical system
Can an EDR be swapped with a different engine?
No, it must stay with it’s engine over it’s entire service life
What is the exhuast pipe made from?
stainless steel
What type of sump is the engine?
a dry sump laid out for synthetic oil
What is the volume of oil the oil tank can hold?
5.5litres
What speed is the ignition relay de-energised?
30% N1
What controls the starter and generator modes?
the GCU
