Engined day 3 Flashcards
Where is the ignition unit located?
On the r/h side of the compressor casing
Where are the start and stop electro valves located?
on top of the centrifugal compressor casing.
Where are the ignitor plugs?
2 o’clock and 10 o’clock of the combustiuon chamber
How many bleed valves are on the engine?
1
What is the engine internal air system used for?
pressurizing labyrinth seals, cooling internal components, and balancing the forces on internal rotating parts
How many volts does the P3 Px Transmitter need?
10V
Where is the T1 temperture probe is installed?
in the engine intake before the axial compressor
What is the function of the T1 temperture probe?
the data provided is used by the EECU to compute the fuel control and engine limits
What is the T1 temperture probe made from?
Platinum
What is the purpose of the bleed air valve?
to bleed excessive P2.4 air to prevent a compressor surge.
Which air tapping is at the outlet of the centrifugal compressor?
P2.6
What purges the starter injectors?
P3 air
What is the purpose of the LVDTs?
to inform the EECU of the position and movement of each collective lever.
What does the ultimate back-up mode do?
enables the operation of the engine, in case of a level 3 failure of the EECU
The metering unit is part of what control?
the engine control
Which system are the starter injectors part of, engine or airframe?
engine components
The principles of limitations are based on what?
N1, TRQ, T4.5
Engine limitations are based on what?
N1, TRQ, T4.5
What engine information will be displayed on the VMD?
N1, N2, TRQ, T4.5
If an engine is lost during flight, what mode will the aircraft enter?
OEI
What N2 speed triggers an OVERSPEED?
120%
The stop electro valve is energised by what?
the start relay
Where is the bleed valve located?
at the axial compressor outlet
Where is P2.4 air bled from?
the centrifugal compressor inlet
Where is P2.6 air bled from?
the centrifugal compressor outlet
Where is P3 air bled from?
the centrifugal compressor outlet after the diffusor
What is the purpose of the P3 Px Transmitter?
used by the EECU for engine control
calculating the fuel required to prevent surge, flame out
conditions, torque exceedances or T4.5 exceedances
What N1 speed are the starter injectors purged?
61%
Can the heating system be used during a EPC/PAC?
No, the EECU inhibits the P3 bleed for heating.
What could cause the Bleed Valve to always be open?
a dirty P3 filter blocking the air to open the valve.
What gives the position signal of the bleed valve?
a micro switch within the bleed valve assembly
Where are the LVDT’s located?
Underneath the transmission deck
What caution would an N2 speed deviation from the NR datum cause?
FADEC N2 DISAGREE and an N2 DATUM set value of 104%
What temperture would cause an automatic shutdown during a start?
T4.5 exceeding 840 C
What RPM is the ignition relay deenergised?
30% N1
What is the idle speed?
78% N2
Where is the engine overspeed protection system powered from?
ESS BUS, not the engine alternator
What is the primary electrical source for the EECU?
the engine alterantor
What speed does the EECU power shift from ESS BUS to the engine alternator?
61% N1
Where is the primary N1 speed information taken from?
the alternator frequency.
