Powerplant (71) Flashcards
What can be seen on the PFD & MFD with regards to Engines?
PFD - PI(Tq), NF, NR, ENG Oil T’s/P’s
What engines are fitted?
PW210-A
How is engine mounted?
2 x stainless steel mounts
1 x titanium torque tube
What is the Central Support and Engine cowlings made from?
Titanium
(for fire protection)
What are the exhaust lateral and exhaust central cowlings made from?
Composite material
What are the sections of the Engine?
- Reduction Gearbox
- Compressor
- Combustion Chamber
- Turbine
How is the speed from the PT reduced to a useable output?
Via single stage reduction gear
How is the engine accessory gearbox driven?
Via the Compressor Turbine (CT).
Where is the Np/Tq sensor fitted?
Outside of the Accessory Gearbox
How many stages in the compressor?
2
(1 Axial)
(1 Centrifugal)
TITANIUM
What is the purpose of the Variable Inlet Guide Vanes (VIGVs)?
To maintain the efficiency of the compressor.
How are the VIGVs controlled?
Via the FADEC
How is the Power Turbine (PT) temperature regulated?
Via P3 air
How are the Compressor Turbine (CT) blades attached?
Fir Tree serrations
How many Power Turbines are there?
2
How is exhaust gas temperature monitored?
8 Thermocouples mounted in the turbine exhaust
Where is the Engine Fuel Control Unit (FCU) mounted?
Mounted and driven by the Engine Reduction Gearbox
Where is fuel flow measured?
Via the FCU
Where is the Permanent Magnetic Alternator (PMA) for the engine installed?
Within the FCU
Is there bypass functionality within the fuel filter?
NO
Could result in an Engine Out condition
Where is the Fuel Oil Heat Exchanger Fitted?
On top of the RGB.
WHat is the purpose of the Fuel Flow Divider
To divert fuel to the primary and secondary manifolds
enables rapid and cooler engine starts
What happens to fuel drained form the fuel flow divider during engine shutdown?
It is used during the next engine start
How many fuel nozzles are there?
13
10 duplex, 3 simplex
What component is the primary means for engine shutdown?
What can be used in an emergency?
- The metering valve (needle)
- In an emergency the FIRE ARM or EDCU can be used
What is the purpose of the stepper motor within the FCU?
Controls the metering valve
What is the purpose of the start exciter and what is its output?
Converts low voltage aircraft electrical bus to high voltage
3,000Vdc
How many and in what position are the spark igniters?
- 2
- 4 & 8 O’clock position
How do the igniters behave on the ground and in flight
(3)
ON GROUND
One igniter (unless one fails then the other will initiate)
IN AIR
Two igniters
When does Ignition drop off during engine start?
50%Ng
What powers the VIGV Actuator?
The engine PMA
What redundancy is built into the EECUs?
Each EECU is dual channel
What powers the EECUs?
NORM:
- PMA within the FCU
START and BACKUP:
- Channel A - EMER
- Channel B - ESS
What is the purpose of the Rotary Variable Differential Transducer (RVDT)?
Provides position of the collective to the EECU
What is the purpose of IDLE APU on ENG1?
Drives components attached to the Accessory Gearbox
What happens if the ACC Actuator fails to engage within 10 seconds?
[APU MODE FAIL] Caution
To ENGAGE #1 to MAIN from APU
(MAIN SELECTION)
- # 1 IDLE/APU, #2 FLT
- # 1 OFF, #2 IDLE/FLT
To DISENGAGE #1 from MAIN to use as APU mode…
(ACC SELECTION)
- # 1 OFF, #2 OFF/IDLE/FLT
- # 1 IDLE/APU, #2 FLT
Is it possible to re-clutch engine #1 to the main rotor with both engines off?
NO
What happens when OEI TRG is selected?
OEI TNG indicates on the PI
What does a flashing 2.5m indicate on the PFD?
That the 2.5m OEI will expire within 10 secs
What does pressing the AEO LIM SEL do?
Selects between LOW and HIGH Torque Limits
What is the Take off Power (TOP) time limit?
30 mins
What 3 fault categories are associated with the EECU?
- Minor (No CAS)
- Degraded (Caution + ENG SYnoptic)
- Major (Warning + behaviour)
What is a fail Idle condition in the EECU?
[1(2) EECU FAIL]
Major fault where the engine reverts to IDLE to keep the associated generator online
What is a Fail Fixed condition on the EECU?
[1(2) FAIL FIXED]
MAJOR fault where the fuel metering valve is maintained at a fixed position
Where are EECU Degraded faults displayed?
[1(2) ENG DEGR]
MFD Engine Synoptic page
What provides Ng?
Permanent Magnetic Alternator (PMA)
What do the EECUs cross-talk for?
(3)
- OEI Detection
- Engine Matching
- OEI Training
How many thermocouples are fitted for ITT and what is the signal called?
- 8
- T6
When will a yellow NR symbol be posted?
NR miscompare (>3% difference between EECU1 & 2)
What does [1(2) FUEL FILTER DEGR] signify?
Impending blockage
What are the starter duty cycles?
On of the following 3 times…
- 45s on, 10m off
- 30s on, 5m off
- 15s on, 2m off
Then 30 mins off.
Can the ENG oil filter be bypassed?
YES
Where is the Air Cooled Oil Cooler (ACOC) located?
Fwd section of the Engine RGB
What is the purpose of the thermal bypass in the Air Cooled Oil Cooler (ACOC)?
For oil to bypass the matrix when <54°C
What are the 2 methods to burn a chip?
- EDCU
- MFD Bezel Key
What does [1(2) ENG OIL FILTER] signify?
Impending oil filtration bypass
Where is the Engine Oil pump located?
Within the Engine RGB
What is the primary purpose of the engine oil?
To lubricate the engine bearings
Where is the engine chip detector located?
At the bottom of the RGB
What causes [1(2) ENG OIL TEMP]?
Oil temp >135°C
What drives the APU actuator to DISENGAGE ENG1 from the MAIN?
Electrical motor
What state must ENG2 be at when configuring for APU mode?
HIGHER STATE
What is the max starting temp?
- 750°C
- 825°C transient
Is there HOT START protection whilst in the air?
NO
How is oil distributed throughout the engine?
- Single pressure pump
- 3x scavenge pumps
