Powerplant and Propellers Flashcards
NTOP Horsepower
2142 SHP
NTOP RPM and Torque
1200 (max 1212), 92% TQ (90 in air)
NTOP Nh and ITT
101% Nh, 765deg ITT
Can you exceed the NTOP ITT limit?
Yes up to 5degrees for 30seconds
MTOP Hp
2380 SHP
MTOP TQ + RPM
100%, 1200 RPM
MTOP limits
102.7%NH, 800ITT, 105.6%TQ, 1212RPM
How long can you have MTOP set for?
5 mins max
Max continuous power?
90%/1200RPM or 96%/1125RPM or lower. 102.7%NH, 800ITT
Max Transient NH and ITT
103.7%NH and 840deg ITT
Max transient TQ and RPM
115% and 1320RPM
What is the time limit for transient settings?
20Sec unless otherwise stated
Normal oil pressure range?
55-65PSI (60PSI)
When is an oil pressure lower than 55 PSI allowed?
40-55PSI permitted below 75%NH as per QRH
What pressure does the OIL PRESS warning come on?
42 PSI +/-2
What is the action for an OIL PRESS warning?
ENGINE FIRE/FAIL/SHUTDOWN
Memory items for ENGINE FIRE/FAIL/SHUTDOWN
P/L FI C/L off Aux Fx FX T handle PULL Aux pump off
Normal minimum oil pressure?
55PSI
Minimum temp for Unfx?
0deg
What is the normal oil temp range?
45-115deg
What is the significance of the minimum oil temp before takeoff?
Adequate temp for inlet rim anti-ice protection
When do the bypass doors have to be open?
On the ground below 10deg, in the air below 5deg, any visable moisture
When do the engine intake heaters turn on?
Below 15degrees and bypass doors open (w engine running)
What are the engine ITT starting limits?
800+ for 20secs, 840-900 for 12 secs, 900-950 for 5secs
What is the maximum time you can engage the starter for?
1 min
What are the Starter rest time requirements?
1/2/1/2/1/30
If we have an engine failure after take off with autofx armed, how much will the good engine uptrim by?
10% of current TQ
What compressor drives the ACC g/box?
NH
What accesories are driven by the accessory gbox? (Nh)
MFC
OIL PUMP
DC GEN
EDP
What acccessories are driven by the RGB?
PCU Oil pump for the PCU Overspeed gov Hydraulic pump AC Gen
What prevent the P/L from being inadvertantly selected to below FI in flight?
gate + beta warning horn/lockout system (disables at 20ft RAD alt
What is the cockpit indication that an ECU has failed?
10% TQ uptrim on that engine,
ECU manual mode indicated on the ECU
#1/2 ECU MAN Caution
What precautions should you take on approach/landing with an engine in manual mode?
No precise fuel control/HBOV so small or smooth changes in power selection to prevent surge/stall,
No harmonic protection (500-780RPM) so not below disc on LDG,
Assymetric lever position for equal thrust
No auto uptrim if other engine fails
What is the normal position of the ignition switch for engine start?
AUTO
When will the ignitors automatically come on in a normal start?
When start button is pushed
What is the danger of moving the C/L above fuel off on the GND?
With any residual NH and ignitors in AUTO, ignition will activate as Nh below 60% with C/L forward of fuel off
If electrical power is disconnected from an instrument what will the gauge indicate? what about the hydraulic gauges?
0 and the screen will go blank,
hydraulic gauges are AC powered so will indicate the same as before they failed
What is the prop range in flight?
900-1200
What provides overspeed protection?
Overspeed governer at 1250RPM
Pnuematic fuel cut at 1308RPM
What are the memory items PROP OVERSPEED?
Synchrophase off P/L FI Reduce airspeed C/L Start/Feather Alt FX, FX If FX - ENG SHUTDOWN If no FX - Alt fx off C/L max P/L As req not above 1212rpm land at nearest suitable airport.
Where does the PCU get its oil from
RGB oil pump
What happens to the prop if there is a loss of oil pressure?
Pitch lock (1deg,2% RPM increase) towards fine.
how is blade angle set in beta range?
with the P/L
What RPM range is prohibited?
500-780?
What is the Beta Back up system? How would you know it was operating and what can you do about it?
Prevents blades from reducing into ground beta in the air due to a linkage malfunction. The Ground range lights would be flashing/cycling.
advance the P/L to bring blade in alpha range
When will the AUTO FX arm?
When selected AND
P/L both in T/O position,
both TQ above 38%
When will auto Fx activate?
When selected.
When both P/L are still in the T/O position but one TQ is above 38% and one below 28%.
After a 3 second delay.
How long is the Auto fx time delay?
3 seconds
How do you deactivate auto fx?
bring both P/L to idle or press the auto feather button (like for setting climb power)
What system protects the prop and power tubine if the P/L is selected to below F/I in flight?
Beta Lockout system
If the LH prop was cycling around 1000rpm after T/O, what has happened? what will the QRH say to do?
LH P/L position microswitch failure
Reduce prop to 900 in climb to check it stops oscillating
Once energised the Ax fx pump runs for how long?
18 secs
Is Auto power uptrim available if auto fx is disarmed
no
During which phase of flight is synchrophase used?
All except T/O and LDG (cannot be used at 1200rpm)
What range should the props be within before the synchophase is activated?
within 20rpm of each other
Minimum Nh to turn fuel on for start?
10%
Memory items for APU fire?
Confirm auto shutdown and extinguish,
if needed manually activate bottle
Is the prop and power turbine connected to the gas turbine?
No (free power turbine)
Where is ITT measured?
after Nh turbine, before NP
When should we open the bypass doors?
below 10deg on the ground with any visable moisture, below 5deg in the air with any visable moisture.
prescence of sluch snow ice etc on taxiways
When does heated oil begin to circulate around the engine intake?
No req, it constantly circulates just needs 45deg oil to be effective.
How fast (approximately) does the NH turbine spin in normal operation?
33000RPM
When are the only 2 times the ignitors are on?
Start and relight (below 60%Nh in flight)
What is the self sustaining Nh?
66%
Where is the Fire detection and suppression located in the engine nacelle?
Fuel nozzles back
What is the reduction ratio of the RGB?
16.6:1
Can we use reverse thrust with an ECu in manual mode?
No (no harmonic protection)
What is the approximate fuel pressure at 6% Nh?
100PSI
What is the Fuel Pressure after the EDP?
980PSI
When will the ignition activate if set to manual mode?
Continuously
Approximately what Nh value will the oil pressure rise? why?
35%
This is approximately when the labrinth seals on the hot side of the engine seal
Oil pressure start limit?
200PSI
Min temp for a prop unfeather?
0 degrees
Prop diameter?
4.12m
Approximate Pressure of fuel before the EDP?
20PSI
How much oil does the feathering pump have in reserve for its operation?
1.6L
What does a green light on the auto fx mean?
Sensor is recieving pressure in the system
Below what RPM can we consider a prop feathered?
300 and reducing
What would be the indication of an unscheduled feather?
High Torque with low and/or reducing RPM
What should you do in the event of an unscheduled feather?
ENG FAIL/SHUTDOWN
How does the pnuematic governer limit RPM?
By reducing fuel flow to MFC, starting at 1308 RPM
What are all the functions of the ECU?
Fine fuel control
Compressor surge/stall protection
Harmonic range protection
Power up trim
Obv control
When do both beta back up and lock out become available on take off?
WOW and 50ft RADalt
