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124 Cards in this Set
- Front
- Back
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Brief electrical system description. |
- 28V DC system -Power supplied through 2 general buses, 2 avionics buses and a battery bus. -Standby electrical system also included uses an engine driven alternator and seperate busing system. |
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Maximum Torque on Takeoff |
1865 Lb/Ft |
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Max ITT on Takeoff |
805°C (>765°C limited to 5 min) |
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How long can you have ITT >765°C? |
5 minutes |
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Maximum Climb Torque? |
1865 lb/ft |
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Max Climb ITT? |
765°C |
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What is the max Ng? |
101.6% |
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Max Continuous Torque? |
1865 lb/ft |
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Max Cont ITT? |
805 (>765°C limited to 5 min) |
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Max Idle ITT? |
685°C |
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Normal Oil Pressure |
85 psi to 105 psi |
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Minimum Oil PSI? |
40 psi |
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Ng at Low Idle? |
52% |
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Ng at High Idle? |
65% |
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How much Shaft Horsepower does the PT6-114A produce? |
675hp |
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Max Transient Torque? |
2400 ft/lb |
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Max Transient ITT |
850°C (limited to 2 seconds) |
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What is the limitation on the prop RPM and using the max SHP? |
At 1865 ft/lb or greater of torque, Prop RPM should be at 1800rpm or lower |
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Beta range is available for how long? |
Limited to 1 minute |
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What is Ng? |
Ng is the speed of the gas geneterator turbine measured in percentage. The max is 101.6 |
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What is Np? |
Np is the speed of the power turbine which spins the propellor. It goes through a 2 stage planetary reduction gearbox. |
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Engine Starting Cycle Limits (on battery) |
30 sec on, 60 sec off / 30 sec on, 60 sec off / 30 sec on, 30 min off |
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What does the Voltage Low (red) light mean? |
Electrical System Bus is low and being supplied by the BATTERY |
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What does the Vacuum Low (red) light mean? |
The vacuum system is below 3" Hg |
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What does the Oil Pressure Low (red) mean? |
Engine oil pressure is less than 40 psi (+\- 2) |
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What does the Resevoir Fuel Low (red) light mean? |
Fuel in the resevoir tank is less than one half full |
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How much time do you have in fuel when the Resevoir Fuel Low announciator light comes on? |
Approx 90 seconds |
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Generator Off announciator light (red) comes on when: |
Indicates the generator is not connected to the Power Distribution Bus |
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Left Fuel Low announciator light (amber) indicates: |
Indicates fuel quantity in the left tank is less than 25 gallons (95L) |
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The Emergency Power Lever (red) announciator light illuminates when: |
The emergency power lever is advanced out of the NORMAL position |
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When will the Right Fuel Low (amber) announciator light illuminate: |
When the right fuel tank is below 25 gallons (95L) |
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When will the Auxiliary Fuel Pump On (amber) announciator light illuminate: |
When the Aux Fuel Pump is operating. |
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Fuel Pressure Low (amber) announciator light illuminates when? |
Fuel pressure falls below 4.75 psi |
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Starter Energized (amber) light illuminates when? |
The starter-generator is in starter mode |
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When will the Fuel Select Light (red) announciator light illuminate: |
When one or both of the fuel selectors are off |
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Ignition On (green) announciator light illuminates when: |
Electric power is being supplied to the ignition system |
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De-Ice Pressure (green) announciator light will illuminate when? |
The pressure in the de-ice boot system reaches 15 psi |
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Windshield Anti-Ice (green) announciator light will illuminate when? |
Power is being supplied to the windshield anti ice relay |
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Standby Electrical Power INOP (amber) will illuminate when: |
Electrical power is unavailable from the STBY Alternator |
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Chip Detector (amber) announciator light will illuminate when: |
Metal chips have been detected in the Reduction Gear Box (RGB) or Accessory Gear Box (AGB) |
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Door Warning (red) will illuminate when: |
The upper cargo door and/or upper aft pax door are not latched |
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How many amps does the starter-generator produce: |
200 amps |
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How many amps does the STBY Alternator provide: |
75 amps |
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What is the normal operating range (green arc) for the prop: |
1600-1900 RPM's |
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Max Prop RPM? |
1900 RPM |
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Max ITT on Start Up? |
1090°C |
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Max Cruise ITT? |
740°C |
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Max Reverse Torque? |
1865 ft/lb |
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Max Oil Pressure: |
105 psi |
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What is the normal operating range for oil temp (green arc): |
10°-99°C |
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What is the Oil Capacity? |
14 quarts |
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How many quarts of oil are in the Oil Tank? |
9.5 quarts |
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Max Takeoff Flaps? |
20° |
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What is the max demonstrated crosswind? |
20 kts |
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How many fuel drains are on the C208? |
8: 3 per wing, 1 fuel resevoir, 1 fuel pump drain resevoir |
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Total Fuel? |
335.6 gallons (167.8 per tank) 1270 Litres 635L |
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Total Useable fuel? |
332 gallons (166 each tank) 1256 Litres 628L |
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How many electrical buses are on the A/C? |
7. 1 Power Distribution Bus, 2 General Buses, 2 Avionics Buses, 1 Battery Bus, 1 Standby Power Bus |
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How many fuel pumps are onboard? |
3. The main ejector pump, engine driven fuel pump, and the Aux DC Pump |
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How are the spoilers used on the A/C? |
To assist turning at low airspeeds. They automatically deploy on the low wing in the turn at aprox 5° aileron |
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Why is P2.5 air bled during low Ng speeds? |
Because axial flow compressors are too efficient at low speeds for the impellor. The 2.5 bleed valve bleeds air at low Ng to prevent compressor stalls |
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Where does bleed air come from? |
P3 |
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Where do the gyros and de-ice boots get their air? |
P3 bleed air |
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What kind of compression does the PT6-114A incorporate? |
A 3 stage axial flow compressor and 1 centrifugal compressor/impellor |
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What does the Centrifugal Compressor do? |
Spins air into diffuser vanes that lead to the combustion can |
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What air does the Fuel Control Unit use? |
P3 bleed air |
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What happens to the Fuel Control Unit if P3 air is lost? |
The fuel control unit will roll back to idle. The Emergency Power Lever must be used. |
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How does the inertial seperator work? |
In bypass, the forward vane closes and the back vane opens, allowing ice particles and FOD out of the side (Heavier particles can't make the turn) |
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Where is the starter-generator located? |
The back of the accessory gearbox |
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Where is the belt driven STBY alternator run off of? |
A belt off one of the scavenge pumps |
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How many stages of planetary gear reductions are in the RGB? |
2. The first takes 33,000rpm to 6,600rpm. The 2nd takes the 6,600rpm to 1600-1900 rpm |
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How is torque measured for the gauge? |
A stationary ring with slanted grooves on the 1st planetary rings. As power is increased, the ring moves backwards on the grooves, pushing on a valve that allows more oil on a piston which the gauge reads. |
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When will the fuel selector valve warning horn sound? |
Both selectors off. One off, starter on. One off, fuel below 25 gal in the other. |
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How many fuel nozzels are in the combustion can. |
10'primary, 4 secondary |
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Maximum fuel imbalance inflight? |
200lbs |
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What buses does the STBY Alternator connect to? |
Both general buses via Circuit Breaker and the Avionics Bus 1. To connect to Avionics Bus 2, open the Avionics Bus Tie |
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How does the overspeed governor work. |
At 104% Prop rpm (1976) the flyweights open on the govenor, pushing on the beta valve, allowing oil out of the prop hub, increasing the prop pitch |
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How does the Nf Governor work? |
At 106% SELECTED Prop RPM, the govoernor (just like constant speed) restricts fuel at the FCU to prevent overspeeds in BETA range |
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Minimum airspeed in icing? |
120 kts |
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When will the Low Airspeed Announciator illuminate? |
When airspeed is less than 110kts and the prop heat is armed |
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Vso? |
50 kts |
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Vs? |
63 kts |
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Vx? |
72 kts |
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Vy? |
104 kts |
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Vfe flaps 10 |
175 kts |
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Vfe flaps 20 |
150 kts |
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Vfe Flaps 30 |
125 KTS |
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Vne/Vmo |
175 kts |
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Vr? |
75 kts |
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Normal Takeoff Climb Speed (profile) |
95 kts until 400ft AGL, above 95 kts go flaps 10, above 105 kts go flaps 0, accelerate to cruise climb 110-120 kts |
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Engine Failure Immediately after T/O speed |
85kts & Flaps 20 |
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Steep Turns airspeed |
130 kts |
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Visual Landing Profile |
Wing Flaps 10 at pattern entry and airspeed 120 or below. Abeam TD point, 100 kts. Base turn airspeed 90 and flaps 20. Landing assured and on centerline: 80 kts and flaps 30 |
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Maximum Takeoff Weight |
9062 lbs (4110kg) |
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Maximum Landing Weight |
9000 lbs (4082kg) |
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Zero Flap Landing Speed |
100 kts |
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Max Accidental Door Open Speed |
100 kts |
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Minimum Airspeed for Airstart - No Starter Assist |
100 kts |
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How does the FCU work? |
The power lever is connected through linkage to a cam assembly on the front of the FCU. The FCU uses P3 air to modulate the flow of fuel to the Engine |
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Go Around Procedure: |
Takeoff Power. 8-10° pitch up. Flaps 20. Airspeed 95kts (minimum). |
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Describe the path oil takes: |
Oil is drawn from the bottom of the oil tank where it passes through a filter screen and then a pressure relief valve for regulation of oil pressure, it then goes to the main oil pump to the oil filter, it then is routed to bearings, reduction gears, accessory box, torquemeter, prop gov, and fuel heater. After cooling and lubricating, oil is returned to the tank via gravity, internal scavenge pump, or external scavange pump. |
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Describe the fuel system |
Consists of two vented integral fuel tanks with shutoff valves, a fuel selectors off warning system, a fuel resevoir, an ejector fuel pump, an electric aux fuel boost pump, a resevoir manifold assembly, a firewall shutoff valve, a fuel filter, a fuel heater, an engine driven fuel pump, a fuel control unit, a flow divider, dual manifolds, 14 fuel nozzles |
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What is inside each fuel tank? (Fuel system) |
3 drain valves, a vent with float valve and pressure relief valves, a float type fuel quantity transmitter, a fuel low switch, a filler cap, a fuel selector off warning relay assembly. Both lines that run to the resevoir have a shut off valve, fuel selector off warning switches, and screens |
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Takeoff Callouts |
Prop to the stops. Power Set. Airspeed Alive. Engine Instruments Normal. Fuel Flow ~450pph. |
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Engine Emergency Memory Items |
Ignition on. Booster Pump on. Fuel Selectors on. |
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What does the starter-generator incorporate? |
A speed sensor for overspeed protection and an automatic starter shutoff |
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How would you recognise that you have a stuck starter? |
The 'Starter Energized' light staying on above 46% Ng. |
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How would you recognise that you have a stuck starter? |
The 'Starter Energized' light staying on above 46% Ng. |
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What do you do if you have a stuck starter? |
Make sure the start switch is off, then immediately turn battery switch to off and condition lever to cut-off. |
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How would you determine an ignition failure during start? |
Engine fails to spool up after adding fuel via the condition lever. |
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What should you do if you have an ignition failure at start up? |
Start switch to motor and condition lever to cut off. Cycle the ignition CB |
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How would you recognise a hung start? |
The Ng will hang around 35-40% Ng. |
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How would you recognise a hung start? |
The Ng will hang around 35-40% Ng. |
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What actions should be made in the case of a hung start? |
Condition lever to cut-off Start switch to motor |
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What could cause a hot start? |
-weak battery (<24V) -bleed air switch on -emergency power lever not stowed in the normal position |
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What should you check if nothing happens when you flick the start switch to start? |
-check the start contact CB on the top row about half way over. -check the guarded external power switch and ensure it is off. |
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What do you do if nothing happens when you push the battery switch to on? |
-Check the battery is connected. -Check the battery CB inside the left cowling. |
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How would you identify a compressor stall just after start? |
A very loud bang or back firing. |
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How would you identify a compressor stall just after start? |
A very loud bang or back firing. |
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What would be an indication of a compressor bleed valve failing to open? |
A decrease in available torque and reaching the ITT temp limit sooner then normal. |
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How would you identify a compressor stall just after start? |
A very loud bang or back firing. |
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What would be an indication of a compressor bleed valve failing to open? |
A decrease in available torque and reaching the ITT temp limit sooner then normal. |
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How would you recognise that the compressor bleed valve is stuck open? |
Abnormally high ITT and fuel flow during take-off roll. (Reject the take-off) |
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What is a trick that you can use in any aircraft if your static system stops working and so does your alternate static? And what do you need to be wary of? |
You can break the glass on the VSI but be careful as it will read reversed. ie. climb indication is actually a decent |
