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Cessna 208 Study Guide/Checkride
What is P3 air used for? Main one? - โ โ โข PT6A-114A, Reverse flow, free turbine, 3 stage axial, 1 stage centrifugal compressor 7: compression ratio
- Flat rated to 675 SHP at 1865 ft-lb. and 1900 RPM
- 14 simplex fuel nozzles, 10 operate for initial start; 14 after 30-35% Ng
- 101.6 Ng = 38,100 RPM
- Power turbine speed is 33,
- Moving into BETA range while prop is feathered can damage prop- reversing linkage
- Torque meter uses a ratio of engine oil pressure to reduction gear oil pressure to operate
- P2.5 bleed air exits axial stage through compressor bleed valve, can be diverted to the cabin for supplemental heat or defog on ground only
- P3 bleed air is used for every other system on the plane What OPSPEC allows us to fly IFR into Class G airspace? What are the four things you need to do it? - โ โ OPSPEC- C
- The airport is served by an authorized instrument approach procedure.
- The airport has an approved source of weather.
- The airport has a suitable means for the PIC to acquire ATC advisories and the status of airport services and facilities.
- The facilities and services necessary to safely conduct IFR operations are available and operational at the time of the particular operation. What OPSPEC lists the airports we can fly IFR to? - โ โ C-080- *Kasigluk isn't listed What three things do you need to T/O and Land under IFR? - โ โ 1. The aircraft is continuously in a position from which a descent to a ldg. on the intended rwy can be made at a normal rate of descent.
- Visibility isn't less than the prescribed vis. in the standard instrument approach.
- Visual references for the intended rwy are distinctly visible and identifiable.
5% secondary air sys; bearing seals What are the ITT probes used for and how many are there? - โ โ 8 ITT probes are used to check the temp. of your inner turbine. What is the fuel to oil heaters function in the fuel system? - โ โ - *Keeps from forming ice crystals -Maintains a fuel temp. between 21c & 32c -Min. oil temp for proper fuel heater ops- 55c at T/O pwr Describe ice protection on the prop. - โ โ -Prop is anti-ice only! Needs to be activated before going into icing conditions. The system is armed above 110 kts. -90 sec. on/off -20-24 amps -Should be turned on at 5c above frz and before vis. moisture. -Sys will not operate unless there is 40 psi oil press...this is why you can't test it on the grd. -Manual mode is spring loaded What are the minimum icing speeds? - โ โ -Flaps UP- 120 kts -10 degs- 105 kts -20 degs- 95 kts
*Except for climbing in icing conditions, maneuvering should be limited to 30 degs. of bank.
At what point during the engine start should the starter be turned off? - โ โ When the Ng has reached 52% min and stabilized Pressing the lamp test switch does what? - โ โ Illuminates all lamps and both fuel selector OFF warning horns What is meant by free turbine? - โ โ Uses fluid coupling to rotate a power turbine by What are starter limitations? - โ โ 30 sec- 60 sec 20 sec.-120 sec 30-60 20- 30-30min 20-60 min What are the following V speeds? Vx Vy Vne Vno - โ โ Vx- What is meant by a hung start in a turbine engine? - โ โ A start in which ignition occurs but the engine does not accelerate to a self- sustaining speed. What is meant by a hot start in a turbine engine? - โ โ A start in which ignition occurs but the internal temperatures go high enough that they can damage the engine. How does the Fuel Conditioning Unit operate? What are your emergency items and situations you could expect? - โ โ Normal
Next, break the "witness wire" on the emergency power lever and move it out of detent oh so slowly so you don't toast the engine. Use the emergency power lever to set torque/ITT, but realize it won't have the dampening that the regular power lever has. How many fuel nozzles and when do they operate? - โ โ There are 14 simplex nozzles, 10 primary and 4 secondary. 10 operate throughout the starting regime, 4 after 30-35% Ng. Without the 4 secondary nozzles, the engine may hang at 30-35% Ng during start. For operations from normal idle through max power, all 14 nozzles operate What is the function of the GCU (generator control unit)? - โ โ The GCU provides voltage regulation, over-voltage protection, reverse current protection, voltage regulation and automatic starter cutoff when RPM reaches above 46% Ng. Below 46%- acts as a starter Above 46%- acts as a generator (starter switch off) How does the emergency power lever operate? - โ โ In the event of a pneumatic FCU failure (a decrease of Ng to approximately 48% at sea level, with the Ng percentage increasing with altitude), the emergency power lever is used to mechanically control the fuel supply to the engine. If you accidentally move the condition lever to cutoff when on the ground, what action should you take? - โ โ Do not attempt to reintroduce fuel as this could lead to an engine overheat. You should dry motor the engine to cool it down prior to attempting a normal start.
What is the prop deice electrical draw cycle? - โ โ 20-24 amps for 90 seconds, followed by no draw for 90 seconds What is P3 air used for (other then the FCU and Compressor Bleed Air Valve)? - โ โ P3 air is used to provide suction to vacuum gauges, pressurize the deice boots, and heat the cabin in the air. Describe the different governors controlling propeller RPM. - โ โ The primary governor acts as a constant speed unit, maintaining the propeller speed selected by the pilot. The overspeed governor engages on an overspeed condition (1976 RPM or more), and dumps oil out of the prop governor. If the prop and overspeed governor fails the fuel- topping governor engages, reducing engine RPM by dumping Py air pressure from the FCU out through the primary governor. This feature also serves to limit reverse RPM since the prop is taking a much smaller bite of air in max reverse pitch than it does in normal forward pitch settings, so that in reverse RPM will exceed max RPM unless fuel control is exercised. How many igniters are in the engine and what is the NORM position for them? - โ โ Two igniters controlled by an ignition switch on the left side panel. NORM arms the igniters to turn on during the start cycle. Approximately how many gallons of Jet A in 100 pounds? - โ โ 15 gallons per 100 pounds of fuel, or 6.7 lbs./gal What does the fuel boost switch operate? - โ โ The fuel boost pump switch operates the electric auxiliary boost pump located in the reservoir
9062 Max takeoff weight 9000 Max landing weight (All aircraft) 8,550 Max takeoff for flight into known icing Fuel: Total Total Usable Per wing Total Unusable
How many gallons in the reservoir are there and for how long will it last at cruise pwr settings?
Reservoir half full for how long at full pwr-Will an annunciator illuminate?
PSI for min. fuel pressure...annunciator?
PPH approx. for normal fuel flow for eng. start?
Max imbalance? - โ โ 336 g Total fuel
168 g per wing 332 g Total usable 3.6 g Total unusable fuel both tanks on
4g Approx. fuel in reservoir 180 seconds of powered flight at cruise.
2g Approx. half reservoir; "Reservoir Fuel Low" light will illuminate; about 90 sec. of flight at full power
4.75 psi Min. fuel pressure, below this "Fuel Press Low" light will illuminate.
80-110 pph Approx. normal fuel flow for engine start
200 Max fuel imbalance weight Continued Flight in icing conditions is prohibited after encountering - โ โ โข Airspeed of 120 KIAS cannot be maintained in level flight
- Airspeed decrease of 10 KIAS that cannot be prevented by increase to max continuous power
- MEA or MOCA on current leg falls into area "C" of icing service ceiling chart contained in Section 5 of Supplement S1 of the POH
Va speeds 9062 8750 7500 6250 5000 - โ โ 9062- 143 kts 8750- 148 kts 7500- 137 kts 6250- 125 kts 5000- 112kts Best Glide speeds (with pod) 8750 7500 6250 5000 - โ โ 8750- 95 kts 7500- 87 kts 6250- 79 kts 5000- 71 kts What are the flight time limitations? Per quarter?
Within two consecutive quarters? One calendar year? - โ โ 500 per quarter 800 for every two consecutive quarters 1400 per year Rest limitations? Go past duty time by: 30 mins? 30 mins to 60 mins? 60 mins? - โ โ 11 hrs of rest required for going 30 mins over duty day 12 hrs required for going over by 30 to 60 mins 16 hrs required for 60 mins or more What is the Gurney flap and why do we have them on our C208's? - โ โ Gurney flap is a small tab projecting from the trailing edge of a wing. It improves the performance of a simple airfoil to nearly the same level as a complex high-performance design. Operates by increasing pressure on the pressure side, decreasing pressure on the suction side, and helping the boundary layer flow stay attached all the way to the trailing edge on the suction side of the airfoil. *This is what gives us the STC for taking off with 9062 lbs. Definition of Operational Control - โ โ GOM 2.1.1.
What OPSPEC requires us to do a Pre-takeoff Contamination Check? - โ โ A Name the De-Ice Cycles - โ โ -Vertical Stabilizer/Tail Horizontal Stabilizer (left & right) -Inboard wings Landing gear, cargo pod -Outboard wings Wing struts While flying to your destination the engine spools down to less than idle condition but is still running. What has probably occurred? - โ โ FCU Failure What corrective action should you take if the engine falls back to idle? - โ โ -Verify loss of power lever control and unstow EPL -Checklist The EPL is connected by direct mechanical linkage to the main fuel metering valve located in the FCU, while using the EPL, what is the min and max Ng you may use during flight? - โ โ -Min = 65% Ng -Max = 101.6% Ng While utilizing the EPL what annunciator light would you expect to see?
- โ โ Red - Emergency Power The ejector boost pump, which is driven by motive flow fuel from the FCU, normally provides fuel flow when the engine is operating. In the
event of failure of the ejector boost pump, how is fuel supplied to the engine? - โ โ Auxiliary Boost pump In order to prevent operation with one or both fuel selectors inadvertently in the OFF position, a fuel selector off warning system is installed. If you have one fuel selector off and the fuel in the tank that you are using drops to below 25 gal, what annunciator light and warning would you expect? - โ โ Left/Right Fuel Low and aural horn There are two times that you will receive a red annunciator fuel selector off warning and both horns will be activated, when are they? - โ โ -When testing the system -When attempting to start with one tank in OFF position While in cruise flight the fuel pressure low annunciator light comes on alternating with the aux. fuel pump annunciator light, what would be the checklist items if any for this situation? - โ โ -Fuel Boost ON -Monitor for fuel starvation -Land ASAP While doing a run-up you notice batt. voltage at 23.5 v. What would you see? - โ โ Voltage Low annunciator If your batt. voltage is showing 23.5 v what would be your actions? - โ โ APU Start You forget to turn off the batt. while waiting on the ground crew to show up with start cart. You recheck the voltage before starting and see
-Volt/Ammeter.......................Check volts -CB..........................................All In -GPU Switch...........................OFF -Battery...................................Min. of 20 v/ then OFF -GPU.......................................Min. 24-28 v -Battery...................................ON -Fuel Boost.............................ON (listen for pump) -Starter switch........................Start (watch for 12% Ng) -Condition..............................Low idle (fuel 80-110 pph) -Start switch...........................OFF What are the four different electrical buses? Where is DC pwr routed through? - โ โ 4 buses: -Distribution -Battery -Optional Standby Alternator -Avionics
DC pwr is routed through these four buses. ATC reports not in radar contact? - โ โ -When leaving a FAF or turning for final approach.
-Corrected time when +- 3 min. of ETA Required Position Reports - โ โ -I.D. -Position -Time -Altitude -Type of flight plan -ETA & name of next reporting pt. -Next pt. along route -Remarks (PIREPS, severe w/x) ATC reports without requests? - โ โ -When leaving any assigned alt. -When alt. change is made...i.e. VFR on Top -When unable to climb/descend @ 500 ft/min -When performing missed approach -Change in airspeed by 5% or 10 min from ETA -Time & alt. when reaching a holding fix -Loss in Nav. capability -Anything involving safety -Hazardous w/x What is the max pod floor loading limit?
