Cessna 208 Study Guide Checkride.

While flying to your destination the engine spools down to less than idle condition but is still running. What has probably occurred? FCU Failure What corrective action should you take if the engine falls back to idle? -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? -Min = 65% Ng -Max = 101.6% Ng While utilizing the EPL what annunciator light would you expect to see? 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? 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? 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? -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? -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? Voltage Low annunciator If your batt. voltage is showing 23.5 v what would be your actions? 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 that it is now 19.5 v. What should you do? Get maintenance to change the battery. While initiating the prop overspeed governor test the prop stabilizes at 1810 rpm. Would you be willing to take off with this indication? Why or why not? Yes. Limits are 1750 -+60...you are within limits. While you are standing around waiting to depart, you decide to check the prop de-ice system for proper operation. What actions could you take to activate the prop. de-ice system while on the ground and the engine not running? The sys is protected by an oil operated pressure switch and it can't be turned on without the engine running. What is the maximum fuel difference allowable? 200 lbs. You are flying a C 208B w/KFC 150 autopilot and you lose vacuum pressure. What flight instruments would be affected? Attitude Indicator- Pilots side Directional Gyro- Co-pilots side While using the stand-by flap sys, what limitation is associated with the use of the auto-pilot? Autopilot must be OFF The Generator Control Unit (GCU) provides for automatic starter cutoff when the engine reaches what % of Ng? 46% Ng At what point does the Starter-Generator act as a generator? At 46% Ng and starter turns off At what point during the engine start should the starter be turned off? When the Ng has reached 52% min and stabilized Pressing the lamp test switch does what? Illuminates all lamps and both fuel selector OFF warning horns What is meant by free turbine? Uses fluid coupling to rotate a power turbine by What are starter limitations? 30 sec- 60 sec 20 sec.-120 sec 30-30min 20-60 min What are the following V speeds? Vx Vy Vne Vno Vx- What is meant by a hung start in a turbine engine? 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? 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? Normal FCU operation on a Caravan is through the power lever setting the N1 governor, which in turn regulates the fuel metering valve via a pneumatic bellows-based rate and fuel flow scheduling system to set the desired gas generator speed (and consequently, power output). It does this by using P3 bleed air to modulate the flow of fuel to the engine...i.e. if you slam the power lever forward from a low Ng setting, the fuel flow will gradually increase as P3 pressure increases. A leak in the P3 system would render the regular power lever inoperative A separate emergency power lever (used only when the normal power lever isn't working because of an internal fuel control failure) directly, mechanically positions the FCU fuel metering valve, with no overspeed or acceleration-deceleration rate protection. If the engine were to spool down to idle, your memory items are FBI- Fuel Selectors- ON Fuel Boost- ON Ignition-ON ...then start diagnosing. If it was an engine flame-out, FBI probably cured it. If the engine is running but with low Ng, move the power lever and see if Ng changes. If Ng is low but doesn't change, you've confirmed a P3 failure and the power lever is useless and you stow it. 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.