SYS105 - Propulsion Review Flashcards
What are the three types of abnormal starts?
- Hot 2. Hung 3. No Start
What are the possible indications for a Hot Start?
High/Rapidly rising ITT Lower N1 Lower Np
What are the possible causes for a Hot Start?
PMU Fail FMU Fail Incorrect air/fuel mixture Low Battery
Around what % N1 would you expect to see Hot Start indications?
37% N1
What are the possible indications for a Hung Start?
Slow Rising ITT Lower N1 Lower Np
Why would a low battery possibly cause a Hot Start?
The battery doesn’t provide enough energy to the starter to provide enough cool airflow to the engine, causing a hot start.
Around what % N1 would you expect to see Hung Start indications?
27% N1
What are the possible causes for a Hung Start?
PMU Fail FMU Fail Incorrect air/fuel mixture Low Battery Starter Failure Ignition Systems Failure
What are the indications for a No Start?
No ITT indication Lower N1 No Np No Torque
What are the possible causes for a No Start?
PMU Fail FMU Fail Incorrect Air/Fuel Mixture Starter Failure Ignition System Failure
What is the first thing you should check if you suspect an engine failure?
N1
What are the possible indications of an engine failure in flight?
Loss of power and airspeed Rapid decay of N1, torque, and ITT MASTER WARN lights and tone Prop moves toward feather Lower than normal oil pressure Loss of engine noise
What annunciators might accompany an engine failure?
GEN FUEL PX OIL PX OBOGS FAIL PMU FAIL CKPT ALT
What are the possible causes for an engine failure?
Fuel starvation Mechanical Failure Compressor Stall
What are the possible indications of a PMU failure?
Power step change PMU FAIL and PMU Status annunciators MASTER WARN light and tone
What are the possible causes of a PMU Failure?
System Malfunction System Failure
What are the possible indications for an Uncommanded Power Change/Loss of Power?
Reduction in power/thrust Lower than expected fuel flow Uncommanded decrease in N1 High RITT on AEDD
If you have an Uncommanded Power Change/Loss of Power with oil/fuel/engine system contaminiation, what would you expect to see in addition to the normal indications?
Power Surges Uncontrollable high power
What are the possible causes of Uncommanded Power Change/Loss of Power?
Engine rollback due to PMU Oil/engine/fuel system contamination
What are the possible indications of an Uncommanded Prop Feather?
Rapid loss of power High Torque Lower Np Engine Vibration Engine Noise
What annunciators might appear if you have an uncommanded prop feather?
PMU FAIL and PMU STATUS
What are the possible causes of an uncommanded prop feather?
Feather dump solenoid malfunction Loss of oil pressure to prop pitch control mechanism
What are the possible indications of a prop sleeve touchdown?
Torque and NP fluctuations Decreasing thrust Engine vibrations Possible CHIP warning
What are the possible causes of a prop sleeve touchdown?
Loss of oil pressure to prop pitch control mechanism from momentary contact between oil transfer sleeve and prop shaft
What is the boldface procedure that applies to a Prop Sleeve Touchdown?
Uncommanded Power Change/Loss of Power/Prop Feather Bold Face
What is the FEVER check?
Fluctuating oil px, temp, hydraulic px Excessive ITT Visual Indications (smoke/flames) Erratic Engine Operations Roughness or Vibrations
What are the possible indicators of an Engine Fire in Flight
FIRE annunciator MASTER WARN light and tone
How many indications from the FEVER check must be confirmed before you confirm a fire in flight?
Only 1
What are the possible causes for an engine fire in flight
Fuel or oil leaks Fire getting outside the engine
