SY105 Flashcards
Engine operating limits: TO/MAX
Torque, ITT, N1, Np, Oil Pressure, Oil Temperature
100%; 820; 104 Max; 100 Max; 90 to 120; 10 to 105
Engine operating limits: IDLE
Torque, ITT, N1, Np, Oil Pressure, Oil Temperature
3-8%; 750; 60 to 61 (ground), 67 min (flight); 46 to 50 (ground); 90 min; -40 to 105 (ground), 10 to 105 (flight), 106 to 110 (up to 10 minutes)
Engine operating limits: START
Torque, ITT, N1, Np, Oil Pressure, Oil Temperature
N/A, 1000 for 5 sec; N/A; N/A; 200 max; -40 min
Engine operating limits: TRANSIENT
Torque, ITT, N1, Np, Oil Pressure, Oil Temperature
131 max (20 sec); 870 (20 sec); 104; 102 (20 sec); 40 to 130; 106 to 110 (10 min)
Propeller Interface Unit receives power from
PMU
What does the PIU do?
regulates oil pressure to pitch change mechansim
What are the indications of a high start?
High/rapidly rising ITT and lower N1
What are your primary and secondary indications of a windmilling engine?
Primary: N1
Secondary: Oil pressure
When is an airstart warranted?
Three conditions: NO FIRE, FOD, or Frozen
What are initial indications of engine failure?
Loss of power and airspeed
Rapid decay in N1, torque, and ITT
Propeller movement toward feather due to loss of oil pressure
FEVER check for Fire in Flight
Fluctuating oil pressure, oil temperature, or hydraulic pressure Excessive turbine temperature Visual Indications (smoke or flames) Erratic engine operation Roughness or Vibration
What is the minimum recommended altitude for airstart procedures?
2,000 ft AGL
What are some possible causes of engine failure in-flight?
Fuel Starvation
Mechanical Failure
Compressor Stall
What are some possible causes of uncommanded feather?
Feather dump solenoid malfunction
Loss of oil pressure to propeller pitch control mechanism
Possible causes of high start
PMU failure
FMU failure
Incorrect air/fuel mixture
Low battery
Possible indications of hung start
Slow rising ITT
Lower N1
Lower NP
Possible causes of hung start
PMU failure FMU failure Incorrect air/fuel mixture Ignition system failure Starter failure Low battery
Possible indications of no start
No ITT indication
Lower N1
No NP indication
No torque indication
Possible causes of no start
PMU failure FMU failure Starter failure Ignition system failure Incorrect air/fuel mixture
Initial Indications of Engine Failure
Loss of power and airspeed
Rapid decay of N1, torque, and ITT
MASTER WARN lights and tone
Propeller moves toward feather
Accompanying Indications of Engine Failure
Rapidly decreasing ITT, NP
Lower-than-normal oil pressure
Engine noise
GEN, FUEL PX, OIL PX, OBOGS FAIL annunciators
Possibly PMU FAIL and CKPT ALT annunciators
Possible Causes of Engine Failure
Fuel Starvation
Mechanical Failure
Compressor Stall
Possible Indications of PMU failure
Power step change
PMU FAIL and PMU STATUS annunciators
MASTER WARN light
Aural tone
Possible Causes of PMU failure
System failure System malfunction
Possible Indications of Uncommanded Power Changes/Loss of Power
Reduction in power/thrust
Lower than expected fuel flow
Uncommanded decrease in N1
High raw ITT (RITT) on AEDD
With oil/engine/fuel system contamination, additionally: Power surges
Uncontrollable high power
Possible Causes of Uncommanded Power Changes/Loss of Power
Engine rollback due to PMU scheduling Oil/engine/fuel system contamination
Possible Indications of Uncommanded Feather
Rapid loss of power High torque Lower NP Possible PMU FAIL/PMU STATUS annunciators Engine vibration Engine noise
Possible Causes of Uncommded Feather
Feather dump solenoid malfunction
Loss of oil pressure to propeller pitch control mechanism
Possible Indications of Prop Sleeve Touchdown
NP fluctuations Increasing torque Decreasing thrust Engine vibrations Possible CHIP detector warning light
Possible Causes of Prop Sleeve Touchdown
Loss of oil pressure to propeller pitch control mechanism from momentary contact between oil transfer sleeve and propeller shaft
Possible Indications of Engine Fire in Flight
FIRE annunciator
MASTER WARN light
Aural tone
Fluctuating oil pressure, oil temperature, or hydraulic pressure Excessive turbine temperature Visual indications (smoke or flames) Erratic engine operation Roughness or vibration
Possible Causes of Engine Fire in Flight
Fuel or oil leaks
Fire getting outside the engine
