SY105

Question 1

Engine operating limits: TO/MAX

Torque, ITT, N1, Np, Oil Pressure, Oil Temperature

Answer 1

100%; 820; 104 Max; 100 Max; 90 to 120; 10 to 105

Question 2

Engine operating limits: IDLE

Torque, ITT, N1, Np, Oil Pressure, Oil Temperature

Answer 2

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)

Question 3

Engine operating limits: START

Torque, ITT, N1, Np, Oil Pressure, Oil Temperature

Answer 3

N/A, 1000 for 5 sec; N/A; N/A; 200 max; -40 min

Question 4

Engine operating limits: TRANSIENT

Torque, ITT, N1, Np, Oil Pressure, Oil Temperature

Answer 4

131 max (20 sec); 870 (20 sec); 104; 102 (20 sec); 40 to 130; 106 to 110 (10 min)

Question 5

Propeller Interface Unit receives power from

Answer 5

PMU

Question 6

What does the PIU do?

Answer 6

regulates oil pressure to pitch change mechansim

Question 7

What are the indications of a high start?

Answer 7

High/rapidly rising ITT and lower N1

Question 8

What are your primary and secondary indications of a windmilling engine?

Answer 8

Primary: N1
Secondary: Oil pressure

Question 9

When is an airstart warranted?

Answer 9

Three conditions: NO FIRE, FOD, or Frozen

Question 10

What are initial indications of engine failure?

Answer 10

Loss of power and airspeed
Rapid decay in N1, torque, and ITT
Propeller movement toward feather due to loss of oil pressure

Question 11

FEVER check for Fire in Flight

Answer 11

Fluctuating oil pressure, oil temperature, or hydraulic pressure
Excessive turbine temperature
Visual Indications (smoke or flames)
Erratic engine operation
Roughness or Vibration

Question 12

What is the minimum recommended altitude for airstart procedures?

Answer 12

2,000 ft AGL

Question 13

What are some possible causes of engine failure in-flight?

Answer 13

Fuel Starvation
Mechanical Failure
Compressor Stall

Question 14

What are some possible causes of uncommanded feather?

Answer 14

Feather dump solenoid malfunction

Loss of oil pressure to propeller pitch control mechanism

Question 15

Possible causes of high start

Answer 15

PMU failure
FMU failure
Incorrect air/fuel mixture
Low battery

Question 16

Possible indications of hung start

Answer 16

Slow rising ITT
Lower N1
Lower NP

Question 17

Possible causes of hung start

Answer 17

PMU failure 
FMU failure 
Incorrect air/fuel mixture 
Ignition system failure 
Starter failure 
Low battery

Question 18

Possible indications of no start

Answer 18

No ITT indication
Lower N1
No NP indication
No torque indication

Question 19

Possible causes of no start

Answer 19

PMU failure 
FMU failure 
Starter failure 
Ignition system failure 
Incorrect air/fuel mixture

Question 20

Initial Indications of Engine Failure

Answer 20

Loss of power and airspeed
Rapid decay of N1, torque, and ITT
MASTER WARN lights and tone
Propeller moves toward feather

Question 21

Accompanying Indications of Engine Failure

Answer 21

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

Question 22

Possible Causes of Engine Failure

Answer 22

Fuel Starvation
Mechanical Failure
Compressor Stall

Question 23

Possible Indications of PMU failure

Answer 23

Power step change
PMU FAIL and PMU STATUS annunciators
MASTER WARN light
Aural tone

Question 24

Possible Causes of PMU failure

Answer 24

System failure System malfunction

Question 25

Possible Indications of Uncommanded Power Changes/Loss of Power

Answer 25

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

Question 26

Possible Causes of Uncommanded Power Changes/Loss of Power

Answer 26

Engine rollback due to PMU scheduling Oil/engine/fuel system contamination

Question 27

Possible Indications of Uncommanded Feather

Answer 27

``` Rapid loss of power High torque Lower NP Possible PMU FAIL/PMU STATUS annunciators Engine vibration Engine noise ```

Question 28

Possible Causes of Uncommded Feather

Answer 28

Feather dump solenoid malfunction | Loss of oil pressure to propeller pitch control mechanism

Question 29

Possible Indications of Prop Sleeve Touchdown

Answer 29

``` NP fluctuations Increasing torque Decreasing thrust Engine vibrations Possible CHIP detector warning light ```

Question 30

Possible Causes of Prop Sleeve Touchdown

Answer 30

Loss of oil pressure to propeller pitch control mechanism from momentary contact between oil transfer sleeve and propeller shaft

Question 31

Possible Indications of Engine Fire in Flight

Answer 31

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 ```

Question 32

Possible Causes of Engine Fire in Flight

Answer 32

Fuel or oil leaks | Fire getting outside the engine