Powerplant

Question 1

What does the ECU provide?

Answer 1

1. Ground idle fuel scheduling
2. Prop underspeed governing - 785 rpm
3. Prop governing in reverse - 1140 rpm
4. Quiet taxi mode
5. Fuel scheduling in forward power range
6. Power uptrim
7. Bleed valve operation

Question 2

What is the indication of an ECU failure?

Answer 2

Caution light “#_ENGINE MANUAL”, change in power output by engine

Question 3

What controls fuel scheduling?

Answer 3

ECU

Question 4

What are the MTOP limits?

Answer 4

Torque:  111%
ITT:  800
Max Nl:  104%
Max Nh:  102.7%
Max Np:  1212 rpm
Oil Press:  55-65 PSI
Oil Temp:  45-115 C

Question 5

What is the purpose of the engine intake bypass doors?

Answer 5

Prevent solids and precipitation from entering the engine

Question 6

What are the start malfunctions and action to be taken?

Answer 6

Hot Start: CL Fuel Off, Ignition Off, Motor engine 15 seconds
Hung Start: CL Fuel Off, Ignition Off, Motor engine 15 seconds
Failure to light: CL Fuel Off, Ignition Off, Motor engine 15 seconds
No Starter Cut-out: Starter Off, DC Ext Power Off
Low or No Oil Pressure: CL Fuel Off, Starter Off

Question 7

When does the starter change to a generator during start?

Answer 7

63 +/- 2% Nh

Question 8

What are the starter limits?

Answer 8

1 on 2 off, 1 on 2 off, 1 on 30 mins off

Question 9

What is the maximum ITT for start?

Answer 9

950 degrees C

Question 10

What is the normal max ITT?

Answer 10

800 degrees C

Question 11

When does the ENG OIL PRESS warning light illuminate?

Answer 11

42 +/- 2 degrees C

Question 12

What is the minimum in flight Nh?

Answer 12

66%

Question 13

What services are operated on the accessory gear box?

Answer 13

DC Starter/Generator, engine oil pressure, scavenge pumps, engine high pressure fuel pump

Question 14

What are the indications of UPTRIM?

Answer 14

Power Uptrim light illuminates, power increase in the engine

Question 15

What will happen if the ECU fails?

Answer 15

Caution light illuminates (#_MANUAL ENGINE), affected engine will increase power output

Question 16

What is the maximum in flight prop RPM setting?

Answer 16

1212 RPM

Question 17

What prop RPM does the ECU provide underspeed governing to (ground governing)?

Answer 17

785 RPM

Question 18

What is the propeller restricted range?

Answer 18

500-780 RPM

Question 19

What is the auto-feather delay?

Answer 19

3 seconds

Question 20

When will the auto-feather ARM?

Answer 20

Push the AUTOFEATHER Switchlight, Power Levers advanced so both engine torques exceed 38% and both Power Levers are advanced to meet PLA and OAT requirements

Question 21

When will the auto-feather activate?

Answer 21

Activates when the torque on one engine is less than 28% while the torque on the other engine is more than 38% and both PL are advanced to meet the PLA and OAT requirements

Question 22

What propeller over speed protection is there?

Answer 22

Hydraulic (1250) and pneumatic (1308)

Question 23

How do you manually feather the propeller?

Answer 23

Move CL to the START/FEATHER position, alternate feather switch activated

Question 24

What RPM difference will the syncrophase sync the propellers?

Answer 24

20 RPM

Question 25

What RPM will the over-speed governor hold the RPM at?

Answer 25

1250 RPM (Hydraulic)

Question 26

When does the ECU over-speed protection occur?

Answer 26

1308 RPM (Pneumatic)

Question 27

When do the propeller ground range advisory lights illuminate?

Answer 27

Props in ground BETA range (blade angle decreasing through 16.5 degrees)

Question 28

What services are operated from the prop reduction gear box?

Answer 28

1. Main hydraulic pump
2. Propeller Control Unit
3. PCU pump
4. Propeller Over-speed Governor
5. 115 VAC Generator

Question 29

Where does the PCU get it’s oil from?

Answer 29

Engine oil system in the Reduction Gear Box

Question 30

What happens if the prop loses oil?

Answer 30

Prop tries to go to flat pitch, pitch lock engages