NGX to NG

Question 1

What does the condition lever do?

Answer 1

It sets some systems of the aircraft to different phases of flight:
1. Flight idle
2. Ground idle
3. Cut-off feather

Question 2

What are the engine limitations of the NG during T/O?

Answer 2

Torque = 44.34
ITT = 850

5 min max!
Remebre, there is no T/O or MCP indications on the instruments, so you will need to monitor the engine parameters constantly!

Question 3

What are the engine limitations of the NG during climb?

Answer 3

Torque = 44.34
ITT = 820 (recommended 780)

Question 4

What are the engine limitations of the NG during cruise?

Answer 4

Torque = 36.95
ITT = according to torque table

Question 5

What are the engine limitations of the NG during start?

Answer 5

20 sec: ITT above 870°C
5 sec: ITT above 1000°C

Question 6

What’s MMO for the NG?

Answer 6

0.48 M

Question 7

When will MMO become limiting in the NG?

Answer 7

When at or above FL150.

Question 8

What’s the max allowed prop RPM?

Answer 8

Normal OPX = 1700 RPM
Transient (20 sec) = 1870 RPM
Reverse = 1650 RPM

Question 9

Why should the RPM not fall below 950 when on the ground?

Answer 9

Because this will cause vibrations that might damage the airframe.

Question 10

What’s the normal startup procedure for the NG?

Answer 10

1. Starter button –> PRESS
2. Ng > 13%
3. Condition lever –> GROUND IDLE
4. Fuel pumps –> VERIFY GREEN

Question 11

What’s a warm start and what is the procedure?

Answer 11

A warm start is when the ITT is higher than 150°C.
Wait until ITT < 150°C before attempting to start the engine.

Question 12

What’s a cold start and what is the procedure?

Answer 12

A warm start is when the OIL temperature is below 5°C.
When Ng reaches 13%, select FLIGHT IDLE on the condition lever until Ng reaches 50%, then set the CL to GROUND IDLE.

Question 13

Why must we test the fuel pumps before the engine start?

Answer 13

Because on the NG, the green PUMP indication, only indicates the relay switch position but it DOES NOT mean that the pumps are effectively working.
So before engine start, we have to set the pumps to ON and verify that we can hear the pumps activating.
This will confirm that they are effectively running.

Question 14

How do you know that the fuel filter is clogged and that the bypass is in use?

Answer 14

1. A red indicator button will have popped up on the bypass.
2. The fuel filter drain should show traces of contamination.

Question 15

What is the FCU?

Answer 15

The Fuel Control Unit.
It is a complec system of pistons and valves that modulates the amount of fuel sent to the engine based on the position of the CPL and on P3 (the pressure between the centrifugal compressor and the combustion chamber), to protect against engine surge in case of low pressure.

Question 16

How does the torque limiter work?

Answer 16

It monitors oil pressure to keep the torque below 44.3 PSI.
It achieves this by opening a valve that will reduce Py which in turn will simulate a drop in P3 and trick the FCU into reducing the fuel flow which will result in a reduction of the torque.

Question 17

When should you use Prist?

Answer 17

When OAT < 0°C

Question 18

What’s the required Prist concentration?

Answer 18

Between 0.06% and 0.15%
A good middle ground is to aim for 0.1% which corresponds to 1L of Prist per 1000L of fuel or 500mL per 500L.

Question 19

What’s the max reverse blade angle?

Answer 19

-17.5°

Question 20

Which systems are connected to the condition lever?

Answer 20

1. The boost pumps
2. The prop feather
3. The pressurization system (in case of a WoW failure)

Question 21

When should the CL be set to FLIGHT IDLE in normal operations?

Answer 21

From line up to landing.

Question 22

Which systems will become unavailable when using the MOR?

Answer 22

1. Ng governor
2. Torque limiter
3. Nf governor

Question 23

What shoul you pay particularly attention to while operating the MOR?

Answer 23

1. PCL must be in idle position
2. MOR must be moved slowly so as to avoid ITT exceedance

Question 24

When should you use the MOR?

Answer 24

1. In case of PARTIAL PWR loss
2. Ng > 50%
3. Fuel flow > 90 lbs / hour

Question 25

What is the minimum Ng value that you should maintain while operating the MOR in cruise?

Answer 25

65%

Question 26

What is the minimum Ng value that you should maintain while operating the MOR from top of descent to touchdown?

Answer 26

75%

Question 27

Can you taxi using the MOR?

Answer 27

No!

Question 28

By which factor shall the LDG distance be multiplied when using the MOR?

Answer 28

LDR x 2

Question 29

What are some of the main systems that are NOT present on the NG?

Answer 29

1. Datalink / CPDLC
2. Bank tactile feedback
3. PLS
4. A/T
5. TCAS II
6. Fuel temperature probe
7. Automatic YD cancellation

Question 30

How long can the PCL be maintained in the same position while in the beta range?

Answer 30

There is no limitation on the NG