Chapter 4 - Engine Fuel and Control

Question 1

What is the arrius 2k2 engine equipped with?

Answer 1

A single channel digital engine control system with manual and mechanical backup

Question 2

What do the cockpit engine controls do?

Answer 2

Allow the pilot to establish engine operation mode and to override (if necessary) the auto engine control system

Question 3

What are the ECL?

Answer 3

They are the engine control levers installed on the overhead control panel, and can be controlled manually or through the trim switches on the collective lever

Question 4

How is the engine controlled in AUTO mode with ECL in flight do?

Answer 4

The engine is started by the engine mode switch and controlled by the EECU

Question 5

How is the engine controlled in MANUAL mode?

Answer 5

The engine is started with the starter pushbutton on the ECL and fuel metering is controlled by the lever position

Question 6

What are the ECLs connected to by flexible cables?

Answer 6

HMU

Question 7

What happens when the ECL is in the off position?

Answer 7

The engine fuel flow is stopped even when the ENG GOV switch is in auto or manual

Question 8

How does the trim switches move the ECL?

Answer 8

Through an electrical actuator

Question 9

What force load can break the link to the electrical actuator on the ECL?

Answer 9

Force of 4.5kg

Question 10

What can the start button on the ECL also do?

Answer 10

Used to carry out a dry crank for engine cleaning

Put out an internal fire

Question 11

What 3 controls/indications are on the ‘Engine control panel’?

Answer 11

Engine mode switches
OEI training switch
Two red engine fire lights

Question 12

What do the 3 modes on the ECP do?

Answer 12

OFF - EECU commands fuel shutoff and engine shutdown
IDLE - EECU controls starting, engine acceleration up to IDLE speed of 70%NF
FLIGHT - EECU controls starting, acceleration, maintains NF speed at 100 or 102%

Question 13

What does the OEI TRAINING switch do?

Answer 13

The selected engine will handle the loads to maintain the rotor speed, while the other engine reduces to 90%NF. The relevant indications would appear as though OEI

Question 14

When will the OEI TRAINING switch abort (7)?

Answer 14

Critical failure or flame-out of either engine
Failure of interface with either EECU
Reversion to manual mode
Loss of ARINC crosstalk between EECU
NR dropped below 87%
Limit override selected
EECU critical failure

Question 15

What do the collective potentiometer (LVDT) do?

Answer 15

Provide a signal to both EECUs proportional to the torque tube angular position.
The signal is the prevent rotor RPM drop due to a sudden movement of collective pitch by changing the fuel flow to the engines

Question 16

What does the Engine limit override button do?

Answer 16

It allows the pilot to exceed the 2.5min OEI rating on both engines, going to the ultimate limits that the engine and helicopter can safely support

These limits can be reset upon a second push on the button

Question 17

What message appears on the MFD once engine limit override button is pressed?

Answer 17

‘LIM OVRD ON’ advisory message

Question 18

What is the purpose and the 3 positions of the NR switch?

Answer 18

To control rotor RPM
Lo: manual selection of 100%NR (LG up).
Hi: manual selection of 102%NR (LG down).
Auto: Auto selection of 102%NR during takeoff and landing according to position of the landing gear.