Engine

Question 1

What is the FADEC?

Answer 1

Full Authority Digital Engine Control. Basically a computer for the engine that automatically manages the thrust mode.

Question 2

What is ATTCS?

Answer 2

Automatic Takeoff Thrust Control System. It is a FADEC feature that will automatically increase thrust during a takeoff or go-around when thrust levers are in TOGA and:

• An engine failure is detected, or
• N1 difference between engines of 15% or more, or
• Windshear is detected

Question 3

What is N1?

Answer 3

N1 is the speed of the shaft with the fan, low pressure compressors, and low pressure turbines. Since the engines are high bypass, most of the air that enters the engine is accelerated by the fan then flows out of the engine, bypassing the core.

Question 4

What is used primarily to set thrust?

Answer 4

N1

Question 5

What does the cyan chevrons and green lines indicate?

Answer 5

The target N1 at TOGA thrust. The green lines show the target N1 at MAX thrust.

Question 6

When is MAX thrust used?

Answer 6

Stall recoveries, windshear escape, or as needed for single engine operations.

Question 7

What is the ITT?

Answer 7

Interstage Turbine Temperature. It just measures engine temperature and is shown by a red tick mark for the max.

Question 8

What is the max ITT for engine start?

Answer 8

815 C which is the red line.

Question 9

What is N2?

Answer 9

The speed of the shaft linking the high pressure compressors and turbines of the engine (the core of the engine)

Question 10

Are N1 and N2 connected?

Answer 10

The N1 and N2 shafts rotate independently and are not mechanically connected.

Question 11

How is fuel flow shown?

Answer 11

Pounds per Hour (PPH)

Question 12

How do you know when oil pressure is good or not?

Answer 12

Green indicates normal, amber in caution range, and red if a limit has been exceeded.

Question 13

When should oil pressure rise on an engine start?

Answer 13

It must rise greater than 0 within 10 seconds, if not abort.

Question 14

How much engine bleed pressure do you need for a crossbleed start?

Answer 14

40-45 PSI.

Question 15

While on the ground, thrust should be limited to what as much as possible?

Answer 15

40% N1 or below.

Question 16

Who checks engine oil level and when should maintenance be called?

Answer 16

The captain. Maintenance should be called if showing in the amber.

Question 17

What are the start attempt limitations on the ground.

Answer 17

1 & 2: 90 seconds ON, 10 seconds OFF
3-5: 90 seconds ON, 5 minutes OFF

Question 18

When is fuel introduced to the engine during an engine start?

Answer 18

At 20% N2 as long as the ITT is less than 120C.

Question 19

When should an engine start be aborted?

Answer 19

1. No positive oil pressure indication within 10 seconds after N2 rotation.
2. Positive increase in N1 is not indicated before starter cutout (50% N2). Usually occurs because of tailwind. Position aircraft different.
3. No ITT indication within 30 seconds after fuel flow (No light-off).
4. ITT exceeds start limit (815C) (Hot Start)
5. Oil pressure stabilizes below normal limits.
6. N1 and/or N2 failing to accelerate to stable idle speed (Hung Start).
7. Intermittent electrical, pneumatic or starter malfunction before starter disengagement.