70 Engines

Question 1

Oil quantity required?
CEO and NEO

Answer 1

9.5 qt + 0.5 qt/h
10.6qt + 0.45qt/h

Question 2

N1 and N2 vibration advisory limits?

Answer 2

> 6 units N1
4.3 units N2

Question 3

Maximum time on TOGA for one engine?

Answer 3

10 minutes (also dictates maximum single engine acceleration altitude)

Question 4

Max time on TOGA two engines?

Answer 4

5 minutes

Question 5

Minimum oil temperature for start?

Answer 5

-40degC (same for NEO)

Question 6

Minimum oil temperature for take off?

Answer 6

-10degC (or 19degC for NEO)

Question 7

If CLOG appears on the ENGINE SD page next to the F. USED indication, why and where is the clog?

Answer 7

There is excessive pressure across the fuel filter

Question 8

If CLOG appears on the ENGINE SD page next to the oil PSI indication, why and where is the clog?

Answer 8

There is excessive pressure across the main oil scavenge filter

Question 9

Does the NEO have any differences in engine anti ice?

Answer 9

Yes

ENGINE SD page shows CORE and BOOST functions.

Where CORE indicates Variable Bypass Valves (VBVs) are used to provide hot air to engine core to prevent ice crystals

And BOOST uses bleed air from 7th stage of HP compressor to improve start performances and provide hot air to the booster

Question 10

In what way is the A321 Neo fuel system different?

Answer 10

It doesn’t have centre tank pumps. Just a transfer valve.

When the transfer valve is open, fuel from the wing tank pumps flows through the jet pump and creates a suction in it.
The suction moves the fuel from the centre tank to the related wing tank.

The transfer valves are automatic and open if the wing tank is not full and stop 5 min after centre tank low level reached.

Question 11

What does the accessory gearbox in the engine drive?
(6)

Answer 11

Operates:
Oil pump
Fuel pump
Hydraulic engine pumps (green and yellow)
Engine generators
The fadec alternator
Pneumatic starter

Question 12

What does FADEC stand for?

How many channels ?

Answer 12

Full Authority Digital Engine Control

2 channels

Question 13

What does FADEC do?

(7)

Answer 13

Performs complete engine management.

Controls:
Fuel flow
Protection against limits
Power management (ATHR demand)
Automatic engine start
Thrust reverser control
Fuel recirculation
Transmission of engine parameters to the flight deck screens.

Question 14

What is approach idle?
What config do we get it in?

Answer 14

Config 3 or full
A slightly higher idle that allows the engine to accelerate rapidly from idle to go-around thrust.

Question 15

Explain the start sequence on the CEO?

Answer 15

Master switch on
N2 increases
At 16% N2 we get ignition (A or B)
At 22% Fuel flow increases
15 seconds later EGT and N1 should increase
At 50% N2 start valve closes, Igniter off.

Question 16

How does an engine operate?

Answer 16

Air is compressed, them heated by burning fuel. After which it passes through the turbines which drive the compressors and the fan producing thrust.
High bypass rationengine, 80% of air goes through the fan/bypass.

Question 17

Which part of the engine do we get our N1 and N2 figures from?

Answer 17

N1 - The fan
N2 - HP compressor