Engines

Question 1

How many Igniters per Engine?

Answer 1

Two per engine

Question 2

How many igniters activate for engine start?

Answer 2

• Ground = 1 igniter (AUTO)

- Flight = 2 igniters (AUTO)

Question 3

What happens when the ignition switch is selected to OVRD?

Answer 3

• Activates both igniters on the ground or in flight.

Question 4

Can the igniters be turned off during flight?

Answer 4

• The switch may be moved to the OFF position but the FADEC disregards
  the command.
• The OFF position is used for dry motoring on the ground only.

Question 5

What controls the engine?

Answer 5

• A two-channel FADEC
• One channel is active and the other channel remains in standby as a
  backup

Question 6

Do the FADEC(s) alternate automatically during engine start?

Answer 6

• YES (unless a fault is noted)

Question 7

What does the Cyan line on the N1 gauge represent during approach?

Answer 7

• The minimum N1 for Bleed requirements in Icing Conditions.

Question 8

When does the Cyan line appear?

Answer 8

• Displayed only in icing conditions during final approach (below RA 1200’)
  with landing gear down or flaps extended

Question 9

The Engine may be started via what means?

Answer 9

• APU
• Ground Source (Huffer cart or Air Bottle)
• Opposite Engine X-Bleed start
• Windmill start

Question 10

Does the FADEC provide engine start protection?

Answer 10

• Yes, but only on the ground during a hot start, hung start or no light-off.

Question 11

During an Engine Start, the FADEC will prevent Fuel Flow introduction with an
ITT greater than?

Answer 11

• 120°C

Question 12

Describe a normal Engine Start sequence (on the ground)?

Answer 12

• Start switch momentarily to START (At least 2 sec)
• 7% N2 = Ignition
• 20% N2 = Fuel flow
• 5 sec after Fuel Flow = Light-off (IGN ON)
• 50% N2 = Ignition off/Starter Cutout

Question 13

What does the WML indication mean on the EICAS?

Answer 13

• Wind-milling engine &
• The FADEC has detected a flame-out and is attempting an auto re-light, or
• An assisted start has been commanded.

Question 14

Does Fadec provides underspeed and overspeed protection?

Answer 14

Yes

Question 15

What happens after 3 overspeed detection events?

Answer 15

• FADEC will not re-light the engine

- (3 events within 30 seconds to trigger it)

Question 16

What heats the fuel and cools the engine oil?

Answer 16

• Fuel/Oil Heat Exchanger (i.e. Fuel Cooled Oil Cooler)

Question 17

What does ATTCS stand for?

Answer 17

• Automatic Take-off Thrust Control System

Question 18

What controls ATTCS?

Answer 18

• FADEC controlled
• Provides max thrust reserve (RSV) according to current rate previously
  selected via the MCDU

Question 19

What will trigger an ATTCS event?

Answer 19

• N1 difference >15% between engines (or)
• Engine failure during TOGA (or)
• Windshear detected

Question 20

What happens if a Thrust Reverser inadvertently deploys in flight?

Answer 20

FADEC limits respective engine thrust to IDLE

Question 21

What is FLEX?

Answer 21

• Reduced takeoff thrust based on assumed temperature
• (telling the FADEC that it is warmer than it actually is so it will reduce the
  thrust)

Question 22

Flex Thrust is limited to no more than ___ percent of normal TO-1 or TO-2
Thrust?

Answer 22

25%