Engines

Question 1

What engine do we have

Answer 1

GE CF34-8E5, High Bypass, Dual rotor turbofan, FADEC rated @ 13,000lbs of thrust

Question 2

How does the FADEC operate?

Answer 2

Changs thrust modes to extend engine life

Automatically switches from the 10th stage bleed to the 6th stage bleed during times of high thrust demand

demand T/O Climb/Cruise = 6th Stage Bleed (LP)

Pulls less energy than from the 10th stage with just enough pressure to run PACKS

Descent/Approach = 10th stage Bleed (HP)

Pulls lots of energy. Must provide enough pressure to run anti-ice at near idle settings so aircraft can stay ice free during the descent

Question 3

What do the Cyan and Green N1 chevrons mean?

Answer 3

Cyan = target N1

Green = MAX Thrust

Question 4

What is ATTCS?

Answer 4

Automatic Takeoff Thrust Control System.

Question 5

When will the Automatic Takeoff Thrust Control System (ATTCS) change?

Answer 5

White is means ATTCS is armed Green is engaged and will engage when thrust levers reach TO/GA position

Question 6

Thrust Rating Modes CLB 1 and 2

Answer 6

Landing gear retracted
Airplane is above 400 AGL
Any change in vertical mode

Question 7

Thrust Rating Mode CRZ

Answer 7

Airplane is level at the preselected altitude for 90 second and airspeed within 5 knots from preselected airspeed

Question 8

Thrust Rating Modes CON?

Answer 8

Automatically if engine fails at or above 3000 AGL

Manually selected in the MCDU TRS menu

Question 9

Thrust rating mode GA

Answer 9

GA appears when: Flaps are >0 and Gear Down OR
From CRZ, CON, CLB if TOGA is pressed

Question 10

Can you change the thrust mode manually?

Answer 10

Yes through the MCDU in the TRS menu

Question 11

Name a few Thrust Modes the airplane has.

Answer 11

TO1/2/3 - T/O thrust calculated
from the MCDU

TO RSV - Whenever ATTCS is active and TLA at TO/GA the

GA - Landing gear down, flaps down or in a different mode and

TO/GA is pressed

GA-RSV - highest rated engine thrust for extreme situations

CON - highest thrust engines can be continuously run in EMER situations

CLB - Maximum climb rating

CRZ - Maximum N1 for Cruise

Idle - Flight, Approach, Final, Ground

Question 12

When will ATTCS provide reserve thrust automatically?

Answer 12

Commands reserve whenever engaged, thrust levers set to TO/GA, AND:

Difference between both engine N1 valve is greater than 15%

One engine failure during takeoff

One engine failure during go around

Windshear warning

RSV can be manually activated if Thrust set to MAX

Question 13

What is the difference between MAX and TOGA? TO-x RSV vs GA RSV?

Answer 13

TOGA - Will give you the thrust used for a normal takeoff from the T/O data in MCDU

MAX - Will give you TO-x RSV thrust or GA RSV depending if taking off or going around. Extra boost of thrust.

Question 13

What is the difference between MAX and TOGA? TO-x RSV vs GA RSV?

Answer 13

TOGA - Will give you the thrust used for a normal takeoff from the T/O data in MCDU

MAX - Will give you TO-x RSV thrust or GA RSV depending if taking off or going around. Extra boost of thrust.

Question 14

When is engine vibration more likely?

Answer 14

In moderate to severe ice conditions and caused by asymmetric ice shedding

Question 15

What do the Start/Stop selectors do?

Answer 15

STOP: Commands FADEC to shutdown engine if thrust levers in Idle

RUN: Normal position for engine operation

START: Initiates start procedure and automatically introduces fuel at 20% as long as the ITT is <120 degrees

Question 16

What do the Ignition knobs do? Do we have automatic relight with the igniters?

Answer 16

OFF: Deactivates ignition and inhibits fuel flow. FADEC ignores OFF in flight

AUTO: FADEC turns ignition on when N2 is 7% and can auto relight engines

OVRD: Enables FADEC to continuously activate both igniters