Engine

Question 1

How much thrust do the engines produce?

Answer 1

(ISA) 13,000 lbs. 14,200 lbs when ATTCS active.

Question 2

How many igniters per engine?

Answer 2

Two per engine.

Question 3

How many igniters activate for engine start?

Answer 3

Ground - 1 igniter. Flight- 2 igniters.

Question 4

What happens when ignition switch is selected to OVRD?

Answer 4

Activates both igniters on the ground or in flight.

Question 5

What is the OFF position of the igniters used for? Can you turn the ignitors OFF inflight?

Answer 5

OFF is used for dry motoring on the ground. It deactivates ignition and inhibits fuel flow. In-flight, the off position is ignored by the FADEC.

Question 6

What controls the engines?

Answer 6

Each engine has a 2-channel FADEC. One channel is active and the other channel remains in standby as a backup. They alternate each engine start.

Question 7

What does the cyan line on the N1 gauge represent during approach? When does it appear?

Answer 7

The minimum N1 bleed requirements in icing conditions. Configured for landing.

Question 8

What sources are available for engine starting? (4)

Answer 8

APU. Ground Pneumatic (huffer cart or air bottle). Cross Bleed. Windmill start

Question 9

What engine start protection does the FADEC provide on the ground? (3) In flight?

Answer 9

Hot. Hung. No Light-off. Protection ONLY on the ground.

Question 10

Describe the engine start sequence.

Answer 10

Start switch momentarily to START:

7% N2 ignition, 20% N2 fuel flow (unless N2 is >120), 20% N2 +5 sec light off, 50% N2 ignition off, starter cutout.

Question 11

What does WML mean on the engine indications?

Answer 11

Windmilling engine. The FADEC has detected a flame-out and is attempting an auto relight, or an assisted start has been commanded

Question 12

What heats the fuel and cools the engine oil?

Answer 12

Fuel/Oil heat exchanger.

Question 13

What is ATTCS?

Answer 13

Automatic Takeoff Thrust Control System. Provides Max Thrust Reserve (RSV). FADEC controlled.

Question 14

When will ATTCS activate?

Answer 14

N1 difference of 15% or more during;

Takeoff, Go-Around, Windshear Warning.

Question 15

When is thrust reverse available?

Answer 15

Weight-on-wheels. Triggers are locked in-flight.

Question 16

What happens if a thrust reverser inadvertently deploys?

Answer 16

FADEC limits respective engine thrust to IDLE.

Question 17

What is FLEX?

Answer 17

Reduced take off thrust based on assumed temperature. Telling the FADEC that it is warmer than it actually is so it will reduce the thrust.

Question 18

What types of engines are on the aircraft?

Answer 18

General Electric CF-34-8E5, high-bypass and dual rotor turbofan.

Question 19

What does the cyan < mean on the N1 gauge?

How about the green - ?

Answer 19

< is Target N1 at TOGA.

- is Target N1 at Max Thrust.

Question 20

What pre-requisite must be met before the engine will turn off when the START/STOP selector is moved to STOP?

Answer 20

The Thrust Lever must be at IDLE.

Question 21

What is the Air Turbine Starter (ATS)?

Answer 21

A turbine that accelerates the engine to a self-sustaining RPM level.

Question 22

What is the starter operation of the engines?

Answer 22

The Starter Control Valve (SCV) opens, providing bleed air to the Air Turbine Starter (ATS) to increase rotor speed for engine start.

Question 23

What does FADEC provide? (3)

Answer 23

Engine protection. Control of the requested and max N1. Control of the ATTCS.

Question 24

How many FADEC channels does each engine have?

Answer 24

2 channels. One channel is active and the other channel remains in standby as a backup. They alternate each engine start.

Question 25

Explain T2.

Answer 25

T2 sensor monitors the engine inlet air temperature for use in FADEC calculations.

Question 26

Explain N1.

Answer 26

N1 sensor provides fan speed data for the FADEC and airplane vibration monitoring system.

Question 27

When do we manually abort an engine start?

Answer 27

OIL! No positive oil pressure indication within 10 seconds after N2 speed starts to increase. Oil pressure stabilizes below engine limits. ITT! Hot start, ITT exceeds >815*C. No light off, no ITT within 30 seconds after initiation of fuel flow. N1/N2! Hung start; N1/N2 failing to accelerate to stable idle speed. Tailwind; positive increase of N1 not indicated before starter cut-out (50% N2). MISCELLANEOUS! Intermittent electrical pneumatic or starter malfunction occurs before the starter disengagement.