Engine Flashcards
Max thrust continuous?
13,800 lbs
How much thrust do the engines produce?
13,800-14,200 lbs (ISA)
Describe N1 spool?
Single-stage fan
4-stage LP turbine
Describe N2 spool
10-stage compressor (gas generator)
2-stage HP turbine
How many igniters per engine?
2 per engine
How many igniters activate for engine start?
Ground…..1 igniter (switch in AUTO)
Flight……2 igniters (switch in AUTO)
What happens when the ignition switch is selected to OVRD?
Activates both igniters ON THE GROUND OR IN FLIGHT
Can the igniters be turned off during flight?
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
What controls the engine?
A two-channel FADEC
One channel is active and the other channel remains in standby as a backup
Is only one FADEC channel used every flight?
No, they automatically alternate with each engine start
What does the cyan line on the N1 gauge represent during approach? When does it appear?
The minimum N1 for bleed requirements in icing conditions
Configured for landing less than 1200’ RA ( when anti-ice is ON)
What sources are available for engine starting?
APU
Ground Source (huffer cart or air bottle)
Opposite engine
Windmill start (in flight only)
Does the FADEC provide engine start protection?
Only on GROUND for a hot start, hung start, or no light-off
What will the FADEC automatically do in case of a start on the ground?
FADEC will not allow FF if ITT is greater than 120 degrees C
FADEC will automatically dry motor engine and introduce fuel when ITT is less than 120 degrees C
Describe the engine start sequence
1.start switch momentarily to START: 7% N2......ignition 20% N2 ......fuel flow 20% N2 +5 sec.....light off 50% N2....... Ignition off, Starter Cut-Out
2. Engine stabilizes N1.....27% ITT.....460 degrees C N2.....62% FF.......550 lbs/hour Oil pressure..... Greater than 25 psi
What does WML mean on the engine indications?
Windmilling engine
The FADEC has detected a flame-out and is attempting to auto re-light, or
An assisted start has been commanded
What provides underspeed and overspeed protection?
The FADEC via the FMU
Approximately 52% N2 and 102% N2 respectively
What happens after 3 overspeed detection events?
FADEC will no re-light the engine
What heats the fuel and cools the engine oil?
Fuel/oil heat exchanger
What is ATTCS? What controls it?
Automatic Take-off Thrust Control System
Provides max thrust reserve (RSV) according to current rate previously selected in the MCDU
FADEC controlled
What will trigger an ATTCS event?
N1 difference greater than 15% between engines
Engine failure during TOGA
Windshear detected
When is thrust reverse available?
Weight-on-wheels (ground use only)
What happens if a thrust reverser inadvertently deploys?
FADEC limits respective engine thrust to IDLE
What engine thrust rating(s) may only be used for 10 minutes?
TO-1
TO-RSV (TL beyond TOGA)
GA (two-engine go-around)
GA-RSV (one-engine go-around or windshear)
What is FLEX?
Reduced takeoff thrust based on assumed temperature (telling the FADEC that it is warmer than it actually is so it will reduce the thrust)
Can the FLEX thrust be reduced lower than CLB thrust?
No
What type of engines are on the aircraft?
2 GE CF34-8E5
Hi-Bypass, 2-spool, axial-flow, turbo-fan
Max Thrust RSV?
14,200 lbs at ISA
Thrust reverser speeds? Idle and stow
Idle: 60kts
Stowed: 30 kts
Minimum oil pressure?
25 psi
