Engines Flashcards
What type of engines are on the aircraft?
GE CF-34-8E5
Hi-bypass, two spool, axial flow, turbo fan
How much thrust do the engines produce?
13,800 - 14,200
Describe N1 spool
Single stage fan
Four stage LP turbine
Describe N2 spool
Ten stage compressor
Two stage HP turbine
How many igniters per engine?
2 per engine
How many igniters activate for engine start?
Ground: 1
Flight: 2
What happens when ignition switch is set to OVRD?
Activates both igniters on ground or in flight
Can the igniters be turned off during flight?
FADEC disregards off command
What controls the engine?
A two-channel FADEC
What does the cyan line on the N1 gauge represent during approach? When does it appear?
Min N1 for bleed requirements in icing
Configured for landing and
What sources are available for engine starting?
APU
Ground source
Opposite engine
Windmill start
Does the FADEC provide engine start protection?
Only on the ground for a hot start, hung start or no light off
What will FADEC automatically do in case of a hot start?
FADEC will not allow FF if ITT > 120 deg
FADEC will automatically dry motor engine and introduce fuel when ITT
Describe the engine start sequence
7% N2: Ignition on
20% N2: Fuel flow
20% N2 + 5 sec: Light off
50% N2: Ignition off
What does WML mean on engine indications?
Windmilling engine
The FADEC has detected a flame-out and is attempting an auto re-light, or assisted start has been commanded
What provides overspeed and underspeed protection?
The FADEC via the FMU
Approximately 52% N2 and 102% N2 respectively
What happens after 3 overspeed detection events?
FADEC will not relight the engine
What heats the fuel and cools the engine oil?
The fuel/oil heat exchanger
What is ATTCS? What controls it?
Automatic take-off thrust control system
Provides max thrust reserve according to current rate previously selected via the MCDU
FADEC controlled
What will trigger an ATTCS event?
Thrust difference > 15% between engines
Engine failure during TOGA
Windshear detected
When is thrust reverse available?
WoW (ground use only)
What happens if a thrust reverser inadvertently deploys?
FADEC commands thrust to idle on affected engine
What engine thrust ratings may only be used for 10 minutes?
TO, TO-RSV, GA, GA-RSV
What is FLEX?
Reduced TO thrust based on assumed temperature
Can FLEX thrust be reduced lower than CLB thrust?
No