Flashcards in CF34-8E5 Deck (22):
Single stage fan
4 stage LP turbine
Describe N2 spool
10 stage compressor ( gas generator)
2 stage HP turbine
2 per engine
Igniters activate for engine start
Ground 1igniter (sw in auto)
Flight 2 igniters (sw in auto)
What happens when ignition sw in override ?
activates both igniters on ground or in Flight
Can the igniters be turned off during flight?
The sw may be moved to the OFF position but the FADEC disregards the command
The OFF position is used for dry motoring on the ground
What does the cyan line on the N1 gage 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?
Ground source (huffer cart or air bottle)
Does the FADEC provide engine start protection?
Only on the ground for a hot start, hung start or no light off
What will the FADEC automatically do in case HOT start?
FADEC will not allow FF if ITT >120 deg C
FADEC will automatically dry motor engine and introduce fuel when ITT
Describe the engine start sequence
Start switch momentarily to start:
7% N2. Ignition
20% N 2 Fuel Flow( + 5 sec Light-off)
50% N2. Ignition off
N1. 27%. ITT 460 degC N2 62%
FF 550 lbs/hr
Oil pressure >25 psi
What does WML mean on the engine indications?
The FADEC has detected a flame out and is attempting an auto re-light, or
An assisted start has been commanded
What provides under speed and overspeed protection?
The FADEC via the FMU
Approximately 52% N2 and 102% N2 respectively
What heats the fuel and cools the engine oil?
Fuel/Oil heat exchanger
What is ATTCS?
What controls it?
Automatic takeoff thrust control system
Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
What will trigger an ATTCS event?
N1 difference > 15% between engines
Engine failure during TOGA
When is thrust reverse available?
Weight on wheels (ground use only)
What happens if reverser inadvertently deploys?
FADEC limits respective engine thrust to IDLE
What engine thrust rating(s) may only be used for 5 minutes?
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?