Engines Flashcards
What types of engines are on the ERJ 175?
GE CF-34-8E5
How much thrust do the engines produce?
13800-14200 lbs ISA
Describe N1 Spool
- Single stage fan
- 4 stage LP turbine
Describe N2 spool
- 10 Stage compressor
- 2 stage High pressure turbine
How many igniters per engine?
2
How many igniters activate for engine start?
- Ground - 1 igniter (switch in auto)
- Flight - 2 igniters (switch in auto)
What happens when the igniters switch is selected to override?
Activates both igniters on the ground or inflight
Can the igniter be turned off inflight?
The switch may be moved to the off position but the FADEC will ignore it
(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 is in standby
Is only one FADEC channel used every flight?
No they automatically alternate with every flight
What does the CYAN line on the N1 gauge represent on approach?
When does it appear?
The minimum N1 bleed requirements in icing conditions
Configured for landing
What Air sources are available for starting?
- APU
- Ground source
- Opposite engine
- Windmill start
Does the FADEC provide engine start protection
Only on the ground for:
- HOT START
- HUNG START
- NO LIGHT OFF
What will the FADEC automatically do in case of a start on the ground?
- FADEC will not allow FF if ITT > 120c
- FADEC will automatically dry motor engine and introduce fuel when ITT >120c
Describe the engine start sequence
- Start switch momentarily to START
- 7% N2……………….Ignition
- 20% N2…………….Fuel Flow
- 20% N2 +5 sec…Light off
- 50% N2 …………….Ignition off
Engine Stabilizes at?
- N1………………….27%
- ITT…………………460c
- N2 ………………..62%
- Fuel Flow………550 pph
- Oil pressure…. > 25 PSI
What does WML mean on the engine indications
Windmilling engine
The FADEC has detected a flame out and is attempting to auto-relight or The assisted start has been commanded
What provides the 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 not relight the engine
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-FADEC Controlled
What will trigger an ATTCS event?
- N1 difference > 15% between engines
- Engine failure during TOGA
- Windshear detected
When is thrust reverse available?
Weight on wheels (WOW)
What happens if a thrust reverser inadvertently deploys?
FADEC limits respective engine thrust to idle
What engine thrust ratings 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 thrust takeoff based on assumed temperature
(telling FADEC that it is warmer than it actually is so it will reduce thrust)
Can the FLEX thrust be reduced lower than CLB thrust
No
Minimum N2
58.50%
Maximum N2
99.40%
Maximum N1
99.50%
Maximum N1 w/breaks applied
60%
Starter Duty Cycle
On the ground: Attempts 1 & 2: 90 seconds on / 10 seconds off
Attempts 3 - 5: 90 seconds on / 5 minutes off
Inflight: 120 seconds on / 10 seconds of
120 seconds on / 5 minutes off
Maximum ITT Start Tempurature
815c
Maximum Continuous ITT
960c
Maximum T/O & G/A Tempurature
990c (10 minutes)
1006c (first 2 minutes)
Minimum Oil Pressure
25 psi
Maximum Oil Pressure
95 psi
Maximum Transient Oil Temperature
163c (for 15 minutes)
Maximum Continuous Oil Tempurature
155c
