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ERJ 170 Engine
CF-34-8E5 Engine questions
| Question | Answer |
|---|---|
| What types of engines are on the aircraft? | • Two General Electric CF-34-8E5• Hi-bypass, 2-spool, axial-flow, turbo-fan |
| 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 < 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 |
| 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 of a Hot start? | • FADEC will not allow FF if ITT >120°C• FADEC will automatically dry motor engine and introduce fuel when ITT <120°C |
| 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 |
| What does WML mean on the engine indications? | • Windmilling engine• The FADEC has detected a flame-out and is attempting an 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 not 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 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 (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 5 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 |
Created by:
rah170
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