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(M) Technical and Resource Knowledge > GE CF-34-8E5 Engine System > Flashcards

GE CF-34-8E5 Engine System Flashcards

1
Q

(B) What types of engines are on the aircraft?

A
  • Two General Electric CF-34-8E5
  • Hi-Bypass
  • 2-Spool
  • Axial-Flow
  • Turbo-fan
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2
Q

(B) How much thrust do engines produce?

A

13,800 - 14,200 lbs. (ISA)

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3
Q

(B) Describe N1 spool?

A

Single-stage fan

4-stage LP turbine

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4
Q

(B) Describe N2 spool?

A

10-Stage Compressor driven by a 2-Stage HP Turbine

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5
Q

(B) How many igniters per engine?

A

2 per engine

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6
Q

(B) How many igniters activate for engine start?

A

Ground - 1 igniter (AUTO)

Flight - 2 igniters (AUTO)

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7
Q

(B) What happens when the ignition switch is selected to OVRD?

A

Actives both igniters on the ground or in flight

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8
Q

(B) Can the igniters be turned OFF during flight?

A

In-Flight - Switch may be moved to OFF but FADEC disregards command
OFF position is used for dry motoring on the ground only

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9
Q

(B) What controls the engine?

A

Full Authority Digital Electronic Control (FADEC - 2 Channels)
One channel is active and the other channel remain in standby as a back-up

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10
Q

(B) Is only one FADEC channel used every flight?

A

No. They automatically alternate with each engine start

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11
Q

(B) What does the cyan line on the N1 gauge represent during approach? When does it appear?

A
  • The minimum N1 for bleed requirements in icing conditions

- Configured for landing less than 1200’ RA (when A/I is ON)

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12
Q

(B) What sources are available for engine starting?

A
  1. APU
  2. Ground Source (Huffer cart or air bottle)
  3. Opposite engine
  4. Windmill
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13
Q

(B) Does the FADEC provide engine start protection?

A

Only on the ground for a hot start, hung start or no light-off

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14
Q

(B) What will FADEC automatically do incase of a start on the ground?

A
  • FADEC will not allow FF if ITT greater than 120°C

- FADEC will automatically dry motor engine and introduce fuel when ITT less than 120°C

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15
Q

(B) Describe the normal engine start sequence?

A 
1 - Start Switch ON then to Run
2 - 7% N2 - Ignition A ON ( FADEC will automatically turn on other ignitor if not light-off or 15 seconds after fuel flow)
3 - 20% N2 - Fuel Flow
4 - 20% N2 + 5 Seconds - Light-OFF!
5 - 50% N2 - Ignition A (B) OFF
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16
Q

(B) When do you know if the engine is stabilized?

A 
N1 - 27% (2)
ITT - 460°C (4)
N2 - 62% (6)
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
FF - 550lbs/hr
Oil Pressure - > 25 PSI
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17
Q

(B) What does VML mean on the engine indications?

A
  1. Windmilling engine
  2. The FADEC has detected a flame out and is attempting an auto-relight
  3. An assisted start has been commanded
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18
Q

(B) What provides underspeed and overspeed protection?

A

1 - The FADEC via the FMU

2 - Approximately 52% N2 and 102% respectively

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19
Q

(B) What happens after 3 overspeed detection events?

A

FADEC will not re-light the engine

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20
Q

(B) What heats the fuel and cools the engine oil?

A

Fuel/Oil heat exchanger

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21
Q

(B) What is ATTCS? What controls it?

A
  • Automatic Take-off Thrust Control System
  • Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
  • FADEC controlled
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22
Q

(B) What will trigger an ATTCS event?

A

1 - N1 difference > 15% between engines
2 - Engine failure during TOGA
3 - Windshear detected

23
Q

(B) When is thrust reverser available?

A

Ground only (Weight-on-Wheels WoW)

24
Q

(B) What happens if a thrust reserver inadvertently deploys?

A

FADEC limits respective engine thrust to IDLE

25
Q

(B) What engine thrust rating(s) may only be used for 10 minutes?

A

1- TO-1
2- TO-RSV (TL beyond TOGA)
3- GA (Two-engine go-around)
4- GA-RSV (One-engine go-around or windshear)

26
Q

(B) What is FLEX?

A

Reduced takeoff thrust based on assumed temperature (Basically telling the FADEC that it is warmer than it actually is so it will reduce the thrust)

27
Q

(I) Why do we FLEX?

A

To conserve and prolong the life of the engine

28
Q

(B) Can the FLEX thrust be reduced lower than CLB thrust?

A

No

29
Q

(T) Describe the engine fuel control system

A
  1. FADEC - Full Authority Digital Electronic Control
  2. FMU - Fuel Metering Unit
  3. PMA - Permanent Magnet Alternator
  4. Engine Sensors
  5. VGA - Variable Geometry Actuator
  6. OBV - Operability Bleed Valve
30
Q

(T) What does the FMU do?

A
  • Controlled by FADEC - It meters and distributes the proper amount of fuel to the injectors under all conditions
  • Controls the fuel SOV in normal conditions
  • Provides overspeed protection
31
Q

(T) What does a PMA do?

A

Provides independent source of power to each engine’s FADEC (28VDC) for start and back-up at approx. 50% N2

32
Q

(I) How many fuel injectors does this aircraft have?

A

18 Fuel Injectors per engine

33
Q

(I) What does the engine system lubricate on this engine?

A

AGB - Accesory Gear Box bearings

5-Turbine Main Shaft Bearing

34
Q

(T) How many oil pumps?

A

1 main pump

4 scavenge pumping elements

35
Q

(I) What’s inside the ACG (not mounted on)?

A

AGB contains:

  1. Oil reservoir
  2. Oil Pumps
  3. Filter
  4. Bypass valve
  5. Fuel-heat exchanger
36
Q

(I) What is mounted on the AGB?

A
  1. Fuel pumps
  2. IDG
  3. Starter (ATS - Air Turbine Starter)
  4. Hydraulic Pump
  5. PMA
37
Q

(I) What controls the start up components?

A 
FADEC controls:
Fuel Flow
Starter
Ignition
Aircraft controls:
Starter control valve
Hydraulic engine driven pump
Switches power to ignition exciters
38
Q

(I) What provides bleed air to the starter?

A
  1. APU
  2. Ground Source
  3. Opposite Engine
39
Q

(T) When does the Hot Start protection commence?

A

ITT > 815°C on ground

40
Q

(T) What kind of Thrust Reverser do we have?

A

Cascades with Transcowls

41
Q

(T) What is a VGA and what does that do?

A

Variable Geometry Actuator and it’s purpose is to optimize the position of the compressor stators for N1 for efficiency

42
Q

(I) How are the thrust reversers powered?

A

Hydraulically - HYD SYS 1 for Engine 1 - HYD SYS 2 for Engine 2 respectively

43
Q

(I) What is the highest engine thrust possible?

A

GA-RSV

44
Q

(T) What are the IDLE Modes?

A

Flight Idle
Approach Idle
Final Approach Idle
Ground Idle

45
Q

(O) When must you stow MAX Thrust?

A

60 knots

46
Q

(O) When must you stow Min Thrust?

A

30 knots

47
Q

(I) Explain approach idle?

A 
Enables rapid acceleration to go-around thrust. Activates:
1 - > 15,000 ft.
2 - Flaps 1 or greater
3 - Landing Gear down 
It compensates for icing automatically
48
Q

(I) When is Final Approach Idle active?

A
    • > 1,200 ft.
      2 - Landing Flaps
      3 - Landing Gear Down
      It does not compensate for icing but displays minimum target speed for bleed air
49
Q

(I) Max Reverse TLA?

A

.5°

50
Q

(I) Idle TLA?

A

22°

51
Q

(I) When does ATTCS engage the clutches to move the TLA to TOGA?

A

50°

52
Q

(O) Can you flex all the time?

A

No, prohibited on contaminated runways

53
Q

(I) What is the limitation on FLEX?

A

Cannot exceed 25% of the full takeoff thrust

54
Q

(O) Engine Starter Duty Cycle Limits?

A 
1 - 90 sec ON/10 sec OFF
2 - 90 sec ON/10 sec OFF
3 - 90 sec ON/5 min OFF
4 - 90 sec ON/5 min OFF
5 - 90 sec ON/5 min OFF
- 120 sec ON in flight -

(M) Technical and Resource Knowledge (15 decks)

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