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T45C IJET > Engines > Flashcards

Engines Flashcards

1
Q

Describe T45C main components

A
  1. Single Engine
  2. Non-After Burning
  3. 2 stage low px (N1) - > Driven by single-stage low px turbine
  4. 5 Stage high px (N2) compressor - Driven by single stage high px turbine
  5. N1 and N2 on concentric shafts and can spin freely
    1. Spin CW
  6. Produces installed static sea level thrust of 5527#’s
  7. 100 percent N2 is 15,512 rpm
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2
Q

Installed static sea level thrust

A

5,527 pounds

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3
Q

RPM of N2 at 100%

A

15,512 RPM

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4
Q

When does the bleed valve close?

A

61±4%

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5
Q

What indicates the bleed valve is closed?

A
  1. N2 idle rpm increase ~3%
  2. EGT decreases 50*C
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6
Q

When does the bleed valve close?

A

Once N2 reaches ~45% RPM during engine shutdown

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7
Q

Does the bleed valve remained closed at all flight regimes?

A

No the bleed valve will open dyuring airstart when the GTS start button is pressed.

It will remain open for 60 seconds after button release

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8
Q

What does the bleed air system do?

A
  1. Bleed air from N1 and N2 is used to seal compressor and turbine bearing compartments
  2. Provide cooling for turbine assemblies
  3. N2 (5th Stage) supplies the bleed air for the
    1. environmental systems and
    2. OBOGS/anti-g systems
    3. fuel tank pressurization
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9
Q

What stage provides the bleed air for the environmental systems?

A

N2 5th

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10
Q

What does the bleed air from the N2 5th stage do?

A

Gives bleed air for

  1. Environmental system
  2. OBOGS/antiG
  3. Fuel tank pressurization
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11
Q

When is the steam ingestion bleed valve open?

A
  1. Launch bar is not retracted
  2. WOW
  3. N2 RPM above 70%
    1. Provided by the 70% N2 switch
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12
Q

What caution light is associated with the steam ingestion valve?

A
  1. ACCEL caution light when the valve position does not match the commanded position
  2. 2 second delay prevents transient warning
  3. ACCEL indicates
    1. Steam Ingestion valve not in commanded position -or-
    2. shot of fuel solenoid is not in the commanded position
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13
Q

Describe the engine Anti-Ice system

A
  1. A small flow of bleed is air is continuously ducted through the fan N1 shaft spinner.
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14
Q

What is connected to the Engine Accessory Gear Box?

A
  1. Hydraulic pumps
  2. DC Generator
  3. LP Fuel pump
  4. HP Fuel pump
  5. Engine Oil Pumps
  6. N2 RPM Tachometer
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15
Q

How does the air turbine starter transmit power to rotate the N2 Shaft?

A

Through the accessory gear box

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16
Q

What makes of up the engine fuel system?

A
  1. LP fuel pump
  2. Fuel cooled oil cooler
  3. LP fuel filter
  4. HP fuel pump
  5. FCU
  6. 18 spray nozzles in the engine combustion chamber
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17
Q

Caution asscoiated with Low Pressure pump

A

LP PMP - Fuel pressure drops below 35 PSI

18
Q

What type of fuel system does T45 have?

A

Flow scheduling type with acceleration control

19
Q

What schedules fuel and how does it do it?

A
  1. Fuel Control Unit
  2. Uses throttle position and compensates the flow for
    1. Altitude
    2. Airspeed
20
Q

What controls engine acceleration?

A
  1. 75 GPH shot of fuel solenoid
  2. Throttle valve dashpot and hydromechanical acceleration swithc
21
Q

What does the shot of fuel solenoid do?

A

Provides increased fuel flow to reduce engine aceleartion time and provide improved engine surge contorl

22
Q

What does the throttle valve dashpot do?

A

Ensures that the throttle valve opens at a rate to give the max stall free acceleartion regardless of the rate of throttle movement.

23
Q

Shot of fuel solenoid altitudes of operation

A
  1. Always open below 7200’ MSL
  2. Open on the ground and remains open until climbing through 9500 ±300’MSL and reopens when descending 7700±500’ MSL
  3. Acuated to approach mode when below 6500’
24
Q

When does MFUEL caution come on?

A

When manual fuel system is selected

25
How does manual fuel system work?
The system bypasses the control elements downstream of HP pump. There is no automatic control of 1. N1 2. N2 3. EGT All fuel metering is done with direct conection to throttle setting
26
How is engine operation different when using the manual fuel system vs the main fuel system?
1. Airstarts may require throttle modulation due to bypassing of the Sub Idle Fuel Control Unit (SIFCU) 2. Retarding the throttle to IDLE results in lower than normal idle N2 rpm 3. Dashpot accel is inop so engine accel **at lower altitude are significantly slower than usual** 1. **​at higher altitudes it will be faster** 4. **​****Bleed valve**remains closed at all engine speeds expect during airstat when it is held open with**60 second timer** 5. To keep N1 within limits 1. **N2 RPM** should **not** exceed **95%** below **20,000' MSL** 2. -or- **90%** above **20,000' MSL**
27
Can you start the engine with the manual fuel system?
No NATOPS prohibits
28
Can you switch to MFUEL with complete loss of electrical power?
No.
29
What is the SIFCU and what does it do?
Sub Idle Fuel Control Unit and it meters fuel to spray nozzles during the start cycle
30
What is the ECA and what does it do?
Engine Control Amplifier and it automatically prevents **overspeed** and **overtemp** conditions by controling fuel flow.
31
What does the ECA monitor?
N1 shaft speed and two sets of thermocouples located behind the N1 turbine section
32
33
What sets off the EGT/RPM caution light?
When ECA reads EGT \> 650±8\*C or N1 \>112.4±1%
34
What is the total oil capacity?
25.2 US pints
35
How much is the unusable oil?
9.6 US pints
36
Max Oil Consumption
Max oil consumption rate is 0.8 US pint/hour
37
How many sacavenge pumps are there?
3
38
How does the OIL PRESS warning work?
If the differential of the scavenge oil and the internal gearbox drops below **10 PSI**
39
How many igniters are there?
Two 12 joul dc ignition units
40
What controls the ingntion?
ECA and starter control unit
41
Weight on wheels ignition conditions
1. The GTS start button is pressed, ignition ceases immediately when the button is released 2. The **ENGINE** switch is set to START and the **READY** advisory lightis on. 1. Ignition is continuous until the engine reaches **45% RPM** or after **45 seconds** when igntion terminated and **GTS** returns to idle
42
When is ignition provided in the air? (Weight off Wheels)
1. GTS start button is pressed and continues for 30 seconds after the button is released 2. **ENGINE** switch is set to **START** and the **READY** advisory light is on. Ignition is continuous until engine reaches 45% N1 or after 45s when ignition auto terminated and GTS idles

T45C IJET (12 decks)

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