Term
| What engine is installed on the LJ35 and what is the rated thrust? |
|
Definition
- TFE731-2-2B OR 2C
- 3,500lbs of thrust at sea level up to 72 degrees F |
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Term
| Concerning the -2C DEEC fuel computers, what are the buffer (memory) limits? |
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Definition
- 40 cycles and the fuel computer light flashes at slow interval.
- 50 cycles and the buffer overwrites the oldest cycles. |
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Term
| What are the engine starter limits? |
|
Definition
1 minute
1 minute
15 minutes
1 minute
1 minute
60 minutes |
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Term
| What activates the igniters during a normal engine ground start? |
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Definition
| Moving the thrust levers from cutoff to idle. |
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Term
| What is the purpose of the soft start protection and explain its operation? |
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Definition
| To prevent shearing the tower shaft. DC voltage is reduced to 12VDC for 1.5 seconds when the start sequence is initiated. |
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Term
| When may engine sync not be used? |
|
Definition
- Takeoff
- Landing
- Single engine operation |
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Term
| What is the maximum continuous cruise ITT? |
|
Definition
-2B: 795 degrees C recommended, 832 degrees C for 30 minutes recommended, 832 degrees C Do not exceed maximum N1
-2C: 827 degrees C recommended, 865 degrees C for 30 minutes recommended, 865 degrees C Do not exceed maximum N1 |
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Term
| What does a slow flashing fuel computer light represent on the -2C DEEC fuel computers? |
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Definition
| The fuel computer buffer (memory) is full and needs to be downloaded. |
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Term
| what is the power source for the oil pressure gauge? |
|
Definition
|
|
Term
| What type of engine oil is utilized in the TFE731? |
|
Definition
|
|
Term
| What is the normal oil temperature range? |
|
Definition
(30-127)degrees C
Note: (127-139)degrees C is yellow caution range and 140 degrees C is redline. |
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|
Term
| When should the oil level be checked? |
|
Definition
| Within one hour after shutdown, preferably 15 minutes up to one hour after shutdown. |
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|
Term
| If the fuel computer fails, what protection do you loose? |
|
Definition
- Ultimate overspeed protection (109% N1 or 110% N2) is lost
_ You will still have the mechanical overspeed governor protection (105% N2) |
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Term
| What engine systems are affected when a Fuel computer fails? |
|
Definition
- Ultimate overspeed protection is lost
- Over temperature protection is disabled
- Engine response is slower
- Single engine takeoff, climb and landing performance are degraded
- Fuel consumption is affected
- Surge bleed valve fails to 1/3 open
- SPR is disabled
- Engine sync |
|
|
Term
| What are five major components of the TFE731-2 engine and how many bearings do they rest on? |
|
Definition
- Spinner and Fan (11,502 RPM)
- Low pressure spool (N1)(20,688 RPM)
- High pressure spool (N2)-2B(29,692 RPM) -2C(30,100 RPM)
- Annular combustion Chamber
- Transfer gearbox and Accessory gearbox
- 6 bearings |
|
|
Term
| How many duplex fuel atomizers supply fuel for the combustion chamber? |
|
Definition
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|
Term
| How many thermocouples, which are located between the high pressure turbine(N2) and the low pressure turbine(N1), measure ITT? |
|
Definition
|
|
Term
| What are the approximate thrust percentages between the core and the fan? |
|
Definition
- At Sea Level: Fan=60% Core=40%
- At FL 400: Fan=40% Core=60% |
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Term
| Why is the engine core rotation clockwise and the fan rotation counterclockwise(as viewed from aft)? |
|
Definition
| Smaller engine mounts are utilized because of the counteracted torque. If part of the engine seizes, the torque is counteracted and will not shear the engine from its mounts. |
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Term
| A solid-state, high energy ignition system consists of a dual ignition exciter(induction vibrator) mounted on the engine and two igniter plugs in the combustion chamber. What are the locations of the ignitors on the engine as viewed from aft? |
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Definition
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|
Term
| What is the apporximate voltage output of the induction vibrator? |
|
Definition
- Input= 28VDC
- Output= (18,000 to 24,000) VDC |
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|
Term
| The oil reservoir and oil system quantities are what? |
|
Definition
- Reservoir= 1.5 gallons or 6 quarts
- System= 3.0 gallons or 12 quarts |
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|
Term
| If outside temp is less than -25 C, how long must engine warm up? |
|
Definition
|
|
Term
|
Definition
| "OFF"- for T/O, Landing and single engine operations |
|
|
Term
|
Definition
- .05 Gal/Hr
- .1875 QTS/Hr over 15 hour period |
|
|
Term
| Max Continuous Temp(ITT)? |
|
Definition
| 832 C (795 C Recommended) |
|
|
Term
|
Definition
| 860 C (870 C for 10 seconds) |
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