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39 Cards in this Set
- Front
- Back
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What flows through the fuel heater strainer? |
Fuel Oil |
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What action must be carried out prior to fuel heater strainer servicing? |
The engine T handle must be pulled |
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Indications of primary fuel pump failure? |
Paralleling indications on above 65% SSC 65% switch failure Paralleling px switch U/S Paralleling valve stuck closed |
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The fuel pumps are in series at what RPM? |
0-16% RPM >65% RPM |
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What component is bypassed when the scroll pump fails? |
LP fuel filter |
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Functions of the secondary check valve? |
*Prevents secondary pump flow returning to the inlet if the primary pump fails *Provides alternative inlet to primary pump in secondary pump failure *Provides additional inlet to primary pump during series operation *Provides the inlet to the primary pump during paralleling operation |
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Secondary pump failure is indicated in the flight deck by? |
No paralleling light on the next start |
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2 types of fuel pumps are? |
Gear and scroll |
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2 precautions to be taken with the FCU temp probe? |
*Keep it with the unit when FCU is removed *Don't excessively bend the line |
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3 field adjustments of the FCU? |
*Over speed governor RPM *LSGI RPM adjuster *Minimum flow stop |
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4 mechanical inputs to the FCU metering valve? |
*Air px *Air temp *Throttle position *Engine RPM |
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2 causes of paralleling light staying on? |
*Primary pump failure *SSC 65% switch failure *Paralleling px switch U/S *Paralleling valve stuck closed |
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What component in the FCU is bypassed when fuel enrichment is used? |
Metering valve |
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Which FCU component schedules fuel flow during engine start cycle? |
Speed servo system |
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What factors control metering of fuel at normal RPM in the flight range? |
*Throttle position *Air temp *Air px |
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What is the precaution to be observed when carrying out overspeed governor adjustment? |
Never fully remove the tab securing screw |
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2 systems in the FCU that require px from the servo px regulating valve? |
*Speed servo *Px servo |
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Purpose of 9° and 30° switches in throttle quadrant? |
Range for LSGI. When past the range the engine automatically spools up to HSGI. |
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2 sections of the FCU that compensate for air entering the engine? |
*Air inlet px servo system *Air inlet temp compensation system |
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What is responsible for rotating the metering valve? |
Air px |
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T/F? - The part throttle scheduling cam and acceleration cam control fuel flow between takeoff and reverse? |
False |
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T/F? - The governor scheduling cam prevents selection of LSGI when power lever is in max reverse? |
False |
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T/F? - The part throttle setting cam is rotated by the power lever? |
False |
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Purpose of the FCU bypass valve? |
To maintain a constant PD across the metering valve |
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What component terminates fuel enrichment and when? |
50 PSI px switch in the fuel manifold |
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Which potentiometers control temp controlling function? |
1000 ohm, bias and slope |
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T/F? - Electronic fuel correction light illuminates for overtemp in locked? |
True |
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T/F? - Electronic fuel correction light is extinguished above crossover (66°) in null mode? |
True |
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T/F? - Electronic fuel correction light is extinguished below crossover in auto mode? |
False |
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Purpose of the 66° microswitch in the coordinator? |
Crossover (changes the TD system between temp limiting and temp controlling) |
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What must be done to the TD valve after FCU change? |
The null orifice must be reset to zero |
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Purpose of the 1000 ohm pot? |
Provides temp reference signal to the TD amp |
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Effect on torque, TIT and fuel flow if engine anti ice is selected on in temp controlling mode? |
TIT same, lose fuel flow and torque |
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3 conditions for the TD valve to put 15% fuel? |
Above crossover, TD switch auto, running at normal RPM |
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Reason for adjusting TD valve null orifice? |
Hot or cold starts |
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Why pull the fuel flow transmitter CB if doing maintenance on the system? |
Turns the motor off to prevent it from running dry (lack of lubrication) |
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When is the fuel manifold drain valve energised? |
16-65% RPM |
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Precaution to be observed when fitting fuel nozzles? |
Avoid touching the end with the holes |
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While in temp limiting what is the TD valve able to do? |
Put fuel *Take fuel* Null fuel Both take and put |
