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What engines are on the Saab 340? 14-1
GE CT7-9B
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How much power do the CT7-9B engines produce? 14-1
1750 SHP at 35C at sea level
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What controls the intel variable guide vanes? 14-1
HMU
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How many fuel pumps are installed on each engine? 14-2
2
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What fuel pumps are installed on each engine? 14-2
HMU HP Pump and Main Fuel Pump
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How many fuel pumps are on the Saab 340? 14-2 & 9-10
6
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What is used to prevent bird ingestion into the engine? 14-3
Inlet protection device (interial separator)
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Where are objects directed after being caught in the inlet protection device? 14-3
Overboard through a duct on the underside of the nacelle
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Where do items such as sand and hail exit after being seperated from the airflow? 14-3
Through the separator duct and out the tailpipe
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What prevents power levers from being retarded below flight idle in flight? 14-4
Automatic Flight Idle Stop
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The Flight Idle Stop will automatically open at touchdown with what inputs? 14-4
- Both main gear down lock switches
- Anti-skid computer (for wheel speed monitoring)
- Both WOW systems
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What is the placarded operating range for the power levers? 14-4
REV, GND, FLT IDLE
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What position on the power lever is identified by a detent? 14-4
GND IDLE
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How is the FI Stop opened with a WOW failure? 14-5
By pulling the FI STOP OVRD knob
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When is the FI Stop automatically opened? 14-5
- When either main gear is down and locked AND:
- Any wheel speed exceeds 25 kts OR either WOW detects the A/C is on the ground
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If the gear is not retracted when does the FI stop automatically close? 14-5
- Both WOW systems detect the A/C is airborne
- All wheel speeds decrease below 9 kts
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What indication is given if while on the ground with the FI STOP OVRD knob pulled, the left engine is started? 14-6
A red CONFIG warning
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Can the CONFIG warning be cancelled for a FI STOP OVRD knob pulled while starting the left engine? 14-6
No, the condition lever must be returned to fuel off
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What is the placarded operating range for condition levers? 14-6
FUEL OFF, FEATHER, START, UNF, MIN-MAX, T/M
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The engine driven alternator supplies the Engine Electrical System through a seperate for the operation of what? 14-7
- Ignition exciter power supply
- DECU power supply
- ENG (Ng) indicator signal
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Are there any controls or indications for the Engine Electrical System? 14-7
No
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What are the three modes of the igntion system? 14-9
Start Ignition, Auto Ignition, Continuous Ignition
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When is Start Ignition available? 14-9
When the switch is in NORM, ignition is activated when the start relay closes and terminates when the start relay opens at the end of a start cycle
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Auto ignition occurs when the DECU detects what?
Engine flameout or Np over speed
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How long is Auto Ignition activated for? 14-9
At least 7 seconds
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When is Continuous Ignition active? 14-9
When the switch is selected to CONT or when power is lost from the respective battery bus
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When will the respective IGN light illuminate on the status panel? 14-9
- Anytime the switch is selected to CONT or when NORM is selected and any of the following occur:
- Engine Start Cycle
- Auto Relight is activated
- Control power is lost
- The power tubine over speeds
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What is used to preventy fuel filter icing? 14-10
Fuel Heater
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What is the heat source for the fuel heater? 14-10
Prop gear box oil
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Is fuel eating pilot controlled? 14-10
No, it is automatically regulated by a thermal sensor
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Can the engine operate without a working main pump? 14-10
Yes, standby pressure is sufficient
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Can the engine operate without a HP pump from the HMU? 14-10
No
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What functions does the HMU provide? 14-10
- -Fuel scheduling for the metering valve of Ng governing
- -Controls actuation of the inlet guide vanes and AI/SBV
- -Protects the gas generator spool from over speeding
- -Accomplishes engine shutdown by means of fuel shutoff valve
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How does the HMU protect the gas generator from over speeding? 14-10
By automatically shutting fuel off at 110% Ng
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The DECU accomplishes what functions? 14-12
- Np over speed protection
- Auto ignition
- Bottom governing
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At what speed does the DECU shut off fuel for Np over speeding? 14-12
25000 power tubine RPM or 1572 PRPM
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When will the fuel shut off valve be reopened due to a prop over speed? 14-12
When power turbine RPM decreases below 25000 RPM
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What prop RPM does bottom governing maintain? 14-12
Min. of 1040 PRPM
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During maximum reversing prop RPM increases to what RPM? 14-12
1200 PRPM
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Where must the condition lever be in order to obtain bottom governing? 14-12
MIN-MAX range
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What is the function of Bottom Governing? 14-12
To maintain a minimum prop RPM during taxi and reverse operations.
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What controls CTOT and APR operation? 14-13
The DECU through the HMU torque motor
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If a flameout should occur what % increase does the APR provide? 14-13
7% increase to the operating engine
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What procedure is done to correct a DECU failure that is causing over-temp, over-torque or prop over-speed? 14-13
Torque motor lockout
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While in T/M range where is fuel vented to? 14-13
Fuel is vented overboard so it is important to not stay in T/M range
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Does T/M lockout affect propeller governing? 14-13
No
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What "normal" functions will be lost if operating in the T/M lockout? 14-13
Bottom governing, CTOR and APR
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Before selecting the CTOT switch to ON or APR power should be set to? 14-14
Within 15-20% of target torque, but no lower than 75%
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What temperature will the CTOT limit the engine to? 14-14
955 degrees C
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Does the CTOT provide torque and temp protection during T/O and GA? 14-14
Yes, it will increase to selected torque value or 955 degrees C whichever occurs first.
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Does the Autocoarsen switch have to be on to achieve APR function? 14-14
Yes
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What is indicated by an oil pressure gauge reading zero without a CWP light on? 14-15
Failure of the oil pressure gauge
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With a leak in oil pressure what would typically be noticed? 14-15
Pressure dropping to around 20psi and fluctuating, followed by either constant or decreasing oil temp due to air being introduced into the line
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How is scavange oil cooled? 14-15
By an oil-to-fuel cooler and then directed to the inlet frame vanes to aid in inlet anti-icing which further cools the oil
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Of the 5 quarts in the prop gear box reservoir how much is kept for a reserve for emergency feathering? 14-17
1 quart
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With the PL above FLT IDLE what psi triggers an OIL PRESS CWP? 14-18
25 psi
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With the PL below FLT IDLE what psi triggers an OIL PRESS CWP? 14-18
Below 7 psi
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What is a characteristic of a pressure transducer failure for the oil system? 14-18
Indication will rapidly go to zero or to the upper limit of the gauge
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What is indicated by an illuminated ENG OIL PRESS light on the CWP? 14-18
The associated prop gear box OR engine oil pressure is low
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What is the governer speed control range? 14-19
1150 to 1396 PRPM
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On the Dowty props what is used to drive the engine to feathered position? 14-19
Prop oil pressure
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With a loss of prop oil pressure will the prop feather when CL is in fuel off? 14-20
Yes
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How is the prop feathered after a loss of prop oil pressure? 14-20
Using the MAN FEATHER pump
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What are the 2 different modes for Autocoarsen system? 14-29
High or low power modes
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AUTOCOARS LOW light illuminates when which conditions exist? 14-30
- One or both PLA less than 64 degrees
- Ng greater than 55% on both engines
- Starter/gen rpm greater than 60% on both engines
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Autocoarsen is activated in low mode when which conditions exist? 14-30
- Ng less than 55% on the failed engine
- Starter/gen rpm less than 60% on the failed engine
- Ng greater than 55% on operarting engine
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What would cause the prop to un-coarsen? 14-30
The AUTOCOARSEN switch is selected to OFF
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What conditions must be met for the AUTOCOARS HIGH light to illuminate? 14-31
- PLA greater than 64 degrees
- Torque at least 50%
- P3 more than 120 psi
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Autocoarsen is activated in high mode if what conditions exist? 14-31
- PLA greater then 64 degrees on both engines
- Torque greater than 50% on operating engine
- Torque less than 50% on the failed engine
- Torque differential greater than 25% between engines
- P3 less than 120 psi on the failed engine
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What is indicated by an illuminated AUTOCOARS CWP light? 14-31
Autocoarsen computer has failed
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What is used to keep both props at the same RPM? 14-32
A prop syncrophaser
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Which prop is considered the Master prop in the synchrophasing system? 14-32
The left prop is the master and controls the right prop (slave) *Hamilton Standard*
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What does the phasing portion of the prop sync do? 14-33
Positions the blades so only one blade crosses the wing root at a time between both engines
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At what tempature do the ENGINE OV TEMP lights illuminate? 14-34
962 degrees celsius
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Which engine gauge operates in digital and analog? 14-34
ITT
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