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What engines are on the Saab 340B
GE CT7-9B
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How much power do the CT&-9B engines produce
1750 SHP at 35C at sea level
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What controls the inlet variable guide vanes
Hydro mechanical unit (HMU)
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How many fuel pumps are installed on each engine
2 (3 if you include the STDBY pump in the hopper tank)
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What fuel pumps are installed on each engine
HMU HP pump and Main fuel pump
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How many fuel pumps are there on the Saab 340
6, 2 standby pumps, 2 main pumps, and 2 HMU HP pumps
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What is used to prevent bird ingestion into the engine
Inlet protection device (inertial separator)
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Where are objects directed after being caught in the inlet protection device
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 separated from airflow
Through the separator duct and out the tailpipe
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What prevents power levers from being retarded below flight idle in flight
Automatic Flight Idle Stop
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The Flight Idle Stop automatically opens at touchdown with what inputs
- Both main gear down lock switches
- Anti-skid computer (for wheel speed monitoring)
- Both weight-on-wheel systems
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What is the placarded operating range for the power levers
REV, GND IDLE, FLT IDLE
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What position on the power lever is identified by a detent
GND IDLE
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How is the FI Stop opened with a WOW failure
By pulling the FI STOP OVRD knob
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When is the FI Stop Automatically opened
- When either main gear is down and locked AND
- Any wheel speed exceeds 25kts OR
- Either WOW detects the A/C on the ground
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If the gear is not retracted when does the FI stop automatically close
- 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 groundwith the FI STOP OVRD knob pulled, the left engine is started
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
No, the condition lever must be returned to FUEL OFF
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What is the placarded operating range for condition levers
FUEL OFF, FEATHER, START, UNF, MIN-MAX, T/M
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The engine driven alternator supplies the Engine Electrical System through 3 separate outputs for the operation of what?
- 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
No
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What are the three modes of the ignition system
Start ignition, Auto ignition, Continuous ignition
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When is Start Ignition available
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
7 seconds
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When is Continuous Ignition active
When the switch is selected to CONT or when power is lost from the respectivw battery bus
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When will the respective IGN light illuminate on the status panel
- 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 turbine over speeds
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What is used to prevent fuel filter icing
Fuel Heater
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What is the heat source for the fuel heater
Prop gear box oil
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Is fuel heating pilot controlled
No, it is automatically regulated by a thermal sensor
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Can the engine operate without a working main pump
Yes, stanby pressure is sufficient
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Can the engine operate without a HP pump from the HMU
No
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What functions does the HMU provide
- Fuel scheduling though the metering valve for Ng governing
- Controls actuation of the inlet guide vanes and anti-ice start beed valve
- Protects the gas generator spool from over speeding
- Accomplishes engine shutdown by means of the fuel shutoff valve
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How does the HMU protect the gas generator from over speeding
By automatically shutting fuel off at 110% Ng
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The DECU accomplishes what functions
- 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
25000 power turbine RPM or 1572 PRPM
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When will the fuel shut off valve be reopened due to a prop over speed
When the power turbine RPM decreases below 25,000 RPM
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What prop RPM does bottom governing maintain
Minimum of 1040 PRPM
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During maximum reversing prop RPM increases to what RPM
1200 PRPM
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Where must the condition lever be in order to obtain bottom governing
MIN-MAX range
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What is the function of Bottom Governing
To maintain a minimum prop RPM during taxi and reverse operations
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What controls CTOT and APR operation
The DECU through the HMU torque motor
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If a flameout should occur what % increase does the APR provide
7% to operating engine
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What procedure is done to correct a DECU failure that is causing over-temp, overtorque, or prop over speed
Torque motor lockout
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While in T/M range where is fuel vented to
Fuel is vented overboard so it is important not to stay in the T/M range
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Does T/M lockout affect propeller governing
No
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What "normal" functions will be lost while operating in T/M lockout
Bottom governing, CTOT and APR functions
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Before selecting the CTOT switch to ON or APR, power should be set to
Within 15-20% of target torque, but no lower than 75%
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What temperature will the CTOT limit the engine to
955C
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Does the CTOT provide torque and temp protection during T/O and GA
Yes, it will increase to selected torque value or 955C whichever occurs first
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Does the Autocoarsen switch have to be on to achieve APR function
Yes
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What is indicated by an oil pressure gauge reading zero without a CWP light on
Failure of the oil pressure gauge
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With a leak in oil pressure what would typically be noticed
Pressure dropping to around 20psi and fluctuating, followed by either constant or decreasing oil temp due to air being introduced into that line
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How is scavenge oil cooled
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
1 quart
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With the PL above FLT IDLE what psi triggers an OIL PRESS CWP
Below 25 psi
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With the PL below FLT IDLE what psi triggers an OIL PRESS CWP
Below 7 psi
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What is a characteristic of a pressure transducer failure for the oil system
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
The associated prop gear box OR engine oil pressure is low
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What is the governor speed control range
1150 to 1396 PRPM
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On the Dowty props what is used to drive the engine to the feathered position
Prop oil pressure
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With a loss of prop oil press will the prop feather when CL is in fuel off
No
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How is the Prop feathered after a loss of Prop oil pressure
Using the MAN FEATHER pump
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What are the 2 different modes for the Autocoarsen System
High or Low power modes
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AUTOCOARS LOW light illuminates when which conditions exist
- One or both PL less than 64 degrees
- Ng greater than 55% on both engines
- Starter/ Generator RPM greater than 60% on both engines
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Auto coarsen is activated in low mode when which conditions exist
- Ng less than 55% on failed engine
- Starter/ Generator RPM less than 60% on the failed engine
- Ng greater than 55% on operating engine
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What would cause the prop to "un-coarsen"
- P3 increases to greater than 120 psi on the failed engine AND
- Torque increases above 50% on the failed engine OR
- The AUTOCOARSEN switch is seleted to OFF
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What conditions must be met for the AUTOCOARS HIGH light to illuminate
- PL greater than 64 degrees
- Torque at least 50%
- P3 less than 120 psi
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Auto coarsen is activated in high mode if what conditions exist
- PL greater than 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
Autocoarsen computer has failed
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What is used to keep both props at the same RPM
A Prop Synchrophaser
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Which prop is considered the Master prop in the Synchrophasing system
The left prop is the master and controls the right prop (slave)
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What does the phasing portion of the prop sync do
Positions the blades so only one blade crosses the wing root at a time between both engines
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At what temperature do the ENGINE OV TEMP lights illuminate
When ITT exceeds 962C
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If an engine temperature of 1050C what would be read on the gauge
050
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Which engine gauge operates in digital and analog
Engine Temp (ITT)
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