DA42 Systems Videos Flashcards
What type of Electrical System Does the DA42 have
28 Volt Electrical System
How many Primary Electrical Sources does the DA42 have and what are they
- 2 Primary Systems
- The Alternators
- The Battery
How many Alternators does the DA42 have
2 Engine Driven Alternators. One for each engine
If both Alternators fail how is the plane powered
It has an onboard battery
If the Alternators are working is the battery used
Yes, it can be used in different phases of flight where additional battery is needed.
If you experience a total electrical failure do you have any options
The Emergency Horizon Switch
What does the Emergency Horizon Switch do
It powers Flood Lights and the Standby Attitude Indicator to work for 90 minutes
Are there any electrical backups for the ECUs in the event of a total electrical failure
Yes there are two sealed lead acid batteries the run only the ECUs for 30 minutes
What propeller system does the DA42 have
2 Three Bladed MT Constant-Speed Feathering Propellers
What is another name for “Constant-Speed” propellers
Variable- Pitch Propellers
How is the Pitch-Angel of the Propellers Controlled
The Propeller Governor
The Propeller Pitch-Control System is integrated into the
Electronic Engine-Control System
The engine RPM is chosen by the throttle and this adjusts the propellers to maintain a constant speed
The Propeller Governor
ECU stands for
Engine Control Unit
The ECU controls the
The Electronic Engine-Control System & the Propeller Pitch-Control System
Each Propeller is geared down by a ratio of
1.69:1
Does the Engine or Propeller turn at a higher rate
The Engine turns at a higher rate
Depending on whatever power setting the pilot inputs this will adjust the Propeller RPM accordingly
The ECU
The Constant-Speed Propellers on the DA42 are 3 Things
- Full Feathering
- Counterweighted
- Oil Pressure to-Decrease-Pitch Designs
If the Propeller Governor increases Oil Pressure what happens to the Propeller
It drives the blade angel toward Low Pitch, High RPM, and Away from Feathering (Low Pitch is more Vertical Blades)
What is the only thing that keeps the DA42 Propeller Bladed from Feathering
A constant supply of High-Pressure Engine Oil
When a Blade is Feathered is it Vertical or Horizontal
Horizontal or Flat
If the event of a loss of Oil Pressure what happens to the Propellers
They will Feather
What would happen in the event of a failure of the Propeller Governor
The Propellers would Feather because of a loss of oil pressure
What is used to prevent the opposing aerodynamic forces and a Windmiling Propeller and toward course pitch
Counterweights attached to the shank of each propeller blade
Where is the oil in the Propeller Governor coming from
The Engine Gearbox
The Propeller Governor Drives the
Propellor Hub
The Propellor Hub drives a
Piston connected to the Propeller Blades
In the event of an Engine Failure can the DA42 Propellers Feather
Yes
Why is Feathering good in the event of Engine Failure
It reduces drag, minimizes the windmilling effect, and improves single engine performance
How do you Feather an Engine in the DA42
Power for that Engine must be brought to Idle & The Master Switch for that Engine must be turned off
What happens when Power for Engine is Cut & The Engine Master Switch is Turned Off
Oil Pressure is Dumbed from the Propeller Governor and the Counter Weights Drive the Propellers toward the Feathered Position
The Landing Gears System in the DA42 is this Configuration
Retractable Tricycle Gear Configuration
The Main Landing Gear Consists of
Two Main Gear Assemblies each with a Strut & a Trailing Link connected to the wheel
The Nose Landing Gear has a
Strut and a Nose Centering Mechanism
If your Gear Extension System fails what do you do
Use the Emergency Gear Extension System
What are the 4 Forces Acting on an Airplane
- Thrust
- Drag
- Lift
- Weight
How is Thrust Different between a Single & Multi-Engine Aircraft
Single - Thrust runs down the Centerline
Multi - Thrust is Higher and Acts on the Sides of the Aircraft
How is Lift Different between a Single & Multi-Engine Aircraft
Single - Lift is Generated from the Nose
Multi - Life is Generated from the Wings creating induced airflow over the wings increasing lift
How is Thrust Different between a Single & Multi-Engine Aircraft
Multi has more from increased thrust
How is Weight Different between a Single & Multi-Engine Aircraft
Multi is typically heavier
If there is an Engine Failure the aircraft with Yaw towards
The Dead Engine
If there is an Engine Failure the aircraft with Roll towards
The Dead Engine
The Yawing and Rolling of a Dead Engine is caused by
Asymmetric Thrust
The More Asymmetric Thrust or More Power coming from One Engine the
More Yaw and Roll
The concept that the Descending Blade produces more Thrust than the Ascending Blade because the Descending Blade has a Higher Angel of Attack when in a High Pitch Attitude
P-Factor
The longer the ARM of Thrust the more
Yaw that will be created
