DA42 Systems Flashcards
What’s the performance group for the DA42
Group B
Is the Track Diamond visible if there is no cross-track?
No
How to obtain drift from the MFD and HSI?
Drift = Track (MFD) - Heading (HSI)
Power-plant Characteristics
x2 Autro E4-C Engines (Mercedes A Class Diesel Engines rebranded as Austro)
The modification includes 2 ECU for redundancy, different turbochargers, …
x4 cylinders (liquid cooled)
Common rail injection
Dual Digital Engines Control
Turbocharger Max. Power
2300 RPM, 100% for 5 minutes
Max. Continuous Power
92%, 2300 RPM
Does the DA42 have a carburettor?
No, the engines are fuel injected. The injectors replace the carburettor, mitigating the risk of ice on the carburettor.
What is the benefit of having a turbocharged engine?
To maintain a constant power output to a high altitude.
According to SOPs, when should you select alternate air?
Routinely in visible moisture and anytime there is a risk of icing.
Why are there fully feathering propellers and when are the engines automatically feathered?
To decrease drag of a windmilling propeller. Automatically feathered when engines are shutdown in flight.
What can harsh throttle handling lead to?
ECU failure
What is the airframe made of?
Composite materials (carbon fibre, epoxy resin, incl. a fully monocoque fuselage)
All DAs are white in order to keep skin temperature below glass transition temperate of the epoxy resin.
Explain the landing gear design
The landing gear is a trailing link arrangement, where suspension and support features are separated to increase shock absorption.
Hydraulically operated by electrically powered hydraulic pumps.
Equipped with a squat switch to prevent retraction on ground.
Gear Extension Speed = Vne = 188 kts, which means that is can be used as an airbrake for hot descents anytime.
Explain the braking system.
Hydraulically operated disc brakes.
Explain the de-icing system.
The fluid system weeps out anti-icing fluid through pores on the leading edges of aerofoil surfaces and delivers fluid to props and windscreens.
2 independent systems, one delivers to the airframe + props, and the other delivers to the windshields. Each has 2 pumps so 4 pumps in total.
Normally powered by the LH main bus.
30L useable, 22L min. for dispatch.
Explain the modes of the de-icing system.
- NORM
For frequent and less severe icing conditions, prior to ice formation.
Used in Climb + Cruise
2 pumps simultaneously, cycled 30s ON 90s OFF
Operating Time: 2.5h - HIGH
For all known icing conditions, when ice has already accumulated.
Used in Climb + Cruise + Approach
1 pump simultaneously
Operating Time: 1.0h - MAX
Maximum protection for conditions outside of the icing envelope.
2 pumps simultaneously ON for 2 minutes.
Operating Time: 0.5h
Maximum XWIND for approaches
Normal (Full Flaps): 20 kts
Flapless / APP flaps: 25 kts
What type of ailerons are used?
Horn type ailerons to reduce adverse yaw.
What system reduces adverse yaw?
Yaw damper for autopilot operations.
What is the glass cockpit primarily made of?
PFD + MFD
MFD characteristics - VHF Comms Radio
118.0 MHz to 136.975 MHz with 25 KHz or 8.33 KHz spacing with 10 W or 16 W output.
MFD characteristics - VOR Receiver Range
108.0 MHz to 117.975 MHz
What does the G1000 equipment include?
S B D F G R
S - Standard Com/Nav (VHF RTF, VOR, ILS)
B - LPV (APV with SBAS)
D - DME
F - ADF
G - GNSS (+ PBN capabilities in item 18)
R - PBN Approved
How many batteries and alternators are in the electrical system? Explain the importance of the batteries.
4 batteries and 3 alternators.
The engines (common rail diesel engines) need constant electric power to power the ECU and the injection system. Total loss of electrical power will lead to the engines stopping when batteries are exhausted.
