Ground Course

Question 1

What is the aircraft made from?

Answer 1

GFRP

CFRP

Question 2

What type of construction is the fuselage?

Answer 2

• CFRP/GFRP skins bonded to foam core in sandwich construction
• Semi monocoque

Question 3

How many spars in the centre wing box and the main wings?

Answer 3

2 spars in centre wing box, and 2 in main wings (same as DA40)

Question 4

What is the length and wingspan?

Answer 4

Span - 13.5 m

Length - 8.7 m

Question 5

How is the 42 protected from lightning?

Answer 5

• All parts bonded to high capacity Aluminium alloy tubes and strips
• Lightning discharge rod in vertical stabiliser

Question 6

How is the 42 protected form static electricity?

Answer 6

7 static wicks

-Electrochemical paint under white paint to help conduct static electricity

Question 7

What type of ailerons does the 42 have? What features?

Answer 7

• Differential ailerons

- Features an aerodynamic balance to reduce adverse yaw

Question 8

Describe the failsafe design of the inboard and outboard flaps on the 42?

Answer 8

Inboard flap has tongue that fits into groove on outboard flap so if one does not deploy, the other will not

Question 9

What are the flap speeds?

Answer 9

Approach: 137 kts
Landing: 111 kts

Question 10

Describe the variable stop elevator

What happens when there is a throttle split?

Answer 10

• Electrically operated actuator limits up travel to 13˚ when power exceeds 25% or 14” MAP
• When power below 14” full 15.5˚ attainable
• Amber ‘stick limit’ indication when malfunction occurs
• No annunciation when one engine is above and the other is below 25% threshold

Question 11

How is the elevator trim tab actuated?

Answer 11

left: long flexible cable adjustable by pilot
Right: Friction damper to prevent flutter if mechanical failure occurs

Question 12

How is the rudder actuated? is there a mass balance?

Answer 12

Actuated by cables from pilot rudders. yes there is a mass balance

Question 13

How is the rudder trim tab actuated?

Answer 13

By a flexible cable connected to the trim actuator assembly

Two operating rods connect cables to trim tab control horn

Question 14

How is the landing gear powered? is it always pressurised?

Answer 14

Electric pump pressurises hydraulic system. System is always pressurised

Question 15

How is each landing gear pivoted?

Answer 15

Mains: pivoted in centre wing box to fold inwards
Nose: pivoted to retract forwards

Question 16

What components are there on the main gear? Think bogie undercarriage

Answer 16

Tubular steel strut
trailing link
Oleo damper

Question 17

What is the max steering deflection of the nose landing gear?

Answer 17

30˚

Question 18

How does the nose wheel steering work?

Answer 18

• Connected to rudder pedals by steering linkage
• When weight on nose wheel steering can be obtained
• When no weight on nose gear, spring assembly allows the gear to centre so it can retract

Question 19

How many WoW switches are there? Where are they all and what doe they all do?

Answer 19

10 total
Left: Up switch, down switch, WOW switch
Right: Up switch, down switch, Stall warning heat derater
Nose: Up switch, down switch x2, Pressure switch

Question 20

What are the normal and emergency extension speeds for the landing gear? how long might emergency retraction take?

Answer 20

Normal: 194 kts

Emergency extension: 156 kts (up to 20 seconds)

Question 21

What components are there in the hydraulic supply and control system?

Answer 21

• Reservoir
• Accumulator
• Electric pump
• Filter
• Pressure switch

Question 22

Where are the hydraulic supply/ control components located?

Answer 22

• Rear aft cockpit bulkhead
• behind/ below floor
• Left side

Question 23

To what pressures are the pressure regulating valve and pressure relief values set?

Answer 23

regulating valve: 1800psi

relief valve: 2600psi

Question 24

How does the pump pressure switch actuate? At what pressures?

Answer 24

Will turn pump on when pressure gets below 1400psi

Will turn pump off when pressure above 1650psi

Question 25

Describe the differential pressure retraction of the landing gear system?

Answer 25

- Pressure form extend side of actuator is allowed to flow through solenoid valves to retract side ( to begin retraction due to different piston surface areas) - When system detects low system pressure full pressure retraction will begin and retract the gear the remaining distance

Question 26

What will happen to the gear if there is an electrical failure?

Answer 26

it will automatically extend

Question 27

What do the lights of the landline gear indicator actually mean?

Answer 27

Green light: that gear is down and locked Green light out: that gear is not down and locked Red light: one or more landing gear is unsafe ( not fully up or fully down

Question 28

When will a gear warning horn be heard?

Answer 28

- Both throttle levers are in low power (<14"MAP) and gear is selected up - Landing flap is extended with gear retracted

Question 29

Describe the brake system?

Answer 29

Exactly the same as DA40

Question 30

What are the two engine models that the 42 has? ow much horsepower does each produce?

Answer 30

Lycoming left: IO 360-M1A right: LIO 360-M1A Each produces 180HP

Question 31

What is the full throttle time limit? What is the max continuous horsepower on each engine?

Answer 31

5 minutes with all engines As required with one engine out 160Hp max continuous

Question 32

Where is the air intake for the engine, cylinder head cooling, alternator and cabin heat?

Answer 32

Right: Cylinder heat, cabin heat, altenator Lower: Engine air intake Left: Cylinder head

Question 33

What type of oil system is the DA42?

Answer 33

Wet sump

Question 34

What is the max capacity (usable/unusable) of each fuel tank?

Answer 34

Aux tanks: 13.2 USG each usable (0.5 unusable) | Main tanks: 25 USG each usable (1 unusable per tank)

Question 35

How is fuel quantity indicated on the whole fuel system? What about low fuel indications?

Answer 35

- Capacitance type probes in main outboard and inboard tanks (twilight from 16-18usg) - No indicating in Aux tanks - Float type sensor for low fuel cautions/warnings

Question 36

How does the cross-feed work?

Answer 36

When selected on an engine, it will draw fuel from the opposite tank

Question 37

What is the process for using fuel in the Aux tanks? Approximately what rate does the fuel move?

Answer 37

- When mains fuel reaches 15USG turn on transfer pump until mains tank indicates 25USG. - Burn it back down to 15USG and transfer remaining Aux fuel into main tanks - Rate around 1 USG per minute

Question 38

What is the construction of the prop blades? Including coatings and protection

Answer 38

- Compressed wood root - Lightweight wood in main body - Epoxy fibreglass seal - Acrylic lacquer pain - Stainless steel sheath on outer leading edge - Rubber boot on inner leading edge

Question 39

How does the propeller pitch change mechanism work? What happens if high, low, or loss of oil pressure?

Answer 39

- Centrifugal twisting moment twists towards fine pitch - Counter-weights move blades towards coarse pitch - Engine driven governor - Increase oil pressure will move blades towards fine pitch - If oil pressure decreases blades will move to coarse pitch - If oil pressure lost spring will force blades into feathered position

Question 40

Why is than an additional accumulator that is common in training aircraft but not others?

Answer 40

-Allows propeller to be unfeathered

Question 41

What type and capacity battery does the 42 have? Where is it located?

Answer 41

24V 10 Ampere hour lead acid | -Located in right rear side of front baggage compartment

Question 42

What type and capacity alternators does the 42 have?

Answer 42

28V DC 70 Amp hour -Engine driven via a belt

Question 43

Describe the emergency power system? (Same as DA40)

Answer 43

-Lithium battery pack powers floodlight and standby AI

Question 44

What do the voltage regulators do?

Answer 44

control Alternator output | provide over voltage and ground fault protection

Question 45

How does the stall warning system differ from DA40? What happens when the aircraft is on the ground?

Answer 45

- Senses lift - Detector vane and housing are electrically heated by pitot heat switch - Will derate to 50% when on the ground

Question 46

What fire protection things doe the DA42 have?

Answer 46

- Fire extinguisher - same place - Fire resistant pain on inside cowlings - Stainless steel firewalls - Fire sleeving on engine hoses

Question 47

Where is the ELT located? Is it removable? What frequencies?

Answer 47

Rear fuselage below aft baggage compartment It is removable 121.5, 243, 406 MHz (72 hrs on first 2, and 24hrs on 406)

Question 48

How does the power values change for a 15˚C difference from ISA?

Answer 48

+/- 3%

Question 49

What is Vr

Answer 49

78 kts

Question 50

What is initial climb target (all engines)?

Answer 50

100kts

Question 51

What are the parameters for single engine best rate of climb?

Answer 51

- Max power on remaining engine - INOP engine feathered and secured - Flaps Up - Gear up - 90kts IAS - Zero sideslip

Question 52

What are the approved manoeuvres in normal category?

Answer 52

- All normal flight manoeuvres - Stalls (except power on with fuel imbalance - Lazy eights, chandelles, steep turns, 60˚ AoB

Question 53

What are the V speeds for the take-off phase? | Vs0, Vs1, Vmca, Vr, Vy, Vx, Vyse, Vsse (safe single engine), Vcruise climb?

Answer 53

- Vs0 = 57 - Vs1 = 64 - Vmca = 65 - Vr = 78 - Vy = 90 - Vx = 78 - Vyse = 90 min - Vsse = 80 min - Vcruise climb = 90 min (target 110kts)

Question 54

What are ether rest of the V speeds? | Vfinal, Vfe, Vlo (extension), Vlo (retraction), Vle, Vno, Vne?

Answer 54

- Vfinal = 85 min (LDG flap) - Vfe = 137/111 - Vlo = 156 (retraction) - Vlo = 194 (extension) - Vle = 194 - Vno = 155 - Vne = 194

Question 55

What is Va (Manoeuvring speed) for the DA42

Answer 55

120 up to 1542kg | 126 above 1542kg

Question 56

What is max demonstrated crosswind?

Answer 56

17kts

Question 57

What is MTOW, MLW & MZFW

Answer 57

MTOW: 1785kg MLW: 1700kg MZFW: 1650

Question 58

What are the max baggage compartment weights?

Answer 58

Nose: 30kg Fwd rear compartment: 45kg Aft rear compartment: 18kg Rear combined max: 45kg *Note: nose max does not include ballast as they are mounted on the forward wall