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DA42 > Ground Course > Flashcards

Ground Course Flashcards

1
Q

What is the aircraft made from?

A

GFRP

CFRP

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2
Q

What type of construction is the fuselage?

A
  • CFRP/GFRP skins bonded to foam core in sandwich construction
  • Semi monocoque
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3
Q

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

A

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

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4
Q

What is the length and wingspan?

A

Span - 13.5 m

Length - 8.7 m

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5
Q

How is the 42 protected from lightning?

A
  • All parts bonded to high capacity Aluminium alloy tubes and strips
  • Lightning discharge rod in vertical stabiliser
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6
Q

How is the 42 protected form static electricity?

A

7 static wicks

-Electrochemical paint under white paint to help conduct static electricity

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7
Q

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

A
  • Differential ailerons

- Features an aerodynamic balance to reduce adverse yaw

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8
Q

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

A

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

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9
Q

What are the flap speeds?

A

Approach: 137 kts
Landing: 111 kts

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10
Q

Describe the variable stop elevator

What happens when there is a throttle split?

A
  • 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
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11
Q

How is the elevator trim tab actuated?

A

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

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12
Q

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

A

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

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13
Q

How is the rudder trim tab actuated?

A

By a flexible cable connected to the trim actuator assembly

Two operating rods connect cables to trim tab control horn

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14
Q

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

A

Electric pump pressurises hydraulic system. System is always pressurised

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15
Q

How is each landing gear pivoted?

A

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

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16
Q

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

A

Tubular steel strut
trailing link
Oleo damper

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17
Q

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

A

30˚

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18
Q

How does the nose wheel steering work?

A
  • 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
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19
Q

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

A

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

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20
Q

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

A

Normal: 194 kts

Emergency extension: 156 kts (up to 20 seconds)

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21
Q

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

A
  • Reservoir
  • Accumulator
  • Electric pump
  • Filter
  • Pressure switch
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22
Q

Where are the hydraulic supply/ control components located?

A
  • Rear aft cockpit bulkhead
  • behind/ below floor
  • Left side
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23
Q

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

A

regulating valve: 1800psi

relief valve: 2600psi

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24
Q

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

A

Will turn pump on when pressure gets below 1400psi

Will turn pump off when pressure above 1650psi

25
Q

Describe the differential pressure retraction of the landing gear system?

A
  • 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
26
Q

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

A

it will automatically extend

27
Q

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

A

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

28
Q

When will a gear warning horn be heard?

A
  • Both throttle levers are in low power (<14”MAP) and gear is selected up
  • Landing flap is extended with gear retracted
29
Q

Describe the brake system?

A

Exactly the same as DA40

30
Q

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

A

Lycoming

left: IO 360-M1A
right: LIO 360-M1A

Each produces 180HP

31
Q

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

A

5 minutes with all engines
As required with one engine out

160Hp max continuous

32
Q

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

A

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

33
Q

What type of oil system is the DA42?

A

Wet sump

34
Q

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

A

Aux tanks: 13.2 USG each usable (0.5 unusable)

Main tanks: 25 USG each usable (1 unusable per tank)

35
Q

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

A
  • 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
36
Q

How does the cross-feed work?

A

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

37
Q

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

A
  • 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
38
Q

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

A
  • 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
39
Q

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

A
  • 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
40
Q

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

A

-Allows propeller to be unfeathered

41
Q

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

A

24V 10 Ampere hour lead acid

-Located in right rear side of front baggage compartment

42
Q

What type and capacity alternators does the 42 have?

A

28V DC
70 Amp hour

-Engine driven via a belt

43
Q

Describe the emergency power system? (Same as DA40)

A

-Lithium battery pack powers floodlight and standby AI

44
Q

What do the voltage regulators do?

A

control Alternator output

provide over voltage and ground fault protection

45
Q

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

A
  • Senses lift
  • Detector vane and housing are electrically heated by pitot heat switch
  • Will derate to 50% when on the ground
46
Q

What fire protection things doe the DA42 have?

A
  • Fire extinguisher - same place
  • Fire resistant pain on inside cowlings
  • Stainless steel firewalls
  • Fire sleeving on engine hoses
47
Q

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

A

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

48
Q

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

A

+/- 3%

49
Q

What is Vr

A

78 kts

50
Q

What is initial climb target (all engines)?

A

100kts

51
Q

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

A
  • Max power on remaining engine
  • INOP engine feathered and secured
  • Flaps Up
  • Gear up
  • 90kts IAS
  • Zero sideslip
52
Q

What are the approved manoeuvres in normal category?

A
  • All normal flight manoeuvres
  • Stalls (except power on with fuel imbalance
  • Lazy eights, chandelles, steep turns, 60˚ AoB
53
Q

What are the V speeds for the take-off phase?

Vs0, Vs1, Vmca, Vr, Vy, Vx, Vyse, Vsse (safe single engine), Vcruise climb?

A
  • Vs0 = 57
  • Vs1 = 64
  • Vmca = 65
  • Vr = 78
  • Vy = 90
  • Vx = 78
  • Vyse = 90 min
  • Vsse = 80 min
  • Vcruise climb = 90 min (target 110kts)
54
Q

What are ether rest of the V speeds?

Vfinal, Vfe, Vlo (extension), Vlo (retraction), Vle, Vno, Vne?

A
  • Vfinal = 85 min (LDG flap)
  • Vfe = 137/111
  • Vlo = 156 (retraction)
  • Vlo = 194 (extension)
  • Vle = 194
  • Vno = 155
  • Vne = 194
55
Q

What is Va (Manoeuvring speed) for the DA42

A

120 up to 1542kg

126 above 1542kg

56
Q

What is max demonstrated crosswind?

A

17kts

57
Q

What is MTOW, MLW & MZFW

A

MTOW: 1785kg
MLW: 1700kg
MZFW: 1650

58
Q

What are the max baggage compartment weights?

A

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

DA42 (3 decks)

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