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Multi Engine - DA42 > Systems - DA42 NG > Flashcards

Systems - DA42 NG Flashcards

1
Q

Give a brief overview of the Landing Gear System

A

Acronym: THERN

T - Tricycle
H - Hydraulically actuated
E - Electronicaly powered (power pack)
R - Retractable
N - Nose gear stearing

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2
Q

What is the Power Pack, what are its main components, & where is it located?

A

Acronym: REEP

1) Provides the power & hydraulic fluid for the landing gear

2)
R - Resevoir (hydraulic)
E - Electric Motor
E - Emergency Accumulator (emergency gear down)
P - Pumps for Hydraulic fluid

3) Located behind the R rear pax seat

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3
Q

What are the 10 components of the Landing Gear?

A

Acronym: DUST FT PSHD

D - Down Lock Hook (DLH)
U - Unlocking Rod
S - Strut
T - Tension Spring
F - Folding Stay
T - Trailing Link
P - Position Limit Switches
S - Squat Switches
H - Hydraulic Actuator
D - Dampner

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4
Q

Describe the basic overveiw of the Prop System

A
  1. The master switch turns on the Unfeathering accumulator & the Feathering valve. (SEE DIAGRAM)
  2. Main Components
    * Master switch
    * Solenoid valve
    * Unfeathering accumulator
    * GB
    * Feathering Valve
    * Prop Gob
    * Hub
    * Counterweight Latching system
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5
Q

Describe the Automatic Feathering System

A

Automatic Feathering occurs when
1. Engine Master is turned off ABOVE 1,300 RPM
2. Complete loss of oil pressure

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6
Q

What is the Centrifugal Latching Mechanism?

A

Weights attached to the Propeller that are..
1. Latched below 1,300 RPM to prevent unwanted feathering on the ground
2. Unlatched above 1,300 RPM to allow the prop to be feathered

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7
Q

Why dont we want the prop to be feathered on the ground below 1,300 RPM?

A
  1. A feathered (high/coarse pitch) prop will put more stress on the engine
  2. The prop will produce more thrust at a lower RPM in the unfeathered (low/fine pitch) position, which is good for taxiing.
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8
Q

What is meant by a Fully Feathered or Unfeathered Prop?

A

Fethering refers to the change in pitch of the propeller blade
Fully Feathered = High pitch, Coarse Pitch (low RPM)
Unfeathered = Low pitch, Fine Pitch (high RPM)

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9
Q

Describe how oil pressure effects the pitch & RPM of the prop in a Twin

A
  1. High Oil Pressure = Low Pitch = High RPM
  2. Low Oil Pressure = High Pitch = Low RPM

This is the reverse of the DA40 NG.

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10
Q

Describe what the Unfeathering Accumulator does

A
  1. Stores Compressed Nitrogen Oil (125 PSI) in order to forcibly UNFEATHER the prop to RESTART a failed engine
  2. Helps to maintain Oil Pressure for 5-10 seconds if lost intermittently
  3. The Unfeathering Accumulator is engaged when the Engine Master Switch is turned on

Essentially, the Accumulator provides Hydraulic pressure when the engine is restarted or during a temporary loss of oil pressure

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11
Q

Why does the oil pressure in the prop governor of a twin work the opposite of a single engine aircraft?

A

Because if our engine fails in the twin, we want our propeller to fail in the HIGH pitch position (coarse, low RPM) in order to minimize drag

  • In the single engine, we want our engine to fail in the low pitch position (fine, high RPM) in order to maximize thrust.
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12
Q

What provides the oil pressure necessary to operate teh Prop Governor?

A

The Gearbox Oil Pump

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13
Q

What is the Low Pitch Limit (Unfeathered)?

A

13 degrees

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14
Q

What is the High Pitch Limit of the Prop (Fully Feathered)

A

80 degrees

  • Close to 90, to minimize drag
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15
Q

What does the Left Gear Squat Switch do?

A

A sensor that..
1. Prevents gear retraction on the ground

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16
Q

What does the Right Gear Squat Switch do?

A

Acronym: G-TEST

A sensor that..

G - Glow Plugs, prevents them from being activated in the air
T - Traffic Avoidance System, turns it off on the ground
E - ECU test, prevents it from occuring in the air
S - Stall Heat, prevents it from being turned on too long on the ground (will damage it)
T - Tach time, tracks it (air time)

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17
Q

How does a Squat Switch work?

A

They are essentially electrical weight sensing devices
* When weight is applied to the Landing Gear an electrical circuit is completed

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18
Q

Where are the Squat Switches located?

A

On the L & R main gear
* Little black things
(see photo)

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19
Q

Auxiliary fuel tank capacities

A

13.7 Max (x2: 27.4)
13.2 Usable (x2: 26.4)

We don’t use our auxillary tanks on training flights

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20
Q

Main Tank Capacities

A

26 max (x2: 52)
25 Usable (x2: 50)

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21
Q

What is the total fuel capacity per side?

A

39.7 Max
38.2 Usable

*including Aux tank

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22
Q

What is the total fuel capacity?

A

79.4 Max
76.4 Usable

*including Aux tanks

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23
Q

What is the max fuel imbalance (between the mains) when NOT using the AUX tanks?

A

5 Gal

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24
Q

What is the max imbalance when USING the Aux Tank?

A

1 Gallon

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25
Q

What are the engine restart limitations?

A

Above 10,000ft MSL
* IMMEDIATE Restart

Below 10,000ft MSL
* Above -5c = 10 mins
* -5c to -15c = 5 mins
* Below -15c = 2 mins

26
Q

Which engine powers the Defrost?

A

Left Engine

27
Q

Which engine powers the Cabin Heat?

A

Right Engine

28
Q

What are the Operating Maneuvering Speeds? (Vo)

A

Up to 3,748 lbs = 112 kts
3,748 lbs to 3,968 lbs = 119
Above 3,968 = 122

29
Q

Max T/O Weight

A

4,407 lbs

30
Q

Max Zero Fuel Weight

A

4,045 lbs

31
Q

Max Landing Weight

A

4,407 lbs

32
Q

Minimum Flight Weight

A

3,197 lbs

33
Q

Wingspan

A

44.5 ft

34
Q

Where is the ELT Antenna located?

A

First antenna on top of the fuselage

35
Q

Where are the Landing and Taxi lights located?

A

Under the fuselage

36
Q

On the bottom of the fuselage, what is the small tube with the angular cut, next to the OAT sensor?

A

Its a battery vent

37
Q

How do you know which planes will have the Short Baggage extension vs the standard?

A

The planes with the Short Baggage Extension will be the planes with A/C.

38
Q

Weight limits for the planes with the Short Baggage Compartment

A

Standard Baggage Area (Arm: 143.7)
* 66 lbs (includes the Tray)

Short Baggage Ext (Arm: 156.3)
* 33 lbs

Planes with A/C are configured this way

39
Q

What are the weight limits for the planes with the Cabin Baggage Compartment?

A

Cabin Baggage (Arm: 153.1)
* 100 lbs (inlcudes the Tray)

Baggage Ext (Arm: 178.7)
* 40 lbs

Total not to exceed 100 lbs

Planes without A/C are configured this way

40
Q

How is what is Engine Load?

A

A calculation from the ECU based on..
* Fuel Pressure
* Fuel Injection timing
* Manifold Pressure
* Prop RPM

41
Q

What is the maximum steering angle using only the nose wheel?

A

30 degrees

You will use breaking and thrust to turn more

42
Q
A

nose wheel centering mechanism

43
Q

Describe the Flaps on the DA42

A

Two main sections
* Inboard
* Outboard

Type
* Inboard are Split Flaps
* Outboard are Plain Flaps

Operation
* Electrically actuated, mechanically interconnected

44
Q

What is the up limit of the Variable Elevator Stop and why?

A

13 degrees (when both engines above 20% power.

Reason: Full elevator deflection durring a stall, the stall charactoristics of the aircraft are degraded

If this function is not working you will see a ‘STOP LIMIT’ Caution on the G1000

45
Q

How do you check the Variable Elevator Stop during preflight?

A
  1. Hold the stick all the way aft
  2. Throttle full
  3. Check stop limit engagment
  4. Throttle Idle
  5. Check for stop limit disengagement
46
Q

Describe how the prop will unfeather

A
  1. The Unfeathering Accumulator will unfeather the prop when the engine master is turned on
  2. Oil pressure will begin building when the starter is cranked
47
Q

What are the approved engine shut down demonstration altitudes?

A

Between 3,000ft AGL & 10,000ft PA

48
Q

Are we allowed to demonstrate a windmill restart?

A

No, per the AFM. We can only restart the engine with the starter

A windmill restart is when you start the engine using the windmilling propeller to create enough motion to engage the engine mechanisms vs using the starter moter to turn the prop/engine

49
Q

Max restart altitude:

A

IMMEDIATE restarts only between 10,000ft & 15,000ft PA

50
Q

What is the speed limit for a Starter assisted engine restart?

A

Max 100kts

51
Q

What are the Engine Starter Motor use limitations when restarting an engine in flight?

A
  1. Max time: 5 seconds
  2. Requires a 30 second cooldown
  3. Max Attemps: 3
52
Q

Describe what each of the air inlets on the engine are for

A

Vew: Facing the nose cone
1.RH opening: Engine air, Intercooler air
2.Underside opening, Gearbox cooling, Radiator cooling, Fuel cooling, & Cabin Heat exchanger
3. Rear opening: air escape for all engine inlets

53
Q

What is the temperature at which the Thermostatic Valve will open the Radiator circuit?

A

88c

54
Q

Which engines operate the Cabin Defrost and Cabin Heat respectively?

A

LH Engine
* Cabin Defrost

RH Engine
* Cabin Heat

55
Q

Describe the Fuel System

A
56
Q

When the Fuel Valve is set to Crossfeed, what happens to the Return Fuel, which tank does it Return to?

A

The fuel will return to the tank it came from.
So the opposite engine will be feeding entirely off of the opposite side main tank completely independent of its own main tank.

57
Q

Where does the RACC gets its power from?

A

A 3rd alternator located on the left engine

58
Q
A
59
Q

What is the RACC?

A

Recirculating Air Cabin Cooling

60
Q

Explain the Limitations and Performance Impacts of the RACC

A

Limitations (no use)
* Above 10,000ft PA
* Below 10c
* Durring Emergencies or Abnormal Operations
* T/O, LDG, & Go-Arounds

Performance Impacts
* Adds 150lbs
* ON: -75 FPM climb, -5% TAS
* OFF: -2% TAS

Multi Engine - DA42 (10 decks)

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