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CMEL > Systems > Flashcards

Systems Flashcards

1
Q

The duchess has ___ propellers

A

Counter rotating. (so there is no critical engine)

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2
Q

In a plane with counter-rotating props (CRP), which way do they spin?

A

As viewed from cockpit, left prop spins clockwise and right spins counterclockwise/

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3
Q

Disadvantages of CRP

A

One propeller must have an additional reversing gearbox, or the engines themselves must be adapted to turn in opposite directions. (Meaning that there are essentially two engine designs, one with left-turning and the other with right-turning parts, which complicates manufacture and maintenance.)

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4
Q

In a single vs multi engine aircraft - what happens to your constant speed prop when you lose engine power?

A

Low oil pressure causes:
Single-engine aircraft - prop to low pitch, hi RPM
Multi engine aircraft - prop will feather

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5
Q

Describe the engines in the BE-76 Duchess (9)

A 
4-cylinder 
Lycoming 
horizontally opposed
direct drive (crankshaft connected to prop) 
360 cubic inch
carbureted
180 HP at 2700rpm
piston driven
normally aspirated
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6
Q

What model engines are on the Duchess?

A

Left O-360-A1G6D
Right LO-360-A1G6D
(Opposed, 360 cubic inch)

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7
Q

Describe the props on the Duchess (6)

A 
Hartzell 2-bladed (Macauley actually?)
controllable pitch
constant speed
full feathering 
aluminum alloy
76" normal (74" min fo rrepair)
HC-M2YR-2CEUF/FC7666A (left)
HC-M2YR-2CLEUF/FJC7666A (right)
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8
Q

Describe the landing gear on the Duchess (4)

A

Fully retractable
tricycle gear
Magnesium and Aluminum
hydraulically actuated

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9
Q

What keeps the gear up?

A

Hydraulic pressure of 1250-1550 +/-100

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10
Q

What keeps the gear down?

A

Springs assist in extension and lock the gear in the down position. Springs and hydraulic pressure hold the over-center brace/joints in position until hydraulic pressure is released by reversing the pump.

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11
Q

Where is the hydraulic fluid reservoir? Where is the motor (electric pump)?

A

Both are behind the baggage compartment

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12
Q

What is a squat switch?

A

Some planes have a squat switch which senses if the weight of the aircraft is resting on the gear. The usually fail in an always on (weight on the gear) state; so the gear will fail to retract rather than failing to extend

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13
Q

What prevents accidental gear retraction in the Duchess?

A

pitot tube (airspeed) switch for fault protection
Switch is open on the ground, preventing pump from receiving current
Switch closes at 59-63 KCAS

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14
Q

What extends/retracts the gear? What powers it?

A

electric reversible hydraulic pump.

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15
Q

What can you do during a hydraulic malfunction?

A

Pull gear motor circuit breaker. Open emergency gear extension valve (90deg clockwise) to release hydraulic pressure directly into reservoir and allow gear to free-fall down. Limited to 100 kts due to air-load on nose gear and corrosive hydraulic fluid returning to reservoir will overflow

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16
Q

Describe the brake system

A

hydraulically actuated disc brakes on main gear
wear down to 0.45 in
master cylinder for each set of pedals
reservoir inside nose section on left

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17
Q

Describe the flaps on the duchess

A

Plain flaps (no slots/slats). Electric motor beneath passenger seats. Settings 0-35deg

slots & slats:
https://www.boldmethod.com/learn-to-fly/aircraft-systems/leading-edge-slat-lift-device/

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18
Q

Describe the electrical system in the Duchess

A

28V single-wire, negative ground, DC system with push/pull circuit breakers
converter turns AC from alternator to DC

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19
Q

Describe the stall warning system on the Duchess

A

Two electric stall tabs
Left provides stall warning at 0-16deg flaps
Right provides stall warning at 16-26deg flaps

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20
Q

What’s the time delay relay? What is its purpose?

A

For the landing gear - pump stops after 30 seconds of operation, pilot must recycle gear lever to reset. So if there’s a leak and pump can’t maintain 1250 PSI, it won’t be continuously on.

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21
Q

Is the gear system protected by any circuit breakers?

A

2: gear motor and control

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22
Q

Landing gear retraction moment

A

1177 in/lb

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23
Q

Describe the gear down cycle

A 
Current to pump
Fluid to actuators
Gear extends
Switches turn on lights
Pump off, system depressurized
Over center gear and springs hold gear down
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24
Q

Gear up cycle

A 
Check pitot switch for 59-63kts
Send electricity to pump
Pump sends fluid to actuators
gear retracts
at 1550 PSI, pump shuts off (on below 1250)
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25
Q

When does the gear warning horn go off?

A

throttle too low to maintain flight (12”) or flaps beyond 16

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26
Q

Tire pressure and Strut pressure

What gas is in the tires & strut?

A

all tires 38 PSI
nose gear 250
main gear 300

Nitrogen

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27
Q

Describe the oil system

A

6qt min, 8qt max.
Dipsticks not interchangeable
Oil cooler (thermostatically controlled)
1st 50 hours - MIL-L-6082C then MIL-L-22851

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28
Q

Describe the ice protection in the Duchess

A 
Carb heat (unfiltered air)
Pitot heat
Windshield defrost
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29
Q

Cowl Flaps - max temp

A

CHT (cylinder head temp): max 500deg F

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30
Q

Starters - how long can you leave them engaged? How long do you need to wait afterward?

A

30secs, 2 mins off

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31
Q

How do you prime?

A

Push in the magnetos 10 sec

32
Q

Where is the starter engaged warning light?

A

Between magnetos

33
Q

Placeholder card for powerplant instrument markings on page 3 of BE-76 System and Limitations

A

Oil Temperature
Caution Range (Yellow Arc) – 60O – 120OF
Normal Operating Range (Green Arc) – 120O-245OF
Maximum – (Red Radial) – 245OF
Oil Pressure
Minimum Idle (Red Radial) – 25PSI
Caution Range (Yellow Arc) – 25-60PSI
Normal Operating Range (Green Arc) -60-100PSI
Maximum (Red Radial Line) 100psi
Manifold Pressure
Normal Operating Range (Green Arc) – 15 to 29.6 inHG
Tachometer
Normal Operating Range (Green Arc) – 2000-2700 RPM
Maximum (Red Radial Line) – 2700 RPM
Fuel Pressure
Minimum (Red Radial) – 0.5 psi
Normal Operating Range (Green Arc) – 0.5-8.0 psi
Maximum (Red Radial) – 8.0 psi
Cylinder Head Temperature
Normal Operating Range (Green Arc) – 200 to 500 OF
Maximum (Red Radial) – 500 OF

34
Q

What kind of propellor governor does the duchess have? What does it do?

A

Woodward hydraulic L210650 and R210652

It sends oil pressure to/from the propeller hub

35
Q

What keeps the prop from feathering on the ground in a SINGLE engine aircraft?

A

This is not an issue with single engine aircraft because low oil pressure keeps it at hi RPM mode, takes hi oil pressure to move blades toward higher pitch

36
Q

What sends props to high pitch, low RPM (feather)?

A

Counterweights, Springs + nitrogen (40psi) act against oil pressure, dome pressure

https://youtu.be/Iprf3AOnus0?t=63

37
Q

What sends props to low pitch / high RPM?

A

Oil pressure acts against (compresses) spring

38
Q

What do props do during climb?

A

Underspeed: Flyweights in, pilot valve opens, oil into hub, sets low pitch / hi RPM.

39
Q

What do props do during descent?

A

Overspeed: Flyweights (counterweights) out, pilot valve closes, oil exits hub to reservoir, nitrogen & spring push back, high pitch / low RPM

40
Q

What prevents prop feathering on the ground?

A

A feathering lock. Centrifugal pins (latches) come out to prevent prop from feathering on the ground w no oil pressure and <700-800rpm. They retract when engine starts. when you shut engine down, prop will be at low pitch because below governed RPM and pins return to lock position and hold blades before spring can feather the blades

41
Q

How do props feather?

A

Pilot valve opens, cuts off oil supply, letting oil drain out of propeller hub. Spring, counterweights, nitrogen, and aerodynamic load pushes blades to high pitch. Feathering latches engage

42
Q

What are the pitch settings at 30” station?

A

Low 12.1 +/- 1
High 17-20
Feather 81 +/- 1

43
Q

PN for Hartzell spinner assembly

A

C2285-3P and C2285-3PL

44
Q

How does the throttle work on the duchess? Which gauge shows your throttle setting?

A

Same - you’re just opening/closing throttle valve. Your throttle setting is shown on the manifold pressure gauge

45
Q

How do you change the RPM setting?

A

You choose an RPM setting with the prop control. The prop governor maintains that setting by sending oil pressure to/from the propeller hub to move the blades

46
Q

Pros and cons of constant speed props

A

Pros: less wear, more efficient, increased performance
Cons: maintenance, cost, complexity

47
Q

What MP/RPM settings should you avoid?

A

Hi MP and low RPM

48
Q

Describe the fuel system on the duchess (tanks, sumps, fuel types)

A

2 50gal tanks with 103 total capacity. 1.5 unusable per tank
100LL (blue) and 100 (green) only
8 sumps total

49
Q

Describe the fuel pumps on the duchess

A

2 engine driven, 2 auxiliary, 1 combustion heater

50
Q

Describe the fuel crossfeed system and when/how to use it

A

Level flight, emergency conditions only
System cannot transfer fuel from one wing to another, instead each engine can draw from opposite side
operative engine aux pump ON
inop fuel selector OFF
operative fuel selector CROSSFEED
operative fuel selector ON/OFF as required

51
Q

Describe the fuel selector valve

A

Each engine has one. Each valve also has a strainer and drain.
Positions: ON, CROSSFEED, OFF
3 hoses connect at the valve: In from tank & crossfeed (opposite tank), out to engine

52
Q

Priming goes to which cylinders?

A

1,2,4

53
Q

What’s your approximate fuel flow in the duchess?

A

23” 2300 RPM - 9 GPH

25” 2500 RPM - 11 GPH

54
Q

Maximum slip duration

A

30 seconds

55
Q

Minimum fuel level for takeoff

A

9 gal (yellow arc) per tank

56
Q

Describe the electrical buses. Which are high load items for the battery?

A

Battery, Bus1, Bus2

High Load Items: Gear, flaps, landing lights, transponder, Nav-Coms

57
Q

What voltage protection does the duchess have? (5)

A

Over-voltage protection – over-voltage relay & warning light, voltage regulator
Undervoltage/Alternator out – warning light
Emergency Precautions – Isolation breakers, temp controlled bus tie (ME 103 and After)
Starter-Engaged Warning Light (3733D only)

58
Q

Describe the battery

A

Each side has two 12V batteries in a series or one 24V 55A battery (vented)

59
Q

Describe the alternators

A

Two 28V 55A engine-driven alternators (belt-driven)
Alternators produce more voltage to compensate for loss in system.
Alternators are self-exciting at 1200-1400 RPM/50% load

60
Q

Describe the heater, risks, protection and fuel burn.

A

45,000 btu Janitrol Combustion heater: Little furnace in the nose that is burning gas.
Same CO risk as carb heat.
Protected w overheat sensors that blows circuit breaker in nosewheel/nose baggage compartment at 300deg F. Must be reset by mechanic.
Burns 2/3 gal/hour from right tank

61
Q

Operation for combustion heater

A

Ground: Blower on first, then heater on (blower stops with gear retract)
In-flight: Must have fresh air inlet set at least 1/2 open, monitor temp by heater pull knob
Shutdown: have blower on for 2 minutes

62
Q

What moves the elevators, rudder, aileron, trim and flaps?

A

Elevators - cables and pulleys
Rudder - cables and pulleys, push/pull rods (steering)
Aileron - cables and pulleys, push/pull rods
Trim - cables & bungees
Flaps - electric motor under copilot’s seat

63
Q

Placeholder card for control surface movements from TCDS (BE-76 System and Limitations page 7)

A 
wing flaps down 35 +/- 1
aileron up 20 down 15
rudder right/left 30
elevator up 20 down 15
rudder tab right/left 20
elevator tab (w elevator neutral) up 4 down 20
64
Q

Trim tab types

A

Trim tab deflects to relieve pressure
Balance tab – connected to yoke. The yoke moves it to move the elevator
Antiservo – yoke moves it to move the stabilator
Antiservo tabs – leads in the direction of the control surface
Moves more quickly than the manual control surface

https://www.boldmethod.com/learn-to-fly/systems/4-types-of-trim-tabs/

65
Q

What static sources does the Duchess have?

A

One static port on each side of the aft fuselage

Alternate Static source on pilot side cabin wall, above landing gear extension tool.

66
Q

Describe the vacuum system

A

One pressure pump on each engine interconnected to form a single system
Powers Attitude Indicator and Heading Indicator
Check Valve allows for continued operation with one pump inoperative
Normal Operating Range (Green Arc) – 4.3 – 5.9 inHg
2 red buttons for failure indication

67
Q

What are the Service Ceiling altitudes for the duchess?

A

Twin Engine: 19,600 @ 3900lbs
Single-Engine: 6,200 @ 3900lbs
Single-Engine: 10,300 @ 3400lbs

68
Q 
Maximum Ramp Weight
Maximum Takeoff Weight
Maximum Landing Weight
Maximum Zero Fuel Weight
Useful load
Standard Empty Weight
Baggage Compartment
A 
Maximum Ramp Weight: 3916 lbs.
Maximum Takeoff Weight: 3900 lbs.
Maximum Landing Weight: 3900 lbs.
Maximum Zero Fuel Weight: 3500 lbs. (plane, people, baggage, and no fuel)
Useful load 1470
Standard Empty Weight: 2446 lbs.
Baggage Compartment: 200 lbs.
69
Q

Flight Load Factor Limits

A

Flaps up: +3.8g / -1.52 Gs

Flaps down: +2.0 Gs

70
Q

What MP reading should you expect to see at full throttle on takeoff?

A

About 1” below ambient (whatever you were reading before you started the engine). If it’s less, abort takeoff.

71
Q

What does the MP read if the engine is inoperative and feathered?

A

Ambient or up to an inch less due to restrictions in induction system

72
Q

Does MP indicate power?

A

No. It indicates how much fuel/air mixture is available to the engine and how much suction is being produced. At a given MP, increasing RPM will lower MP and vice versa?

73
Q

Max Demonstrated Crosswind

A

25kts

74
Q

Placeholder for questions to ask CFI:
Can a single alternators charge the batteries?
How can you tell if one of the 2 vacuum pumps has failed?

A

???

75
Q

Where is the manifold pressure reading taken?

A

In the intake manifold, after the throttle and then venturi, but before the intake valve to the cylinder.

76
Q

How does an unfeathering accumulator work?

A

High oil pressure from the governor charges the accumulator just moments after engine rotation begins. This gives you a single shot to unfeather.

CMEL (5 decks)

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