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Systems 1 (22-07) > "Advanced" Extra Flashcards > Flashcards

"Advanced" Extra Flashcards

1
Q

What are the details of the T-6A engine?

A

It is a Pratt & Whitney PT6A-68 free turbine, reverse flow, 4 blade, variable pitch, constant speed propeller turboprop.

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2
Q

What aircraft systems does the accessory compartment contain?

A

Accessory Gearbox
Oil Tank
Starter/Generator
Battery

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3
Q

What are the components of the gas generation section?

A

Compressor Inlet
Compressors
Combustion Chamber
Compressor Turbine

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4
Q

How many compressors does the engine have?

A

4 axial compressors and 1 centrifugal compressor

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5
Q

What are the components of the power turbine section?

A

Power Turbines
Exhaust Case
Reduction Gearbox
Propeller Shaft

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6
Q

What are the exhaust system components?

A

Exhaust Ports

Exhaust Stacks

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7
Q

What supply the three necessary items for engine operation?

A

Heat - Ignition System
Fuel - FMU
Air - Starter

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8
Q

What are the components of the ignition system?

A

Ignition Exciter
2 High Voltage Igniter Cables
2 Spark Igniters

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9
Q

Where are the spark igniters located on the aircraft?

A

At the 4 and 9 o’clock positions around the combustion chamber.

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10
Q

How does the starter system create a spark?

A

The ignition exciter receives a low voltage input that is transformed by the exciter to a high voltage signal. This is sent to each spark igniter to ignite the fuel.

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11
Q

What are the positions for the ignition switch?

A

ON, NORM

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12
Q

What annunciator light comes on when the igniters are active?

A

IGN SEL

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13
Q

What does pushing the PCL actually do?

A

It releases a nominal amount of fuel and sends a signal to the FMU to determine how much fuel should be released to the engine.

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14
Q

When might an amber PMU STATUS annunciator light come on?

A

Either the PMU needs maintenance, or there is a mismatch between the weight-on-wheels switches which leads to the PMU not reverting to ground mode after landing.

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15
Q

Whenever the PMU FAIL annunciator is on, the ________ is also on.

A

PMU STATUS

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16
Q

What is the primary power source for the PMU?

A

The permanent magnet alternator (PMA). 32 VAC

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17
Q

Where is the PMA located?

A

Mounted on the reduction gearbox.

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18
Q

Where is the starter/generator?

A

Attached to the accessory gearbox.

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19
Q

Where does the oil system supply oil?

A

Reduction Gears
Accessory Drives
Propeller
Engine Bearings

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20
Q

What are the component systems of the oil system?

A

Pressure System
Scavenge System
Cooling System

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21
Q

How does the oil system pressurize for use in inverted flight?

A

Through a pressure pump and inverted oil pickups.

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22
Q

When is the oil cooled?

A

Before it re-enters the oil tank.

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23
Q

Where is the main oil filter? Where are other oil strainers?

A

In the oil tank. In the power, compressor, and accessory drive areas.

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24
Q

Where is the chip detector sensor?

A

In the reduction gearbox.

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25
Q

What happens if there is debris detected in the oil?

A

CHIP annunciator light

MASTER WARN and aural tone

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26
Q

When should you check the oil levels?

A

15-20 minutes after shutdown. No more than 30 minutes after shutdown.

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27
Q

How should you service the oil?

A

Use the dipstick to check the levels. If the oil level is at or below ADD, fill until at MAX HOT.

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28
Q

What alerts the CWS to illuminate if oil temperature and pressure are out of limits?

A

A signal conditioning unit (SCU) computer.

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29
Q

If oil pressure is 15 psi or below at IDLE power, or 40 psi or below above IDLE, the _________ OIL PX light will be on.

A

Red

30
Q

An _________ OIL PX light illuminates when teh oil pressure is between 15 and 40 at IDLE power, or between 40 and 90 psi for 10 seconds above IDLE power.

A

Amber

31
Q

100% torque is available from approximately ______ ft MSL to ________ to _________ ft MSL.

A

0-12,000-16,000

32
Q

How does the PMU direct the PIU to maintain propeller RPM at 100%?

A

By using an electronic governor.

33
Q

What are the limits of the backup mechanical overspeed governor?

A

Torque will not exceed 106%

34
Q

If the PMU or PIU fails, how is propeller RPM regulated?

A

By a backup system that resets the mechanical flyweight overspeed governor to maintain torque at 100+-2%.

35
Q

What are the three pitch conditions?

A 
Feathered - 86 deg from perpendicular, least drag, no thrust
High Pitch (coarse) - most flight conditions
Low Pitch (flat or fine) - 15 deg from perpendicular, most drag, some thrust
36
Q

What naturally pulls the prop towards feathers?

A

Feathering Spring

Counterweights

37
Q

As the PIU increases oil pressure, the sliding piston is forced __________, rotating the propeller blades toward __________ pitch.

A

forward, low

38
Q

How do you manually feather the propeller if residual oil pressure remains?

A

Place the PCL off – the feather dump solenoid valve is activated, and the oil pressure is released.

39
Q

Where does the feather dump solenoid valve receive power from?

A

The circuit breaker labeled PROP SYS on the battery bus circuit breaker panel.

40
Q

What conditions affect propeller pitch?

A

PCL input
Temperature
Altitude

41
Q

What does the EDM do?

A

It monitors and processes engine operation data.

42
Q

Where is torque measured?

A

In the reduction gearbox on the phase shift torque probe.

43
Q

Where is ITT sensed?

A

Between the compressor and power turbine.

44
Q

What are ITT limits during start ON THE AEDD?

A

400-1000 deg C

45
Q

After start, what are the ITT limits ON THE AEDD?

A

400-820 deg C

46
Q

How is N1 measured?

A

By a magnetic pulse sensor in the accessory gearbox.

47
Q

What are normal operating limits ON THE AEDD?

A

60 - 104%

48
Q

Where is IOAT measured?

A

By the T-1 sensor in the inlet plenum.

49
Q

When does the digital readout for the cockpit pressure indicator turn yellow?

A

When it is greater than 19,000 ft, the amber CKPT ALT will turn on

50
Q

When does the delta P display turn red?

A

When it exceeds 3.9 to 4.0 psi.

51
Q

Where is hydraulic pressure measured?

A

A pressure sensor located on the power pack reservoir.

52
Q

If the hydraulic pressure falls below ________ or rises above ___________, the display changes color to indicate caution.

A

1800, 3500

53
Q

What are the limits of the DC Volts and DC Amps indicators?

A

Amber : Up to 21.9 V
White : 22.0 - 29.5 V
Red: 29.6 V and above

54
Q

How many volts does the external power receptacle provide?

A

28 VDC

55
Q

What does the hot battery bus power?

A 
FDR Maintenance Light
OBOGS
Ram Air Valve
Clocks
ELT

Battery Switch
Emergency Flaps

56
Q

What does the hot battery bus do?

A

Provides continuous essential power to components which are required to operate continuously or may be necessary in an emergency.

57
Q

What are the details of the secondary power components on the T-6A?

A

Primary Battery: 24VDC, 42 Amp Hour

Auxiliary Batter: 24 VDC, 5 Amp Hour

58
Q

How are the battery switches held?

A

They are magnetically held and electrically interlocked.

59
Q

Where is the external power receptacle?

A

Bottom of the left, aft fuselage, below the left avionics bay door.

60
Q

Where are knee board lights mounted?

A

On the front of each forward and aft glareshield.

61
Q

How many times doe the anti-collision strobe lights flash per minute?

A

30 times

62
Q

What is the order of fuel from the collector tank to the engine?

A

From the tank, through the manifold valve, through the maintenance shutoff valve, through the fuel filter, through the firewall shutoff valve, through the low px pump, through the high px pump, to the FMU, to the fuel flow sensor, to the engine.

63
Q

How is refueling shutoff automatically controlled?

A

Through the level control pilot valves located at the outboard tip of each wing.

64
Q

How long does defueling take?

A

5 minutes

65
Q

What signals the boost pump to go on?

A

A 10 psi pressure switch senses less than 10 psi in the motive flow fuel line.

66
Q

The fuel probe in the selector tank provides ________ compensation and fuel ________ measurements.

A

temperature, density

67
Q

When do the L FUEL LO and R FUEL LO lights come on?

A

When their respective tank is below 110 lb

68
Q

What is normal PPH for cruise?

A

350 PPH

69
Q

How are wing tanks vented?

A

Through vent lines which provide vacuum and pressure relief for the tanks.

70
Q

What prevents fuel from draining to the outside if parked on a sloped surface?

A

Float valves

Systems 1 (22-07) (12 decks)

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