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RIQ > T-6A Propulsion 1 SY103 > Flashcards

T-6A Propulsion 1 SY103 Flashcards

1
Q

Describe the engine cowling and it’s functions

A

The metal panels that cover the engine, decreasing drag and providing air intake.

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2
Q

What is the P&W PT6A Free Turbine

A

This refers to the fact that the compressor and turbines are not physically connected.
Air movement from one turbine to the other provides power to the propeller.

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3
Q

What is Reverse Flow

A

When air enters the engine at the rear and moves foreword during the combustion process.

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4
Q

What 3 elements are necessary for engine operation

A

Air
Fuel
Heat

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5
Q

What are the 3 major sections of the engine

A

Accessory compartment, gas generation section, power turbine section

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6
Q

Gas Generation Section Location and components

A 
-Located between accessory compartment & power turbine section-
Compressor inlet
Compressor
Combustion chamber
Compressor turbine
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7
Q

Gas Generation Functions 1

A

Air enters engine via compressor inlet, compressed by four-stage axial flow compressor and single-stage centrifugal flow compressor

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8
Q

Gas generation functions 2

A

Compressed air transferred to combustion chamber, compressed air mixed with furs and ignited, ignited mixture expands, expanded gassed drive compressor turbine, this perpetuates the cycle

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9
Q

Power turbine location and components

A 
-locates on the front section-
Power turbines
Exhaust case
Reduction gearbox
Propeller shaft
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10
Q

Exhaust components

A

Exhaust ports

Exhaust stacks

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11
Q

Exhaust purpose and location

A

-located on either side of the engine-

Gassed released rearward into the atmosphere providing small amount of additional thrust

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12
Q

Ignition system type and purpose

A

Type: dual ignition

Starter provides airflow, FMU provides fuel, ignition system produces heat source

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13
Q

Penis penis penis

A

PENIS

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14
Q

Ignition location and components

A

-ignition exciter mounted on the airframe-
Ignition exciter
2 high voltage igniter cables
2 spark igniters

An ignited cable runs from exciter to each igniter. Igniters locates at 4 and 9 o’clock positions around combustion chamber

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15
Q

Ignition control switch 1 location and positions

A

-located on right foreword switch panel in each cockpit-
Positions:
On
Norm

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16
Q

Power Control Lever (PCL) location and purpose

A

-located on left console panel in both cockpits-

Controls fuel flow to the engine, producing torque to the engine, thus controlling engine power and aircraft speed

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17
Q

How are PCLs connected

A

Front and rear PCLs are interconnected with a push-pull rod, providing identical control

18
Q

PCL positions 1

A

Max
Idle
Off (aft most position, used for shutdown)

19
Q

PMU location and purpose

A

-Located underneath the engine in the accessory compartment-

Processes power requests from PCL, primary function is to keep propeller within operating limits.

20
Q

PMU Switch 1 positions and location

A

-located on the right foreword switch panel-
Norm
Off

When I’m Norm, all PMU functions are active

21
Q

PMU switch 2

A

With PMU in off position (or if PMU Fails) all system limitation must be monitored manually

22
Q

PMU Status Indicators

A

Amber PMU STATUS: illuminates after landing so maintenance can be alerted the PMU has accommodated a fault.

PMU Status light in flight: Indicates in either of, or mismatched between the weight-on-wheels switches (the PMU will not revert to the ground mode upon landing)

23
Q

PMU Fail Indicators

A

PMU FAIL Is the second annunciator and is red. Indicates that the PMU is Non-functional

Accompanied by the illumination of the PMU STATUS indicator

MASTER WARN and MASTER CAUT lights flash and aural tone is heard

24
Q

PMU Power

A

The primary source of power comes from PMA (Primary Magnet Alternator, mounted on reduction gearbox)

PMA provides 32 VAC, which the PMU converts to DC. If PMA fails, power is provided through 28 VDC battery bus

25
Q

PMU Circuit Breaker

A

the circuit breaker is labeled PMU and located on the battery bus circuit breaker panel in the front cockpit

26
Q

Starter Location and Components

A

-The starter/generator is attached to the accessory gearbox. A shaft connects the compressor section and accessory gearbox-
During engine start, the starter/generator functions as a starter. after engine start, it acts as the generator.

27
Q

Starter Purpose

A

During Start: turn compressor in the accessory gearbox.
After Start: It becomes the Generator, provides 28 VDC power, which powers many aircraft systems, and charges the battery to 24VDC

28
Q

Starter Switch Location and Positions

A

Located on the right foreword switch panel in each cockpit.
Auto/Reset
Norm
Manual

29
Q

Starter Positions

A

“Auto/Reset”: Used for most engine starts

“Manual”: Used to manually motor the engine by holding for 20 sec (not normally used)

30
Q

Engine start sequence

A
  • PCL foreword until green ST READY Shows
  • Ingnition switch in NORM
  • Move starter to AUTO/RESET Position momentarily
  • green IGN SEL when igniters are energized
  • Annunciators extinguish during start sequence
31
Q

Oil System Purpose

A

The system provides steady flow of oil to engine bearings, reduction gears, accessory drives, and propeller.

System includes: pressure system, scavenge system, cooling system

32
Q

Oil System Components

A 
Oil Pump
Oil Scavenge System
Oil Cooler
Chip Detector
Oil Filter
33
Q

Oil Scavenge System

A

Returns the oil to the oil tank

34
Q

Oil Cooler

A

Scavenged oil is routed through the oil cooler before being returned to oil tank

35
Q

Oil Filter

A

Is also the bypass

Filters the oil in the oil tank

36
Q

Chip Detector

A

Located in the reduction gearbox, and senses metal particles and warns the pilot of possible gear damage

If metal is detected: red CHIP light illuminates and MASTER WARN light illuminates. (Tone also Heard)

37
Q

Oil Pressure Signals

A

Temp and pressure Measured by same ports in engine, but sent to both the engine/Systems display and a signal conditioning unit (SCU)

38
Q

Oil pressure range

A

Should be between 90-120 (green area on display)

during acrobatics should be between 40-130

39
Q

Propeller Purpose

A

The purpose of the propeller is to convert power into thrust. (4-blade, variable pitch, constant speed)

PMU and PIU control propeller speed (Np) to maintain Prop speed of 2000RPM

40
Q

When is 100% torque Available

A

From sea level to ~12,000 to 16,000’ MSL

41
Q

Reduction Gearbox

A

Transfers power generated by the engine to the prop, reducing engine output from 30,000RPM to prop operating speed of 2,000 RPM

42
Q

FMU connections

A

PCL is connected to the FMU via a flexible cable, and electrically connected the the FMU by way of the PMU

RIQ (20 decks)

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