Ha-420, Ata 71-80, Powerplant

Front 1

Describe the low pressure rotor

Back 1

Single-stage wide-chord fan, two-stage axial LP compressor, driven by two-stage axial flow LP turbine, attached to LP shaft to form LP rotor assembly

Front 2

What protects the LP rotor

Back 2

OSP, Overspeed protection system

Front 3

What are the overspeed protection systems on the LP turbine

Back 3

Mechanical system in case of LP shaft failure

Front 4

How does Electronic overspeed Protection work

Back 4

FPMU and PMA energize HP shutoff valve to close, cuts off fuel

Front 5

How does mechanical LP shaft separation protection system work

Back 5

Bell crank pushes back on shutdown solenoid, high pressure shutoff valve (HPSOV) closes in Fuel pressure management unit (FPMU), engine shuts down.

Front 6

What is the high pressure (HP) rotor?

Back 6

Single stage centrifugal compressor, single-stage HP turbine, on the HP shaft, bevel gear drives accessory gear box.

Front 7

What protects HP rotor

Back 7

Electronic overspeed protection system

Front 8

How does electronic overspeed protection system work

Back 8

Signal from speed sensor in FPMU and signal from PMA energizes solenoid for HP shutoff valve, cuts fuel

Front 9

What is the thrust link

Back 9

Steel link between mount yoke and forward pylon spar

Front 10

What does the thrust link do?

Back 10

React thrust into the spar without bending loads into the yoke

Front 11

Define FPMU

Back 11

Fuel Pressure Metering Unit

Front 12

Define PMA

Back 12

Permanent Magnetic Alternator

Front 13

How to perform dry motor.

Back 13

Spin motor without fuel, no igniters

Front 14

How to perform wet motor

Back 14

Spin motor with fuel, no igniters

Front 15

What would wet motor be used for

Back 15

Leak checks, removal from preservation, priming of fuel system

Front 16

What would dry motor be used for

Back 16

AGB operation, lube pump operation, oil leaks, fuel leaks, rotation of engine rotors, engine indications, remove unfurled fuel from hot section.

Front 17

List low pressure fuel system components in order that fuel flows through them

Back 17

FPMU fuel inlet, booster pump, fuel/oil heat exchanger, fuel filter/bypass valve, fuel filter differential pressure sensor, fuel filter bypass valve

Front 18

Describe FADEC power supplies

Back 18

battery bus or PMA through PMA rectification and diode “OR” gate, whichever voltage is higher

Front 19

What section of FPMU controls whether motive flow is available

Back 19

Ecology valve

Front 20

Allowable fuel system maintenance.

Back 20

R/R FPMU, R/R fuel oil heat exchanger, filter change, replace/rig bleed valve cables, rig/replace overspeed protection cable, replace differential pressure sensor

Front 21

List FADEC protective functions during start

Back 21

Hot start protection, ignition loss, hung start, no N1 rotation.

Front 22

How do N1 and N2 sensors work

Back 22

Sensing magnetic fields/frequency

Front 23

How is ITT measured

Back 23

T5 probes, EGT and cold junction temperatures.

Front 24

How many T5 probes

Back 24

8 total. 4 channel A, 4 channel B

Front 25

Where is ITT measured

Back 25

Exit of high pressure turbine and inlet of low pressure turbine

Front 26

Describe N1 sync system

Back 26

Sets N1 commands for both engines to be the same, left engine is master, right is slave.

Front 27

What other system relies on N1 sync.

Back 27

Cruise speed control

Front 28

All scavenge oil must flow through which component

Back 28

Chip detector

Front 29

Describe FOHE

Back 29

Pulls heat from oil into fuel

Front 30

What are indications of FOHE malfunctions

Back 30

Rising oil level indicates fuel leak, oil smells like fuel, oil temp increase

Front 31

Which bearings are ball type bearings

Back 31

No 1 and No 2, forward engine

Front 32

Is FADEC protection available in flight

Back 32

No

Front 33

Describe how each FADEC channel controls the igniters

Back 33

Channel A/B, each channel controls both igniters randomly

Front 34

Describe engine shutdown sequence on ground

Back 34

Throttle levers to cutoff, overspeed shutdown solenoid is tested

Front 35

How is overspeed shutdown solenoid tested.

Back 35

ECU closes fuel metering valve, no more that two seconds after throttle pulled to cutoff

Front 36

What is N2 sensor

Back 36

Monitors engine core rotational speed

Front 37

Where is N2 sensor

Back 37

FPMU and PMA

Front 38

What is N1 sensor

Back 38

Senses fan speed

Front 39

Where is N1 sensor

Back 39

Mounted on the intermediate case (IMC)

Front 40

What does N1 sensor monitor

Back 40

Low pressure rotor shaft speed (fan speed)