Powerplant

Question 1

Normal TO SHP

Answer 1

4580

Question 2

MTOP SHP

Answer 2

5071 SHP

Question 3

PEC stands for

Answer 3

propeller electronic control

Question 4

WHen does the DC starter generator convert to a generator

Answer 4

at 50% NH

Question 5

Whats on the engine accessory gear box?

Answer 5

dc starter gen
pma (permanent magnet alternator) - provides power to fadec
oil pump
fmu (fuel metering unit)

Question 6

What does the PMA do?

Answer 6

primary source of power to FADEC, independent coils provide power to individual channels of FADEC (2), functions above 20% NH, ess busses provide power below 20% NH and during PMA malfunction

Question 7

What is on the prop reduction gear box?

Answer 7

AC generator (oil cooled)
Hydraulic Pump
Pitch Control Unit (PCU)
Prop overspeed governer (POG)

Question 8

What do the prop levers control between flight idle and max?

Answer 8

initiate fuel demands

Question 9

What is prop constant speed governed range?

Answer 9

Between flight idle and firewall

Question 10

What is beta range

Answer 10

disc to flight idle

Question 11

What is prop constant reverse speed governor range

Answer 11

max/rev to disc

Question 12

When is the propeller ground range light on?

Answer 12

power levers between max reverse and flight idle

Question 13

Limitation on MCR power rating

Answer 13

do not use below 10,000 feet or in icing conditions

Question 14

What does the FADEC do?

Answer 14

Controls fuel scheduling
controls various engine bleed valves
NH overspeed protection
controls automatic start sequence
supplies voltage to propeller electronic control (pec)
monitors and detects faults

Question 15

What does the RDC NP switch do?

Answer 15

Pressing the switchlight prior to advancing cond levers to max 1020 for landing, will keep the props at 850 NP for purposes of noise reduction.

Question 16

What does the MCL button do?

Answer 16

Gives an extra 3% TORQUE for climbing with the condition levers pulled back to 850 RPM

Question 17

What does the MCR switch do?

Answer 17

After level-off the MCR rating switch is pushed when cruise power is called for (cond levers will already be at 900)
“pushing the MCR switch will result in a max cruise power rating at 900”

Question 18

What does the event marker button do?

Answer 18

will capture and store pertinent system data for maintenance when pressed after and anomaly

Question 19

What does ATPCS stand for and do?

Answer 19

Automatic Takeoff Power Control System. Automatically armed for takeoff resulting in an uptrim of power in case of engine loss (10%), limited up to MTOP

Question 20

When does ATPCS arm?

Answer 20

when both engine are equal to or above 50% torque and both power levers are at a “high” angle

Question 21

The ATPCS provides auto uptrim when

Answer 21

torque on failed engine drops below 25%

Question 22

What do the prop counterwheights do?

Answer 22

gives the blade a natural twisting moment towards coarse pitch (feather)

Question 23

What does POG stand for?

Answer 23

propeller overspeed governor, feathers prop in event of an overspeed, driven by prop reduction gear box

Question 24

What does the auxiliary propeller feathering pump do

Answer 24

automatically feathers prop or manually with alt feather switch, DC motor

Question 25

What does the automatic synchrophase system do

Answer 25

reduced prop noise, compares right prop (slave) to the left prop (the master), does not operate during takeoff (props at 1020)

Question 26

What does the pcu do

Answer 26

the pcu increases the pressure of fine pitch oil to move the propeller pitch

Question 27

When will the prop ground range lights illuminate?

Answer 27

power levers are moved aft of the flight idle gate to indicate that prop blade angles are in the ground range of operation

Question 28

How is the autofeather system armed?

Answer 28

both PLAs above 60 degrees

both torques above 50%

Question 29

When does the autofeather work?

Answer 29

torque on failed engine drops below 25% for 3 seconds

Question 30

If you don’t get A/F ARM below __ kts then ____

Answer 30

80 kts then abort

Question 31

Describe engine ignitor system

Answer 31

each engine ignition system has one exciter and two igniter plugs in the combustion chamber, activated and deactivated automatically by FADEC during start, flameout or sure, igniters are inactive during normal engine operation

Question 32

Describe the engine start system

Answer 32

When start switchlight is selected the starter gen rotates the NH compressor through accessory gearbox, at 8% NH the FADEC commands ignition on and schedules fuel flow, the cond lever must be moved to start & feather position at first indication of NH, only on igniter is commanded on to check for faults, if no ITT rise of 20 degrees after 8 seconds, second igniter is commanded on and fault is logged, at 50 % NH FADEC commands ignitors off, and allows engine to accelerate to 64.2% at DISC position, SELECT switch release to center position, START switchlight goes out, up to 50 seconds later, SELECT segment of start switchlight goes out.

Question 33

How long without ignition until the start is considered a no light off?

Answer 33

16 seconds

Question 34

FADEC GROUND START PROTECTION

Answer 34

no ignition within 16 seconds of fuel flow (no light off)
ITT limit of 920C exceeded (hot start)
50% NH not reached within 70 seconds (hung start)

Question 35

FADEC In-flight start protection

Answer 35

No FADEC abort functions, both igniters commanded on, In-flight status is sensed 75 KCAS or WOW if airspeed invalid