Propellers

Question 1

Describe the propellers

Answer 1

four blade, spring loaded, hydraulically operated, counterweighted, full feathering

Question 2

Where does the propeller RPM gauge get its power?

Answer 2

Self generating power

Question 3

Minimum prop idle

Answer 3

1,150 rpm

Question 4

What is the rpm during takeoff?

Answer 4

2000rpm

Question 5

What is the rpm during cruise?

Answer 5

1,600rpm

Question 6

What is the maximum rpm in reverse?

Answer 6

1,900rpm

Question 7

Describe the Primary Governor

Answer 7

Adjustable.
Green arc from 1600-2000rpm.
Uses engine oil pressure boosted by 200psi.
Decrease in oil pressure increases pitch (toward feather).

Question 8

Describe the Overspeed Governor

Answer 8

Protects against failure of the Primary Governor.
Not adjustable.
If primary fails, limits RPM to 104% of Primary max value (2080rpm).
Test using GOV TEST switch.

Question 9

Describe the Fuel Topping Governor

Answer 9

Protects against failure of the prop hub system.
Attempts to limit prop rpm by reducing engine speed.
If the primary governor is unable to control prop rpm, the FT governor will limit fuel flow to engine.
106% of selected N2 in flight
95% of selected N2 in reverse

Question 10

Describe Synchrophaser- Type I

Answer 10

Master and Slave
L engine is master
MUST be turned off for takeoff and landing

Question 11

Why must Type I prop synch be turned off for takeoff and landing?

Answer 11

Master and slave system: if the L engine fails, the R will attempt to match, effectively cutting all power to the engines

Question 12

PROP SYNCH ON

Answer 12

Landing gear handle position down
Prop synch on
Type I only

Question 13

Describe Synchrophaser- Type II

Answer 13

NO master and slave: speeds up slow prop
MAY be left on for T/O & LD
NO annunciator

Question 14

Describe Autofeather

Answer 14

automatically feathers if torque falls below 260 ft/lb

Question 15

Maximum transient rpm

Answer 15

2,200 (5 secs)

Question 16

Normal Maximum rpm

Answer 16

2,000rpm

Question 17

Maximum rpm with failed Primary Governor

Answer 17

2080

Question 18

Prop overspeed test range

Answer 18

1830-1920 rpm

Question 19

What happens below 400 rpm with autofeather on?

Answer 19

Autoignition is turned on.

Opposite autofeather is turned off.

Question 20

What happens at 260 rpm with autofeather on?

Answer 20

Propeller feathers

Question 21

Why don’t we retard the power lever to confirm an engine failure?

Answer 21

It disarms the autofeather

Question 22

Why is max reverse rpm 1900?

Answer 22

FCU air pressure is bled-off by the Fuel Topping governor to limit prop rpm