ATA 61 - Propeller Flashcards
What is the Dowty Rotor range?
+83.5° (Feather) to -16.5° (Reverse)
When is the green BETA light indicating?
When the propeller pitch is less than +8° and the system is in the Beta control mode (Power Lever below flight idle)
When will the sump reserve in the PGB be used?
When Manual Feather is selected with the Propeller Pump Switch.
AUTOCOARSEN switch must be turned OFF.
What is the blade angle needed when rigging the Beta Tube?
15°
What are the Auto Coarsen Modes on a Saab 340B?
- High Power (Take-Off and Go-Around)
- Low Power (Cruise, Approach and Landing)
What are the Auto Coarsen Mode on a Saab 340A?
Only High Mode (Take-Off and Go-Around)
Where is the Synchrophasing Control Box located?
Under the cabin floor (in front of the wings)
When will the Synchrophasing system be activated and what happens then?
Manually activated with the PROP SYNC switch on the pedestal.
The Control Box will compare the two signals (one from each propellers magnetic pickup). If the difference is less than 10-15 rpm, the slower propeller RMP will increase to match the faster.
How will the Overspeed Governor limit the RPM and to which RPM?
By cutting off the pressure and draining fine pitch oil. This will limit the propeller RPM to 1450.
Where are the constant speed governor positioned?
Inside the PCU
Where is the overspeed governor positioned?
On the fwd face of the PGB
When will the Overspeed Governor coarsen pitch?
Only if the PCU (Pitch Control Unit) pilot valve has failed in an underspeed condition.
What arms the Autocoarsen High Mode?
- Power Lever in T/O position (64°)
- L & R Engine P3 over 120psi
- L & R Engine above 50%
(If one of the engines fails these chriterias, that one will autocoarse solo)
