Exam Attempt 1 Questions Flashcards
What is regarded as short term storage?
3 months
What is the best storage temp?
10-20 degrees
How long does a blade heating element cycle remain energised?
15-30 seconds
What is a slow heating cycle used for?
-6 or below
What do large turbo props use for de icing?
Pnuematic
What is the greek letter for blade angle?
Theta
What is the equivalent of fine blade angle?
Low
A blade has nicks from sand and stones on the LE, how should it be dealt with?
Removed but profile maintained
How are protective strips attached to the tip?
Countersunk screws
What is the purpose of synchrophasing?
To run the blades a few degrees behind the master
How does synchrophasing happen?
PCU and MPU- Key word one revolution
What is the efficiency of props?
80%
What happens when a constant speed prop is put nose up?
AoA increases
What is the max ground run speed?
25kts
What conditions do dynamic balancing take place under?
Cruise power and rpm
What would cause a prop not to reach its specified rpm with zero boost?
Incorrect blade angle
Benefit of carbon props?
Stronger and lighter
How does a prop generate thrust?
Large mass of air slowly rearwards
What is another name for angle of advance?
Helix angle
One about reverse pitch (tbc)
…
One about disc braking, heres some key facts…
Negative angle of attack, proportional to forward speed of aircraft.
What oil does the pitch trim use?
Engine oil
On single acting props what are the counterweights for?
Towards feather (higher pitch)
What type of blade uses counterweight latches?
Single acting props
What is the purpose of foam in hollow steel blades?
Reduce vibration
What is the purpose of dynamic balancing?
Moment of imbalance
How is the pitch changed?
Power or condition lever
What is the purpose of the strip on the prop hub?
Protect from stone chips and erosion?
When is the up trim triggered?
Below 25% torque
