Propeller Maintainence Flashcards
Where do we static balance
During overhaul
What does static balancing do
Ensures centre of gravity lies on axis of rotation
What is horizontal balancing
Vanish or paint added light blade
Solder to metal tips
Vertical balancing
Weights added to hub
Static balancing on metal propeller tolerance
5700kg aircraft tolerance is 2gm
On a metal propeller to static balance where is metal removed from
Heavy side
How is balance corrected in using lead wool
Placing lead wool into balancing tube in hollow root of blade
Where are welch plugs
The head of bolt
When is dynamic balancing done
On a running engine
What system does turboprop to balance
Propeller balance monitoring system
What is aerodynamic balancing used for
High performance propellers
What is blade indexing
Correcting force for aerodynamic balancing
Where is correction factor marked
Blade root
What is blade tracking
Ability of one blade to follow the the other in the same plane of rotation
How are bent blades indicted
Tracking differences larger then 3mm
How intact does the surface coating need to be
100%
What does loose tipping rivets indicate
Wood underneath is damaged and propeller out of service immediately
What do you check for in wooden propellers
De lamination in layers of wood
When are attachment bolts re tightened
After 25 flying hours
What subjects a metal propeller to metal fatigue
Caused by dynamic loads
What causes cracks to extend in metal propeller
Additional bending and centrifugal forces
When should you never taxi
High power
How should you pull small aircraft
By root
When do you inspect metal propeller
Every 100 hours or annual check inspect propeller
