Mod 2-3 Flashcards
where is most used contact split race bearing ?
junction between stationary side of the heli to the rotating drive train
identify the bering part
A-OUTER RACE
B-SHOULDERS
C-INNER RACE
D-BEARING
E-CAGE
Main Rotor Grips must be secured from:
Rotation beyond 90 degrees
Split Cones (P/N: 206-010-003-001) may do what when the hub is raised?
fall
Prior to removal of the main rotor blade from the hub, the nut securing the Blade Latch must be loosened. Only the nut on the _____ side is to be loosened.
trailing edge
The hardware securing the swashplate to the main rotor gearbox oalso secures the
main rotor mast
The spar of the R22 main rotor blades is made of
stainless steel
On a main rotor blade, exposure of the bond line between the skin and the spar due to erosion can lead to:
Debonding of the blade skins
R22 Main Rotor Blade Pitch bearings are lubricated with
Oil A257-4
Bell 206 Main Rotor Heads (C-GKGO) are lubricated with
Grease
According to Bell Helicopters, what is the definition of Total Indicated Runout (TIR)?
measure of eccentricity of a shaft, measurements are usually taken with a dial indicator at specifics points as the shaft rotate through 360 degrees
According to Bell Helicopters, what is the cause of Brinelling?
surface depression.
Severe blow: extreme heavy pressure, rollers skidding or sliding instead of rolling
Where is the tail rotor driveshaft rotated to check the runout on the R22?
A166 clutch shaft
The duplex bearing must be:
In matched serial numbered sets
Swashplate Friction is the friction between the bearing set and the:
Pivot Sleeve
A new complete Swashplate shim has a total thickness of:
0.041”
Finish this sentence: When installing the bolts during the swashplate friction adjustment, ensure the countersunk side of the washers is
Toward bolt head.
what does a tip shape of the blades
Reduce losses caused by tip vortices. This results
in increased efficiency, translatin ng into higher
speed and less noise
tip weights as part of the design
to allow more time to setup autorotation, and more time to flare during landing
tip weights as part of on going maintenance
span-wise balance
abrasion strips can be
stainless
blade tape
nickel
main rotor blade foldings requires?
- Modified blade pins or aTachment hardware.
- Addition of hard-‐points to attach supports for the blades
what is gap fit ?
- a distance between parts
- often used to allow for expansion or other deformation resulting from temp or load
what is preload ?
- a clamping force applied typically to a bearing
- prevents or limits movement
what is pinch fit?
is a negative gap, similar to preload
opposite to the gap fit
