Hub Inspection - Cub Crafters CC11-100 Maintenance Manual

(b) Inspect the attaching bolts for worn or damaged threads and heads. Replace
damaged bolts with new ones.
(c) Inspect the spinner bulkheads for cracks or broken brackets. Replace if any
damage is noted.
(d) Be certain that the ignition switch is off and that both magnetos are grounded.
(e) Inspect for bruises, scars, or other damage to wood and blade leading edge
protection. Assume that your propeller is un-airworthy after any kind of impact
until qualified personnel have inspected it.
(f) All wood and metal tipping repairs must be made at the factory or by an
approved propeller repair station.
The saw slots in metal tipping are designed to crack across after several hours of use. This
(g) Check propeller balance whenever there is evidence of roughness on operation.
(h) If your propeller begins to show any of the following damage, it should be retired
from service:

Cracks in hub bore, bolt holes or counter bores,

A deep cut across the wood grain,

A long, wide, or deep crack parallel to the grain,

A separated lamination,

Oversize or elongated hub bore or bolt holes,

An appreciable warp (discovered by inspection or through rough operation),

More than 1" of the tips broken or an appreciable portion of wood missing or,

Obvious damage or wear beyond economical repair.

(4) HUB INSPECTION

(a) Remove propeller in accordance with previous instructions.
(b) Clean both propeller hub faces using light-grit Scotch-Brite pad and denatured
alcohol. It should be possible to remove most of any fretting marks and darkened
areas.
(c) Inspect the propeller's rear hub face for cracks and/or elongation of the bolt holes
and/or counterbores where the engine flange drive bushings are inserted.
Cracks
If cracks are evident on the hub face, take a razor blade and very gently try to
insert the corner of the blade. Most cracks will be paint cracks only, however, if
Manual number SC10000AMM
Date: 08/02/2010
CUB CRAFTERS, INC.
CC11-100 MAINTENANCE MANUAL
prevents cracks from occurring at other locations.
NOTE
6.3.16
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