If a Wood Propeller begins to show any of the following damage, it should be retired from service:
- Cracks in hub bore
- A long, deep wide crack parallel to grain
- Oversize or elongated hub bore or bolt holes
- An appreciable warp (discovered by inspection or through rough operation)
- An appreciable portion of wood missing.
A deep cut across wood grain.
- A separated lamination
- Obvious damage or wear beyond economical repair.
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