Tom-D
Taxi to Parking
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Tom-D
This is from AC 20-37e:
205. LIMITATIONS. Operational and service personnel should be familiar with the following limitations during any inspection.
e. Blade Polishing. The FAA receives frequent inquiries from airplane owners and maintenance personnel asking whether it is acceptable to polish propeller blades. It is almost always not acceptable. Corrosion protection such as paint and anodize should not be removed from the surface of a propeller blade. Propeller blades must be maintained to the type design. If the original design had corrosion protection and the instructions for continued airworthiness call for corrosion protection, then the corrosion protection should be maintained to those instructions.
206. PROCEDURES FOR MAINTENANCE.
b. Operators Cannot Do the Following:
(8) Do not polish blades unless specifically permitted by the manufacturer’s instructions.
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/895eff1883ee06768625707b00727fd6/$FILE/AC%2020-37e.pdf
"Should not" is not a requirement. nor is any AC
plus the ICAs do not require the Anodizing to remain in place during service.and give no limits for how much can be removed and still be airworthy.
Type design does not give the protection given to a prop, it gives the spec for metal alloy, shape, and size. during manufacturing.
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