AMT_June-July_2021 - 23

product for an aluminum propeller and
around three weeks for a composite propeller,
given additional coatings that have
to be applied to the blades and have flash
times and cure times for each.
" Propeller overhaul is a very thorough
process that involves periodic disassembly,
cleaning, inspecting, repairing as necessary,
assembly, and testing to approved standards
and technical data, " added Frigge.
" Propeller repairs may include any and all
of the processes required for overhaul, but
are largely dependent on the unique circumstances
requiring repair station assistance. "
He continued that propeller inspection
and maintenance intervals vary depending
on the propeller model and circumstances.
Hartzell Service Letter HC-SL-61-61Y outlines
overhaul periods and service life limits
for propellers, governors, accumulators and
propeller damper assemblies. The propeller
owner's manual also provides instructions
for scheduled inspections and maintenance
requirements.
" Inspections and maintenance may also
be required for on-condition circumstances
such as service documents and special
inspections following events including foreign
object strikes, lightning strikes, etc., "
Frigge said. " Repairs involve removing the
damage, treating surfaces with Alodine
and paint in the case of aluminum blades.
Composite blade repairs would include
damage removal, addition of new composite
material, followed by finish procedures
and paint. "
Marinkovich said that the most common
damage they see is foreign object or ground
strikes, however, the most common reason
they reject a component is for corrosion.
" We probably reject more parts for corrosion
than we do for an A.D. or anything
else. Often there's excessive corrosion that
is non-repairable on either the blade, hub or
an internal component, " Marinkovich added.
For aluminum blades, Marinkovich
noted that each time they are overhauled
they get smaller and smaller until they go
below a minimum width and thickness
tolerance. Nicks, gouges, corrosion and
scratches on blade surfaces and edges
are all common damage that blades can
experience.
AviationPros.com/company/12091501
www.AviationPros.com 23
" Propeller overhaul is a very thorough process that
involves periodic disassembly, cleaning, inspecting,
repairing as necessary, assembly and testing to
approved standards and technical data. "

http://www.usaborescopes.com http://www.AviationPros.com/company/12091501 http://www.AviationPros.com

AMT_June-July_2021

Table of Contents for the Digital Edition of AMT_June-July_2021

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