THE COIN tap check provides an audible test for
structural composite blade damage.
HARTZELL PROPELLER
pages, you can determine whether you are capable
of making your own repairs or should trust them
to the manufacturer. The manual contains step-by-
step instructions on each minor repair and is a vital
resource for any repair and maintenance. Download
it at HartzellProp.com/manual170.
5. Contact Your Nearest RSF
If your propeller has sustained more than minor
damage, contact a Hartzell Recommended Service
Facility. This worldwide network of propeller repair
stations meets rigorous standards, including regular
on-site quality systems and process audits, technicians
who attend required training updates at Hartzell and
approved tools and equipment.
THE COIN TAP TEST
Best practices include getting factory training and
advice, along with making sure you understand
overhaul requirements, inspection differences,
repair criteria, and repair limits. One of the pri-
mary tests is a "coin tap" audible check of the blade
body and the blade erosion shield to identify any
discontinuities.
For the coin tap, you create a grid on the blade and
use a round metal disc to tap the blade, listening for
changes in the tone. You look for any de-bonding
in the blade body and in the laminates. If you find
issues, then you have to evaluate them from a size,
depth, and location perspective. In some specific
instances, an ultrasonic test may be needed, but
that is very limited.
AviationPros.com/company/10134757
CLASSES AND HOW-TO
VIDEOS
Kevin Ryan teaches
repair classes around the
world, and walks viewers
carefully through the
evaluation and repair
processes. Hartzell
Propeller has also created
a series of informative
how-to videos describing
how to repair Hartzell's
structural composite propellers when they suffer minor
damage. These videos are helpful both for professionals
and do-it-yourselfers. The techniques to repair Hartzell's
structural composite propeller are pretty straightforward
but if it looks too intimidating, a recommended ser vice
facility is always willing to help.
DEAN WARD is the director of aftermarket parts and service for Hartzell
Propeller Inc. Through his 30+ years with Hartzell Propeller, Ward has
gained wide ranging experience that uniquely qualifies him to lead the
Aftermarket Parts and Service Team. His team is responsible for aftermarket
sales and customer service, forecasting, export compliance, shipping, and
the Hartzell Service Center.