Tue, Jul 03, 2007
EASA TC Also Covers Aluminum-Bladed Props
Hartzell Propeller Inc. announced Monday it has received
European Aviation Safety Agency (EASA) approval for its
three-bladed ASC-II propeller. The approval also marks the first US
propeller manufacturer to receive an EASA Type Certificate.
The new certification applies to all Hartzell J3F Compact Series
3-bladed propellers, including the PHC-J3YF-1N/N7605 ASC-II
propeller, which is currently installed on the Cirrus SR22.
Introduced last year at
AirVenture, the Hartzell ASC-II consists of a
monocoque structure of advanced composite materials. It features a
carbon/Kevlar laminate, which is integrated into a co-molded
stainless steel shank. The outboard half of the leading edge is
protected with a co-molded electroformed nickel erosion shield.
Aluminum mesh is embedded into the laminate for lightning
protection.
Hartzell notes the ASC-II is the only certified advanced
structural composite propeller in the GA market. The prop has
proven its durability in testing, which included surviving a
simulated encounter with a four pound bird at rotation, taking a
direct hit of 200,000 amps of electricity to prove that it can
survive an encounter with lightning, and withstanding a direct pull
of 132,000 pounds reaching the limit of the test fixture without
failing (6.8 times the normal Cf load) to demonstrate a safety
margin in the event of an engine overspeed.
These special tests were performed in addition to the normal
battery of fatigue and endurance tests designed to demonstrate that
the propeller will have a long useful life and flight tests that
ensure stress levels fall within allowable limits for safety.
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