Federal Register Proposed Rules, Rules and Notices for July 8,2013

July 8,2013

PROPOSED RULES

Airworthiness Directives; Agusta S.p.A. (Type Certificate Currently Held by
AgustaWestland S.p.A.) (Agusta) Helicopters [FR DOC# 2013-16312] SUMMARY:
We propose to revise an existing airworthiness directive (AD) for the
Agusta Model AB139 and AW139 helicopters. The existing AD currently
requires inspecting the fuselage frame to detect fatigue cracks which could
lead to structural failure and subsequent loss of control of the
helicopter. Since we issued that AD, Agusta has developed a frame
reinforcement modification which supports extending the interval for
inspecting the fuselage frame for a fatigue crack. This proposed AD would
require inspecting the fuselage frame for a crack, but would reduce the
applicability from the existing AD to exclude helicopters modified by the
optional frame reinforcement modification. The proposed actions are
intended to detect a fatigue crack that could result in failure of the
fuselage frame and subsequent loss of control of the helicopter.

Airworthiness Directives; Diamond Aircraft Industries GmbH Airplanes [FR
DOC# 2013-16316] SUMMARY: We propose to adopt a new airworthiness directive
(AD) for Diamond Aircraft Industries GmbH Models DA 42, DA 42 NG, and DA 42
M-NG airplanes. This proposed AD results from mandatory continuing
airworthiness information (MCAI) originated by an aviation authority of
another country to identify and correct an unsafe condition on an aviation
product. The MCAI describes the unsafe condition as insufficient clearance
between the rod end safety washer and the nose landing gear attachment
lever causes the rod end to bend at each gear retraction sequence. We are
issuing this proposed AD to require actions to address the unsafe condition
on these products.

 

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