Federal Register Proposed Rules, Rules and Notices for June 24,2013

June 24,2013


Harmonization of Airworthiness Standards-Gust and Maneuver Load Requirements [FR
DOC# C1-2013-12445]

Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes [FR DOC# 2013-14967]
SUMMARY: We are superseding an existing airworthiness directive (AD) for Pilatus
Aircraft Ltd. Models PC-6, PC-6-H1, PC-6-H2, PC-6/350, PC- 6/350-H1, PC-6/350-H2,
PC-6/A, PC-6/A-H1, PC-6/A-H2, PC-6/B-H2, PC-6/ B1-H2, PC-6/B2-H2, PC-6/B2-H4, PC- 6/C-H2, and PC-6/C1-H2 airplanes. This AD results from mandatory continuing
airworthiness information (MCAI) issued 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 failure to inspect and maintain stabilizer-trim
attachment components and the flap actuator could result in loss of control. We are
issuing this proposed AD to require actions to address the unsafe condition on
these products.

Airworthiness Directives; Rolls-Royce plc Turbofan Engines [FR DOC# 2013-14922]
SUMMARY: We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc
(RR) model RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. This AD was
prompted by low-pressure (LP) compressor blade partial airfoil release events. This
AD requires a one-time ultrasonic inspection of LP compressor blades that had
accumulated more than 2,500 flight cycles (FC) since new. We are issuing this AD to
prevent LP compressor blade airfoil separations, engine damage, and damage to the





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