July 17,2013
PROPOSED RULES
Airworthiness Directives; The Boeing Company Airplanes [FR DOC# 2013-17138]
SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain
The Boeing Company Model 727 airplanes. This proposed AD is intended to
complete certain mandated programs intended to support the airplane
reaching its limit of validity (LOV) of the engineering data that support
the established structural maintenance program. For certain airplanes, this
proposed AD would require modification of the web of the horizontal
stabilizer center section rear spar. For the other airplanes, this proposed
AD would require an inspection for cracks in the web, and repair or
modification as applicable. We are proposing this AD to prevent cracking at
the upper fastener holes in the riveted web in the horizontal stabilizer
center section rear spar, which could result in failure of the spar forging
and lead to horizontal stabilizer separation and loss of control of the
airplane.
Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes [FR DOC# 2013-
17142] SUMMARY: We propose to adopt a new airworthiness directive (AD) for
Pilatus Aircraft Ltd. Model PC-12/47E 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 common grounding of both the pilot Primary Flight Display (PFD) and the
Electronic Standby Instrument System (ESIS). If the common ground fails
both navigations systems could fail simultaneously, which 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; Beechcraft Corporation Airplanes [FR DOC# 2013-
17146] SUMMARY: We propose to supersede airworthiness directive (AD) 2011-
27- 51 that applies to certain Beechcraft Corporation Models 1900, 1900C,
and 1900D airplanes. AD 2011-27-51 currently requires inspecting the
elevator bob-weight and attaching linkage for correct installation and for
damage or deformation to the weight and/or weight bracket with corrective
action as necessary. Since we issued AD 2011-27-51, a secondary elevator
bob-weight stop bolt has been designed. This proposed AD would require
installation of the secondary elevator bob- weight stop bolt. The elevator
bob-weight (stabilizer weight) traveling past its stop bolt may allow the
attaching linkage to move over-center and lead to reduced nose down
elevator control, which could result in loss of control. We are proposing
this AD to correct the unsafe condition on these products.
Airworthiness Directives; the Boeing Company Airplanes [FR DOC# 2013-17139]
SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain
the Boeing Company Model 777-200 series airplanes. This proposed AD was
prompted by reports of smoke or flames in the passenger cabin of various
transport category airplanes, related to the wiring for the passenger cabin
in-flight entertainment (IFE) system, cabin lighting, and passenger seats.
This proposed AD would require, for certain airplanes, doing an inspection
of the electrical power control panel for a certain part number, and
corrective action if necessary; and for certain other airplanes, installing
a new electrical power control panel, and making changes to the wiring and
certain electrical load management system (ELMS) panels. We are proposing
this AD to ensure that the flightcrew is able to turn off electrical power
to the IFE systems and other non-essential electrical systems through a
switch in the flight compartment in the event of smoke or flames. In the
event of smoke or flames in the airplane flight deck or passenger cabin,
the flightcrew’s inability to turn off electrical power to the IFE system
and other non-essential electrical systems could result in the inability to
control smoke or flames in the airplane flight deck or passenger cabin
during a non-normal or emergency situation, and consequent loss of control
of the airplane.
RULES
Airworthiness Directives; Austro Engine GmbH Engines [FR DOC# 2013-16951]
SUMMARY: We are adopting a new airworthiness directive (AD) for all Austro
Engine GmbH model E4 engines. This AD requires removing from service
certain part number waste gate controllers. This AD was prompted by several
reports of power loss events due to fracture of the waste gate controller
lever. We are issuing this AD to prevent engine power loss or in-flight
shutdown, which could result in loss of control and damage to the airplane.
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