Fri, May 29, 2009
AD NUMBER: 2009-11-06
MANUFACTURER: M7 Aerospace LP Models SA226-AT,
SA226- T, SA226-TC, SA227-AC (C-26A), SA227-AT, SA227-BC (C-26A),
SA227-CC, and SA227-DC (C-26B) Airplanes
SUBJECT: Airworthiness Directive 2009-11-06
SUMMARY: We are adopting a new airworthiness
directive (AD) to supersede AD 2008-12-16, which applies to certain
M7 Aerospace LP SA226 and SA227 series airplanes. AD 2008-12-16
currently requires you to inspect wires and tube assemblies for
chafing, arcing, or insufficient clearance between components. If
chafing, arcing, or insufficient clearance between components is
found, AD 2008-12-16 requires you to clear, repair, and/or replace
all chafed wires, components, and tube assemblies. AD 2008-12-16
also requires you to cover the four-gauge wires leaving the battery
box with firesleeving and secure them with a clamp. Since we issued
AD 2008-12-16, M7 Aerospace LP has notified us that Model SA227-BC
(C-26A) was inadvertently left out of the Applicability section of
the AD, and they updated some of the service information due to
parts availability. Operators have also identified issues with
model applicability that needed clarification. Consequently, this
AD retains the actions of AD 2008-12-16, adds Model SA227-BC
(C-26A) to the Applicability section, and regroups the models for
clarification. We are issuing this AD to detect and correct chafing
of electrical wires, components, and tube assemblies. This
condition could result in arcing of exposed wires with consequent
burning of a hole in a hydraulic line or the bleed air line. This
failure could lead to a hydraulic fluid leak and a possible fire in
the engine nacelle compartment.
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