AD NUMBER: 2007-23-10
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-23-10 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for certain Boeing
Model 737-600, -700, -700C, -800 and -900 series airplanes. This AD
requires an inspection of the fillet sealant at the inboard and
outboard sides of the receptacles in the wheel wells of the main
landing gear, and related investigative/corrective actions if
necessary. This AD results from reports of in-production airplanes
with missing or insufficient fillet sealant around the receptacles
at the disconnect bracket. We are issuing this AD to prevent
corrosion damage due to missing or insufficient fillet sealant.
Such corrosion could result in insufficient electrical bonding
between the connectors andthe disconnect bracket, and consequent
loss of the shielding that protects the wire bundles from
lightning, electromagnetic interference (EMI), and high intensity
radiated field (HIRF). Loss oflightning, EMI, and HIRF protection
at those receptacles could cause failure of multiple electrical
systems and subsequent loss of several critical control systems
that are necessary for safe flight. In addition, a lightning strike
could cause arcing in the fuel tank; this potential ignition
source, in combination with flammable fuel vapors, could result in
a fuel tank explosion and consequent loss of the airplane.
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