MANUFACTURER: The Boeing Company Model 777-200
and -300 Series Airplanes Equipped With Pratt and Whitney
Engines SUBJECT: Airworthiness Directive 2011-09-11
SUMMARY: This AD requires repetitive
inspections for hydraulic fluid contamination of the interior of
the strut disconnect assembly; repetitive inspections for
discrepancies of the interior of the strut disconnect assembly, if
necessary; repetitive inspections of the exterior of the strut
disconnect assembly for cracks, if necessary; and corrective action
if necessary. This AD also provides an optional terminating action
for the inspections.
This AD was prompted by reports of system disconnect boxes that
have been contaminated with hydraulic fluid and, in one incident,
led to subsequent cracking of titanium parts in the system
disconnect assembly. We are issuing this AD to detect and correct
hydraulic fluid contamination, which can cause cracking of titanium
parts in the system disconnect assembly, resulting in compromise of
the engine firewall. A cracked firewall can allow fire in the
engine area to enter the strut and can lead to an uncontained
engine strut fire if flammable fluid is present.
Cracking of the disconnect box may also reduce the effectiveness
of the fire extinguishing system in the engine compartment and
could contribute to an uncontained engine fire. In addition,
a cracked disconnect box can leak flammable fluids into the engine
core, which can initiate an engine fire, and lead to one or both
fire conditions discussed above.
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