Sun, Dec 18, 2011
AD NUMBER: 2011-25-11
MANUFACTURER: Boeing 757-200, 757-200PF,
757-200CB, 757-300, 767-200, 767-300, and 767-300F series
airplanes.
SUBJECT: Airworthiness Directive 2011-25-11
ACTION: Final rule
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) for all The Boeing Company 757-200,
757-200PF, 757-200CB, 757-300, 767-200, 767-300, and 767-300F
series airplanes.
That AD currently requires revising the Limitations section of
the airplane flight manual (AFM) to advise the flightcrew of
procedures to follow to ensure that a fuel filter impending bypass
condition due to gross fuel contamination is detected in a timely
manner.
This new AD requires installing new operating program software
(OPS) (Version 7) of the engine indication and crew alerting system
(EICAS) in the EICAS computers. This AD also requires various
concurrent actions. This AD also retains the existing AD provision
that relieves certain airplanes (those equipped with certain EICAS
OPS versions) from the requirements. Accomplishment of the new
actions terminates the requirements of the existing AD.
This AD was prompted by an error in the EICAS OPS. The error
prevents the display of an advisory message to the flightcrew of a
left engine fuel filter contamination and imminent bypass
condition, which may indicate an imminent multiple engine thrust
loss or engine malfunction event due to fuel contamination. The FAA
is issuing this AD to correct the unsafe condition on these
products.
DATES: This AD is effective January 17,
2012
FMI:
AD
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