Mon, Apr 26, 2010
AD NUMBER: 2010-09-05
MANUFACTURER: The Boeing Company Model 737-600,
-700, -700C, -800, -900, and -900ER Series Airplanes
SUBJECT: Airworthiness Directive 2010-09-05
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) that applies to all The Boeing Company
Model 737-600, -700, -700C, -800, -900, and -900ER series
airplanes. The existing AD currently requires doing a detailed
inspection of the inboard and outboard aft attach lugs of the left
and right elevator control tab mechanisms for gaps between the
swage ring and the aft attach lug, and between the spacer and the
aft attach lug; trying to move or rotate the spacer using hand
pressure; and replacing any discrepant elevator tab control
mechanism, including performing the detailed inspection on the
replacement part before and after installation. For certain
airplanes, this new AD adds improved repetitive inspections for
discrepancies of the inboard and outboard aft attach lugs of the
left and right elevator control tab mechanisms, and replacement if
necessary. For certain other airplanes, this new AD adds a one-time
inspection for discrepancies of the inboard and outboard aft attach
lugs of the left and right elevator control tab mechanisms, and
replacement if necessary. For airplanes on which the elevator
control tab mechanism is replaced with a certain mechanism, this AD
requires repetitive inspections for discrepancies of the elevator
control tab mechanism and replacement if necessary. Replacing the
elevator control tab mechanism with a new, Boeing-built mechanism
terminates the repetitive inspections. This AD results from a
report of failure of the aft attach lugs on the left elevator tab
control mechanism, which resulted in severe elevator vibration;
this event occurred on an airplane on which the existing AD had
been done. We are issuing this AD to detect and correct a loose
bearing in the aft lug of the elevator tab control mechanism, which
could result in unwanted elevator and tab vibration. Consequent
structural failure of the elevator or horizontal stabilizer could
result in loss of structural integrity and aircraft control.
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