AD NUMBER: 2007-02-03
MANUFACTURER: Bombardier
SUBJECT: Airworthiness Directive 2007-02-03
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD), which applies to certain bombardier
Model DHC-8-400 series airplanes. That AD currently requires
revising the airplane flight manual (AFM) to advise the flightcrew
of appropriate procedures to follow in the event that a main
landing gear (MLG) fails to extend following a gear-down selection.
That AD also currently requires repetitive replacement of the left
and right MLG uplock assemblies with new assemblies;and an
inspection of the left and right MLG uplock rollers for the
presence of an inner low friction liner, and corrective actions if
necessary. This new AD revises the requirement for replacing the
left and right MLG uplock assemblies by allowing replacement with
alternative parts. For a certain MLG uplock assembly, this new AD
requires repetitive inspections of the uplock hatch lower jaw for
the presence of a wear groove and replacement with an improved part
if necessary. For a certain MLG uplock assembly, this new AD
requires repetitive inspections of the uplock roller toensure that
it rotates freely and replacement with a new part if necessary.
This new AD allows optional replacement of the left and right MLG
uplock assemblies with improved parts, which ends the requirements
of the AFM revision and repetitive replacement and inspections.
This new AD removes airplanes from the applicability. This AD
results from development of a terminating action. We are issuing
this AD to ensure that the flightcrew has the procedures necessary
to address failure of an MLG to extend following a gear-down
selection; and to detect and correct such failure, which could
result in a gear-up landing and possible injury to passengers and
crew.
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