AD NUMBER: 2007-05-11
MANUFACTURER: Bombardier
SUBJECT: Airworthiness Directive 2007-05-11
SUMMARY: The FAA is superseding two existing
airworthiness directives (ADs), that apply to certain Bombardier
Model CL-600-2B16 (CL-604) airplanes and Model CL-600-2B19
(Regional Jet Series 100 & 440) airplanes. These models may be
referred to by their marketing designations as RJ100, RJ200, RJ440,
CRJ100, CRJ200, CRJ440, and CL-65. One existing AD requires
replacing the horizontal stabilizer trim control unit (HSTCU) with
a new HSTCU. The other existing AD requires revising the airplane
flight manual (AFM) to advise the flight crew of procedures to
follow in the event of stabilizer trim runaway, and in the event of
MACH TRIM, STAB TRIM, and horizontal stabilizer trim malfunctions;
and revising the AFM to require a review of the location of certain
circuit breakers. That AD also requires doing a functional check of
the stabilizer trim system and installing circuit breaker
identification collars, and provides an optional terminating
action. This new AD requires the previously optional terminating
action and requires further revisions to the AFM. This AD also
requires the removal of certain AFM revisions. This AD results from
reports of trim problems including uncommanded trim, trim in the
opposite direction to that selected, loss of trim position
indication and, in one case, potential loss of trim disconnect
capability. We are issuing this AD to prevent these events, which
could result in conditions that vary from reduced controllability
of the airplane to loss of control of the airplane.
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