AD NUMBER: 2006-18-04
MANUFACTURER: Bombardier
SUBJECT: Airworthiness Directive 2006-18-04 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for 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,
CRJ100, CRJ200, and CL-65. This AD requires revising the Emergency
Procedures section of the airplane flight manual (AFM) to advise
the flight crew of additional procedures to follow in the event of
stabilizer trim runaway. For certain airplanes, this AD also
requires revising the Abnormal Procedures section of the AFM to
advise the flight crew of procedures to follow in the event of MACH
TRIM, STAB TRIM, and horizontal stabilizer trim malfunctions. This
AD results from reports of uncommanded horizontal stabilizer trim
motion. We are issuing this AD to ensure that the flightcrew is
advised of appropriate procedures to follow in the event of
stabilizer trim runaway. Failure to follow these procedures could
result in excessive uncommanded movement of the horizontal
stabilizer trim actuator (HSTA) and loss of ability to use trim
switches to override uncommanded movement or yoke disconnect
switches to disconnect the HSTA, which could result in reduction of
or loss of pitch trim control and consequent reduced
controllability of the airplane.
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