MANUFACTURER: Bombardier, Inc. Model CL-600-2B19
(Regional Jet Series 100 & 440) Airplanes SUBJECT: Airworthiness Directive 2010-09-06
SUMMARY: This AD results from mandatory
continuing airworthiness information (MCAI) originated by an
aviation authority of another country to identify and correct an
unsafe condition on an aviation product. The MCAI describes the
unsafe condition as:
During an elevator Power Control Unit (PCU) Centering Functional
Check on two CL-600-2C10 aircraft, sustained oscillations were
discovered when a control rod was disconnected. These sustained
oscillations could render the elevator surface inoperable and cause
subsequent loss of pitch control of the aircraft.
Loss of pitch control could result in reduced controllability of
the airplane. We are issuing this AD to require actions to correct
the unsafe condition on these products.