MANUFACTURER: Bombardier Model CL-600-2B19
(Regional Jet Series 100 & 440) Airplanes SUBJECT: Airworthiness Directive 2009-23-02
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 the Acceptance Test Procedure (ATP) of returned Inboard Flap
Actuators an excessive wear condition was identified
regarding endplay between the flap actuator and ball screw.
Excessive wear of and ball nut could potentially lead to a flap
The unsafe condition is a flap system jam, which could result in
a skewed flap condition with consequent reduced controllability of
the airplane. We are issuing this AD to require actions to correct
the unsafe condition on these products.