MANUFACTURER: Bombardier, Inc. Model
BD-100-1A10 (Challenger 300) Airplanes SUBJECT: Airworthiness Directive AD 2010-07-06
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:
There has been an incident during a production flight test where
the proximity-sensor electronic unit (PSEU) failed. This resulted
in unannunciated loss of:
Wheel brakes below 10 knots;
Nose wheel steering; and
Auto-deployment of the multi-function spoilers.
A similar condition, if not corrected, may result in reduced
controllability of the aircraft upon landing and possible overrun
of the runway.