AD NUMBER: 2011-01-10

MANUFACTURER: Bombardier, Inc. Model BD-700-1A10 and BD-700-1A11 Airplanes
SUBJECT: Airworthiness Directive 2011-01-10

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 have been two in-service reports of main landing gear (MLG) tire failure on landing, during which a flailing tire tread caused damage to No. 2 and No. 3 hydraulic system lines in the wing auxiliary spar area on the left side of the aircraft. This damage resulted in the loss of supply pressure to the inboard and outboard brakes, as the only remaining braking source available was the No. 3 hydraulic system accumulator. The degradation of the brake system performance could adversely affect the aircraft during landing.

The unsafe condition is loss of braking capability, which could reduce the ability of the flightcrew to safely land the airplane.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/188508E1A1CF1A258625780F00549668?OpenDocument