Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed 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; Thrust reverser; 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. * * * * *
The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.