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:
The Maintenance Procedure (MP) 57-607, related to non destructive check of the flap tracks 2 and 5, has been introduced thru revision 4 (01/2009) of section 5-10 of the Recommended Maintenance Schedules chapter of the Aircraft Maintenance Documentation.
After the implementation of this MP cracks have been detected in service. * * * * * Cracking of the flap tracks could lead to flap asymmetry and loss of control of the airplane. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.