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:
During fatigue testing of the MLG [main landing gear], three failures of the retraction bracket occurred before the calculated life limitation. Further analysis has confirmed that those failures were due to fatigue initiated by fretting between the bush and lug bore.
The failure of the retraction bracket, if not detected, could lead to a MLG extension with no damping resulting in MLG structural damage.
* * * * *
The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.