Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for Agusta AB139 and AW139 helicopters to require replacing certain single- braided flexible hydraulic hoses with double-braided flexible hydraulic hoses. This proposed AD is prompted by occurrences of leaking flexible hydraulic hoses. The proposed actions are intended to prevent loss of hydraulic power and subsequent loss of helicopter control.