AD NUMBER: 2015-02-21

PRODUCT: Agusta AB139 and AW139 helicopters to require replacing certain single-braided flexible hydraulic hoses with double-braided flexible hydraulic hoses.

ACTION: Final Rule

SUMMARY:  This AD was prompted by occurrences of leaking flexible hydraulic hoses.

On July 16, 2014, at 79 FR 41464, the Federal Register published our notice of proposed rulemaking (NPRM), which proposed to amend 14 CFR part 39 by adding an AD that would apply to Agusta Model AB139 and AW139 helicopters with a flexible hydraulic hose, part number (P/N) A494AE2E00E0670X, A494AE3E00E0424X, A494AE3E00E0530X, A494AE3E00E0570X, A494AE3E00E0580X, A494AE3E00E0620X, A494AE3E00E0930X, A494AE6E14E0348X, or A494AE6E21E0330X, installed. The NPRM proposed to require replacing these single-braided flexible hydraulic hoses with double-braided flexible hydraulic hoses. The proposed requirements were intended to prevent loss of hydraulic power and subsequent loss of helicopter control.

The actions of this AD are intended to prevent loss of hydraulic power and subsequent loss of helicopter control.

DATES: This AD is effective March 17, 2015.

FMI: AD