Airworthiness Directive · Amendment 39-18089 · Hydraulic system, main
Agusta S.p.A. (Type Certificate Currently Held by AgustaWestland S.p.A.) (Agusta) Helicopters
This AD applies 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, certificated in any category.
We are adopting 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 AD was prompted by occurrences of leaking flexible hydraulic hoses. The actions of this AD are intended to prevent loss of hydraulic power and subsequent loss of helicopter control.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 300 hours time-in-service, replace each flexible hydraulic hose with a double braided flexible hydraulic hose in accordance with the Compliance Instructions, Part I, paragraphs 5 through 7; Part II, paragraphs 5 through 7; Part III, paragraphs 5 through 6; Part IV, paragraphs 5 through 6; and Part V, paragraphs 5 through 7; as applicable for your helicopter serial number and configuration, of AgustaWestland Bolletino Tecnico No. 139-307, dated June 19, 2013.
(2) Do not install a flexible hydraulic hose, P/N A494AE2E00E0670X, A494AE3E00E0424X, A494AE3E00E0530X, A494AE3E00E0570X, A494AE3E00E0580X, A494AE3E00E0620X, A494AE3E00E0930X, A494AE6E14E0348X, or A494AE6E21E0330X, on any helicopter.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
