Airworthiness Directive · Amendment 39-17648 · Communications system wiring
Agusta S.p.A. (Type Certificate Currently Held by Agusta Westland) Helicopters
This AD applies to Agusta S.p.A. Model AW139 helicopters, serial numbers 31248, 31249, 41001 through 41023, 41201 through 41234, 41236, 41237 through 41255 (except 41240, 41242, 41246, 41249, 41251, and 41252), and 41257, certificated in any category.
We are adopting a new airworthiness directive (AD) for certain Agusta S.p.A. (Agusta) Model AW139 helicopters. This AD requires replacing certain solder splices in the co-pilot audio system. This AD was prompted by the discovery of improper installation of solder splices on the co-pilot audio system causing intermittent noise through the audio system during flight. The actions of this AD are intended to prevent degradation and complete loss of communications between the pilot and co-pilot during flight, impairing the co-pilot's capability to react immediately to operational difficulties, which could lead to subsequent loss of control of the helicopter.
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.
Within 500 hours time-in-service or 5 months, or in the event of an AVIONICS FAULT crew alerting system (CAS) message, whichever occurs first, replace each co-pilot audio panel solder splice listed in Tables 1 and 2 of Agusta Bollettino Tecnico No. 139-249, dated July 13, 2011 (BT), by following the procedures in paragraphs 7.1 through 7.11. and Figures 12, 14, and 15 of the BT.
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.
