Airworthiness Directive · Amendment 39-17393 · Helicopter vibration analysis
Eurocopter France Helicopters
This AD applies to Model EC130 B4 helicopters with a cabin vibration damper installed, except those modified in accordance with Modification 073565, certificated in any category.
We are adopting a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model EC130 B4 helicopters with a cabin vibration damper installed. This AD requires installing a vibration damper casing assembly on both sides of the helicopter. This AD was prompted by a crack and failure of a cabin vibration damper blade. The actions of this AD are intended to modify the cabin vibration damper assembly to prevent contact with the flight controls in the event of a cabin vibration blade failure, jamming of a flight control, and 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 the next 100 hours time-in-service:
(1) For helicopters that have not been modified in accordance with Modification 073521 or Modification 073525, install a vibration damper casing assembly on both sides of the helicopter by following paragraphs 2.B.2.a and 2.B.5 of the Accomplishment Instructions of Eurocopter Alert Service Bulletin No. 53A008, dated July 19, 2006 (ASB 53A008).
(2) For helicopters that have been modified in accordance with Modification 073521 either at the time of manufacture or pursuant to Eurocopter Service Bulletin (SB) No. 53-006, Revision 1, dated September 30, 2004; or Modification 073525 either at the time of manufacture or pursuant to Eurocopter SB No. 53-007, Revision 1, dated February 19, 2007, install a vibration damper casing assembly on both sides of the helicopter by following paragraphs 2.B.3.a, 2.B.3.b, and 2.B.5 of the Accomplishment Instructions of ASB 53A008.
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.
Aircraft
