Airworthiness Directive · Amendment 39-18934 · Main rotor system
Airbus Helicopters Deutschland GmbH Helicopters
This AD applies to Airbus Helicopters Model MBB-BK 117 C-2 (including configuration C-2e) and Model MBB-BK 117 D-2 helicopters with a main rotor (M/R) blade vibration absorber spacer part number (P/N) 117-801841.11 installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 C-2 (including configuration C-2e) and MBB-BK 117 D-2 helicopters. This AD requires replacing the main rotor (M/R) blade vibration absorbers. This AD was prompted by a report of strong M/R blade vibrations on a Model MBB-BK 117 C-2 helicopter. The actions of this AD are intended to prevent an unsafe condition on these products.
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 200 hours time-in-service:
(i) Replace each spacer on the vibration absorber with a flanged spacer.
(ii) Re-identify each vibration absorber and M/R blade in accordance with paragraphs 3.B.2.3. or 3.B.2.4, as applicable, of Airbus Helicopters Alert Service Bulletin (ASB) MBB-BK117 C-2-62A-009, Revision 1, dated October 28, 2015, or ASB MBB-BK117 D-2-62A-001, Revision 1, dated October 28, 2015, whichever applies to your model helicopter. Record the new P/Ns and serial numbers for each M/R blade on the component history card or equivalent record.
(2) After replacing the spacer in accordance with paragraph (e)(1) of this AD, do not install M/R blade P/N B621M1002103 or P/N D621M1002101, vibration absorber P/N B621M3001101, or spacer P/N 117-801841.11 on that helicopter. You may install M/R blade P/N B621M1002101 or P/N B621M1002102 provided you have complied with the requirements of paragraph (e)(1) of this AD.
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.
