Airworthiness Directive · Amendment 39-18697 · Electrical power system
Airbus Helicopters Deutschland GmbH Helicopters
This AD applies to Model MBB-BK 117 C-2 helicopters, certificated in any category, with a serial number as listed in the Planning Information, paragraph 1.A.1, of Airbus Helicopters Alert Service Bulletin ASB MBB-BK117 C-2-24A-013, Revision 1, dated November 25, 2014 (ASB).
We are adopting a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 C-2 helicopters. This AD requires inspecting each terminal lug and replacing any lug that has discoloration, corrosion, incorrect crimping, or incorrect installation. This AD was prompted by the discovery that terminal lugs with incorrect crimping may have been installed on these helicopters. The actions of this AD are intended to detect incorrectly installed or crimped terminal lugs and prevent contact resistance and reduced gastightness between the wire and terminal lug, subsequent loss of electrical power, and an electrical fire.
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 100 hours time-in-service or 12 months, whichever occurs first:
(1) Using a mirror, inspect each terminal lug for discoloration and corrosion, and for correct crimping and correct installation in accordance with the Accomplishment Instructions, Table 1, and the examples in Figure 1 through Figure 5 of the ASB.
(2) If a terminal lug is not correctly crimped or installed or if it has any discoloration or corrosion, replace it before further flight.
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.
