Airworthiness Directive · Amendment 39-17777 · Doors
Eurocopter Deutschland GmbH Helicopters
This AD applies to Model MBB-BK 117 C-2 helicopters with a jettisonable main cabin sliding door (door) installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Eurocopter Deutschland GmbH (Eurocopter) Model MBB-BK 117 C-2 helicopters with a jettisonable sliding door (door) installed. This AD requires inspecting the lock release assembly and the middle and upper lever locking bolts of each door, replacing any damaged parts with airworthy parts, and ensuring the door is correctly installed. This AD was prompted by the uncommanded detaching of a door from an MBB-BK 117 C-2 fuselage. The actions of this AD are intended to prevent the in- flight loss of the door, which could damage the helicopter and injure persons on the ground.
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 50 hours time-in-service:
(1) Visually inspect each door lock release assembly for a frayed cable, a stripped thread on a screw joint, pitting on a door guide, release cable, or associated hardware, and for correct installation by following the Accomplishment Instructions, paragraph 3.B.1. (a) through (c), except (c)(1) and (c)(2), of Eurocopter Alert Service Bulletin MBB-BK117 C-2-52A-015, Revision 0, dated April 26, 2011 (ASB).
(i) Replace with an airworthy part any frayed cables, screw joints with stripped threads, or any door guides, release cables, and associated hardware with pitting. Allow for a minimum of one millimeter clearance at each end of the release cables.
(ii) Install the aft cover and aft inner handle.
(2) Inspect each middle lever and upper lever locking bolt for correct installation by following the Accomplishment Instructions, paragraphs 3.B.2 and 3.B.3, of the ASB, except that we do not require you to contact Eurocopter.
(3) If the door cannot be correctly rigged after performing the actions required by paragraph (e)(2) of this AD, inspect all hardware, guides, and door attachment points for misalignment or bent fittings. Replace misaligned or bent parts with airworthy parts before you operate the door in-flight and re-inspect according to the requirements in paragraph (e)(2) 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.
