Airworthiness directives › 2013-16-13
AD 2013-16-13 Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters
Applicability*9
This AD becomes effective September 27, 2013.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: Sharon Miles, Aviation Safety Engineer, Regulations and Policy Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, TX 76137; telephone (817) 222-5110; email sharon.y.miles@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.
Required actions
The subject of this AD is addressed in European Aviation Safety Agency (EASA) AD No. 2008-0206, dated November 25, 2008, and in Transport Canada Civil Aviation (TCCA) AD No. CF-2009-12, dated March 24, 2009. You may view the EASA and the TCCA AD on the Internet at http://www.regulations.gov in Docket No. FAA-2012-0887.
Unsafe condition
Within 100 hours time-in-service (TIS) or 2 months, whichever occurs first, and thereafter at intervals not to exceed 600 hours TIS or 48 months, whichever occurs first: (1) Remove the weights from the lever as depicted in Figure 1 of Eurocopter Alert Service Bulletin (ASB) No. ASB-MBB-BK117-30-113, dated September 23, 2008; ASB No. ASB BO105-30-116, dated September 23, 2008; or ASB No. ASB BO 105 LS 30-12, dated December 12, 2008; as applicable to your model helicopter. Apply marks to the weights before they are removed in order to be able to re-establish the correct assignment and the old installation position towards the lever when the weights are installed. (2) Visually inspect each weight and lever for corrosion and damage in the threaded areas as depicted in Figure 2 of ASB No. ASB-MBB-BK117-30-113, dated September 23, 2008; ASB No. ASB BO105-30-116, dated September 23, 2008; or ASB No. ASB BO 105 LS 30-12, dated December 12, 2008; as applicable to your model helicopter. (i) If there is no corrosion or thread damage on either the weight or lever, before further flight, reinstall the weight by following paragraph (e)(3) of this AD. (ii) If there is corrosion or thread damage on the threaded portion of a weight: (A) If the total area of corrosion or thread damage, or both, covers less than 25 percent of the length of the threaded area, the weight can be threaded (screwed) onto the lever, and the cylindrical mating surface has no damage, before further flight, remove the corrosion and reinstall the weight by following paragraph (e)(3) of this AD. (B) If the total area of corrosion or thread damage, or both, covers 25 percent or more of the length of the threaded area, the weight cannot be threaded (screwed) onto the lever, or the cylindrical mating surface has damage, before further flight, replace the weight with an airworthy weight by following paragraph (e)(3) of this AD. (iii) If there is corrosion or thread damage on the threaded portion of the lever, polish out the corrosion and thread damage using a polishing cloth 600 and: (A) If the thread depth does not exceed 0.3 millimeter (mm) and the diameter of the lever in the area before the threaded area is not less than 9.95 mm after polish out, before further flight, install airworthy weights to the lever by following paragraph (e)(3) of this AD. (B) If the thread depth is 0.3 mm or greater or the diameter of the lever in the area before the threaded area is less than 9.95 mm after polish out, before further flight, replace the lever with an airworthy lever. (3) Apply corrosion preventive paste onto the thread of the lever and install weights to the lever as depicted in Figure 1 of ASB No. ASB-MBB-BK117-30-113, dated September 23, 2008; ASB No. ASB BO105-30-116, dated September 23, 2008; or ASB No. ASB BO 105 LS 30-12, dated December 12, 2008; as applicable to your model helicopter. Ensure during installation of the weights that the weights are correctly assigned and installed to the control lever in accordance with the applied marks.
Affected ADs
This AD defines the unsafe condition as corrosion or thread damage in the threaded area of a lever or weight. This condition could result in failure of a weight or lever, separation of a tail rotor part, severe tail rotor vibration, and subsequent loss of control of the helicopter.
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