Airworthiness directives › 2013-20-51
AD 2013-20-51 Airworthiness Directives; AgustaWestland S.p.A. (Agusta) Helicopters
Applicability*9
This AD is effective October 25, 2013 to all persons except those persons to whom it was made immediately effective by Emergency AD 2013-20-51, issued on October 3, 2013, which contained the requirements of this amendment.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to Gary Roach, Aviation Safety Engineer, Regulations and Policy Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, TX 76137; telephone (817) 222-5110; email gary.b.roach@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
(1) Agusta Alert Bollettino Tecnico (ABT) No. 109K-58, ABT No. 109-136, ABT No. 109EP-130, ABT No. 109L-066, ABT No. 109S-055, ABT No. 109SP-069, and ABT No. 119-061, all dated September 20, 2013, which are not incorporated by reference, contain additional information about the subject of this AD. For service information identified in this AD, contact: Agusta Westland, Customer Support & Services, Via Per Tornavento 15, 21019 Somma Lombardo (VA) Italy, ATTN: Giovanni Cecchelli; telephone 39-0331-711133; fax 39 0331 711180; or at http://www.agustawestland.com/technical-bullettins. You may review a copy of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. (2) The subject of this AD is addressed in European Aviation Safety Agency (EASA) Emergency Airworthiness Directive 2013-0225-E, effective September 21, 2013. You may view the EASA AD at http://www.regulations.gov in Docket No. FAA-2013-0881.
Unsafe condition
(1) Before further flight, using a borescope or light source and mirror, inspect each Thomas coupling nut for a crack. If any Thomas coupling nut is cracked, before further flight, replace all the Thomas coupling nuts with nuts, P/N NAS1805-4, torqueing each nut to 5.6-7.9 Nm. (2) Within 10 hours time-in-service or 30 days, whichever occurs first, replace each Thomas coupling nut, P/N MS21042L4, with a nut, P/N NAS1805-4, torqueing each nut to 5.6-7.9 Nm. (3) After the effective date of this EAD, do not install a nut, P/N MS21042L4, on any Thomas coupling.
Affected ADs
This AD defines the unsafe condition as a production deficiency in a certain Thomas coupling nut. This condition could result in failure of the Thomas coupling, failure of the tail drive shaft, and subsequent loss of control of the helicopter.
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