Airworthiness directives › 2008-04-03
AD 2008-04-03 Airworthiness Directives; Eurocopter France Model AS-365N2 and N3, SA-365C, C1 and C2, and SA-365N and N1 Helicopters
Models named: AS-365N2, N3, SA-365C, C1, C2, SA-365N, N1. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Model AS-365N2 and N3, SA-365C, C1 and C2, SA-365N and N1 helicopters, certificated in any category. Reason (d) The mandatory continued airworthiness information (MCAI) states: This Emergency Airworthiness Directive is issued following several reports of tightening torque loss detected on the main rotor hub (MRH)-to-main rotor mast bolted attachment. These findings were made on EUROCOPTER-assembled attachments with less than 300 operating hours. Misinterpretation of the assembly documentation used by EUROCOPTER Marignane may have led to the assembly of these attachments with no grease applied to the nut threads, which leads to a reduction in the tightening loads. A loss of tightening torque on the MRH-to-main rotor mast attachment bolt could lead to loss of the main rotor head.
Compliance
Inspect the tightening torque of the MRH to main rotor mast assembly attachment bolts in accordance with paragraph 2.B. of Eurocopter Alert Service Bulletin (ASB) No. 62.00.22, applicable to Model AS-365N2 and N3, and SA365N and N1 helicopters, or ASB No. 65.44, applicable to Model SA-365C, C1, and C2 helicopters, both dated April 10, 2006, unless already done: (1) On or before reaching 300 hours TIS, for helicopters with less than 280 hours time-in-service (TIS); or (2) Within 20 hours TIS, for helicopters with 280 or more hours TIS. Differences Between the FAA AD and the MCAI (f) This AD requires “inspections” rather than “checks” of the tightening torque. It also uses the term “time-in-service” rather than “flying hours”.
Required actions
Inspect the tightening torque of the MRH to main rotor mast assembly attachment bolts in accordance with paragraph 2.B. of Eurocopter Alert Service Bulletin (ASB) No. 62.00.22, applicable to Model AS-365N2 and N3, and SA365N and N1 helicopters, or ASB No. 65.44, applicable to Model SA-365C, C1, and C2 helicopters, both dated April 10, 2006, unless already done: (1) On or before reaching 300 hours TIS, for helicopters with less than 280 hours time-in-service (TIS); or (2) Within 20 hours TIS, for helicopters with 280 or more hours TIS. Differences Between the FAA AD and the MCAI (f) This AD requires “inspections” rather than “checks” of the tightening torque. It also uses the term “time-in-service” rather than “flying hours”.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1