Airworthiness directives › 2012-07-09
AD 2012-07-09 Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
Applicability*9
This AD applies to Turbomeca S.A. Arrius 2F turboshaft engines with right-hand (RH) rear half-wall, part number (P/N) 0319 99 824 0, installed.
Compliance
For the purpose of this AD, parts eligible for installation is defined as: (1) An undamaged P3 air pipe (first section). (2) An undamaged RH rear half-wall P/N 0 319 99 824 0. (3) A new design RH rear half-wall P/N 0 319 99 008 0.
Required actions
An inspection performed on an installed engine before the effective date of this AD using Turbomeca MSB No. 319 75 4810, Version A, dated May 14, 2008, satisfies the inspection requirement in paragraphs (e)(1)(i) and (e)(1)(ii) of this AD.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) For installed engines, within 100 engine hours (EH) after the effective date of this AD: (i) Inspect the clearance between the P3 air pipe (first section) and the RH rear half-wall for sufficient clearance (0.5 mm or more). (ii) Use paragraph 2.B.(1) of Turbomeca Mandatory Service Bulletin (MSB) No. 319 75 4810, Version B, dated January 25, 2011 to do the inspection. (2) Thereafter, repeat the inspections in paragraphs (e)(1)(i) through (e)(1)(ii) of this AD as follows: (i) At every installation of a RH rear half-wall P/N 0 319 99 824 0 on an installed engine, and (ii) After every installation or reinstallation of an engine with a RH rear half-wall P/N 0 319 99 824 0 installed. (3) If the P3 air pipe (first section) or the RH rear half-wall P/N 0 319 99 824 0 is found damaged, then before further flight, replace the damaged part(s) with parts eligible for installation. (4) If the P3 air pipe (first section) and the RH rear half-wall P/N 0 319 99 824 0 are found contacting each other but are not damaged, replace the RH rear half-wall with a RH rear half-wall eligible for installation. (5) If both the P3 air pipe (first section) and the RH rear half-wall are found not damaged during the inspections specified in paragraph (e)(1) or (e)(2) of this AD, and the clearance between them is less than 0.5 mm, but they are not contacting each other, then repeat the inspection in paragraphs (e)(1)(i) and (e)(1)(ii) of this AD within every 100 EH. (6) Installation of RH rear half-wall, P/N 0 319 99 008 0, is terminating action to the inspections required by paragraphs (e)(1), (e)(2), and (e)(5) of this AD. (7) Once a RH rear half-wall, P/N 0 319 99 008 0, is installed on an engine, do not install a RH rear half-wall, P/N 0 319 99 824 0, on that engine.
Affected ADs
This AD supersedes AD 2009-14-11, Amendment 39-15961 (74 FR 34221, July 15, 2009).
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