Airworthiness directives › 2018-12-03
AD 2018-12-03 Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines
Applicability*9
This AD applies to all Safran Helicopter Engines, S.A., Arrius 2B1 and 2F turboshaft engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For Arrius 2B1 turboshaft engines, do the following: (i) Replace each main fuel injector half-manifold and preferred injector with a part eligible for installation before exceeding the operating hours (hours accumulated by the part since installation on an engine) specified in Figure 1 to paragraph (g) of this AD. (A) For the post-mod TU117 main injector half-manifold, a one-time, non-cumulative tolerance of 100 operating hours may be applied to the compliance interval specified in Figure 1. This one-time tolerance can be applied to the initial replacement or a subsequent replacement, as required. (B) Reserved. ER05JY18.000 (ii) Borescope-inspect (BSI) the flame tube and the high-pressure turbine (HPT) area for turbine distress, when replacing the fuel injector manifolds and preferred injector for the first time. (iii) Thereafter, replace the fuel injector manifolds and preferred injector with a part eligible for installation before exceeding the operating hours (hours accumulated by the part since installation on an engine) specified in Figure 1 to paragraph (g) of this AD. (2) For Arrius 2F turboshaft engines, do the following: (i) Replace each pipe injector preferred assembly, part number (P/N) 0 319 73 835 0 and P/N 0 319 73 044 0, with a part eligible for installation before exceeding 400 operating hours (hours accumulated by the part since installation on an engine). (ii) BSI the flame tube and the HPT area for turbine distress, when replacing the privilege injector for the first time. (iii) Unless already accomplished as required by paragraph (g)(2)(i) of this AD, within 16 months after the effective date of this AD, replace the pipe injector preferred assembly, P/N 0 319 73 835 0, with a part eligible for installation. (iv) Thereafter, replace the pipe injector preferred assembly with a part eligible for installation within 400 operating hours since the last pipe injector preferred assembly replacement.
Unsafe condition
This AD was prompted by several reports of engine flameouts as a result of reduced fuel flow due to the presence of coking. We are issuing this AD to prevent an engine flameout of Arrius 2B1 and 2F turboshaft engines. The unsafe condition, if not addressed, could result in an engine flameout and damage to the helicopter.
Affected ADs
This AD replaces AD 2013-11-09, Amendment 39-17469 (78 FR 32551, May 31, 2013).
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