Airworthiness Directive · Amendment 39-19307 · Fuel controlling system
Safran Helicopter Engines, S.A., Turboshaft Engines
This AD applies to all Safran Helicopter Engines, S.A., Arrius 2B1 and 2F turboshaft engines.
We are superseding Airworthiness Directive (AD) 2013-11-09 for all Safran Helicopter Engines, S.A., Arrius 2B1 and 2F turboshaft engines. AD 2013-11-09 required the repetitive replacement of the fuel injector manifolds and privilege injector, or only the privilege injector. This AD retains the repetitive hardware replacement requirements of AD 2013-11-09, but only allows replacement pipe injector preferred assembly, part number (P/N) 0 319 73 044 0, on the Arrius 2F engines. This AD was prompted by reports of engine flameouts as a result of reduced fuel flow due to the presence of coking. We are issuing this AD to address the unsafe condition on these products.
(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.
(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.
(1) For Arrius 2B1 turboshaft engines, a main fuel injector half-manifold or preferred injector is eligible for installation if it has not exceeded the operating hours specified in Figure 1 to paragraph (g) of this AD since first installation on an engine or since last cleaning.
(2) For Arrius 2F turboshaft engines, a pipe injector preferred assembly, P/N 0 319 73 044 0, is eligible for installation if it has not exceeded 400 operating hours since first installation on an engine or since last cleaning.
(1) For Arrius 2B1 turboshaft engines, after the effective date of this AD, do not install a main fuel injector half-manifold or preferred injector onto any engine, or any engine onto a helicopter, unless the main fuel injector half-manifold and preferred injector are eligible for installation.
(2) For Arrius 2F turboshaft engines, after the effective date of this AD, do not install a pipe injector preferred assembly onto any engine, or any engine onto a helicopter, unless the pipe injector preferred assembly is eligible for installation.
(3) For Arrius 2F turboshaft engines, after the effective date of this AD, do not install a pipe injector preferred assembly, P/N 0 319 73 835 0, onto any engine.
