Airworthiness directives › 2018-22-11
AD 2018-22-11 Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines
Applicability*9
This AD applies to Safran Helicopter Engines, S.A. (Safran Helicopter Engines), ASTAZOU XIV B and H model engines with the 3rd-stage turbine wheels specified in Figure 1 to paragraph (c) of this AD installed. Figure 1 to Paragraph ( c ) of This AD—3rd-Stage Turbine Wheels Part Nos. Serial Nos. 0 265 25 706 0 AD78691AD, AD78703AD, AD93845AD, CC52860, RD39596 0 265 25 705 0 L232AD
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Perform an inspection of the 3rd-stage turbine wheel as follows: (i) Before exceeding 400 engine cycles since the last engine overhaul, or within 50 engine start stop cycles after the effective date of this AD, whichever occurs later, inspect the rear face of each affected 3rd-stage turbine wheel in accordance with the Accomplishment Instructions, paragraphs 2.4.2 and 2.4.3, in Safran Helicopter Engines Mandatory Service Bulletin (MSB) 283 72 0813, Version A, dated February 26, 2018. (ii) After that, repeat the inspection required by paragraph (g)(1)(i) of this AD at intervals not to exceed 400 engine cycles since the last inspection. (iii) A one-time, non-cumulative tolerance of 50 engine cycles may be applied to the repetitive inspection interval required by paragraph (g)(1)(ii) of this AD. (2) If a crack indication is found during any inspection required by paragraph (g)(1) of this AD, remove the engine from service and repair the 3rd-stage turbine wheel in accordance with the Accomplishment Instructions, paragraph 4.3, in Safran Helicopter Engines MSB 283 72 0813, Version A, dated February 26, 2018.
Unsafe condition
This AD was prompted by a report that six 3rd-stage turbine wheels were returned to service after a repair that could result in exceedance of the allowable vibration threshold during operation. We are issuing this AD to prevent failure of the 3rd-stage turbine wheel. The unsafe condition, if not addressed, could result in loss of engine power and reduced control of the helicopter.
Affected ADs
None.
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