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ASB EC135H‐67A‐007Valid for Version(s): T3H, P3H, 635 T3H, 635 P3HALERT SERVICE BULLETINPROTECTIVE MEASUREROTOR FLIGHT CONTROL ‐ Main Rotor ActuatorOne‐time visual inspection of the main rotor actuatorRevision No.Date of issueRevision 02018‐11‐28Summary:Airbus Helicopters Deutschland (AHD) was informed about a cracked nut on the piston of a mainrotor actuator (MRA). With this Alert Service Bulletin (ASB), AHD prescribes a fleet‐wideone‐time visual inspection if necessary.Compliance:Compliance with this ASB is mandatory.Revision 0, 2018‐11‐28PAGE 1 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0071PLANNING INFORMATION1.AEFFECTIVITY1.A.1 Helicopters/installed equipment and parts(a) EC135, T3H, P3H, 635 T3H, 635 P3H, all S/N up to and inluding S/N 2070.(b) Main rotor actuator, all P/N, all S/N.Nut1.A.2 Non‐installed equipment and partsMain rotor actuator P/N L673M20A1005, all S/NMain rotor actuator P/N L673M30A2011, all S/NMain rotor actuator P/N E673M30A2001, all S/N1.BLongitudinal axisLongitudinal axisP/N L673M20A1008, all S/NP/N L673M30A2111, all S/NCollective axisCollective axisCollective axisP/N L673M20A1012, all S/NP/N L673M30A1211, all S/NP/N E673M30A1201, all S/NLateral axisLateral axisP/N L673M20A1011, all S/NP/N L673M30A2311, all S/NASSOCIATED REQUIREMENTSNot applicable.PAGE 2 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0071.CREASONAHD was informed of increased control forces in the collective axis in flight. The postflight inspection revealed that a nut on the piston of the MRA had cracked and wasdisplaced. The cause for the cracking of the nut is still under investigation.As a precautionary measure and analysis of the fleet a one‐time visual inspection ofthe nuts on the pistons of the MRA is introduced with this ASB. Feedback on thecompliance of this ASB is required.1.DDESCRIPTIONVisual inspection of the nuts on the pistons of the MRA for cracks, damage, blackcoloring and corrosion.Revision 0, 2018‐11‐28PAGE 3 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0071.ECOMPLIANCE1.E.1Compliance at H/C manufacturer levelHelicopters/installed equipment and parts:Not affected.Non‐installed equipment and parts:Inspect MRA with more than 0 Fh (TSN/TSO) in accordance with Section 3.B.2 beforedelivery but within the next 3 months after receipt of this ASB at the latest.1.E.2Compliance in serviceHelicopters/installed equipment and parts:Inspect the MRA in accordance with Section 3.B within the next 50 Fh or 3 monthswhichever occurs first after receipt of this ASB.In case of findings (Nuts ‐ NOT OK) report to AHD and wait for feedback from AHDbefore the next flight with the affected MRA.Non‐installed equipment and parts:Inspect MRA with more than 0 Fh (TSN/TSO) in accordance with Section 3.B.2 beforeinstallation in the helicopter but within the next 3 months after receipt of this ASB atthe latest.1.FAPPROVALApproval of this document:The technical content of this document is approved under the authority ofDOA No. ectricianPilotOthersEstimatedMan‐hoursapprox. 1 h‐‐‐WEIGHT AND BALANCENot applicable.1.IPOWER CONSUMPTIONNot applicable.1.JSOFTWARE UPGRADES/UPDATESNot applicable.PAGE 4 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0071.KREFERENCESAMM EC135, AMM EC135/6351.LOTHER AFFECTED PUBLICATIONSPublications already updated:Not applicable.Publications to be updated:Not applicable.1.MINTERCHANGEABILITY OR MIXABILITY OF PARTSInterchangeability:Not affected.Mixability:Not affected.Revision 0, 2018‐11‐28PAGE 5 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0072MATERIAL INFORMATION2.AMATERIAL: PRICE ‐ AVAILABILITY ‐ PROCUREMENTNone.2.BLOGISTIC INFORMATIONNone.2.CMATERIAL REQUIRED PER HELICOPTER/COMPONENTNone.2.DMATERIAL TO BE RETURNEDNone.PAGE 6 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0073ACCOMPLISHMENT INSTRUCTIONS3.AGENERALNot applicable.3.BWORK STEPS3.B.1 Preliminary steps1. De‐energize the helicopter electrical system (AMM 24‐00‐00, 2‐1).2. Affix a placard in the cockpit which says that the controls must not be moved.3. Remove the transmission fairing (AMM 71‐11‐00, 4‐4).3.B.2 ProcedureNOTEThe visual inspection requires a flashlight and a mirror. The nutsmust not be removed for the inspection.1. Visual inspect the nuts (1, Fig. 1) on the pistons of the MRA (2) for cracks,damage, black coloration and corrosion (for condition refer to Figure 2):a. If there are no findings, report to AHD with the reply form sheet 4.1 in theappendix to [email protected] and proceed with Section 3.B.3.b. If there are findings, take a photo of the affected nut and of the MRA andreport to AHD with the reply form sheet 4.2 in the appendix [email protected] Wait for feedback from AHD before thenext flight with the affected MRA.Revision 0, 2018‐11‐28PAGE 7 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐007VIEW AABDETAIL B21X31 Nut2 Main rotor actuatorVisual inspection MRAFigure 1PAGE 8 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐007Used Nut ‐ OKNew Nut ‐ OKslight dark colorationUsed Nut ‐ NOT OKblack coloration and corrosionNOTE: Other shape and form of the nut depending on manufacturer is possible.Conditions of nutFigure 2Revision 0, 2018‐11‐28PAGE 9 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐0073.B.3 Final steps1. Install the transmission fairing (AMM 71‐11‐00, 4‐4).2. Remove the placard in the cockpit.3.CCOMPLIANCE CONFIRMATIONCompliance with this document:Confirm accomplishment of this ASB by an entry in the historical record of thehelicopter and in the log card of the MRA.3.DOPERATING AND MAINTENANCE INSTRUCTIONSOperating instructions:None.Maintenance instructions:None.4APPENDIX4.AReply form sheets:4.A.1 Reply form sheet 4.1 “NO FINDINGS”4.A.2 Reply form sheet 4.2 “FINDINGS”PAGE 10 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐007Reply form sheet for ASB “Inspection of MRA”4.1NO FINDINGSNuts ‐ OKAddress of operator:Helicopter S/N:Helicopter Flight hours (Fh):Main rotor actuator S/N:Send the filled out reply form sheet to:Airbus Helicopters Deutschland GmbHCustomer Supporte‐mail: [email protected]: ‐‐‐‐‐‐‐‐OR REPLY VIA QR ‐‐‐‐‐‐‐‐‐‐‐‐‐Revision 0, 2018‐11‐28PAGE 11 of 12This document is available on the internet: www.airbushelicopters.com/techpub/

ASB EC135H‐67A‐007Reply form sheet for ASB “Inspection of MRA”4.2FINDINGSNuts ‐ NOT OKDescription:Photo of nut and MRA attached:Address of operator:Helicopter S/N:Helicopter Flight hours (Fh):Main rotor actuator S/N:Longitudinal axis S/N:TSN/TSO:Lateral axis S/N:TSN/TSO:Collective axis S/N:TSN/TSO:Environmental conditions in which the helicopter is operated:SaltyDesertUrbanMountainOthers:Send the filled out reply form sheet to:Airbus Helicopters Deutschland GmbHCustomer Support: e‐mail: [email protected]: ‐‐‐‐‐‐‐‐OR REPLY VIA QR ‐‐‐‐‐‐‐‐‐‐‐‐‐PAGE 12 of 12Revision 0, 2018‐11‐28This document is available on the internet: www.airbushelicopters.com/techpub/

Collective axis P/N L673M20A1012, all S/N Collective axis P/N L673M30A1211, all S/N Collective axis P/N E673M30A1201, all S/N Lateral axis P/N L673M20A1011, all S/N Lateral axis P/N L673M30