EASA Regulations for Sikorsky S-76C

9 airworthiness directives and regulations affecting Sikorsky S-76C.

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New ADs and bulletins for Sikorsky S-76C, summarized like the ones below, every Monday.

EASA AD 2026-0153

Jul 31, 2026

Time Limits / Maintenance Checks – Airworthiness Limitations Section – Amendment

EASA Airworthiness Directive 2026-0153 is an amendment addressing time limits and maintenance checks in the Airworthiness Limitations Section for SAFRAN HELICOPTER ENGINES ARRIEL 2 series engines. This directive applies to multiple ARRIEL 2 engine models installed on various helicopters including Airbus Helicopters AS 350 B3 (H125), EC 130 T2 (H130), MBB-BK117 D-2 (EC 145 T2 or H145), Sikorsky S-76C, Korea Aerospace Industries LAH and LCH, and AVIC AC312E helicopters. It mandates compliance with updated maintenance manuals and overhaul manuals to ensure continued airworthiness.

Airworthiness Directive
  • Safran ARRIEL 2
  • Airbus Helicopters AS 350 B3
  • Airbus Helicopters EC 130 T2
  • MBB-BK117 D-2
  • Sikorsky S-76C
  • Korea Aerospace Industries LAH
  • Korea Aerospace Industries LCH
  • AVIC AC312E

EASA AD US-2020-15-17

Sep 3, 2020

Indicating / Recording System - Remote Data Acquisition and Display Units - Software Update

The Federal Aviation Administration's Airworthiness Directive 2020-15-17 addresses certain Sikorsky Aircraft Corporation Model S-76C helicopters equipped with specific remote data acquisition units (RDAU) part numbers 76450-01098-106, 76450-01098-107, or 76450-01098-109. This directive mandates software updates to the RDAU and, for some helicopters, the display unit (DU) software to correct inaccurate main gear box (MGB) indications during flight. The directive aims to enhance flight safety by ensuring accurate MGB data is displayed to flight crews.

Airworthiness Directive
  • Sikorsky S-76
  • Sikorsky S-76C

EASA AD 2020-0046

Mar 4, 2020

Engine Fuel & Control — Full Authority Digital Engine Control B / Digital Engine Control Unit — Inspection / Replacement

EASA Airworthiness Directive 2020-0046 is an airworthiness directive addressing SAFRAN Helicopter Engines ARRIEL 2C and 2S1 engines, commonly installed on Airbus Helicopters AS 365 N3 and Sikorsky S-76C helicopters. The directive focuses on inspection and replacement of Full Authority Digital Engine Control B (FADEC B) digital engine control units (DECUs) due to identified defects. It mandates replacement of affected FADEC B DECU units to ensure continued safe operation of the engines.

Airworthiness Directive
  • Safran ARRIEL 2
  • Airbus Helicopters AS 365 N3
  • Sikorsky S-76C

EASA AD US-2019-19-12

Oct 8, 2019

Engine Fuel & Control - Engine Collective Position Transducer - Inspection

Airworthiness Directive 2019-19-12 is a final rule issued by the FAA addressing Sikorsky Aircraft Corporation Model S-76C helicopters equipped with Turbomeca Arriel 2S1 or 2S2 engines that have engine collective position transducers (CPT) part numbers 76900-01821-104 or 76900-01821-105 installed. This directive mandates inspections and potential replacement of the CPT to prevent failure that could lead to engine control issues. It updates and expands upon the previous AD 2018-10-07 by including an additional CPT part number.

Airworthiness Directive
  • Sikorsky S-76
  • Sikorsky S-76C

EASA AD 2019-0180

Jul 25, 2019

Engine Fuel & Control — Fuel Filter Pre-blockage Pressure Switch — Operational Check

EASA Airworthiness Directive 2019-0180 is an airworthiness directive addressing SAFRAN Helicopter Engines ARRIEL 2 series engines installed on various helicopters including Airbus Helicopters AS 350 B3, EC 130 B4, AS 365 N3, EC 155 B, and Sikorsky S-76C. The directive mandates operational checks and visual inspections of the fuel filter pre-blockage pressure switch to ensure proper functionality and prevent uncommanded engine shutdowns due to fuel contamination.

Airworthiness Directive
  • Safran ARRIEL 2
  • Airbus Helicopters AS 350 B3
  • Airbus Helicopters EC 130 B4
  • Airbus Helicopters AS 365 N3
  • Airbus Helicopters EC 155 B
  • Sikorsky S-76C

EASA AD US-2018-10-07

Jun 11, 2018

Superseded by FAA AD 2019-19-12

FAA Airworthiness Directive 2018-10-07 is a final rule addressing Sikorsky Aircraft Corporation Model S-76C helicopters equipped with Turbomeca Arriel 2S1 or 2S2 engines having engine collective position transducer (CPT) part number 76900-01821-104 installed. This directive requires inspections of the CPT to detect wear that has caused several momentary One Engine Inoperative (OEI) incidents. The AD aims to prevent unsafe conditions related to CPT wear that could lead to emergency landings.

Airworthiness Directive
  • Sikorsky S-76
  • Sikorsky S-76C

EASA AD 2007-0117-CN

Jan 24, 2018

CANCELLED: Engines Formerly Used by Non-Civil Operators — Civil Use

EASA Airworthiness Directive Cancellation Notice 2007-0117-CN cancels the previous EASA AD 2007-0117 concerning ARRIEL 2 series engines formerly used by non-civil operators such as military entities. These engines are installed on helicopters including Airbus Helicopters AS 350 B3, AS 365 N3, EC 130 B4, EC 155 B1, and Sikorsky S-76C models. The cancellation reflects a change in regulatory approach regarding the airworthiness of these engines for civil use.

Airworthiness Directive
  • Safran ARRIEL 2
  • Airbus Helicopters AS 350 B3
  • Airbus Helicopters AS 365 N3
  • Airbus Helicopters EC 130 B4
  • Airbus Helicopters EC 155 B1
  • Sikorsky S-76C

EASA AD US-2017-19-01

Dec 15, 2017

Rotorcraft Flight Control - Main Rotor (M/R) Servo Pushrod Assembly - Inspection

Federal Register Volume 82, Number 227, Airworthiness Directive 2017-19-01 is a final rule issued by the FAA addressing Sikorsky Aircraft Corporation Model S-76A, S-76B, S-76C, and S-76D helicopters. It mandates inspection and marking of the main rotor servo pushrod assemblies with specific part numbers to prevent failure. The directive aims to enhance flight safety by addressing a critical component failure risk.

Airworthiness Directive
  • Sikorsky S-76
  • Sikorsky S-76A
  • Sikorsky S-76B
  • Sikorsky S-76C
  • Sikorsky S-76D

EASA SIB 2012-19R1

Jan 9, 2013

Uncommanded Engine In-Flight Shutdown triggered by the Tachometer Box

EASA Safety Information Bulletin SIB No. 2012-19R1 addresses uncommanded engine in-flight shutdowns triggered by the tachometer box on Turboméca ARRIEL 1E2 and ARRIEL 1S1 engines. These engines are installed on Eurocopter Deutschland MBB-BK 117 C-1 and C-2 helicopters, as well as Sikorsky S-76A and S-76C series helicopters. The bulletin provides information on the issue and recommends modifications to improve tachometer box reliability and mitigate shutdown risks.

Safety Information Bulletin
  • Eurocopter Deutschland MBB-BK 117 C-1
  • Eurocopter Deutschland MBB-BK 117 C-2
  • Sikorsky S-76A
  • Sikorsky S-76C