EASA Regulations for MBB-BK117

4 airworthiness directives and regulations affecting MBB-BK117.

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New ADs and bulletins for MBB-BK117, summarized like the ones below, every Monday.

EASA AD 2026-0188

Sep 30, 2026

Instruments – Warning Unit Emergency Off Switches – Operational Check

EASA Airworthiness Directive 2026-0188 is issued for Airbus Helicopters Deutschland GmbH EC135, EC635, and MBB-BK117 helicopter models. It addresses potential failures of emergency off switches in the warning units that could lead to engine shutdown or loss of fuel shut-off capability. The directive mandates operational checks and possible replacement of affected warning units to ensure continued airworthiness.

Airworthiness Directive
  • Airbus Helicopters EC135
  • Airbus Helicopters 635
  • Airbus Helicopters MBB-BK 117
  • Airbus Helicopters EC635
  • MBB-BK117

EASA AD 2022-0143

Jul 8, 2022

Integrated Modular Avionics – Ethernet Network – Inspection

EASA Airworthiness Directive 2022-0143 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus Helicopters Deutschland GmbH EC135, EC635, MBB-BK117, Airbus Helicopters EC 175 B, and H160-B helicopters. The directive addresses design deficiencies in the Integrated Modular Avionics Ethernet network that have caused multiple Multi-Function Display failures. It mandates inspections and corrective actions to ensure continued safe operation of these helicopter models.

Airworthiness DirectiveSuperseded
  • Airbus Helicopters EC175
  • Airbus Helicopters H160B
  • Airbus Helicopters EC135
  • Airbus Helicopters 635
  • Airbus Helicopters MBB-BK 117
  • Airbus Helicopters EC635
  • MBB-BK117
  • Airbus Helicopters EC175 B

EASA AD 2022-0097

Jun 1, 2022

Equipment / Furnishings — Instrument Flight Rules Screens — Removal

EASA Airworthiness Directive 2022-0097 is an official regulatory document addressing Airbus Helicopters Deutschland GmbH EC135, EC635, and MBB-BK117 helicopter models. It mandates the removal of specific Instrument Flight Rules (IFR) screens installed on these helicopters to ensure continued airworthiness and flight safety. The directive applies to all variants and serial numbers of the affected helicopter models.

Airworthiness Directive
  • Airbus Helicopters EC135
  • Airbus Helicopters 635
  • Airbus Helicopters MBB-BK 117
  • Airbus Helicopters EC635
  • MBB-BK117

EASA AD 2017-0064R2

Apr 19, 2018

Engine Fuel & Control — Drain Valve Assembly — Inspection / Replacement

{ "summary": "EASA Airworthiness Directive 2017-0064R2 is an updated safety directive addressing fuel leaks from the drain valve assembly on SAFRAN Helicopter Engines ARRIEL 1 series engines, which are installed on various helicopter models including Airbus Helicopters AS 350 and AS 365 series, MBB-BK117, Leonardo A 109 K2, and Sikorsky S-76A. The directive mandates inspections, wrapping, and replacement of affected drain valves to prevent fuel leaks that could lead to engine fire or in-flight

Airworthiness Directive
  • Safran ARRIEL 1
  • Safran Helicopter Engines ARRIEL 1
  • Airbus Helicopters AS 350
  • Airbus Helicopters AS 365
  • MBB-BK117
  • Leonardo A 109 K2
  • Sikorsky S-76A