EASA Regulations for Md Helicopters Inc (Mdhi) 500N

9 airworthiness directives and regulations affecting Md Helicopters Inc (Mdhi) 500N.

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New ADs and bulletins for Md Helicopters Inc (Mdhi) 500N, summarized like the ones below, every Monday.

EASA AD US-2026-19-01

Oct 7, 2026

[Correction] Rotorcraft flight control - Torque Tube Assembly and Roller Bearings - Replacement / Inspection

The document titled "[Correction] Rotorcraft flight control - Torque Tube Assembly and Roller Bearings - Replacement / Inspection" is a final rule correction to Airworthiness Directive (AD) 2026-19-01 issued by the Federal Aviation Administration (FAA). It applies to all MD Helicopters, LLC Model 369 series, 500N, and 600N helicopters. The AD mandates repetitive inspections and potential replacement of the torque tube assembly and roller bearings to ensure flight control safety.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 369A
  • Md Helicopters Inc (Mdhi) 369D
  • Md Helicopters Inc (Mdhi) 369E
  • Md Helicopters Inc (Mdhi) 369F
  • Md Helicopters Inc (Mdhi) 369FF
  • Md Helicopters Inc (Mdhi) 369H
  • Md Helicopters Inc (Mdhi) 369HE
  • Md Helicopters Inc (Mdhi) 369HM
  • Md Helicopters Inc (Mdhi) 369HS
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N
  • MD Helicopters 369
  • MD Helicopters 500N
  • MD Helicopters 600N

EASA AD US-2025-17-11

Oct 9, 2025

Rotors Flight Control - Tail Rotor Pedal Support Brackets - Repetitive Inspections

The Federal Register document titled "Rotors Flight Control - Tail Rotor Pedal Support Brackets - Repetitive Inspections" is a final rule airworthiness directive (AD 2025-17-11) issued by the FAA affecting MD Helicopters, LLC models 369 (Army YOH-6A), 369A (Army OH-6A), 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N. This AD addresses multiple reports of cracked tail rotor pedal support brackets by requiring repetitive inspections and, depending on findings, replacement or refinishing of affected brackets. It also prohibits installation of certain magnesium cast tail rotor pedal support brackets to ensure continued airworthiness.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N

EASA AD US-2024-20-07

Nov 29, 2024

Equipment / Furnishings - Emergency Float Kit Activation Handle - Repetitive Inspections / Replacement

The document titled 'Equipment / Furnishings - Emergency Float Kit Activation Handle - Repetitive Inspections / Replacement' is a regulatory directive addressing the maintenance requirements for the emergency float kit activation handle on certain aircraft. It mandates repetitive inspections and replacement procedures to ensure the proper functioning of this critical safety equipment. The directive applies to aircraft equipped with the specified emergency float kit activation handle assemblies.

Airworthiness Directive
  • Airbus Helicopters AS 350
  • Airbus Helicopters EC 130
  • Airbus Helicopters EC 120 B
  • Airbus Helicopters BO 105
  • Airbus Helicopters EC135
  • Airbus Helicopters 635
  • Airbus Helicopters MBB-BK 117
  • Bell 206
  • Bell 407
  • Bell Textron Inc. (Bti) 210
  • Bell Textron Inc. (Bti) 212
  • Bell Textron Inc. (Bti) 412
  • Leonardo S.P.A. Helicopters AB212
  • Leonardo S.P.A. Helicopters AB412
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Robinson R44 (Raven)
  • Robinson R66
  • Sikorsky S-76

EASA AD US-2024-23-06

Nov 20, 2024

Rotorcraft Flight Control - Torque Tube Assembly and Roller Bearings - Inspection

The document titled 'Rotorcraft Flight Control - Torque Tube Assembly and Roller Bearings - Inspection' is a regulatory directive addressing the inspection requirements for torque tube assemblies and roller bearings in rotorcraft flight control systems. It focuses on ensuring the integrity and safety of these critical components to maintain flight control reliability. The directive applies specifically to affected rotorcraft models equipped with the specified torque tube assemblies and roller bearings.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N

EASA AD US-2021-22-11

Dec 16, 2021

Rotors Flight Control - Pilot-to-Copilot Tail Rotor Torque Tube - Inspection / Removal

Federal Register Volume 86, Number 231 (December 6, 2021) - Airworthiness Directive 2021-22-11 is a final rule issued by the FAA addressing certain MD Helicopters Inc. models 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N equipped with pilot-to-copilot tail rotor torque tube part numbers 369H7531-9, -11, or -13. This directive mandates inspections and potential removal of the torque tube due to a reported spiral crack that compromises tail rotor control. The AD aims to ensure continued airworthiness and safety of these helicopter models.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N
  • MD Helicopters 369D
  • MD Helicopters 369E
  • MD Helicopters 369F
  • MD Helicopters 369FF
  • MD Helicopters 369H
  • MD Helicopters 369HE
  • MD Helicopters 369HM
  • MD Helicopters 369HS
  • MD Helicopters 500N
  • MD Helicopters 600N

EASA AD US-2020-18-20

Sep 25, 2020

Main Rotor - Main Rotor Blade Leading Edge Abrasion Strip - Inspection

FAA Airworthiness Directive 2020-18-20 is a final rule addressing certain MD Helicopters Inc. models 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N equipped with specific main rotor blade part numbers fitted with 1.25 inch chord length nickel abrasion strips manufactured or installed by Helicopter Technology Company, LLC. The directive mandates inspections due to reports of abrasion strips detaching in flight, posing a safety risk. It requires tap inspections of the main rotor blade leading edge abrasion strips to detect damage or delamination.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N
  • MD Helicopters 369A
  • MD Helicopters 369D
  • MD Helicopters 369E
  • MD Helicopters 369FF
  • MD Helicopters 369H
  • MD Helicopters 369HE
  • MD Helicopters 369HM
  • MD Helicopters 369HS
  • MD Helicopters 500N
  • MD Helicopters 600N

EASA AD US-2020-11-07

Jun 12, 2020

Main Rotor System - Hub Lead-lag Bolts - Removal

The Federal Aviation Administration's Airworthiness Directive 2020-11-07 addresses MD Helicopters Inc. models 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N. It mandates the removal from service of certain main rotor hub lead-lag bolts, part number 369D21220, that have non-conforming serial numbers due to unauthorized cadmium plating repairs. This directive aims to ensure continued airworthiness and safety of these helicopter models.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N
  • MD Helicopters 369D
  • MD Helicopters 369E
  • MD Helicopters 369FF
  • MD Helicopters 369H
  • MD Helicopters 369HE
  • MD Helicopters 369HM
  • MD Helicopters 369HS
  • MD Helicopters 500N
  • MD Helicopters 600N

EASA AD US-2019-05-04

Apr 3, 2019

Main Rotor - Blades - Inspection

Federal Register Volume 84, Number 49 (March 13, 2019) Final Rule titled 'Main Rotor - Blades - Inspection' issues a new airworthiness directive (AD 2019-05-04) for MD Helicopters, Inc. models 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N. The AD mandates inspections of specific main rotor blades (MRBs) for cracks to address safety concerns. It applies to helicopters equipped with Helicopter Technology Company, LLC MRB part numbers 369A1100, 369D21100, 369D21102, 369D21120, 369D21121, 369D21123, 500P2100, or 500P2300.

Airworthiness Directive
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Md Helicopters Inc (Mdhi) 600N
  • MD Helicopters 369A
  • MD Helicopters 369D
  • MD Helicopters 369E
  • MD Helicopters 369FF
  • MD Helicopters 369H
  • MD Helicopters 369HE
  • MD Helicopters 369HM
  • MD Helicopters 369HS
  • MD Helicopters 500N
  • MD Helicopters 600N

EASA AD CF-2019-01

Jan 10, 2019

Standard Practices — Helicopter External Transport System (HETS—¢) - Unapproved Parts, Inadequate Service Life Limits and Maintenance Requirements

Airworthiness Directive CF-2019-01 is a Canadian regulatory document addressing the Helicopter External Transport System (HETSâ„¢) certified under Transport Canada Supplemental Type Certificate SH98-35 installed on specific helicopter models including Bell 206B, 206L series, 407, Airbus Helicopters AS350 and AS355 series, and MD Helicopter 369 and 500N series. The directive focuses on issues related to unapproved parts, inadequate service life limits, and maintenance requirements for HETSâ„¢ components. It mandates inspections, component removals, and flight manual amendments to ensure continued airworthiness and safety.

Airworthiness Directive
  • Airbus Helicopters AS 350
  • Airbus Helicopters EC 130
  • Airbus Helicopters AS 355
  • Bell 206
  • Bell 407
  • Md Helicopters Inc (Mdhi) 369
  • Md Helicopters Inc (Mdhi) 500N
  • Bell 206B
  • Bell 206L
  • Airbus Helicopters AS350
  • Airbus Helicopters AS355
  • MD Helicopter 369
  • MD Helicopter 500N