EASA Regulations for Bell 427

6 airworthiness directives and regulations affecting Bell 427.

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New ADs and bulletins for Bell 427, summarized like the ones below, every Monday.

EASA AD CF-2025-21R1

Nov 24, 2025

Main Rotor — Expandable Blade Bolt incorrect heat treatment

Canadian Airworthiness Directive CF-2025-21R1 addresses an issue with expandable blade bolts, part number 406-310-103-103, installed on Bell Textron Canada Limited model 407 and 427 helicopters. The directive identifies that some bolts may have incorrect heat treatment, which could lead to stress corrosion cracking and potential main rotor blade detachment. This directive mandates inspection and replacement of affected bolts to ensure continued airworthiness.

Airworthiness Directive
  • Bell 407
  • Bell 427

EASA SIB CASA-2025-09

Jul 14, 2025

Pilot Cyclic Stick Tube Cracking

Transport Canada Civil Aviation Safety Alert CASA 2025-09 is a safety alert addressing pilot cyclic stick tube cracking on Bell Textron Canada Limited model 206, 407, and 427 helicopters. The alert highlights reports of fatigue cracks in the pilot cyclic stick tube, particularly part number 206-001-342-101, with a focus on the Bell 407 model where excessive force during control checks causes stress fractures. The document informs operators and maintainers about the issue and references Bell Alert Service Bulletins for inspection and corrective actions.

Safety Information Bulletin
  • Bell 206
  • Bell 427

EASA AD CF-2024-42

Dec 19, 2024

Main Rotor Drive System — Cracking of Transmission Oil Check Valve

Canadian Airworthiness Directive CF-2024-42 addresses cracking issues in the transmission oil check valve part number 209-062-520-001 used on Bell Textron Canada Limited model 427 helicopters, serial numbers 56001 through 56084, 58001, and 58002. The directive mandates inspections, measurements, and eventual replacement of affected check valves to prevent transmission failure. It also prohibits installation of affected parts on these helicopters.

Airworthiness Directive
  • Bell 427

EASA AD CF-2018-16

Jun 18, 2018

Equipment / Furnishings — Seat Belt Comfort Clips Adverse Effect on Occupant Restraint

Canadian Airworthiness Directive CF-2018-16 addresses the safety issue related to seat belt comfort clips installed on Bell Helicopter Textron Canada Limited (BHTCL) models 206, 222, 230, 407, 427, 429, and 430 helicopters. The directive identifies that these comfort clips can interfere with the shoulder harness inertia reel, potentially preventing proper locking and increasing injury risk during emergency landings. It mandates removal of these clips and prohibits their installation to ensure occupant restraint effectiveness.

Airworthiness Directive
  • Bell 206
  • Bell 222
  • Bell 230
  • Bell 407
  • Bell 427
  • Bell 429
  • Bell 430
  • Bell Helicopter Textron Canada Limited 206
  • Bell Helicopter Textron Canada Limited 222
  • Bell Helicopter Textron Canada Limited 230
  • Bell Helicopter Textron Canada Limited 407
  • Bell Helicopter Textron Canada Limited 427
  • Bell Helicopter Textron Canada Limited 429
  • Bell Helicopter Textron Canada Limited 430

EASA SIB SW-15-20

Aug 18, 2015

Helicopters modified by Air Comm Corp. STC - Air Conditioning System Wiring

The FAA Special Airworthiness Information Bulletin SAIB: SW-15-20 provides information regarding potential overheating and melting of connectors in the air conditioning wiring of helicopters modified by Air Comm Corporation Supplemental Type Certificates (STCs). Affected helicopter models include Bell Helicopter 206, Bell 407, Bell 427, Agusta A119, Airbus AS350, Airbus EC120, and Airbus EC130. This bulletin alerts operators to possible wiring issues related to Molex connectors installed per Air Comm STCs.

Safety Information Bulletin
  • Bell 206
  • Bell 407
  • Bell 427
  • Agusta A119
  • Airbus AS350
  • Airbus EC120
  • Airbus EC130

EASA SIB 2007-25

Dec 6, 2010

WITHDRAWN / CANCELLED - TRANSPORT CANADA AD CF-2007-21R1 AND FAA AD 2007-19-53 HAVE BEEN ADOPTED BY EASA

The document titled 'WITHDRAWN / CANCELLED - TRANSPORT CANADA AD CF-2007-21R1 AND FAA AD 2007-19-53 HAVE BEEN ADOPTED BY EASA' is an EASA Safety Information Notice 2007-25 issued on 2007-09-17. It addresses tail rotor blade safety issues on various Bell helicopter models including the 204B, 205 series, 206 series, 206L series, 212, 222 series, 230, 407, 412 series, 427, and 430. The notice references Transport Canada Emergency AD CF-2007-2L1 and FAA Emergency AD 2007-19-53, which require inspections and corrective actions for tail rotor blades with missing balance weight screws.

Safety Information Bulletin
  • Bell 204B
  • Bell 205
  • Bell 206
  • Bell 206L
  • Bell 212
  • Bell 222
  • Bell 230
  • Bell 407
  • Bell 412
  • Bell 427
  • Bell 430