EASA Regulations for De Havilland DHC-8-401

17 airworthiness directives and regulations affecting De Havilland DHC-8-401.

EASA AD CF-2026-06R1

Landing Gear – Main Landing Gear Aft Door Mechanism – Lock Link Apex Pin/Bolt Fracture

Canadian Airworthiness Directive CF-2026-06R1 addresses the fracture risk of the lock link apex pin/bolt in the main landing gear aft door mechanism on De Havilland DHC-8-401 and DHC-8-402 aircraft, serial numbers 4001 and 4003 through 4633. The directive mandates inspections and replacement of specific apex pins and bolts to prevent asymmetric landing gear extension caused by pin or bolt failure. It applies to apex pin P/N 46852-1 and apex bolt NAS6207-17D, requiring installation of a new pin P/N 46857-1.

Jul 16, 2026

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2020-51R2

Nacelles/Pylons — Attachment Pin Corrosion

Canadian Airworthiness Directive CF-2020-51R2 addresses corrosion issues in the attachment pins of nacelles and pylons on De Havilland DHC-8-401 and DHC-8-402 aircraft, specifically serial numbers 4001, 4003 through 4550, and 4583 through 4590. The directive mandates inspections and corrective actions to prevent premature corrosion and potential failure of nacelle to landing gear and wing rear spar attachment pins. This directive updates previous versions to clarify applicability and maintain required protective treatments.

Feb 28, 2024

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2024-01

Landing Gear — Main Landing Gear — Brake Fuse/Shuttle Valve Assembly — Failure Caused by Assembly Error

Canadian Airworthiness Directive CF-2024-01 addresses a failure in the brake fuse/shuttle valve assembly caused by a factory assembly error affecting De Havilland Aircraft of Canada Limited DHC-8-401 and DHC-8-402 aeroplanes, serial numbers 4001, 4003, and subsequent. The directive mandates inspection and possible replacement of affected fuse/shuttle valve assemblies to prevent loss of critical landing gear and braking functions. This AD aims to ensure continued safe operation of the affected aircraft models.

Jan 12, 2024

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2023-22

Landing Gear — Nose Landing Gear and Doors — Loss of Pivot Pin Retention Bolt

Airworthiness Directive CF-2023-22 is issued by Transport Canada and applies to De Havilland Aircraft of Canada Limited model DHC-8-401 and DHC-8-402 aeroplanes, serial numbers 4001 and 4003 through 4633. The directive addresses the loss of the pivot pin retention bolt on the nose landing gear and associated doors, which could lead to loss of directional control or tire rupture during take-off or landing. It mandates specific inspections, replacements, and maintenance actions to ensure continued airworthiness.

Mar 31, 2023

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-59

Maintenance Requirements Manual, Part 2 Airworthiness Limitation Items — Introduction of New Section 7-00 — Candidate Certification Maintenance Requirements Limitations

Maintenance Requirements Manual, Part 2 Airworthiness Limitation Items — Introduction of New Section 7-00 — Candidate Certification Maintenance Requirements Limitations is a Canadian Airworthiness Directive CF-2022-59 issued by Transport Canada. It applies to De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes of all serial numbers. The directive mandates the incorporation of a new section in the Maintenance Requirements Manual that introduces Candidate Certification Maintenance Requirements limitations for continued airworthiness.

Oct 28, 2022

Airworthiness DirectiveMaintenanceDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-29

Landing Gear — Main Landing Gear (MLG) and Doors — Forward Door Linkage Sleeves Missing Greasing Grooves

The Canadian Airworthiness Directive CF-2022-29 addresses an issue with the main landing gear forward door linkage sleeves on De Havilland DHC-8-401 and -402 aircraft, serial numbers 4001, 4003, and subsequent. The directive mandates inspections and corrective actions due to missing greasing grooves on part number 46878-1 sleeves, which could lead to fatigue failure and potential landing gear malfunction. This safety measure aims to prevent asymmetric landing gear configuration and runway excursions.

May 30, 2022

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-21

Stabilizers — Horizontal Stabilizer to Vertical Stabilizer Joint — Non-Conforming Saddle Washer (Radius Filler)

Canadian Airworthiness Directive CF-2022-21 addresses a non-conforming saddle washer (radius filler) issue at the horizontal stabilizer to vertical stabilizer joint on De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4001 and 4003 through 4633. The directive mandates inspection and replacement of affected parts to ensure structural integrity. This AD aims to prevent potential structural degradation caused by improperly manufactured saddle washers.

Apr 25, 2022

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-12

Landing Gear — Lubrication of Main Landing Gear

Canadian Airworthiness Directive CF-2022-12 mandates repetitive lubrication of the main landing gear (MLG) on De Havilland Aircraft of Canada Limited DHC-8-401 and -402 aeroplanes, serial numbers 4001, 4003, and subsequent. This directive addresses issues with MLG lock actuator assemblies that may fail due to grease degradation over time. The directive ensures continued safe operation by requiring maintenance actions in accordance with De Havilland Service Bulletin 84-32-168.

Mar 22, 2022

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-09

Air Conditioning — Avionics Cooling — Integrated Flight Cabinet Failure Due to High Temperatures

Airworthiness Directive CF-2022-09 is issued by Transport Canada and applies to De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4095 through 4633. The directive addresses failures in the Integrated Flight Cabinet (IFC) caused by higher-than-expected operating temperatures affecting avionics cooling. This condition could lead to autopilot pitch trim servo runaway and stall warning system failures, impacting aircraft controllability.

Mar 4, 2022

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2022-02

Stabilizers — Horizontal Stabilizer Lower Centre Skin Panel — Corrosion Damage

Canadian Airworthiness Directive CF-2022-02 addresses corrosion damage on the horizontal stabilizer lower centre skin panel of De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4001 and 4003 through 4549. This directive mandates inspection and corrective actions to ensure structural integrity of the horizontal stabilizer. The directive references specific service bulletins for inspection and repair procedures.

Feb 1, 2022

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2021-12

Fire Protection System — Main Landing Gear Primary Zone Advanced Pneumatic Detector Chafing Damage

Canadian Airworthiness Directive CF-2021-12 addresses fire protection system concerns related to the main landing gear primary zone advanced pneumatic detector chafing damage on De Havilland DHC-8-401 and -402 aircraft, serial numbers 4001 and 4003 through 4614. The directive mandates inspections and repairs to prevent hydraulic leaks and fire detection failures caused by insufficient clearance and chafing between hydraulic tubes and APD sensing lines. This AD ensures continued airworthiness and safety of the affected aircraft models.

Apr 6, 2021

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2021-11

Pneumatic System — Wing Check Valve Bleed Air Leak - Replacement

The Canadian Airworthiness Directive CF-2021-11 addresses a pneumatic system issue involving bleed air leaks at the wing check valve on De Havilland DHC-8-401 and DHC-8-402 aircraft, serial numbers 4001 and 4003 through 4624. This directive mandates replacement of specific V-band clamps and check valve seals to prevent air leaks that could damage aircraft structure and critical components. It applies to affected aircraft operated under Canadian aviation regulations.

Mar 30, 2021

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2021-08

Fuel System — Fuel Terminal — High Level Sensor Terminal Screw in Contact with Access Panel

The Canadian Airworthiness Directive CF-2021-08 addresses a fuel system issue on De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4001 and 4003 through 4628. It identifies a potential contact between the #2 top high level sensor terminal screw and the #6 outer wing fuel access panel stiffener flange that could cause arcing during lightning strikes. This directive mandates corrective actions to eliminate this interference and prevent ignition risks inside the fuel tank.

Mar 16, 2021

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2020-39

Nacelles/Pylons — Main Landing Gear Side Brace Fitting to A-frame Joint — Fastener Holes Not Cold-worked

Canadian Airworthiness Directive CF-2020-39 addresses an issue with the nacelles/pylons on De Havilland Aircraft of Canada Limited DHC-8-400, -401, and -402 aeroplanes, specifically serial numbers 4081 through 4591. The directive focuses on the main landing gear side brace fitting to the A-frame joint where fastener holes were not cold-worked as required. This condition poses a risk of cracking and potential main landing gear collapse.

Oct 15, 2020

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-400De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2020-01

Fuel System — Non-Conforming Installation of Electrical Bonding Jumpers

Canadian Airworthiness Directive CF-2020-01 addresses the non-conforming installation of electrical bonding jumpers on the fuel scavenge and vent lines of De Havilland Aircraft of Canada Limited models DHC-8-400, DHC-8-401, and DHC-8-402, serial numbers 4001, 4003, and subsequent. This directive mandates inspections and corrective actions to remove or modify these jumpers and brackets to prevent potential lightning strike induced fuel tank ignition. It also prohibits certain maintenance procedures that could lead to reinstallation of non-compliant bonding jumpers.

Jan 15, 2020

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-400De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2010-30R2

Cracking of the Nacelle Attachment Fitting(s)

The Canadian Airworthiness Directive CF-2010-30R2 addresses cracking issues in the nacelle attachment fittings of De Havilland Aircraft of Canada Limited model DHC-8-400, -401, and -402 aeroplanes, serial numbers 4001 and subsequent. It mandates inspections and modifications to ensure structural integrity and safe landing operations. The directive applies to specific part numbers of nacelle attachment fittings and outlines inspection and replacement procedures.

Aug 1, 2019

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-400De Havilland DHC-8-401De Havilland DHC-8-402

EASA AD CF-2014-08R1

Doors — Translating Doors Loose Bolts

The Airworthiness Directive CF-2014-08R1 is issued by Transport Canada and applies to De Havilland Aircraft of Canada Limited model DHC-8-400, -401, and -402 aeroplanes with serial numbers 4001 through 4530. It addresses the issue of loose bolts in the translating door crank assemblies, which can prevent emergency exits from opening. This directive mandates inspections and modifications to ensure the secure retention of door crank assembly bolts on emergency and reclassified doors.

Aug 1, 2019

Airworthiness DirectiveMaintenanceSafety MgmtDe Havilland Canada DHC-8De Havilland DHC-8-400De Havilland DHC-8-401De Havilland DHC-8-402