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2026-11-06 Recurring

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Cracked barrel nuts at the wing front spar and horizontal stabilizer to vertical stabilizer joint.

Effective: Jul 9, 2026 Category: aircraft

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of a riveted aircraft structural panel and frame
Problem area Airframe structure

2026-08-07

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Cracks in elevator power control unit (PCU) brackets (fittings) and the elevator front spar.

Effective: Jun 3, 2026 Category: aircraft

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2025-19-05 Recurring

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Failure of an elevator PCU fitting (bracket) or fracture of the front spar into two segments; either structural failure may cause a jam in one elevator or a loss of airplane pitch control if both e...

Effective: Oct 31, 2025 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2025-17-08 Recurring

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Unsafe Condition: a missing stabilizer actuator lock ring, which can cause the stabilizer actuator clamp nut to separate from the stabilizer barrel by unthreading, resulting in a reduction or loss of pitch control d...

Effective: Sep 29, 2025 Category: aircraft Compliance: Within 330 hours time-in-service after the effective date of this AD

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2024-22-07

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Failure of certain fuse/shuttle valves to function properly, which can cause valve deformation leading to premature wear and eventual fuse/shuttle valve failure, resulting in the loss of powered la...

Effective: Dec 31, 2024 Category: aircraft Compliance: Within 8,000 flight hours or 48 months, whichever occurs first after the effective date of the AD.

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft landing gear and wheel assembly
Problem area Landing gear

2024-12-05 Recurring

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Failure of the pivot pin retention bolt, which could result in a loss of directional control or loss of an NLG tire during takeoff or landing, which could lead to runway excursions.

Effective: Aug 21, 2024 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2024-12-06

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Reports of moisture in the wing-to-fuselage joint, between the mating front spar and rear spar frame segments. The condition, if not corrected, could lead to corrosion and structural degradation of...

Effective: Aug 21, 2024 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2024-08-04

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Failure to adhere to the specified interval limitations may result in reduced structural integrity of the airplane.

Effective: Jun 20, 2024 Category: aircraft Compliance: Within 90 work-hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2024-02-02

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: gapping and bending of the saddle washer that could have the potential to reduce the life of the bolt, which in turn could affect the structural integrity of the horizontal stabilizer to vertical s...

Effective: Mar 21, 2024 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2023-22-17

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Unsafe Condition: Cracking of the engine mount pickup fittings can result in failure of the fitting, leading to a loose connection of the engine mount ring and consequent reduced control of the airplane.

Effective: Jan 19, 2024 Category: engine Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Technical illustration of an aircraft turbine engine assembly
Problem area Engine

2023-19-06

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes

Unsafe Condition: Corrosion-related degradation of the aileron mass balance weight arms, which could lead to structural failure and consequent loss of control of the airplane.

Effective: Nov 6, 2023 Category: aircraft Compliance: Within 12 months of the effective date (November 6, 2023).

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2023-18-03

final rule

Airworthiness Directives; Viking Air Limited (Type Certificated Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Unsafe Condition: Corrosion, wear, and fatigue-related degradation in aging aircraft, which could lead to structural failure with consequent loss of control of the airplane.

Effective: Oct 24, 2023 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificated Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

2023-16-05 Recurring

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: possible cam assembly, spring box assembly, and alternate release cable assembly failures, which could result in asymmetric main landing gear configuration at landing, and a runway excursion.

Effective: Sep 25, 2023 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft landing gear and wheel assembly
Problem area Landing gear

2023-07-06

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: corrosion on the horizontal stabilizer lower center skin panel, including a finding of corrosion where the skin thickness had been substantially reduced, affecting design margins

Effective: Jun 20, 2023 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of a riveted aircraft structural panel and frame
Problem area Airframe structure

2023-10-02

final rule

Airworthiness Directives; Transport and Commuter Category Airplanes

Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...

Effective: May 26, 2023 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; Transport and Commuter Category Airplanes

2023-06-03

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: A discrepant sleeve with missing lubrication grooves can result in the fatigue failure of the forward door linkage, leading to possible interference with the extension or retraction of the correspo...

Effective: May 18, 2023 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft landing gear and wheel assembly
Problem area Landing gear

2023-06-11

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes

Unsafe Condition: Damage in the main wing spar caused by drill starts, corrosion, cracks, and improperly installed fasteners.

Effective: Apr 28, 2023 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes

Technical illustration of a riveted aircraft structural panel and frame
Problem area Airframe structure

2023-05-01

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: FPU pressure switch failures resulting in flap inoperative events due to deformation of the FPU pressure switch internal mechanism due to hydraulic pressure spikes.

Effective: Apr 18, 2023 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2023-01-09

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: altered electrical bonding paths, which may lead to lightning strike-induced ignition of the fuel tank

Effective: Mar 13, 2023 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft fuel pump, filter, valve, and lines
Problem area Fuel system

2022-25-06

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: The actual operating temperatures within the integrated flight cabinet (IFC) were significantly higher than anticipated during certification, which could lead to uncontrolled autopilot pitch trim s...

Effective: Jan 23, 2023 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2022-23-01 Recurring

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: Wear on fuel couplings, bonding springs, and sleeves as well as fuel tube end ferrules and fuel component end ferrules, which could reduce the integrity of the electrical bonding paths through the ...

Effective: Dec 13, 2022 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Technical illustration of an aircraft fuel pump, filter, valve, and lines
Problem area Fuel system

2022-21-51 Recurring

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Unsafe Condition: cracks in the left-hand elevator auxiliary spar, if not addressed, could result in elevator flutter leading to elevator failure, with consequent loss of control of the airplane.

Effective: Dec 1, 2022 Category: aircraft Compliance: Within 50 flight hours

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2022-23-08

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.)

Unsafe Condition: A missing or incorrectly seated lock ring in the stabilizer actuator could result in a reduction or loss of pitch control during flight with consequent loss of control of the airplane.

Effective: Nov 2, 2022 Category: aircraft Compliance: Within 10 hours time-in-service

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.)

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

2022-17-04

final rule

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Unsafe Condition: broken P-clamps on the pressure relief line and the motive flow line in the fuel tanks, and a subsequent determination that certain service information lacked instructions for maintaining appropria...

Effective: Nov 1, 2022 Category: aircraft Compliance: Before further flight

Why matched: Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

2022-17-05 Recurring

final rule

Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes

Unsafe Condition: Corrosion of the DHC-2 front fuselage struts and deterioration of the airframe lugs to which the struts are attached, which could result in the loss of airframe structural integrity.

Effective: Sep 30, 2022 Category: aircraft Compliance: Within 15 years since initial installation of the struts.

Why matched: Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland Inc.) Airplanes