Airworthiness Directive · Amendment 39-22235 · Elevator structure
Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.)
Superseded. A later AD replaced this one: AD 2025-17-08. Comply with the one in force.
This AD applies to Viking Air Limited (Viking) (type certificate previously held by Bombardier Inc. and de Havilland, Inc.) Model DHC-3 airplanes, all serial numbers, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Viking Air Limited (Viking) (type certificate previously held by Bombardier Inc. and de Havilland, Inc.) Model DHC-3 airplanes. This AD was prompted by a recent investigation of a Viking Model DHC-3 airplane where the lock ring of the stabilizer actuator was found missing. This AD requires a visual inspection of the stabilizer actuator to confirm that the stabilizer actuator lock ring is present, correctly seated in the groove in the upper housing, and engaged in the clamp nut, applicable corrective actions, and application of a torque seal. This AD also requires sending the inspection results to the FAA. The FAA is issuing this AD to address the unsafe condition on these products.
Within 10 hours time-in-service (TIS) after the effective date of this AD, perform a visual inspection of the stabilizer actuator to confirm that the stabilizer actuator lock ring is present, correctly seated in the groove in the upper housing, and engaged in the clamp nut. If the stabilizer actuator lock ring is missing or not correctly installed, before further flight, repair using a method approved by the Manager, New York ACO Branch, FAA, at the address in paragraph (k) of this AD.
Note to paragraph (g): Viking Service Letter DHC3-SL-27-001, dated October 25, 2022, contains information related to this AD.
Before further flight after the inspection required by paragraph (g) of this AD, apply a torque seal to the clamp nut and lock ring.
Within 10 days after the inspection required by paragraph (g) of this AD or within 10 days after the effective date of this AD, whichever occurs later, report the results of the inspection to the FAA at 9-avs-nyaco-cos@faa.gov. Include the airplane serial number, airplane hours TIS, hours TIS since last actuator overhaul (if known), and whether the lock ring was present, missing, or incorrectly installed.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
Appliances and equipment
