Airworthiness directives › 2022-23-08
AD 2022-23-08 Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.)
Models named: DHC-3. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
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. The investigation revealed that the clamp nut that attaches the top eye end and bearing assembly of the horizontal stabilizer actuator to the actuator barrel had unscrewed from the barrel. The investigation also found that the circular wire lock ring, which was designed to prevent the clamp nut from unscrewing, was not present. This condition, if not detected and corrected, could result in a reduction or loss of pitch control during flight with consequent loss of control of the airplane.
Affected ADs
None.
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