Airworthiness directives › 2022-21-51
AD 2022-21-51 Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes
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 (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
The definition of Levels 1, 2, and 3 corrosion are specified in Advisory Circular 43-4B, Corrosion Control for Aircraft, dated September 11, 2018. You may find this document at drs.faa.gov/search.
Unsafe condition
This AD was prompted by multiple recent reports of cracks in the left-hand elevator auxiliary spar. The FAA's analysis of these reports indicates that immediate AD action is warranted. The FAA is issuing this AD to detect and address cracks, corrosion, and previous repairs to the left-hand elevator auxiliary spar. The unsafe condition, if not addressed, could result in elevator flutter leading to elevator failure, with consequent loss of control of the airplane.
Affected ADs
None.
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