Airworthiness Directive · Amendment 39-22544 · Flight control system
Viking Air Limited (Type Certificated Previously Held by Bombardier Inc. and de Havilland, Inc.) Airplanes
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.
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 results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as corrosion, wear, and fatigue-related degradation in aging aircraft. This AD requires incorporating into the existing maintenance records for your airplane the actions and associated thresholds and intervals, including life limits, specified in a supplemental inspection and corrosion control manual for Model DHC-3 airplanes. This AD also requires completing all the initial tasks identified in this manual and reporting corrosion findings to Viking. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 90 days after the effective date of this AD, incorporate into the existing maintenance records required by 14 CFR 91.417(a)(2) or 135.439(a)(2), as applicable for your airplane, the actions and associated thresholds and intervals, including life limits, specified in Parts 2 and 3 of Viking DHC-3 Otter Supplemental Inspection and Corrosion Control Manual, PSM 1-3-5, Revision IR, dated December 21, 2017 (Viking PSM 1-3-5, Revision IR). Do each initial task within 6 months after the effective date of this AD or at the threshold for each applicable task specified in Part 3 of Viking Product Support Manual PSM 1-3-5, Revision IR, whichever occurs later. Where Viking PSM 1-3-5, Revision IR, specifies contacting Viking regarding a component's alloy and heat treat condition, this AD requires contacting the Manager, International Validation Branch, FAA, Transport Canada, or Viking's Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
Note 1 to paragraph (g)(1): Viking DHC-3 Otter Service Bulletin V3/0010, Revision NC, dated March 19, 2020, contains additional information related to this AD.
(2) After the action required by paragraph (g)(1) of this AD has been done, no alternative actions and associated thresholds and intervals, including life limits, are allowed unless they are approved as specified in paragraph (i) of this AD.
(1) For inspections done after the effective date of this AD, report to Viking any Level 2 or Level 3 corrosion, as specified in Viking PSM 1-3-5, Revision IR, at the times specified in and in accordance with part 3, paragraph 5, of Viking PSM 1-3-5, Revision IR.
(2) For inspections done before the effective date of this AD, within 30 days after the effective date of this AD report to Viking any Level 2 or Level 3 corrosion, as specified in Viking PSM 1-3-5, Revision IR, in accordance with part 3, paragraph 5, of Viking PSM 1-3-5, Revision IR.
