Airworthiness directives › 2023-07-06
AD 2023-07-06 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Models named: DHC-8-401, -402. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes, certificated in any category, having serial numbers 4001 and 4003 through 4549 inclusive.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 8,000 flight hours or 48 months, whichever occurs first, after the effective date of this AD: Inspect the horizontal stabilizer lower center skin panel for corrosion in accordance with Section 3.B. Part A of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-05 Revision C, dated August 19, 2021. If any corrosion is found, before further flight, do the applicable actions specified in paragraph (g)(2) or (3) of this AD. (2) If the corrosion is within the allowable repair limits as specified in Figure 5 Detail C of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-05 Revision C, dated August 19, 2021, perform the corrosion rework in accordance with Section 3.B. Part B of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-05 Revision C, dated August 19, 2021. (3) If the corrosion is beyond the allowable repair limits as specified in Figure 5 Detail C of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-05 Revision C, dated August 19, 2021, accomplish the action specified in paragraph (g)(3)(i) or (ii) of this AD. (i) Replace the existing horizontal stabilizer lower center skin panel in accordance with Section 3.B. Procedure of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-11, dated February 16, 2021. (ii) Obtain and follow repair instructions using a method approved by the Manager, New York ACO Branch, FAA; or Transport Canada; or De Havilland Aircraft of Canada Limited's Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
Unsafe condition
This AD was prompted by reports of corrosion on the horizontal stabilizer lower center skin panel, including a finding of corrosion where the skin thickness had been substantially reduced, which affected design margins. The FAA is issuing this AD to address possible substantial reduction of skin panel thickness due to the effects of corrosion, which could compromise the structural integrity of the horizontal stabilizer.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1