Airworthiness directives › 2020-12-13
AD 2020-12-13 Airworthiness Directives; Bombardier, Inc., Airplanes
Applicability*9
This AD applies to Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial number 7003 and subsequent.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes on which Bombardier Service Bulletin 601R-57-044 has not been done: Within 30 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information in airworthiness limitations (AWL) task 57-21-112, as specified in Part 6—Eddy Current, of Bombardier Canadair Regional Jet CRJ200 Nondestructive Testing Manual, CSP A-010, Revision 40, dated November 10, 2018. The initial compliance time for doing the task is at the next scheduled inspection as specified in AWL task 57-21-112, or within 30 days after the effective date of this AD, whichever occurs later.
Unsafe condition
This AD was prompted by reports that during airplane wing fatigue testing, fatigue cracks were found on the lower right-hand-side wing plank at the end of the integrally machined stringers, which led to a determination that new or more restrictive airworthiness limitations are necessary. The FAA is issuing this AD to address undetected cracks on the lower wing plank at the stringer run-out, which could affect the structural integrity of the wing.
Affected ADs
This AD affects AD 2016-17-15, Amendment 39-18628 (81 FR 59839, August 31, 2016) (“AD 2016-17-15”).
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