Airworthiness directives › 2012-21-13
AD 2012-21-13 Airworthiness Directives; The Boeing Company Airplanes
Applicability*9
This AD applies to The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin MD80-57A243, dated December 20, 2011.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before the accumulation of 19,000 total flight cycles, or within 8,710 flight cycles after the effective date of this AD, whichever occurs later: Do an in-tank eddy current high frequency (ETHF) inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD80-57A243, dated December 20, 2011. If no cracking is found, repeat the inspection thereafter at intervals not to exceed 29,000 flight cycles.
Unsafe condition
This AD was prompted by reports of fatigue cracks found in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000. We are issuing this AD to detect and correct such cracking, which could result in the wing structure not supporting the limit load condition, which could lead to loss of structural integrity of the wing.
Affected ADs
None.
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