Airworthiness directives › 2021-10-07
AD 2021-10-07 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-8, 737-9. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-8 and 737-9 airplanes, certificated in any category, with an original airworthiness certificate or original export certificate of airworthiness issued before November 20, 2020.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 30 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the CMR item information identified in figure 1 to paragraph (g) of this AD. For airplanes that have exceeded the CMR interval, in total flight hours (FHs), for a required CMR item, the associated task must be done before further flight after revision of the maintenance or inspection program. ER23JN21.020 Note 1 to paragraph (g): The CMR tasks and intervals specified in figure 1 to paragraph (g) of this AD correspond to the items identified in Boeing Certification Maintenance Requirements Document D626A011-9-03, dated July 2020. The information in both sources is identical.
Unsafe condition
This AD was prompted by a determination that additional Certification Maintenance Requirements (CMRs) are necessary. The FAA is issuing this AD to ensure the availability of certain flight control system functions through maintenance tests to verify that the functions have not failed; a potential latent failure of a flight control system function, as tested by these three CMR items, if combined with unusual flight maneuvers or with another flight control system failure, could result in reduced controllability of the airplane.
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