Airworthiness directives › 2023-05-06
AD 2023-05-06 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-8, 737-9, 737-8200. 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, 737-9, and 737-8200 airplanes, certificated in any category, identified in paragraphs (c)(1) and (2) of this AD. (1) Airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before April 1, 2021. (2) Airplanes with line numbers 7668, 7678, and 7915.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in AWL No. 47-AWL-09, “Nitrogen Generation System—Oxygen Sensor,” of Boeing 737-7/8/8200/9/10 Special Compliance Items/Airworthiness Limitations, D626A011-9-04, dated January 2019; or the information specified in AWL No. 47-AWL-09, “Nitrogen Generation System (NGS)—Oxygen Sensor,” and AWL No. 47-AWL-10, “Nitrogen Generation System (NGS)—Oxygen Sensor Repair,” of Boeing 737-7/8/8200/9/10 Special Compliance Items/Airworthiness Limitations, D626A011-9-04, dated May 2022. The initial compliance time for accomplishing task AWL No. 47-AWL-09 is: Within 18,000 flight hours after the date of issuance of the original airworthiness certificate or the original export certificate of airworthiness, within 18,000 flight hours after the most recent replacement or test was performed as specified in AWL No. 47-AWL-09, or within 12 months after the effective date of this AD, whichever is latest.
Unsafe condition
This AD was prompted by significant changes made to airworthiness limitations (AWLs) related to the nitrogen generation system (NGS). The FAA is issuing this AD to prevent increasing the flammability exposure of the center fuel tank, which together with an ignition source in the fuel tank, could lead to a fuel tank explosion and consequent loss 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