Airworthiness Directive · Amendment 39-22375 · Fuel
The Boeing Company Airplanes
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.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes. This AD was prompted by a determination that new airworthiness limitations are necessary to require periodic replacement; or testing, and replacement if necessary; of the oxygen sensor of the nitrogen generation system (NGS). This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate the new airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
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.
After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions (e.g., inspections), intervals, or CDCCLs may be used unless the actions, intervals, and CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (i) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
