AD 2023-05-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Degraded performance of the oxygen sensor could result in the system failing to detect when the air separation module (ASM) performance degrades below the acceptable threshold for nitrogen-enriched air, leading to the fuel tank becoming more flammable due to receiving poor-quality nitrogen-enriched air.
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Required Actions
Revise the existing maintenance or inspection program to incorporate new airworthiness limitations for periodic replacement, or testing and replacement if necessary, of the oxygen sensor of the nitrogen generation system (NGS).
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Compliance Time
Within 12 months of the effective date of the AD.
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Affected Aircraft
The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes having original airworthiness certificate or original export certificate of airworthiness issued on or before April 1, 2021, and with a line number specified in paragraph (c)(2) of the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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