AD 2021-11-24
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The potential for ignition sources inside the fuel tanks and increasing the flammability exposure of the center fuel tank caused by latent failures, alterations, repairs, or maintenance actions, which could result in a fuel tank explosion and consequent loss of an airplane. Additionally, the potential loss of engine fuel suction feed capability, which could result in dual engine flameouts, inability to restart engines, and consequent forced landing of the airplane.
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Required Actions
Revising the existing maintenance or inspection program, as applicable, to incorporate the April 2019 or November 2020 revision of the airworthiness limitations document. Operators must update their maintenance/inspection program to incorporate Boeing D626A001-9-04, dated April 2019; or Boeing D626A001-9-04, dated November 2020. The initial compliance time for replacement of the oxygen sensor due to a parts availability issue has been extended from 12 months to 36 months. Operators may optionally incorporate Boeing D626A001-9-04, dated November 2020, which includes an off-wing inspection as specified in AWL No. 47-AWL-10.
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Compliance Time
Within 36 months after the effective date of this AD
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Affected Aircraft
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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