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Final ruleTook effect July 16, 2026

Airworthiness Directives; The Boeing Company Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register July 1, 2026. Document 2026-13241. Updated Nov. 9, 2026.

What it does

The FAA is superseding Airworthiness Directive (AD) 2026-04- 05, which applied to all The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes. AD 2026-04-05 required revising the existing airplane flight manual (AFM) to provide the flightcrew with operating procedures (non-normal checklists) if a certain circuit breaker in the standby power control unit (SPCU) trips. Since the FAA issued AD 2026- 04-05, the FAA has determined that additional revisions to the AFM are necessary to address certain environmental control system (ECS) circuit breakers downstream of the SPCU that could also trip. This AD retains the requirements of AD 2026-04-05 and requires revising the existing AFM to provide the flightcrew with operating procedures (non-normal checklists) if certain ECS circuit breakers trip. The FAA is issuing this AD to address the unsafe condition on these products.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

878 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

Since then:

What happens next and when

This AD is effective July 16, 2026.

The agency's dates, word for word.

Document number2026-13241
ActionFinal rule; request for comments.
AgenciesTransportation Department; Federal Aviation Administration
PublishedJuly 1, 2026
Effective dateJuly 16, 2026
Comments closeAug. 17, 2026
Regulation identifier (RIN)2120-AA64
DocketFAA-2026-4660

Source: the Federal Register (public domain). The document in the Federal Register