# 2025-20951: Boeing Mechanics Installed Plane Brakes Backwards, Whoops

2025-20951, Airworthiness Directives; The Boeing Company Airplanes, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2025-11-25, effective 2025-12-10 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2025-20951
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-20951
- Title: Airworthiness Directives; The Boeing Company Airplanes
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 90 FR 53215
- Published: 2025-11-25
- Effective: 2025-12-10
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 2120-AA64
- Last updated: 2026-06-11

## In one line

Boeing Mechanics Installed Plane Brakes Backwards, Whoops

## Summary

The FAA is making sure certain Boeing 737 planes get a quick check to fix brake problems that could cause accidents. Starting December 10, 2025, airlines must inspect and test the landing gear brake hoses and sensors to keep flights safe. This fix helps avoid costly crashes and keeps passengers secure, with comments open until January 9, 2026.

## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-700, -800, -900, and -900ER series airplanes. This AD was prompted by a report of a runway excursion caused by loss of braking. An inspection found that the right main landing gear (MLG) hydraulic hoses for the brakes were incorrectly installed at the flow limiters, and the left MLG wheel speed transducer wires were also interchanged. This AD requires a general visual inspection (GVI) of the left and right MLG brake hydraulic hoses for any crossed installation, antiskid valve and transducer operational tests, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.

## Effects PRIA read

- Required inspections and tests for Boeing 737s: cost, high. If you operate Boeing Model 737-700, -800, -900, or -900ER airplanes, you must do a general visual inspection of left and right main landing gear brake hydraulic hoses and perform antiskid valve and transducer operational tests per Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14…
- Estimated compliance and reporting costs: cost, medium. The FAA estimates the inspection and tests cost 7 work-hours at $85 per hour = $595 per airplane. The FAA expects about 100 U.S.-registered airplanes will need immediate action for an estimated total cost to U.S. operators of $59,500; on-condition installation is estimated at 2 work-hours ($170) an…
- Action prevents runway excursion risk: benefit, high. The AD targets incorrectly installed (crossed) brake hydraulic hoses and interchanged left main landing gear wheel speed transducer wires that the FAA says could cause incorrect antiskid operation and loss of braking, possibly leading to a runway excursion with serious or fatal injuries. The AD req…

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## Sources
- [2025-20951 on federalregister.gov](https://www.federalregister.gov/documents/2025/11/25/2025-20951/airworthiness-directives-the-boeing-company-airplanes)
- [2025-20951 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-11-25/pdf/2025-20951.pdf)

## Related
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- [Next: 2025-21001, Protecting Against National Security Threats to the Communications Supply Chain…](https://policyrisk.com/federal-register/2025-21001)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2025-20951 (as of 2026-06-11).