# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2025-01-10 · Effective 2025-02-14 · 90 FR 1850
## Document
- **Document number:** 2025-00371
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 90 FR 1850
- **Publication date:** 2025-01-10
- **Effective date:** 2025-02-14
- **FAA docket:** Docket No. FAA-2024-0762
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757 airplanes. This AD was prompted by reports of several occurrences of a power transfer unit (PTU) control valve that failed to open when commanded. This AD requires installing new relays and changing certain wire bundles leading to the PTU control valve. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/01/10/2025-00371/airworthiness-directives-the-boeing-company-airplanes)
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