---
title: "Boeing's warning in 2011 may provide clues to the 2025 UPS cargo plane crash"
description: "Investigators from the National Transportation Safety Board (NTSB) pointed out that a service letter issued by Boeing in 2011 mentioned that the \"spherical bearing seat ring\" of the MD-11 aircraft had"
type: "news"
locale: "en"
url: "https://longbridge.com/en/news/272619075.md"
published_at: "2026-01-15T00:26:54.000Z"
---

# Boeing's warning in 2011 may provide clues to the 2025 UPS cargo plane crash

> Investigators from the National Transportation Safety Board (NTSB) pointed out that a service letter issued by Boeing in 2011 mentioned that the "spherical bearing seat ring" of the MD-11 aircraft had experienced four failures, which may be related to the 2025 UPS cargo plane crash. This component is used to alleviate high loads and vibrations, and the letter recommended incorporating its inspection into routine checks

On January 14, investigators from the National Transportation Safety Board (NTSB) stated that aircraft manufacturer Boeing issued a service letter in February 2011, notifying MD-11 (engine) operators that the "spherical bearing race" had experienced four failures on three different aircraft. The role of this component is to help mitigate high loads and vibrations. The NTSB disclosed this information in a rare update report, which was released between the preliminary investigation report and the final report. The letter from 2011 mentioned that inspections of this component would be included in the routine checks of the MD-11 engine mounting structure

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> **Disclaimer**: This article is for reference only and does not constitute any investment advice.