# Proposed AD 95-NM-26-AD: Boeing Model 757 and 767 Series Airplanes Equipped With Sundstrand Ram Air Turbine (RAT)/Hydraulic Pumps

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 95-18-02
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 1, 1995, 60 FR 21054
- Comments due: June 26, 1995
- Became: [AD 95-18-02](https://openairdocs.org/ad/95-18-02)
- Docket: 95-NM-26-AD
- FR document: 95-10585
- Official PDF: https://openairdocs.org/files/sha256/a5/ec/a5ec1b32ab810ff2d0d8fd9fd770b964ce23222ac8cc67ce9d3d4b101f6c978e (from https://www.govinfo.gov/content/pkg/FR-1995-05-01/pdf/95-10585.pdf)
- Federal Register: https://www.federalregister.gov/documents/1995/05/01/95-10585/airworthiness-directives-boeing-model-757-and-767-series-airplanes-equipped-with-sundstrand-ram-air
- Page: https://openairdocs.org/proposed/95-NM-26-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 757 and 767 series airplanes. This proposal would require replacement of the hydraulic pressure transfer tube of the ram air turbine (RAT) system with a new hose assembly. This proposal is prompted by reports that, during flight tests, the hydraulic pressure transfer tube of the RAT cracked when the RAT was extended on a Model 767 series airplane. The actions specified by the proposed AD are intended to prevent such cracking, which could result in the loss of hydraulic fluid of the center system and the inability of the RAT to pressurize the center system; this situation could lead to loss of all hydraulic system power in the event that power is lost in both engines.

## Notices in this docket

- May 1, 1995: Notice of proposed rulemaking (NPRM). (first notice), FR document 95-10585, comments due Jun 26, 1995 (https://www.federalregister.gov/documents/1995/05/01/95-10585/airworthiness-directives-boeing-model-757-and-767-series-airplanes-equipped-with-sundstrand-ram-air)

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