# Proposed AD FAA-2005-20867: Airbus Model A300 B4-600, B4-600R, and F4-600R Series Airplanes, and Model C4-605R Variant F Airplanes (Collectively Called A300-600 Airplanes)

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-15-05
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 6, 2005, 70 FR 17340
- Comments due: May 6, 2005
- Became: [AD 2005-15-05](https://openairdocs.org/ad/2005-15-05)
- Docket: FAA-2005-20867 (https://www.regulations.gov/docket/FAA-2005-20867, where comments are filed)
- Project: 2004-NM-188-AD
- FR document: 05-6758
- Official PDF: https://openairdocs.org/files/sha256/bc/12/bc12fcdb2620ab6a9f621113b03d7b7c488982425263334ff105fd2ff294166f (from https://www.govinfo.gov/content/pkg/FR-2005-04-06/pdf/05-6758.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/04/06/05-6758/airworthiness-directives-airbus-model-a300-b4-600-b4-600r-and-f4-600r-series-airplanes-and-model
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ACA0A841F7AC422486256FDB006AC88E.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20867

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Model A300-600 airplanes. This proposed AD would require an inspection for evidence of chafing between the hydraulic flexible hose and the ram air turbine (RAT) hub, and related investigative and corrective actions if necessary. This proposed AD is prompted by reports of holes in the RAT hub cover. We are proposing this AD to prevent a hole in the RAT hub cover. A hole in the RAT hub cover could allow water to enter the RAT governing mechanism, freeze during flight, and jam the governing mechanism. In addition, the metal particles that result from chafing between the hydraulic flexible hose and the RAT could mix with the lubricant grease and degrade the governing mechanism. In an emergency, a jammed or degraded RAT could result in its failure to deploy, loss of hydraulic pressure or electrical power to the airplane, and consequent reduced controllability of the airplane.

## Notices in this docket

- Apr 6, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6758, comments due May 6, 2005 (https://www.federalregister.gov/documents/2005/04/06/05-6758/airworthiness-directives-airbus-model-a300-b4-600-b4-600r-and-f4-600r-series-airplanes-and-model)

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