Accession Number:

ADA370702

Title:

U.S. Navy Halon 1211 Replacement Program: Assessment of Aircraft Collateral Damage From Dry Chemical Fire Extinguishing Agents.

Descriptive Note:

Interim rept. 98-99

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1999-11-15

Pagination or Media Count:

72.0

Abstract:

A literature survey and analysis qualitative analysis was performed of the potential collateral damage of typical aircraft materials caused by bicarbonate-based fire extinguishing agents. Very little data were found in the open literature assessing the corrosion, materials compatibility or other potential collateral damage effects caused by these agents. These data mainly address the typical storage and distribution system materials and do not address the necessary range of issues required to assess all potential aircraft exposures. In order to project the potential collateral damage, the general corrosion behavior and data for typical aviation alloys were used to supplement the limited specific data available. The general analysis indicated that significant collateral damage potential exists for airframes, structures and engines. While it is more likely that significant damage would result from a long-term exposure, potentially catastrophic short-term corrosion issues are also indicated. Increased corrosion rates are indicated for aluminum and magnesium based on the pH of bicarbonate agents and their breakdown products. The potential for turbine component damage is indicated from high temperature corrosion and through overheating caused by physical clogging of cooling holes.

Subject Categories:

  • Safety Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE