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The cost of preventing and controlling corrosion in aging aircraft fleets is becoming a significant burden. Early detection of corrosion will reduce the maintenance required to repair the damage, which should result in increased aircraft availability and significant reduction in the cost of ownership. Fluorescent fiber optic sensors that detect aluminum cations from the early stages of the corrosion process are proposed as a means for providing early warning of corrosion in susceptible areas of an aging aircraft. This article will discuss the results for two different carriers of an aluminum-sensing fluorophore and some of the key technical issues that need to be resolved for the development of an effective fiber optic sensing system.

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This paper present results from a large number of airborne salinity measurements in Australia and south-east Asia (SEA). Salinity measurements were made in the open on clear ground, in the open in urban regions, and on the facades of buildings. The data were used to assess the validity of the concepts regarding saline sources and transport presented in previous papers. In particular, the salinity measurements in SEA are used to assess the validity of the models for ocean produced salt aerosol. A classi cation scheme for de ning sheltering by man made and natural landforms and types of water bodies was developed. The data were then used to assess the sheltering effect of urban landforms and of building facades. Lastly, the data were used to assess the possible contribution of narrow and wide bays to airborne salinity.

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