Appendix 2

GTBA Code of Practice - Issue No.10

3rd April 2022

Hazardous Materials

Hydrocarbon Fuels and Oils

There are health hazards associated with fuels and oils and suppliers are bound by law to make health and safety information available to users of such products. It is recommended that copies of the Material Safety Data Sheets are obtained; these can be obtained, for instance, from the garage supplying the products. The data sheets will give information in respect of the acute and chronic health hazards together with first aid and emergency action. To emphasise the importance of obtaining such information the following is an extract from a diesel fuel data sheet in respect of the chronic health hazard:-

"Skin contact over prolonged and repeated periods can lead to defatting of the skin, dermatitis, erythema, oil acne and oil folliculitis. Where occupational and personal hygiene practices have been of a poor standard, warty growths have occurred and these can become cancerous."

Viton Synthetic Rubber

Viton rubber is a fluoroelastomer and if heated beyond 400oC does not burn but decomposes with the formation of HYDROFLUORIC ACID. This acid is extremely corrosive and is almost IMPOSSIBLE to REMOVE once it has contaminated the skin. Any person required to inspect and/or replace any overheated gaskets or seals made from this material should not permit, under any circumstance, contact with the bare skin. VERY NASTY BURNS may occur, which under extreme circumstances could lead to the need for AMPUTATION.

High temperature oil resistant Viton o-rings are capable of operating in temperatures down to -15oC and up to +200oC. The much safer Nitrile o-rings are capable of withstanding temperatures from -40oC to +110oC for long periods with excursions to 135oC . It is strongly advised that Viton 0-rings are not used for any purpose in gas turbine engine construction.

Turbine Oils containing Organophosphates

Special lubricating oils, designed for full size aviation gas turbine operation, may contain hazardous chemicals such as organophosphates. These additives are included specifically to enable a wide range of operating environment from sea level to high altitude, where low pressure and low temperatures are normal. Commercial gas turbines typically employ fully sealed lubricating systems, preventing vapour from these lubricating oils being released into the atmosphere. Given suitable precautions to avoid skin contact and the breathing of the vapours, these oils may be used. However, non-toxic alternatives such as Mobil DTE Light and similar terrestrial based gas turbine lubricating oils are available and have been used very successfully in model gas turbines. Many operators may prefer to use these lubricating oils because of their environmentally friendlier properties. If you are in any doubt as to the suitability of these oils for your particular engine you are advised to consult the designer or manufacturer.