RR Allison
RR advises operators of Model 250 series engines that “Salt laden humidity and chemicals will corrode the engine and cause it to fail.”
RR states that engines subjected to salt water contamination or other chemically laden atmosphere shall undergo water rinsing after shutdown following the last flight of the day.
RR reminds operators that salt laden air may be encountered up to 150 miles inland under certain conditions, and that all islands are considered a severe area.
The use of the highest quality water available, distilled or demineralized is recommended.
Source: Rolls Royce Commercial Service Letter