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The Federal Aviation Administration has issued a Special Airworthiness Information Bulletin (SAIB) to alert Robinson R44 and R66 owners of a potential leakage issue with some types of lead acid batteries.
The issue affects three batteries produced by Concorde Battery, Inc. – Robinson part numbers B237-7 and P/N B237-8 (for the R66), and B237-4 (R44).
“There have been a number of reports of lead acid batteries leaking electrolyte,” the bulletin states. “Although the batteries are of absorbed glass mat (AGM) technology, leakage has occurred for batteries installed on their side (posts not oriented up).”