EASA SIB SW-20-01: Robinson R44 and R66 Helicopters - Electrical Power System - Battery Electrolyte Leakage

What to do

Owners and operators of Robinson R44 and R66 helicopters should review and comply with Robinson Service Bulletin SB-99 for the R44 and SB-28 for the R66, which provide guidance on re-orienting battery installations and addressing any electrolyte leakage. There are no mandatory compliance deadlines since this is an informational bulletin, but timely adherence to the service bulletins is recommended to maintain airworthiness.

Summary

The Special Airworthiness Information Bulletin SAIB: SW-20-01 is an FAA informational bulletin addressing potential electrolyte leakage issues in the electrical power systems of Robinson R44 and R66 helicopters. The bulletin specifically concerns certain lead acid batteries manufactured by Concorde Battery, Inc., identified by Robinson part numbers B237-4 for the R44 and B237-7 and B237-8 for the R66 models. It informs operators about the leakage risk without mandating corrective action through an airworthiness directive.

What changed

This bulletin introduces awareness of electrolyte leakage from specific Concorde lead acid batteries installed in Robinson R44 and R66 helicopters. It highlights that although the batteries use absorbed glass mat technology, leakage has occurred when batteries are installed on their side. The bulletin also notes that Concorde has improved manufacturing procedures for batteries produced after January 2019 to reduce excess electrolyte.

Why it matters

This information is important for aviation professionals because electrolyte leakage can affect the reliability and safety of the helicopter's electrical power system. Operators and maintenance personnel need to be aware of the issue to prevent potential damage or operational disruptions. Understanding the battery orientation and following manufacturer service bulletins can help mitigate risks associated with electrolyte leakage.