Installation of the Concorde RG-390E Lead Acid Battery in accordance with Helicopter Transport Services, Inc. (HTSI) Document No. HTS-LIBID-001, Installation Drawings for Concorde Valve Regulated Lead Acid Battery P/N RG-390E, Revision IR, dated October 16, 2002, and Section 7 of Concorde s document 5-0142, Instructions for Continued Airworthiness/Maintenance Manual Supplement Concorde Valve Regulated Lead-Acid Main Battery, Revision F, dated June 20, 2002, or later FAA approved revisions. This modification must be maintained in accordance with Concorde s document 5-0142 listed above. View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.