Provides guidelines and recommendations concerning ELT battery 
construction, storage and methodology for qualifying 
replacement batteries. An appendix concerning considerations 
for design and manufacture of batteries for ELTs is included. 
Prepared by SC-136 Battery Subcommittee

TSO-C91a provided free of charge with purchase of this document.

NOTE:  The electronic DO-188 is a pdf file but it is not in 
searchable format.