Original Message

I see some job ads for AMC have a primary AC such as an EC135 and secondary as a EC130 while others have no secondary. Is the secondary mainly used a back up for when the primary is down for maintenance?  

On bases that have no secondary, what happens when that EC135 or Bell 429 is down for major maintenance or an annual? Do they bring in a replacement AC or does the crew just sit around and do nothing, or do they get assigned busy work? Thanks in advance.