Since this topic keeps coming up, can someone provide a reference for an FAA Document that states that being on call for a 135 is considered rest. The subject keeps coming up. Every reference I find says it is against the rules. It seems to be a popular opinion that it is okay. A wise instructor of mine once told me that unless I could prove and document something that it was just an opinion. And you know what they say about opinions. The FAA has plenty of reference for rest requirements, definitions, examples. I have yet to see one that says on call is rest. I would like for someone who feels that it is rest to provide documentation beyond "my POI says its ok". If I am incorrect about this I would sincerely like to learn the correct interpretation but have been unable to find any reference for this interpretation. Thank you in advance. Everything I find says that if you are available for work/duty "should the need arise" then you are not at rest. Available for duty should the need arise sounds like "on call".