Originally Posted by
Herkflyr
Nope. No callout is possible on an x-day. If the company has any flying for you on your first on-call day, they must assign it NLT 1500 on your last X day. Simple as that.
So let's say you check your schedule at 1700 on your last X-day. Either there will be a trip assigned, with a sign in NLT 1200 (or short call reporting NLT 1000), or there will be nothing.
Assuming there is nothing, you just assume the long call 12-hour window beginning at midnight.
You can have a sign in earlier than 1200 or SC earlier than 1000 (0500 for both) on your first reserve day. Like you said, it needs to be on your schedule prior to 1500 base time on your last X day. If you don't check your schedule until 1700, it doesn't matter - they can still give you an 0500 report - as long as it was put on your schedule prior to 1500. So in effect, your on call clock does indeed start while you are still on an X day.