Originally Posted by
manho
I tried asking my pilot friend and he told me where to find the answer such as the operation manual but I am still not able to find it. Please advise!!
I don't know how it works over there, but in the US, the limitations come from the regulations, as Intruder said. The Airline's Operations Manual will have a section on flight and duty time limits. In my experience, this section repeats the regulations, with some additional explanation. It's possible that a carrier may have company limitations which are more restrictive than the regulations. If that were the ase, I would expect those limits to be published in the same section of the Operations manual.