Mark,
>>>> Are there any time limits that apply to corporate pilots operating exclusively under Part 91?
No, the only "limitation" is 91.13, careless and reckless operation. Flying when fatigued could be considered to be a violation of 91.13. Other than that, there are no limits to flight hours or duty time in Part 91, corporate or otherwise.
>>>>You're talking about a situation in which the pilot is at the end of her duty day and is then assigned a repositioning flight, right? They said that a repositoning flight is a part 91 flight, no matter who you're repositoning it for. So it's simply not subject to 135 or 121 time limits. (But it would be counted as "commercial flying" to figure out if the next 121/135 flight exceeded the limits). Am I close?
Yes, that is the situation. The flight would not be subject to part 135 or 121 regulations, but it is considered commercial flying, as the pilot is getting paid to exercise privileges of his Pilot Certificate.
Clearly, the time must be considered for subsequent revenue flights, that's not an issue.
However 121.471 (and it's counterpart in Part 135) seem to prohibit the certificate holder from assigning and the pilot from accepting assigments for"other commercial flying" in excess of the flight time limits.
If not, what are the purpose of the words "in other commercial flying" in this phrase:
".....an assignment for flight time in scheduled air transportation or in other commercial flying.."
My question is twofold. First it seems to me that the plain english meaning of the words prohibit a certificate holder from assigining "other commercial flying" in excess of 121 or 135 limits. Is there something I'm missing here? The second part is if the plain english meaning is that the certificate holder may not assign "other commercial flying" is FAA counsel permitted to interpret the regulation contrary to it's plain english meaning? (There are several Chief Counsel interpretation which say that repositioning flights may exceed flight time limitations)
To add a little more food for thought, a pilot I know well was the subject of an enforcement preceeding for this. It was a while back, I don't know how long ago. He was flying for a Part 135 operator. According to my understanding of the story he had flown a full day under part 135, then was asked to fly a mechanic, tools and parts to another location to fix a helicopter which belonged to the certificate holder (obviously not a part 135 flight), and the FAA brought an enforcement action against him for exceeding flight time limitations in "other commercial flying" assigned by the certificate holder. Ultimately it was dismissed as a stale complaint, but the enforcement seems to support my reading of the regulation.
regards