It is a bit academic, since you are never going to see those three words by themselves in a TAF in the real world, but if you did then common sense and good airmanship would prevail and you would plan to carry 60 minutes of extra juice or plan for an alternate. That goes without saying.
But the CASA exam is not about common sense or airmanship, it is about what the law says. There is nothing in any of the Regs or other publications that says you have to plan for an alternate or carry any holding fuel for a TEMPO SCT CB. So the only correct answer is 'No Requirement', which is what I selected. The CyberExam system obviously does not agree! Remember that a TEMPO will only require 60 minutes of holding fuel if the temporary visibility or weather or cloud that is being described is below the alternate minima. So for example TEMPO BKN010 would require holding fuel, but TEMPO BKN015 would not. TEMPO SCT CB contains nothing below alternate minima for us to be concerned about. If there were no TS forecast, but moderate or severe turbulence was expected to be associated with the CB, then this would be included in the TAF - for example TEMPO SCT CB MOD/SEV TURB IN CB (AIP GEN 3.5 para 15). The exam question did not include any such reference to turbulence so we cannot consider it in providing a valid answer.
Back in the real world, AIP GEN 3.5 para 12.12.6 tells us that whenever CB is forecast, we will get a forecast as to the degree of TS activity expected or its probability. So in the real world we are content, but what this paragraph tells us for the purposes of the exam is that the question is incomplete and cannot be answered with any degree of accuracy. Lets take a hypothetical based on the exam question, a TAF that says:
TEMPO SCT CB INTER 3000 TSRA. This would require us to carry only 30 min holding fuel or an alternate! Or, what about this TAF: FM0400
TEMPO SCT CB FM0500 TEMPO TSGR. For this forecast we would need 60 min holding fuel or an alternate, but not until an arrival after 0430 (when CBs have been forecast to have been around for 30 minutes already)! There are any number of variations on this that make the TEMPO SCT CB part of the TAF meaningless for answering the question.
Anyway, just a bit miffed at missing out on the big 100 because of such a silly question. I'll get over it
![:) :)](/media/kunena/emoticons/smile.png)
We all know that there a few curly questions in the CASA exams that are designed to be a bit on the tricky side - this question stood out to me as one of those. I would suggest that whoever wrote the question did not consider the fact that it is perfectly legitimate to have CB clouds but no TS (ie in their mind CB=TS, which is of course not the case).