Hi all, I have the Navigation text book
Apart from the topics included in the book, are there other areas of the MOS that are examinable?
I from the forum, fuel planning questions is a possibility
Id be grateful if there is anyone who has recently sat the exam who can guide re. what to expect
Also another question, re margin. I have the AC 91-15 c210 circular but the example is discretionary fuel is )
It states that the margin is total fuel - fuel required, but if you include discretionary fuel, then does that diminish the margin?
there was no great clarity re over this
Kind regards
Ravi,
Trust that the humid north is treating you well.
(a) if it's in the MOS, it's fair game for the examiner. Having said that, what is likely to be in the exam ? Your guess is as good as mine. Certainly, it is a sound tactic to review the MOS and make sure that you are comfortable with all the topics therein.
(b) margin is just that - whatever you have in excess of minimum fuel required for the flight. The rest is semantics. Sometimes you might go with negligible margin (eg, payload considerations) and I have had to do that a few times in years long gone by on the F27. Sometimes you might stick a few extra thousand pounds on just because the weather forecast looked a bit suss. We did that regularly for night flights east coast to west coast (Perth). to provide a bit more flexibility for a diversion, should it come out of the blue. Indeed, the aim is always to make sure that you have considered this, that, and every other option so that the chance of being caught out, flatfooted, is minimal. The mantra is that all excitement in civil flying should be reserved for the overnight, not the flight.
Engineering specialist in aircraft performance and weight control.
Thank you again John, really appreciate the advice, there was one practice question and one of the stems had a discretionary amount above the minimal for the flight
I took margin to include discretionary and did not subtract and got the question wrong
If I had subtracted the discretionary amount, I would have got the question correct
Kind regards
Ravi
And it is hot here! thanks again
Again, I suggest, semantics. Really, it doesn't matter. Provided you observe the basic rule ("don't run out of gas"), I don't think that anyone is going to get too excited. On the other hand, run of gas and everyone will get excited.
There may be some words hidden away in the CASA stuff which discriminates between the terms but I am not aware of such. That is, for this piklot, the two terms are, functionally, the same.
Apart from that, the AC defines "margin" as "the amount of usable fuel in excess of the fuel required" so I reckon that makes the consideration a moot point. By any reasonable interpretation, any spare fuel, by whatever term described, is part of margin fuel.
I guess that makes you a man of reasonable interpretation ?
Engineering specialist in aircraft performance and weight control.
I agree semantics and I hope CASA is clear cut with questions
Kind regards
Ravi
