Hi,
I'm not sure what you mean by "airport databank".
Not enough fuel for a go around is very unlikely because of the legal requirements for minimum takeoff fuel. You'd have to be having a particularly bad day not to have enough to go around.
The weather picture you've painted is also unlikely and would prompt any captain to take even more fuel. Many aircraft couldn't land in those conditions even with everything working.
So, if your question is "If there were no approach aids, how close would the on board navigation systems (with or withouth GPS) get you to the runway?" then the answer is... pretty close! IRS (if you've got it) is fairly reliable, if you've got 3 of them and they average the position, you might not hit the runway, but you would probably hit the grass next to it.
"Is this kind of approach recommended in this situation?"
The pilot is allowed to do whatever he deems necessary in the interest of safety. In this case, it sounds like if he doesn't just "aim at the runway only using IRS for guidance" he will run out of fuel and just crash somewhere anyway, so he has to use what he's got.
Last edited by welliewanger; 21st Jan 2010 at 05:38.
Reason: typo