CitationJet From United States of America, joined Mar 2003, 2098 posts, RR: 4 Reply 1, posted (8 years 3 weeks 17 hours ago) and read 1367 times:
Per FAR Part 135.217 IFR Takeoff Limitations:
You cannot takeoff when the airport is above IFR minimums, but is below IFR LANDING minumums unless there is an alternate airport within 1 hours flying time of the airport of departure.
Part 135 is commuter and on-demand commercial operation requirements..
OPNLguy From , joined Dec 1969, posts, RR: Reply 2, posted (8 years 3 weeks 14 hours ago) and read 1279 times:
>>>Can an airliner depart if the conditions (visibility cloudbase etc) are good enough for a take-off but not for a landing?
Generally speaking, you need 1/2 mile to land, and only 1/4 mile to takeoff, so yes, that situation comes up all the time.
>>>Can the crew nominate anteater airport to land at in case of a problem at or after V1/ Is their a limit to how close this field would have to be?
Here is the US, under Part 121 Domestic/Flag Ops, the flight's dispatcher will have specified a takeoff alternate for the departure airport on the dispatch release itself. For a 2-engined aircraft, the takeoff alternate has to be within 1 hour's flight time, still air, with one engine inop, and the takeoff alternate must meet all the usual requirements for alternates (legal weather, etc.). A 3- or 4-engined aircraft can use a takeoff alternate up to -two- hours away, same criteria, except for the time.
All that's here in the USA, regs of of other countries may vary, but the concepts are similar...
Dragogoalie From Australia, joined Oct 2001, 1220 posts, RR: 8 Reply 3, posted (8 years 3 weeks 11 hours ago) and read 1243 times:
For general aviation (part 91) there actually aren't any takeoff minimums. You could legally take off in 0/0 if you want to. Not one of the smartest things to do, but you could if you want to. But for the reasons you said above a lot of pilots wont take off if the airport is below mins just incase they need to come back for whatever reason.
SQ325 From Germany, joined Jul 2001, 1432 posts, RR: 9 Reply 4, posted (8 years 2 weeks 4 days 23 hours ago) and read 1116 times:
If we take off from a Airport only with a CAT1 ILS we have a landing minimum that is higher than our take off minimum. RVR 550m Ceilling 200ft
But we can still perform a take off with a RVR of 125m ( if the airport is equipped with the neccessary light system )
London City is a good example. They have a CAT1 approach and in the case that during our turn around the weather goes down below CAT1 minimum we have to add a take off alternate in our fliht plan. could be LGW or STN!
Buckfifty From Canada, joined Oct 2001, 1309 posts, RR: 24 Reply 6, posted (8 years 2 weeks 4 days 21 hours ago) and read 1102 times:
We have a Take-Off minima that says we need a diversion airport within 500 nm with greater than CAT I minima if the conditions at the departure airport are below CAT I themselves.
Wing From Turkey, joined Oct 2000, 1551 posts, RR: 27 Reply 7, posted (8 years 2 weeks 4 days 1 hour ago) and read 1036 times:
SQ325 is correct about it.I'd like add that weather is not the only reason for the captain to divert another field after TO.In high performance jet aircraft there are also limiting factors or emergencies which may effect your landing decision back to departure airfield or to another one with better facilities or simple a longer runway.
Lets take a engine problem for example.You'll make a faster approach because of flap15 landing,you'll need longer landing distance.There are landing distance grahps in your manuals for each runway.The captain may decide to fly to another airport which has longer runway.
These posibilties are discussed in departure briefings weather to land back or divert to TO alternate.
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