if RAPCON(approach) can not use radar due to some problem(ex>electricity out, radar failure...) What does RAPCON do and be restricted their work?
Take any sections of the 7110.65 (and related military docs) that involve radar (radar separation, radar vectors, etc.) and throw them out the window. The rest remain in effect and perfect working order.
I think this is called "NON RADAR SITUATION" and i wonder can they do air traffic control or not.
Of course they can. Not every airport across the country has radar coverage to the ground, so there are already areas where non-radar procedures (e.g. for separation) will be used.
A radar is not necessary to provide ATC services (including separation); just ask oceanic controllers. Besides, if it was necessary, then someone sure wasted a lot of time on an entire chapter in the 7110.65: Chapter 6. Nonradar
I learned Pilot use SID, STAR...etc which can operate under non radar in this situationSome
SIDs/STARs can be used under this situation, sure. However, if it's a vectored or a hybrid SID, for example, then they wouldn't want to issue a clearance using that procedure for obvious reasons.
but if weather is not good, and pilot can not see outside(in cloud) i think just operating SID, STAR can be dangerous due to any traffic which do not contact control facility.
If the other traffic is IFR, they must be in communication with the controlling facility. Likewise, that facility would have used non-radar separation procedures to prevent any possible conflicts.
If the other traffic is VFR, then they shouldn't be in the clouds. Depending upon the airspace classification (and perhaps time of day), they should be remaining a safe distance away from clouds such that they can apply the "see and avoid" mantra of VFR flying.
if some vfr traffic suddenly contact RAPCON and request IFR clearance and radar vector due to weather, can RAPCON issue ifr clearance to vfr traffic?
For the first question, pop-up IFR clearance could be given... however you wouldn't receive a vector to your first fix for obvious reasons. Instead, you'll likely be maintaining VFR (you are responsible for your own terrain/obstruction clearance, navigation, and traffic avoidance) until reaching some fix (and likely joining an airway, since random routing e.g. using GPS can't be used). From there, you'll begin your IFR flight.
For the second question, obviously no, you won't receive a radar vector if there is no radar. I'm not even sure whether or not they can approve deviations such as "deviation west of course approved, when able, ..."
etc. If a simple altitude change won't suffice, you may have to work out an alternate clearance.
can RAPCON issue cleareance to fly some fix?(for example:C/S cleared to XXX(fix name), climb and maintain 9,000)
Are you asking about providing an IFR clearance or navigational guidance (such as the beginning of a route within an IFR clearance)?
If the former, yes, you can receive an IFR clearance to any fix - doesn't have to be an airport. Once you reach (and likely report) that fix, your IFR flight has been completed and you continue under VFR.
If the latter, then no, you wouldn't get navigational guidance to your first fix. In other words, you wouldn't hear "cleared to (somewhere) via direct (some fix)"
because the "direct" is a radar vector. Instead, see my above comment about remaining VFR until reaching a given fix (from which your IFR clearance begins, as opposed to it beginning from your present position when you requested the pop-up IFR).
I want to know What work can RAPCON do in NON RADAR SITUATION.
They can do anything that doesn't require the use of a radar.