Finals19,
To add to Bose's point.
1 - you can air file for IFR in controlled airspace. For instance when calling up Solent for a transit they may well ask if you want it IFR or VFR. When they read back 'G-AXYZ, cleared direct SAM then via R090, at 4000 ft IFR', you have just air filed your fllight plan in controlled airspace.
2 - With regard to downgrading from RAS to RIS/FIS, I believe the controller can do this for a number of reasons including radar performance, controller workload, your choice not to comply with a vector for separation, etc.
3 - I 'cancel IFR' is the phrase you use to downgrade to VFR when you are IFR in controlled airspace, this then means you are no longer receiving separation. As Bose said, IFR in Class G is just a state of mind.
Last edited by mm_flynn; 20th March 2007 at 12:14.
Reason: spelling and noted this crossed with CM