Originally Posted by
ATCO Fred
Sorry . . .was washing my hair :-). Nope. . . MATS2 restriction, when radar shut aircraft can't self position to the NDB approach due lack of positive range check. Potentially, if we had advanced uses of the ATM and that element was covered in the RA . . . we could probably change that.
Fred
Why do you need a range check? Even in my light GA aircraft the IFR approved WAAS GPS ( dual fit) does a continuous RAIM in flight check, and knows where it is to an accuracy of tens of metres. Are you not allowed to accept the pilots known position?
I have self positioned to an IAP or NAV aid to an airfield without radar. Glos for instance when radar not available.
(The pilot will have checked GPS coverage for his route from the website prior to flight, and airmanship dictates enroute gross error checks with other available aids.)