Is there an instrument departure procedure or minimum performance gradient in the absence of a published standard instrument departure (SID)?
Departing under instrument flight rules (IFR) in the United States airports sometimes have a SID procedure or alternate take-off minimums which must be observed in order to provide terrain and obstacle clearance.
If there is no SID or alternate take-off minimum published, is there a standard departure procedure to be used in the absence of other procedures? Is there a climb performance gradient which is assumed that provides clearance under such a departure?