Narrative:

Inbound to cowboy on gregs 1 arrival with nbe as destination, INS navigation to waypoint 8 (craff) with nbe in waypoint 9. Aircraft reached craff and continued to nbe on same general heading. Noted 38 DME and initiated left turn to 080 magnetic heading. At same time ATC commanded turn to 070 degrees and asked about published turn. Published procedure is left to 080 degrees at 39 DME. Due to INS drift and no waypoint or load or turn to automatically, and navigating off of INS, turned 1 mi late. Recommend adding a waypoint on the 080 degree heading to be available to load for navigation.

Google
 

Original NASA ASRS Text

Title: DC9-30 FAILS TO TAKE UP THE 080 DEG HDG AT CRAFF AS DIRECTED BY THE STAR. THE MAGIC IS INCAPABLE OF THIS TASK.

Narrative: INBOUND TO COWBOY ON GREGS 1 ARR WITH NBE AS DEST, INS NAV TO WAYPOINT 8 (CRAFF) WITH NBE IN WAYPOINT 9. ACFT REACHED CRAFF AND CONTINUED TO NBE ON SAME GENERAL HDG. NOTED 38 DME AND INITIATED L TURN TO 080 MAGNETIC HDG. AT SAME TIME ATC COMMANDED TURN TO 070 DEGS AND ASKED ABOUT PUBLISHED TURN. PUBLISHED PROC IS L TO 080 DEGS AT 39 DME. DUE TO INS DRIFT AND NO WAYPOINT OR LOAD OR TURN TO AUTOMATICALLY, AND NAVING OFF OF INS, TURNED 1 MI LATE. RECOMMEND ADDING A WAYPOINT ON THE 080 DEG HDG TO BE AVAILABLE TO LOAD FOR NAV.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.