Narrative:

Aircraft X was one of many flights making multiple instrument approaches to iwa. I was in the process of conducting ojti with a very inexperienced student. The aircraft were just beginning to come in and I knew I was going to have to step in at any minute. I somehow got distracted and allowed the student to delay aircraft X's turn off of the tower's assigned heading; and this allowed the aircraft to enter a 5600 ft MVA in level flight at 4000. I recognized the error as it was happening to try and turn him away from the MVA and climb him. I also asked if the pilot was able to make his own terrain separation and he advised he could not. I believe that he was in the MVA for about 5 sweeps and penetrated 2 or three miles into it. Recommendation; this was a personal lapse on my part. I should have stepped in earlier. I need to realize the caliber of the students I am training and adjust my training style accordingly.

Google
 

Original NASA ASRS Text

Title: P50 controller providing OJT experienced a terrain separation loss involving military flights when failing to take over the position soon enough to issue corrective turns away from the higher MVA area.

Narrative: Aircraft X was one of many flights making multiple instrument approaches to IWA. I was in the process of conducting OJTI with a very inexperienced student. The aircraft were just beginning to come in and I knew I was going to have to step in at any minute. I somehow got distracted and allowed the student to delay Aircraft X's turn off of the Tower's assigned heading; and this allowed the aircraft to enter a 5600 ft MVA in level flight at 4000. I recognized the error as it was happening to try and turn him away from the MVA and climb him. I also asked if the pilot was able to make his own terrain separation and he advised he could not. I believe that he was in the MVA for about 5 sweeps and penetrated 2 or three miles into it. Recommendation; this was a personal lapse on my part. I should have stepped in earlier. I need to realize the caliber of the students I am training and adjust my training style accordingly.

Data retrieved from NASA's ASRS site as of April 2012 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.