Crp controller described a loss of separation event when a military training aircraft made an unanti...

Narrative:

A BE20 was doing the full procedure turn for the TACAN 13R to join the arc. A T34 was on a vector in the crosswind for a ground controlled approach (gca). When the BE20 was on his inbound turn he started to deviate westbound. They do this often and join the arc not at the IAF (rynol). I turned the T34 from a 040 to a 340 to follow the BE20. The BE20 then turned back towards rynol now going more eastbound. The turn is suppose to be a 218 heading to join. When the BE20 passed over rynol instead of going westbound went a little east. I have the ptl on and at rynol the BE20 and the T34 were opposite direction from each other. I caught this right away and turned the T34 to a 040 and climbed the aircraft to 030. I also told the BE20 to turn to a 310 heading. The BE20 never took the heading and eventually joined the arc. The closest they got was 2.98. When I turned the T34 to the 340 I allowed enough room for the BE20 to go east to rynol to join the arc. It was the fact the reaching rynol he made a turn even more eastbound. I originally thought he was joining the arc the wrong way. I caught him going east from rynol right away and if he would have taken my control instruction to 310 separation never would have been lost. If the pilot would have informed me that he was going to deviate from the approach plate I would have known not to turn the T34. The military is training; but they have way too many deviations. I believe the pilots think that pilot deviations are ok because they are training. If they were held accountable for a deviation maybe the number of pilot deviations would go down. If military gets a pilot deviation nothing seems to happen or change. The military deviates without telling ATC all the time and many of the times cause an unsafe situation. If they just would tell us when they are going to deviate we could accommodate a lot of the time.

Original NASA ASRS Text

Title: CRP Controller described a loss of separation event when a military training aircraft made an unanticipated turn for a TACAN Approach arc; the reporter indicating the military does not hold the training aircraft accountable.

Narrative: A BE20 was doing the full procedure turn for the TACAN 13R to join the arc. A T34 was on a vector in the crosswind for a Ground Controlled Approach (GCA). When the BE20 was on his inbound turn he started to deviate westbound. They do this often and join the arc not at the IAF (RYNOL). I turned the T34 from a 040 to a 340 to follow the BE20. The BE20 then turned back towards RYNOL now going more eastbound. The turn is suppose to be a 218 heading to join. When the BE20 passed over RYNOL instead of going westbound went a little east. I have the PTL on and at RYNOL the BE20 and the T34 were opposite direction from each other. I caught this right away and turned the T34 to a 040 and climbed the aircraft to 030. I also told the BE20 to turn to a 310 heading. The BE20 never took the heading and eventually joined the arc. The closest they got was 2.98. When I turned the T34 to the 340 I allowed enough room for the BE20 to go east to RYNOL to join the arc. It was the fact the reaching RYNOL he made a turn even more eastbound. I originally thought he was joining the arc the wrong way. I caught him going east from RYNOL right away and if he would have taken my control instruction to 310 separation never would have been lost. If the pilot would have informed me that he was going to deviate from the approach plate I would have known not to turn the T34. The military is training; but they have way too many deviations. I believe the pilots think that pilot deviations are OK because they are training. If they were held accountable for a deviation maybe the number of pilot deviations would go down. If military gets a pilot deviation nothing seems to happen or change. The military deviates without telling ATC all the time and many of the times cause an unsafe situation. If they just would tell us when they are going to deviate we could accommodate a lot of the time.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1045297
Time
Date	201210
Local Time Of Day	0001-0600
Place
Locale Reference	CRP.Airport
State Reference	TX
Aircraft 1
Make Model Name	Super King Air 200
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Track / Heading All Types

Crp controller described a loss of separation event when a military training aircraft made an unanticipated turn for a TACAN approach arc; the reporter indicating the military does not hold the training aircraft accountable.