TRACON controller described a below MVA event when traffic with a similar call sign initiated a turn...

Attributes
ACN	1083387
Time
Date	201304
Local Time Of Day	0001-0600
Place
Locale Reference	ICT.Airport
State Reference	KS
Aircraft 1
Make Model Name	T6A Texan II / Harvard II (Raytheon)
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 Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Two T6's; were on downwind. I turned the first T6 base and descended him to 3;000. Apparently; both aircraft took the turn and descended and the second T6 happened to be over an antenna with an MVA of 3;500. After listening to the tapes; I realized the second T6 readback the turn and descent as well. When I noticed the second T6 turning and descending; I immediately climbed him back to 3;500 and turned him back to downwind. The two aircraft came in to the airspace together; but I could have reminded them again of the similar sounding call signs. I also should have listened to the read back more closely.

Original NASA ASRS Text

Title: TRACON Controller described a below MVA event when traffic with a similar call sign initiated a turn and descent issued to another aircraft; the Controller immediately issuing corrective action.

Narrative: Two T6's; were on downwind. I turned the first T6 base and descended him to 3;000. Apparently; both aircraft took the turn and descended and the second T6 happened to be over an antenna with an MVA of 3;500. After listening to the tapes; I realized the second T6 readback the turn and descent as well. When I noticed the second T6 turning and descending; I immediately climbed him back to 3;500 and turned him back to downwind. The two aircraft came in to the airspace together; but I could have reminded them again of the similar sounding call signs. I also should have listened to the read back more closely.

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.

TRACON controller described a below MVA event when traffic with a similar call sign initiated a turn and descent issued to another aircraft; the controller immediately issuing corrective action.