A be-40 flight crew experienced a TCAS RA when they descended to 5;000 when cleared to 6;000.

Attributes
ACN	1000000
Time
Date	201203
Local Time Of Day	1201-1800
Place
Locale Reference	FLL.Airport
State Reference	FL
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 135
Flight Phase	Descent
Route In Use	STAR FISEL 2
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 95.4 Flight Crew Total 4400 Flight Crew Type 800
Person 2
Function	First Officer
Events
Anomaly	Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

On the arrival we were busy on the TCAS as there were multiple targets in our general vicinity when were given 6;000 MSL. We were then given a descent to 5;000. Upon landing I was told to call the TRACON and was told I violated an altitude. After examination of the situation; we either answered a descend to 5;000 ft clearance intended for another airplane or replied to the clearance to descend to 6;000 ft and put 5;000 ft in the altitude window in error. In either situation there was a conflict with other traffic and I understand it is not acceptable. I will request a copy of the tape for my own personal use and possible training to other people in the future. To prevent this from happening in the future I will make sure to look at the altitude window and point to verify the altitude assigned and not just repeat without visual confirmation. I am personally and professionally embarrassed by this mistake.

Original NASA ASRS Text

Title: A BE-40 flight crew experienced a TCAS RA when they descended to 5;000 when cleared to 6;000.

Narrative: On the arrival we were busy on the TCAS as there were multiple targets in our general vicinity when were given 6;000 MSL. We were then given a descent to 5;000. Upon landing I was told to call the TRACON and was told I violated an altitude. After examination of the situation; we either answered a descend to 5;000 FT clearance intended for another airplane or replied to the clearance to descend to 6;000 FT and put 5;000 FT in the altitude window in error. In either situation there was a conflict with other traffic and I understand it is not acceptable. I will request a copy of the tape for my own personal use and possible training to other people in the future. To prevent this from happening in the future I will make sure to look at the altitude window and point to verify the altitude assigned and not just repeat without visual confirmation. I am personally and professionally embarrassed by this mistake.

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.