Tower controller described a loss of separation event during a go around; the ATC instructions confu...

Narrative:

Air carrier X was sent around on a 120 heading due to air carrier Y slow roll still in the intersection with air carrier X very short final. I immediately coordinated with approach controller of the go around and was told to give the air carrier Y a 090 heading due to the go-around. Told the local controller to issue air carrier Y a 090 heading but the controller said they had already shipped the pilot to approach. I immediately went back to approach and they said they had him and had issued the 090 heading. During this time the supervisor was shouting instructions to the local controller and to my amazement the air carrier X was now on a 070 heading back toward air carrier Y. I then coordinated this to approach. In my opinion the supervisor should not have been shouting instructions to local as he did not know what was being coordinated. Had the supervisor stayed out of it; all would have been fine. To my understanding he had told local to 'give him a 070 heading' without specifying a call sign. His intervention without knowing the details caused a loss of separation in my opinion.

Original NASA ASRS Text

Title: Tower Controller described a loss of separation event during a go around; the ATC instructions confused when a Supervisor countermanded previously coordinated headings between the Tower and TRACON.

Narrative: Air Carrier X was sent around on a 120 heading due to Air Carrier Y slow roll still in the intersection with Air Carrier X very short final. I immediately coordinated with Approach Controller of the go around and was told to give the Air Carrier Y a 090 Heading due to the go-around. Told the Local Controller to issue Air Carrier Y a 090 heading but the Controller said they had already shipped the pilot to Approach. I immediately went back to Approach and they said they had him and had issued the 090 heading. During this time the Supervisor was shouting instructions to the Local Controller and to my amazement the Air Carrier X was now on a 070 heading back toward Air Carrier Y. I then coordinated this to Approach. In my opinion the Supervisor should not have been shouting instructions to Local as he did not know what was being coordinated. Had the Supervisor stayed out of it; all would have been fine. To my understanding he had told Local to 'give him a 070 heading' without specifying a call sign. His intervention without knowing the details caused a loss of separation in my opinion.

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	1056878
Time
Date	201212
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Coordinator
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Local
Qualification	Air Traffic Control Developmental
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Tower controller described a loss of separation event during a go around; the ATC instructions confused when a supervisor countermanded previously coordinated headings between the tower and TRACON.