GA pilot reported tower controller cleared two aircraft to land on the same runway; resulting in a g...

Attributes
ACN	1586808
Time
Date	201810
Local Time Of Day	1201-1800
Place
Locale Reference	IWA.Tower
State Reference	AZ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 300
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict
Miss Distance	Horizontal 1350 Vertical 0

Narrative:

I was in aircraft X. I was cleared to land 30L whilst in the downwind. (There was another aircraft instructed to follow us from the south west gap arrival) we had turned final and the controller asked us to land 30C - I checked and there was another aircraft at our altitude on the parallel runway - I queried the controller - he stated he wanted us to land 30C - so I called a go-around as this would have ended in a collision. The controller asked me to ident - he also called the go-around and then cleared aircraft Y to change and land 30C. The airspace was getting saturated and I believe that he controller due to task saturation mixed us and aircraft Y. As a result of good communication on both parts we reentered the pattern safely and landed.

Original NASA ASRS Text

Title: GA pilot reported Tower Controller cleared two aircraft to land on the same runway; resulting in a go-around.

Narrative: I was in Aircraft X. I was cleared to land 30L whilst in the downwind. (There was another aircraft instructed to follow us from the south west gap arrival) We had turned Final and the controller asked us to land 30C - I checked and there was another aircraft at our altitude on the parallel runway - I queried the controller - he stated he wanted us to land 30C - so I called a Go-around as this would have ended in a collision. The controller asked me to Ident - he also called the go-around and then cleared Aircraft Y to change and land 30C. The airspace was getting saturated and I believe that he controller due to task saturation mixed us and Aircraft Y. As a result of good communication on both parts we reentered the pattern safely and landed.

Data retrieved from NASA's ASRS site 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.

GA pilot reported tower controller cleared two aircraft to land on the same runway; resulting in a go-around.