B757 crew made a go around when tower cleared aircraft into position ahead of them.

Attributes
ACN	450720
Time
Date	199909
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia.airport
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mia.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 9l other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : mia.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	ground : position and hold
Person 1
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	450720
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : took precautionary avoidance action flight crew : executed missed approach
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were on short approach for runway 9L at mia, and the tower cleared someone in position. As things were getting a little tight, he asked us to make a quick s-turn to the left. The copilot (who was brand new) was flying and made a relative sharp turn to the left and stopped descending. By that time, maneuvering back for a safe approach was impossible. We instead made a 180 eeg turn and started a new downwind. When I asked the copilot what was going on, she thought he said to make a 360 degree turn. Initially, the tower was confused what we were doing. I explained the situation. He said, no problem, climb to 1500 ft, heading 270 degrees and re-enter downwind.' we came back and landed normally. A couple of points: it was my decision to re-enter downwind. Flying the published missed approach would not have been a safe option because of the aircraft taking off.

Original NASA ASRS Text

Title: B757 CREW MADE A GAR WHEN TWR CLRED ACFT INTO POS AHEAD OF THEM.

Narrative: WE WERE ON SHORT APCH FOR RWY 9L AT MIA, AND THE TWR CLRED SOMEONE IN POS. AS THINGS WERE GETTING A LITTLE TIGHT, HE ASKED US TO MAKE A QUICK S-TURN TO THE L. THE COPLT (WHO WAS BRAND NEW) WAS FLYING AND MADE A RELATIVE SHARP TURN TO THE L AND STOPPED DSNDING. BY THAT TIME, MANEUVERING BACK FOR A SAFE APCH WAS IMPOSSIBLE. WE INSTEAD MADE A 180 EEG TURN AND STARTED A NEW DOWNWIND. WHEN I ASKED THE COPLT WHAT WAS GOING ON, SHE THOUGHT HE SAID TO MAKE A 360 DEG TURN. INITIALLY, THE TWR WAS CONFUSED WHAT WE WERE DOING. I EXPLAINED THE SIT. HE SAID, NO PROB, CLB TO 1500 FT, HDG 270 DEGS AND RE-ENTER DOWNWIND.' WE CAME BACK AND LANDED NORMALLY. A COUPLE OF POINTS: IT WAS MY DECISION TO RE-ENTER DOWNWIND. FLYING THE PUBLISHED MISSED APCH WOULD NOT HAVE BEEN A SAFE OPTION BECAUSE OF THE ACFT TAKING OFF.

Data retrieved from NASA's ASRS site as of July 2007 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.