<< >> NASA ASRS Report 357886, January 1997

ATCT local controller had a PA28 on right downwind for runway 32 and a C152 on a left downwind for the same runway. Controller told both aircraft he would call their turn for base leg for spacing. The controller turned the PA28 and shortly thereafter called the base leg turn for the C152. The PA28 overshot the final and had an near midair collision with the C152. When questioned the PA28 said he thought the tower was going to call his turn to final.

Attributes
ACN	357886
Time
Date	199701
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : srq
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : srq
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar pilot : instrument
Experience	controller non radar : 4 controller radar : 6 flight time total : 1000
ASRS Report	357886
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Cherokee was instructed to extend right downwind to runway 32 and that controller would advise when to turn base to follow traffic on final. Likewise, cessna was given the same instruction on the left downwind to runway 32. The 2 aircraft were abeam each other on the downwind legs. Cherokee was later instructed to turn base. Several seconds later the cessna was instructed to turn base. The cherokee did not turn final. The cherokee flew across the final into the cessna. When asked why he did this. The pilot stated, 'I thought you were going to call my final.' as a controller for 14 yrs and a pilot for over 20 yrs, I can only speculate that this is a human performance problem stemming from inadequate training.

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Original NASA ASRS Text

Title: ATCT LCL CTLR HAD A PA28 ON R DOWNWIND FOR RWY 32 AND A C152 ON A L DOWNWIND FOR THE SAME RWY. CTLR TOLD BOTH ACFT HE WOULD CALL THEIR TURN FOR BASE LEG FOR SPACING. THE CTLR TURNED THE PA28 AND SHORTLY THEREAFTER CALLED THE BASE LEG TURN FOR THE C152. THE PA28 OVERSHOT THE FINAL AND HAD AN NMAC WITH THE C152. WHEN QUESTIONED THE PA28 SAID HE THOUGHT THE TWR WAS GOING TO CALL HIS TURN TO FINAL.

Narrative: CHEROKEE WAS INSTRUCTED TO EXTEND R DOWNWIND TO RWY 32 AND THAT CTLR WOULD ADVISE WHEN TO TURN BASE TO FOLLOW TFC ON FINAL. LIKEWISE, CESSNA WAS GIVEN THE SAME INSTRUCTION ON THE L DOWNWIND TO RWY 32. THE 2 ACFT WERE ABEAM EACH OTHER ON THE DOWNWIND LEGS. CHEROKEE WAS LATER INSTRUCTED TO TURN BASE. SEVERAL SECONDS LATER THE CESSNA WAS INSTRUCTED TO TURN BASE. THE CHEROKEE DID NOT TURN FINAL. THE CHEROKEE FLEW ACROSS THE FINAL INTO THE CESSNA. WHEN ASKED WHY HE DID THIS. THE PLT STATED, 'I THOUGHT YOU WERE GOING TO CALL MY FINAL.' AS A CTLR FOR 14 YRS AND A PLT FOR OVER 20 YRS, I CAN ONLY SPECULATE THAT THIS IS A HUMAN PERFORMANCE PROB STEMMING FROM INADEQUATE TRAINING.

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.