ATCT local controller confuses aircraft and clears 2 aircraft to land on same runway. Tower and lower landing aircraft see other aircraft and tower is able to instruct higher aircraft to go around. The lower aircraft lands.

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Attributes
ACN	422079
Time
Date	199812
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rhv
State Reference	CA
Altitude	msl bound lower : 400 msl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Viking
Operating Under FAR Part	Part 91
Flight Phase	landing other
Route In Use	approach : visual arrival other
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	landing other
Route In Use	approach : visual arrival other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : instructor
Experience	flight time last 90 days : 40 flight time total : 7000 flight time type : 300
ASRS Report	422079
Person 2
Affiliation	Other
Function	instruction : trainee
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew faa : investigated
Miss Distance	horizontal : 20 vertical : 20
Supplementary
Air Traffic Incident	Operational Error

Narrative:

Rhv has 2 runways (runway 31L and runway 31R). My student and I were assigned runway 31L. During our 8 KM approach, tower seemed to be confused between a luscombe and our aircraft. We were also transmitting and receiving on 126.1. Approximately 1 mi from airport, tower assigned runway 31R. There did not seem to be another aircraft in front of me or getting ready to take off. Therefore, I confirmed with tower if they wanted aircraft X (aircraft I was in) to move to runway 31R. Tower cleared us to land runway 31R. At this time we were also on 119.8, frequency for runway 31R. We commenced to make landing. Out of my left window (I was sitting in back), I saw a C152 (aircraft Y) starting to land on top of us. Tower also saw the situation and told aircraft Y to go around. I called tower when I was on the ground (by telephone). They admitted to me a mistake had been made on their part. Tower had actually cleared 2 aircraft to land runway 31R. The C152 landed safely, upon executing a go around.

Original NASA ASRS Text

Title: ATCT LCL CTLR CONFUSES ACFT AND CLRS 2 ACFT TO LAND ON SAME RWY. TWR AND LOWER LNDG ACFT SEE OTHER ACFT AND TWR IS ABLE TO INSTRUCT HIGHER ACFT TO GAR. THE LOWER ACFT LANDS.

Narrative: RHV HAS 2 RWYS (RWY 31L AND RWY 31R). MY STUDENT AND I WERE ASSIGNED RWY 31L. DURING OUR 8 KM APCH, TWR SEEMED TO BE CONFUSED BTWN A LUSCOMBE AND OUR ACFT. WE WERE ALSO XMITTING AND RECEIVING ON 126.1. APPROX 1 MI FROM ARPT, TWR ASSIGNED RWY 31R. THERE DID NOT SEEM TO BE ANOTHER ACFT IN FRONT OF ME OR GETTING READY TO TAKE OFF. THEREFORE, I CONFIRMED WITH TWR IF THEY WANTED ACFT X (ACFT I WAS IN) TO MOVE TO RWY 31R. TWR CLRED US TO LAND RWY 31R. AT THIS TIME WE WERE ALSO ON 119.8, FREQ FOR RWY 31R. WE COMMENCED TO MAKE LNDG. OUT OF MY L WINDOW (I WAS SITTING IN BACK), I SAW A C152 (ACFT Y) STARTING TO LAND ON TOP OF US. TWR ALSO SAW THE SIT AND TOLD ACFT Y TO GO AROUND. I CALLED TWR WHEN I WAS ON THE GND (BY TELEPHONE). THEY ADMITTED TO ME A MISTAKE HAD BEEN MADE ON THEIR PART. TWR HAD ACTUALLY CLRED 2 ACFT TO LAND RWY 31R. THE C152 LANDED SAFELY, UPON EXECUTING A GAR.

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.