Instructor pilot during training flight with a student in a small aircraft sel misunderstood landing clearance by continuing on to the other parallel runway where another aircraft was on final. The reporter took evasive action after sighting the other aircraft.

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Attributes
ACN	473678
Time
Date	200005
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mlb.airport
State Reference	FL
Altitude	agl single value : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mlb.tower
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude descent : intermediate altitude
Route In Use	approach : traffic pattern
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : mlb.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Navigation In Use	ils localizer & glide slope : 9r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 70 flight time total : 370 flight time type : 350
ASRS Report	473678
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : airborne critical non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 600 vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

There were about 5 airplanes in the pattern at this time, and the controller was getting nervous, refusing some airplanes into the class D momentarily. On the downwind for runway 9L, we requested a full stop on runway 9R. Tower instructed us to 'continue.' we interpreted this as an acceptance to our request to switch runways. We proceeded to runway 9R. Just before turning final, we saw another airplane on an IFR flight plan on a straight in final. We took evasive action. 1) we misunderstood the meaning of the instruction 'continue.' 2) the controller was busy and forgot to keep an eye on us, especially since we requested a runway change.

Original NASA ASRS Text

Title: INSTRUCTOR PLT DURING TRAINING FLT WITH A STUDENT IN A SMA SEL MISUNDERSTOOD LNDG CLRNC BY CONTINUING ON TO THE OTHER PARALLEL RWY WHERE ANOTHER ACFT WAS ON FINAL. THE RPTR TOOK EVASIVE ACTION AFTER SIGHTING THE OTHER ACFT.

Narrative: THERE WERE ABOUT 5 AIRPLANES IN THE PATTERN AT THIS TIME, AND THE CTLR WAS GETTING NERVOUS, REFUSING SOME AIRPLANES INTO THE CLASS D MOMENTARILY. ON THE DOWNWIND FOR RWY 9L, WE REQUESTED A FULL STOP ON RWY 9R. TWR INSTRUCTED US TO 'CONTINUE.' WE INTERPRETED THIS AS AN ACCEPTANCE TO OUR REQUEST TO SWITCH RWYS. WE PROCEEDED TO RWY 9R. JUST BEFORE TURNING FINAL, WE SAW ANOTHER AIRPLANE ON AN IFR FLT PLAN ON A STRAIGHT IN FINAL. WE TOOK EVASIVE ACTION. 1) WE MISUNDERSTOOD THE MEANING OF THE INSTRUCTION 'CONTINUE.' 2) THE CTLR WAS BUSY AND FORGOT TO KEEP AN EYE ON US, ESPECIALLY SINCE WE REQUESTED A RWY CHANGE.

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.