Private pilot of small aircraft; confused as to which parallel runway preceding traffic was cleared; lands on the same runway while still occupied by the aircraft.

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Attributes
ACN	760251
Time
Date	200710
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : chd.airport
State Reference	AZ
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : chd.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	landing : roll
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 8 flight time total : 4085 flight time type : 85
ASRS Report	760251
Events
Anomaly	conflict : ground less severe ground encounters other non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 300
Supplementary
Problem Areas	Airport Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Upon downwind (left traffic) I was advised to continue pattern and follow traffic. The traffic was on right base for runway 22L. I was on left traffic for runway 22L as well. I thought that the traffic was doing right traffic for runway 22R. Upon turning base and final; there was marginal separation between me and the traffic in the front. I was not advised to go around on final. I thought that the separation was sufficient and that the traffic would takeoff before I crossed the runway threshold. I did not go around or deviate because I was not advised to do so and also; I had the impression that a 'go around' would be unsafe due to the traffic in the pattern on downwind or flying over top of the traffic that landed in front of me; whose intentions seemed unclr to me. Traffic in the front had called for touch and goes but seemed to have been trying to stop on the runway prior to taking off again. I stopped the aircraft within approximately 300 ft off the aircraft in the front. I was unaware that the traffic; while we were still flying; was the traffic I was supposed to follow. I was already 45 degrees from the runway on downwind while the traffic made a right turn for final.

Original NASA ASRS Text

Title: PRIVATE PLT OF SMA; CONFUSED AS TO WHICH PARALLEL RWY PRECEDING TRAFFIC WAS CLRED; LANDS ON THE SAME RWY WHILE STILL OCCUPIED BY THE ACFT.

Narrative: UPON DOWNWIND (L TFC) I WAS ADVISED TO CONTINUE PATTERN AND FOLLOW TFC. THE TFC WAS ON R BASE FOR RWY 22L. I WAS ON L TFC FOR RWY 22L AS WELL. I THOUGHT THAT THE TFC WAS DOING R TFC FOR RWY 22R. UPON TURNING BASE AND FINAL; THERE WAS MARGINAL SEPARATION BTWN ME AND THE TFC IN THE FRONT. I WAS NOT ADVISED TO GO AROUND ON FINAL. I THOUGHT THAT THE SEPARATION WAS SUFFICIENT AND THAT THE TFC WOULD TKOF BEFORE I CROSSED THE RWY THRESHOLD. I DID NOT GO AROUND OR DEVIATE BECAUSE I WAS NOT ADVISED TO DO SO AND ALSO; I HAD THE IMPRESSION THAT A 'GAR' WOULD BE UNSAFE DUE TO THE TFC IN THE PATTERN ON DOWNWIND OR FLYING OVER TOP OF THE TFC THAT LANDED IN FRONT OF ME; WHOSE INTENTIONS SEEMED UNCLR TO ME. TFC IN THE FRONT HAD CALLED FOR TOUCH AND GOES BUT SEEMED TO HAVE BEEN TRYING TO STOP ON THE RWY PRIOR TO TAKING OFF AGAIN. I STOPPED THE ACFT WITHIN APPROX 300 FT OFF THE ACFT IN THE FRONT. I WAS UNAWARE THAT THE TFC; WHILE WE WERE STILL FLYING; WAS THE TFC I WAS SUPPOSED TO FOLLOW. I WAS ALREADY 45 DEGS FROM THE RWY ON DOWNWIND WHILE THE TFC MADE A R TURN FOR FINAL.

Data retrieved from NASA's ASRS site as of January 2009 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.