Narrative:

Returning from a standard local flight in VFR conditions; I elected to perform a pattern entry maneuver that will be required for use in an upcoming project as a way of providing training and to increase proficiency with one other aircraft in the pattern on a left crosswind for runway 23 at shd airport; I decided that given their position and the type of approach that I wanted to perform it would be safer to enter r-hand traffic for runway 23 given that there was just the 1 other aircraft in the pattern at that time. In the time it took to establish a r-hand base; the other aircraft turned a l-hand base for runway 23 shortly after me. I had judged distance; closure rates; and speeds of both aircraft and deemed it safe to continue the approach as I would have arrived and cleared the runway prior to the other traffic having touched down. During the entire time; I had the other aircraft in sight and considered the situation safe to proceed. As I was beginning a turn to final; the other aircraft spotted us and deemed the situation to be unsafe given the proximity and decided to make a r-hand turn to exit the pattern and return for a landing when I had cleared the runway. During the whole event; we had been in radio contact; and the traffic opposite us had questioned our use of the r-hand traffic pattern and subsequently felt that the situation became unsafe at the point that they discontinued the approach. I cleared the runway and apologized on the radio for having made them uncomfortable and creating an inconvenience for them as they felt they had to re-enter the pattern. The pilot in the other aircraft expressed his angst at the situation verbally over the radio and proceeded to continue pattern work. Supplemental information from acn 700062: while the symphony 160 and the be-200 were paralleling in the downwind legs for runway 23 a dialog was maintained between the aircraft of position and intents. Due to my unfamiliarity of the course rules at shd; I questioned the PF if the airport had a restr for l-hand pattern only vice the recommended pattern suggested in the aim. He stated it did not. I later researched and found no restr but felt that a number of 'other' options could have been taken to prevent the symphony pilot from perceiving an unsafe condition.

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Original NASA ASRS Text

Title: KINGAIR BE200 FLT CREW ENTERS UNCTLED ARPT LNDG PATTERN INCORRECTLY.

Narrative: RETURNING FROM A STANDARD LCL FLT IN VFR CONDITIONS; I ELECTED TO PERFORM A PATTERN ENTRY MANEUVER THAT WILL BE REQUIRED FOR USE IN AN UPCOMING PROJECT AS A WAY OF PROVIDING TRAINING AND TO INCREASE PROFICIENCY WITH ONE OTHER ACFT IN THE PATTERN ON A L XWIND FOR RWY 23 AT SHD ARPT; I DECIDED THAT GIVEN THEIR POS AND THE TYPE OF APCH THAT I WANTED TO PERFORM IT WOULD BE SAFER TO ENTER R-HAND TFC FOR RWY 23 GIVEN THAT THERE WAS JUST THE 1 OTHER ACFT IN THE PATTERN AT THAT TIME. IN THE TIME IT TOOK TO ESTABLISH A R-HAND BASE; THE OTHER ACFT TURNED A L-HAND BASE FOR RWY 23 SHORTLY AFTER ME. I HAD JUDGED DISTANCE; CLOSURE RATES; AND SPDS OF BOTH ACFT AND DEEMED IT SAFE TO CONTINUE THE APCH AS I WOULD HAVE ARRIVED AND CLRED THE RWY PRIOR TO THE OTHER TFC HAVING TOUCHED DOWN. DURING THE ENTIRE TIME; I HAD THE OTHER ACFT IN SIGHT AND CONSIDERED THE SITUATION SAFE TO PROCEED. AS I WAS BEGINNING A TURN TO FINAL; THE OTHER ACFT SPOTTED US AND DEEMED THE SITUATION TO BE UNSAFE GIVEN THE PROX AND DECIDED TO MAKE A R-HAND TURN TO EXIT THE PATTERN AND RETURN FOR A LNDG WHEN I HAD CLRED THE RWY. DURING THE WHOLE EVENT; WE HAD BEEN IN RADIO CONTACT; AND THE TFC OPPOSITE US HAD QUESTIONED OUR USE OF THE R-HAND TFC PATTERN AND SUBSEQUENTLY FELT THAT THE SITUATION BECAME UNSAFE AT THE POINT THAT THEY DISCONTINUED THE APCH. I CLRED THE RWY AND APOLOGIZED ON THE RADIO FOR HAVING MADE THEM UNCOMFORTABLE AND CREATING AN INCONVENIENCE FOR THEM AS THEY FELT THEY HAD TO RE-ENTER THE PATTERN. THE PLT IN THE OTHER ACFT EXPRESSED HIS ANGST AT THE SITUATION VERBALLY OVER THE RADIO AND PROCEEDED TO CONTINUE PATTERN WORK. SUPPLEMENTAL INFO FROM ACN 700062: WHILE THE SYMPHONY 160 AND THE BE-200 WERE PARALLELING IN THE DOWNWIND LEGS FOR RWY 23 A DIALOG WAS MAINTAINED BTWN THE ACFT OF POS AND INTENTS. DUE TO MY UNFAMILIARITY OF THE COURSE RULES AT SHD; I QUESTIONED THE PF IF THE ARPT HAD A RESTR FOR L-HAND PATTERN ONLY VICE THE RECOMMENDED PATTERN SUGGESTED IN THE AIM. HE STATED IT DID NOT. I LATER RESEARCHED AND FOUND NO RESTR BUT FELT THAT A NUMBER OF 'OTHER' OPTIONS COULD HAVE BEEN TAKEN TO PREVENT THE SYMPHONY PLT FROM PERCEIVING AN UNSAFE CONDITION.

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.