A C336 pilot reports about the problems with an ATCT local controller's procedure of mixing fast and slow traffic in the pattern. The reporter cites an incident that occurred when he turned inside of another aircraft while in the pattern because of aircraft performance differences.

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Attributes
ACN	335342
Time
Date	199605
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bjc
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bjc
Operator	general aviation : personal
Make Model Name	Skymaster
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	None
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time total : 1500
ASRS Report	335342
Person 2
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Events
Anomaly	conflict : airborne less severe non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

With 2 parallel runways at bjc, one is used for landing practice for non-jet aircraft. I was flying a skymaster in the pattern with a single engine aircraft. After takeoff, having no instructions from the tower, I turned inside the aircraft in front, passing him. He was very concerned. Later that day with another aircraft (outside) the same problem occurred, that is: a lot of anxiety and radio calls by the single engine trainer. Possibly better call-outs and control by the tower would help. My minimum speed is probably higher than their cruise speed so I must pass them in the pattern or fly 2-3 mi legs (there are some airspace problems with that). I am concerned the trainers will take some evasive action that endangers them or me. Since this is not the first time this situation has occurred, it seems that the tower could put twins on a 'regular' runway or set a standard pattern (like 2 mi legs) for twins.

Original NASA ASRS Text

Title: A C336 PLT RPTS ABOUT THE PROBS WITH AN ATCT LCL CTLR'S PROC OF MIXING FAST AND SLOW TFC IN THE PATTERN. THE RPTR CITES AN INCIDENT THAT OCCURRED WHEN HE TURNED INSIDE OF ANOTHER ACFT WHILE IN THE PATTERN BECAUSE OF ACFT PERFORMANCE DIFFERENCES.

Narrative: WITH 2 PARALLEL RWYS AT BJC, ONE IS USED FOR LNDG PRACTICE FOR NON-JET ACFT. I WAS FLYING A SKYMASTER IN THE PATTERN WITH A SINGLE ENG ACFT. AFTER TKOF, HAVING NO INSTRUCTIONS FROM THE TWR, I TURNED INSIDE THE ACFT IN FRONT, PASSING HIM. HE WAS VERY CONCERNED. LATER THAT DAY WITH ANOTHER ACFT (OUTSIDE) THE SAME PROB OCCURRED, THAT IS: A LOT OF ANXIETY AND RADIO CALLS BY THE SINGLE ENG TRAINER. POSSIBLY BETTER CALL-OUTS AND CTL BY THE TWR WOULD HELP. MY MINIMUM SPD IS PROBABLY HIGHER THAN THEIR CRUISE SPD SO I MUST PASS THEM IN THE PATTERN OR FLY 2-3 MI LEGS (THERE ARE SOME AIRSPACE PROBS WITH THAT). I AM CONCERNED THE TRAINERS WILL TAKE SOME EVASIVE ACTION THAT ENDANGERS THEM OR ME. SINCE THIS IS NOT THE FIRST TIME THIS SIT HAS OCCURRED, IT SEEMS THAT THE TWR COULD PUT TWINS ON A 'REGULAR' RWY OR SET A STANDARD PATTERN (LIKE 2 MI LEGS) FOR TWINS.

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.