<< >> NASA ASRS Report 399106, April 1998

Pilot of a twin engine uga entered left base pattern instead of right, per tower clearance, and conflicted with reporter's large transport air carrier which required a slight turn to avoid the traffic.

Attributes
ACN	399106
Time
Date	199804
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tys
State Reference	TN
Altitude	agl bound lower : 700 agl bound upper : 700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : tys
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach other
Route In Use	arrival other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer pilot : private
Experience	flight time last 90 days : 75 flight time type : 105
ASRS Report	399106
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1500 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were cleared for a visual approach to runway 23L at tys. At approximately 700 ft AGL on final, we received a TA and looked up and saw a twin engine airplane turning base. The tower cleared him for a r-hand pattern and he flew a l-hand pattern. At the same time we noticed him, we took a right turn offsetting final until he flew past us in the opposite direction. It wasn't an abrupt turn because we had visual contact with him the whole time. We continued with a normal descent and landing once we were realigned with final.

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Original NASA ASRS Text

Title: PLT OF A TWIN ENG UGA ENTERED L BASE PATTERN INSTEAD OF R, PER TWR CLRNC, AND CONFLICTED WITH RPTR'S LGT ACR WHICH REQUIRED A SLIGHT TURN TO AVOID THE TFC.

Narrative: WE WERE CLRED FOR A VISUAL APCH TO RWY 23L AT TYS. AT APPROX 700 FT AGL ON FINAL, WE RECEIVED A TA AND LOOKED UP AND SAW A TWIN ENG AIRPLANE TURNING BASE. THE TWR CLRED HIM FOR A R-HAND PATTERN AND HE FLEW A L-HAND PATTERN. AT THE SAME TIME WE NOTICED HIM, WE TOOK A R TURN OFFSETTING FINAL UNTIL HE FLEW PAST US IN THE OPPOSITE DIRECTION. IT WASN'T AN ABRUPT TURN BECAUSE WE HAD VISUAL CONTACT WITH HIM THE WHOLE TIME. WE CONTINUED WITH A NORMAL DSCNT AND LNDG ONCE WE WERE REALIGNED WITH FINAL.

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.