Tower controller issued ML5 traffic pattern instructions to follow BA31 on wide base leg. ML5 turned base leg in front of the BA31, apparently inadvertently following a BE90 on short final, causing the BA31 to take an evasive maneuver away from the ML5.

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Attributes
ACN	388685
Time
Date	199712
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lrp airport : lns
State Reference	PA
Altitude	msl bound lower : 800 msl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lns
Operator	general aviation : personal
Make Model Name	M-5
Operating Under FAR Part	Part 91
Flight Phase	landing other other
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 121
Flight Phase	landing other other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller military : 4 controller non radar : 6 controller radar : 14 flight time total : 300
ASRS Report	388685
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 1500 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ML5 on downwind following a king air 1/2 mi final and a jetstream on wide right base. I told ML5 he was #3 following a jetstream on a wide right base. ML5 said he had jetstream in sight. I instructed him to follow the jetstream. ML5 then turned directly into the jetstream. Jetstream took evasive action. ML5 had wrong aircraft, but aircraft traffic were not close. King air was on short final, jetstream was a wide right base.

Original NASA ASRS Text

Title: TWR CTLR ISSUED ML5 TFC PATTERN INSTRUCTIONS TO FOLLOW BA31 ON WIDE BASE LEG. ML5 TURNED BASE LEG IN FRONT OF THE BA31, APPARENTLY INADVERTENTLY FOLLOWING A BE90 ON SHORT FINAL, CAUSING THE BA31 TO TAKE AN EVASIVE MANEUVER AWAY FROM THE ML5.

Narrative: ML5 ON DOWNWIND FOLLOWING A KING AIR 1/2 MI FINAL AND A JETSTREAM ON WIDE R BASE. I TOLD ML5 HE WAS #3 FOLLOWING A JETSTREAM ON A WIDE R BASE. ML5 SAID HE HAD JETSTREAM IN SIGHT. I INSTRUCTED HIM TO FOLLOW THE JETSTREAM. ML5 THEN TURNED DIRECTLY INTO THE JETSTREAM. JETSTREAM TOOK EVASIVE ACTION. ML5 HAD WRONG ACFT, BUT ACFT TFC WERE NOT CLOSE. KING AIR WAS ON SHORT FINAL, JETSTREAM WAS A WIDE R BASE.

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.